CN108169005A - A kind of anchor pole dynamic pull-out test device for the soil body - Google Patents

Abstract

The invention discloses a dynamic pull-out test device for anchor rods used in soil, which comprises a test box, an installation space with an open top is formed in the test box, a soil sample loading device is arranged in the installation space, and the soil sample loading device is arranged in the test box. A soil sample accommodating space is formed in the sample loading device, and a bolt dynamic pulling device for dynamically pulling the anchor rod and a monitoring device for monitoring are arranged above the soil sample loading device. The soil sample loading system of the present invention is suitable for soil bodies, and the soil sample loading device can still work normally when there is a relative displacement between the sliding loading plates, and the load is transmitted to the soil, so that the soil sample is in a predetermined stress state. The invention adopts the actuator to dynamically pull the anchor rod, and the loading mode can apply various dynamic and static loads to the anchor rod by inputting the load time history curve to the actuator. Cooperating with the sensors arranged in the system, it is used to study the anchoring performance and dynamic response of the anchor bolt in the soil under different stress states when it is dynamically pulled out.

Description

A dynamic pull-out test device for anchor rods used in soil

technical field

The invention belongs to the field of rock and soil anchoring engineering, and in particular relates to a dynamic pulling test device for anchor rods used in soil.

Background technique

As an economical and effective reinforcement method, bolt support is widely used in underground engineering, slope engineering, structural anti-floating engineering and deep foundation pit engineering. Soil anchoring relies on the shear strength of the anchor rod buried in the ground and the surrounding soil to transmit the tensile force of the structure or reinforce the ground itself to ensure the stability of the structure and soil. The successful anchoring of the bolt to the ground depends on the resistance of the ground to the pull-out of the bolt. The resistance is not only related to the type of soil, but also related to the stress state of the soil.

With the continuous expansion of the application range of anchor bolts, the influence of seismic effects and repeated loads on anchor bolts has also been proposed. The seismic stress suffered by anchor bolts when subjected to earthquake effects comes from the acceleration in the vertical direction. Changes when vibrating. The repeated load of the bolt mainly comes from temperature changes, tidal phenomena, wind pressure and wave load. Existing studies have shown that when the bolt bears repeated loads, it will cause additional displacement of the bolt, and the additional displacement of the bolt is affected by the amplitude of the load. It is unreasonable to only consider the traditional design of static load when the anchor rod bears repeated load. Therefore, under the action of dynamic load, the anchorage performance and dynamic response of anchor bolts anchored in soils with different stress states have important research value.

Whether it is to study the anchoring performance or dynamic response of anchor bolts under different stress states, in-situ testing and model testing are the most direct and effective means. However, in-situ tests are often limited by environmental conditions and affected by various unstable factors, making it difficult to carry out. Compared with in-situ tests, indoor model tests are more controllable and less affected by external interference, which is conducive to discovering laws. The model tests for the anchorage performance and dynamic response of anchor bolts anchored in soils with different stress states under dynamic loads are very limited, and the existing test devices cannot simulate the actual situation well.

The difficulties in carrying out the model test of the anchorage performance and dynamic response of anchor bolts in different stress states of soil under dynamic loading are: 1. Load the soil to keep the soil in a predetermined stress state; 2. Dynamically pull the anchor. In order to solve problem 1, the publication number is CN103698215A, and the publication date is the Chinese patent anchor cable pulling test device on April 02, 2014. The preloading device is used to pressurize the soil, but the device exerts two forces on the soil. The magnitude of the principal stress is the same, which is inconsistent with the actual situation. The publication number is CN103398901A, and the publication date is November 20, 2013. The Chinese patent is an indoor pull-out test device for anchor rods. The sample is loaded by a jack, so that the principal stress of the sample can be different, depending on the elastic modulus of the soil. The rock is relatively small, and the soil sample will be greatly compressed when the device applies a load to the soil sample. The loading device is difficult to work normally, and the device is difficult to apply to the soil. In order to solve the problem 2, the Chinese Patent Anchoring Body Dynamic Tensile Experimental Device and Experimental Method with Publication No. 105510158A and Publication Date of April 20, 2016 uses a heavy hammer-lever device to convert and amplify the impact load of the free fall of the heavy hammer For the impact load on the anchor rod, but the device can only apply the impact load to the anchor rod, and there are many inconveniences when applying repeated loads.

Contents of the invention

The present invention is proposed to solve the problems existing in the prior art, and its purpose is to provide a dynamic pull-out test device for anchor rods used in soil.

The technical solution of the present invention is: a dynamic pull-out test device for anchor rods used in soil, including a test box, an installation space with an open top is formed in the test box, and a soil sample loading device is arranged in the installation space, A soil sample accommodating space is formed in the soil sample loading device, and an anchor dynamic pulling device for dynamically pulling the anchor rod and a monitoring device for monitoring are arranged above the soil sample loading device.

The test box includes a base, the upper end of the base is provided with a counter force device for assembling a jack, an active groove guiding the soil sample loading device is formed in the base, a circular through hole is formed in the upper end of the base, and the circular through hole A sleeve fixing device is arranged in the center, the circular through hole is smaller than the sleeve fixing device, the diameter of the circular through hole is slightly larger than the test anchor rod, and the diameter of the sleeve fixing device is larger than the diameter of the circular through hole.

The counter force device encloses and forms an installation space, the circular through hole is located in the installation space, the sleeve fixing device is a cylinder with a buckle formed on the top, a sleeve is arranged on the upper end of the cylinder, and the sleeve The inner diameter of the barrel is the embedding hole of the test anchor rod.

The soil sample loading device includes a jack arranged inside the reaction force device, a sliding loading plate and a sleeve driven by the jack.

The sliding loading plate includes a loading plate base, the upper end of the loading plate base is provided with a loading plate, the driving side of the loading plate is provided with a sliding plate and a roller that slides laterally along the loading plate, and the end surface of the sliding plate is formed to be in contact with the jack. The telescopic end fixing groove of the telescopic end is fixed, and the lower end of the loading plate base is provided with a universal wheel placed in the movable groove.

One side of the loading plate and the base of the loading plate is provided with a slider A, the pressurized side of the loading plate forms a linear slide rail A, and the base of the loading plate is provided with a soil retaining cover to protect the slider A ,

A soil retaining strip is arranged at the lower edge of the loading plate.

The anchor rod dynamic drawing device includes a supporting plate, the upper end of the supporting plate is provided with a fixed pulley, an actuator, and a fixed bracket, and the driving end of the actuator is connected with a load transfer plate sliding along the fixed bracket, A steel cable is arranged in the load transfer plate, the steel cable is placed in the axial groove of the fixed pulley, and the free end of the steel cable is connected with the test anchor rod through the anchor rod clamp.

Slider B is formed on both sides of the load transfer plate, a linear slide rail B is formed at the fixed bracket, a groove that engages with the linear slide rail B is formed on the outside of the slider B, and an anti-falling protrusion is formed on the inner wall of the groove From the above, the load transfer plate is provided with a steel cable fixer for fixing the steel cables.

The upper end of the base is provided with a steel pipe column, the supporting plate is fixed on the steel pipe column, and the upper end of the base is also provided with an angle steel support for fixing the reaction force device.

The monitoring device includes a displacement sensor arranged on the bolt fixture, an acceleration sensor placed on the exposed part of the test bolt, a strain gauge arranged along the shaft of the test bolt, and a load sensor arranged on the telescopic end of the jack.

The invention solves the problem that it is difficult for the existing anchor pullout test device to apply loads to the soil so that it is in a predetermined stress state, and has a dynamic pullout device for anchor rods, which is used to study anchors in soils in different stress states. Anchorage performance and dynamic response of a rod during dynamic pullout.

The soil sample loading system of the present invention is suitable for soil. The elastic modulus of the soil is smaller than that of the rock, and the compression amount is relatively large when subjected to load. At this time, the relative displacement occurs between the sliding loading plates, and the soil sample loading device can still work normally. Work, transfer the load to the soil, so that the soil sample is in a predetermined stress state.

The invention adopts the actuator to dynamically pull the bolt, which solves the problem that the previous bolt pulling test device can only apply linear pulling force or impact load to the bolt. This loading method can apply various dynamic and static loads to the anchor rod by inputting the load time history curve to the actuator. Cooperating with the sensors arranged in the system, it is used to study the anchoring performance and dynamic response of the anchor bolt in the soil under different stress states when it is dynamically pulled out.

Description of drawings

Fig. 1 is the overall structural representation of the present invention;

Fig. 2 is the schematic diagram of test box among the present invention;

Fig. 3 is the schematic diagram of soil sample loading device in the present invention;

Fig. 4 is the schematic diagram of anchor rod dynamic drawing device among the present invention;

Figure 5 is a front perspective view of a sliding loading plate in the present invention;

Figure 6 is a rear perspective view of a sliding loading plate in the present invention;

Fig. 7 is the schematic diagram of load transfer plate among the present invention;

Fig. 8 is the schematic diagram of testing anchor rod among the present invention;

Fig. 9 is a schematic diagram of a soil sample loading device in the present invention;

in:

1 test chamber 1-1 base

1-2 Reaction device 1-3 Activity slot

1-4 Circular Through Hole 1-5 Socket Fixture

1-6 Angle steel support 1-7 Steel pipe column

2 Soil sample loading device 2-1 Jack

2-2 Sliding Load Plate 2-2-1 Load Plate Base

2-2-2 Load Plate 2-2-3 Slide Plate

2-2-4 Roller 2-2-5 Telescoping End Fixing Slot

2-2-6 Universal Wheel 2-2-7 Soil Retaining Cover

2-2-8 Soil retaining strip 2-2-9 Slider A

2-2-10 Linear Slide A 2-3 Sleeve

3 Anchor rod dynamic pulling device 3-1 Anchor rod clamp

3-2 Steel cable 3-3 Fixed pulley

3-4 Actuator 3-5 Support plate

3-6 Load transfer plate 3-7 Fixing bracket

3-8 Linear slide rail B 3-9 Slide block B

3-10 Cable Retainer 4 Monitoring Device

4-1 Displacement sensor 4-2 Acceleration sensor

4-3 Strain gauge 4-4 Load cell

5 Test anchor 6 Soil sample

7 Binder.

Detailed ways

Below, the present invention is described in detail with reference to accompanying drawing and embodiment:

As shown in Figures 1 to 9, a dynamic pull-out test device for soil anchors includes a test box 1, an installation space with an open top is formed in the test box 1, and soil samples are arranged in the installation space. A loading device 2, wherein a soil sample accommodation space is formed in the soil sample loading device 2, and a bolt dynamic pulling device 3 for dynamically pulling the bolt and a monitoring device 4 for monitoring are arranged above the soil sample loading device 2.

The test box 1 includes a base 1-1, the upper end of the base 1-1 is provided with a counter force device 1-2 for assembling a jack 2-1, and an active groove guiding the soil sample loading device 2 is formed in the base 1-1 1-3, the upper end of the base 1-1 forms a circular through hole 1-4, and a sleeve fixing device 1-5 is arranged in the circular through hole 1-4, and the circular through hole 1-4 is smaller than In the sleeve fixing device 1-5, the diameter of the circular through hole 1-4 is slightly larger than the test anchor rod 5, and the diameter of the sleeve fixing device 1-5 is larger than the diameter of the circular through hole 1-4.

The reaction force device 1-2 encloses and forms an installation space, the circular through hole 1-4 is located in the installation space, and the sleeve fixing device 1-5 is a cylinder with a buckle formed on the top, and the cylinder The upper end is provided with a sleeve 2-3, and the inner diameter of the sleeve 2-3 is the embedding hole of the test anchor rod 5.

The soil sample loading device 2 includes a jack 2-1 arranged inside the reaction force device 1-2, a sliding loading plate 2-2 driven by the jack 2-1 and a sleeve 2-3.

The sliding loading plate 2-2 includes a loading plate base 2-2-1, the upper end of the loading plate base 2-2-1 is provided with a loading plate 2-2-2, and the loading plate 2-2-2 The driving side is provided with a sliding plate 2-2-3 and a roller 2-2-4 that slide laterally along the loading plate 2-2-2, and the end surface of the sliding plate 2-2-3 forms a joint with the telescopic end of the jack 2-1. The fixed telescopic end fixes the groove 2-2-5, and the lower end of the loading plate base 2-2-1 is provided with a universal wheel 2-2-6 placed in the movable groove 1-3.

One side of the loading plate 2-2-2 and the loading plate base 2-2-1 is provided with a slider A2-2-9, and the pressure side of the loading plate 2-2-2 forms a linear slide rail A2 -2-10, the loading plate base 2-2-1 is provided with a soil retaining cover 2-2-7 to protect its slider A2-2-9, the lower edge of the loading plate 2-2-2 A soil retaining strip 2-2-8 is provided.

The bolt dynamic drawing device 3 includes a support plate 3-5, the upper end of the support plate 3-5 is provided with a fixed pulley 3-3, an actuator 3-4, and a fixed bracket 3-7. The driving end of the actuator 3-4 is connected with the load transfer plate 3-6 sliding along the fixed bracket 3-7, the load transfer plate 3-6 is provided with a steel cable 3-2, and the steel cable 3-2 is placed In the axial groove of the fixed pulley 3-3, the free end of the steel cable 3-2 is connected with the test anchor 5 through the anchor clamp 3-1.

Sliders B3-9 are formed on both sides of the load transfer plate 3-6, a linear slide rail B3-8 is formed at the fixed bracket 3-7, and the outer side of the slide block B3-9 is formed to engage the linear slide rail B3-8. A groove, an anti-loosening protrusion is formed on the inner wall of the groove, and a wire rope fixer 3-10 for fixing the wire rope 3-2 is arranged in the load transfer plate 3-6.

The upper end of the base 1-1 is provided with a steel pipe column 1-7, the supporting plate 3-5 is fixed on the steel pipe column 1-7, and the upper end of the base 1-1 is also provided with a fixed reaction force device 1-2. Angle steel supports 1-6.

The monitoring device 4 includes a displacement sensor 4-1 arranged on the anchor clamp 3-1, an acceleration sensor 4-2 placed on the exposed part of the test anchor 5, a strain gauge 4-3 arranged along the shaft of the test anchor 5, A load cell 4-4 arranged on the telescopic end of the jack 2-1.

There are four sliding loading plates 2-2 in the present invention, and the end face of the sliding loading plate 2-2 bears against the side wall of the next sliding loading plate 2-2 in the counterclockwise direction.

An indoor dynamic drawing system for anchors suitable for soil consists of a test box 1, a soil loading device 2, a dynamic drawing device 3 for anchors, and a monitoring device 4.

The test box 1 is composed of a base 1-1, a reaction force device 1-2, an anchor fixing device 1-4, a sleeve fixing device 1-5, an angle steel support 1-6, and a steel pipe column 1-7.

The soil loading device 2 is composed of four sliding loading plates 2-2, a jack 2-1, and a sleeve 2-3.

The anchor rod dynamic drawing system 3 includes an anchor rod clamp 3-1, a steel cable 3-2, a fixed pulley 3-3, an actuator 3-4, a load transfer plate 3-6, a fixed bracket 3-7, a straight line Slide rail B3-8, slide block B3-9, steel cable fixer 3-10 form.

The monitoring device 4 includes a displacement sensor 4-1, an acceleration sensor 4-2, a strain gauge 4-3, and a load sensor 4-4.

The belt base 1-1 has a card slot for fixing the reaction force device 1-2, and the upper part of the base 1-1 has a movable slot 1-3, within a certain range, the sliding loading plate 2-2 can be used on the base 1-1. 1 to move freely in the horizontal direction. The circular through hole 1-4 is located in the center of the area surrounded by the movable groove 1-3, and is used for positioning the test anchor rod 5 during the test.

The sleeve fixing device 1-5 is a cylinder fixed on the base 1-1, and the cylinder has buckles connected with the sleeve 2-3. The function of the sleeve 2-3 is to pre-fill the soil sample 6. Reserve the test bolt 5 embedding hole, and remove it after soil sample 6 is filled. In order to avoid shear failure of soil sample 6 when the sleeve 2-3 is removed, lubricant should be applied to the sleeve to reduce contact with soil. Friction force between samples 6.

The reaction force device 1-2 is made of a steel plate, and the rear fixed angle steel support 1-6 provides a reaction force for the steel plate when loaded, and holes are reserved on the steel plate for fixing the jack 2-1.

The steel pipe columns 1-7 pass through the base and are anchored to the ground for fixing the dynamic pulling device 3 for anchor rods.

The jacks 2-1 are fixed on the reaction force device 1-2 by bolts, a total of four jacks 2-1 are divided into two groups according to the direction of load application, and two-direction principal stress is applied to the soil sample 6, and each group of jacks 2-1 Different loads can be applied to make the principal stress of the soil sample 6 different. The jack 2-1 is a servo jack, which can precisely control the applied thrust. The telescopic end of the jack 2-1 is equipped with a load sensor 4-4. -1 applied load.

The sliding loading plate 2-2 is composed of a loading plate base 2-2-1, a loading plate 2-2-2, a slider A2-2-9, a linear slide rail A2-2-10, and a soil retaining cover 2-2 -7, soil retaining strip 2-2-8 constitutes. The loading plate 2-2-2 is fixed on the loading plate base 2-2-1, and the lower part of the loading plate base 2-2-1 has universal wheels 2-2-6, which can slide the loading plate 2-2 in the movable groove 1-3 can move freely, the size of the loading plate base 2-2-1 is suitable for the edge to just withstand the reaction device 1-2, which can ensure the stability of the four sliding loading plates 2-2 placed on the base 1-1 .

The loading plate 2-2 uses the structure of the sliding plate 2-2-3 and the roller 2-2-4 to transmit thrust, the jack 2-1 is connected with the sliding plate 2-2-3, and the load is transmitted to the rear roller through the sliding plate 2-2-4, and then transferred to the loading plate 2-2-2, the sliding plate 2-2-3 has a telescopic end fixing groove 2-2-5, which is used to connect with the telescopic end of the jack 2-1 , the roller 2-2-4 is fixed on the loading plate 2-2-2, and can have a tangential displacement with the sliding plate 2-2-3, and transmits the load of the jack 2-1 to the loading plate 2-2- 2.

The slider A2-2-9 is fixed on the upper and lower sides of the loading plate 2-2-2. The slider can move the loading plate 2-2-2 to each other on the one hand, and transmit the force to the other side on the other hand. A loading plate 2-2-2 for sliding the loading plate 2-2 to move within the base 1-1. The linear slide rail A2-2-10 can be used for the side slide block A2-2-9 of the loading plate to slide, the upper linear slide rail A2-2-10 does not need protection, and the lower linear slide rail A2-2-10 is covered by soil retaining cover 2 -2-7 protection. The soil retaining cover 2-2-7 is located adjacent to the loading plate, covering the lower linear slide rail A2-2-10, and there are soil retaining strips 2-2-8 on the edge, which are used to close the track and prevent soil Sample 6 enters the linear slide rail A2-2-10, affecting its normal operation.

The soil retaining strip 2-2-8 is located at the lower edge of the loading plate base 2-2-1 and the edge of the soil retaining cover 2-7, and the soil retaining strip 2-2-8 at the lower edge of the loading plate base 2-2-7 just contacts The base prevents the soil sample 6 from entering the movable groove 1-3, which affects the movement of the universal wheel 2-2-6, and the soil retaining strip 2-2-8 has a certain flexibility and can move in a small range.

The anchor clamp 3-1 is made of metal, one section clamps the exposed end of the test anchor 5, and one end is connected to the steel cable 3-2. The steel cable 3-2 is subject to axial tension and has the characteristics of small tensile deformation and high strength.

The supporting plate 3-5 is fixed on the steel pipe column 1-7, the height of the supporting plate 3-5 can be adjusted according to the exposed length of the test anchor rod 5, and the fixed pulley 3-3 is arranged on the supporting plate 3-5. Actuator 3-4, load transfer plate 3-6, fixed support 3-7.

The fixed pulley 3-3 is fixed on the side of the supporting plate 3-5 close to the test anchor rod 7, the steel cable 3-2 crosses the fixed pulley 3-3, and the fixed pulley 3-3 is used to transfer the load to the plate 3-6. The transmitted horizontal load is transformed into a pull-out force acting on the test anchor 5.

The actuator 3-4 is fixed to the supporting plate 3-5 by bolts, the loading rod of the actuator 3-4 is connected with the load transfer plate 3-6, and the edge of the load transfer plate 3-6 is fixed with a slider B3 -9, connected with the linear slide rail B3-8 on the fixed support 3-7, the load transfer plate 3-6 can move horizontally through the slider-linear slide rail structure, and the steel cable fixer 3-10 connects the steel cable 3- 2 is fixed on the load transfer plate 3-6, and the main function of the load transfer plate 3-6 is to transfer the dynamic load applied by the actuator 3-4 to the steel cable 3-2.

The working principle of the present invention is as follows:

In order to study the anchoring performance and dynamic response of the anchor bolt in the soil under different stress states during dynamic pullout, the present invention uses a servo jack 2-1 to load the soil sample 6. In order to solve the strong compressibility of the soil, the traditional anchorage pullout test The pressurization method of the system cannot be better applied to the problem of soil. The present invention adopts a sliding loading plate 2-2, and the sliding loading plate 2-2 is transmitted through the sliding plate and roller structure and the universal wheel 2-2-6. The horizontal thrust can move on the base 1-1 at the same time, and the sliding loading plate 2-2 can move with each other, even if the compression of the soil sample 6 is relatively large, the soil sample loading system 2 can also work normally, loading the soil sample to A given state of stress.

Cooperate with Figure 9 to illustrate how the soil sample loading device loads the highly compressible soil. Four jacks 2-1 apply loads at the same time, and soil sample 6 produces compression deformation. Take the sliding loading plate 2-2 on the left as an example Describe the movement path of the sliding loading plate when the soil sample is compressed. The sliding loading plate 2-2 is subjected to the x-direction load transmitted by the jack 2-1 and the y-direction load transmitted from the rear sliding loading plate 2-2. Under the combined force, the left sliding loading plate 2 -2 moves in the active slot 1-3 through universal wheels. The sliding plate 2-2-3 directly bears the load transmitted by the jack 2-1, and due to the constraint of the fixed groove 2-2-5 at the telescopic end, only the displacement in the x direction occurs. Other structures on the sliding loading plate 2-2 on the left Displacement in the y direction is generated, and this structure can ensure that even if the compression deformation of the soil sample 6 causes the sliding loading plate 2-2 on the left to move in the movable groove 1-3, the jack 2-1 can still pass the load through the sliding loading plate 2- 2 is transferred to soil sample 6.

The actuator 3-4 directly transfers the dynamic load to the dynamic load transfer plate 3-6, and the steel cable 3-2 is fixed to the load transfer plate 3-6. At this time, the dynamic load applied by the actuator 3-4 is transferred to the steel Cable 3-2, the other end of the steel cable is connected to the anchor rod 3-2 fixture, at this time the dynamic load is transmitted to the test anchor rod 5 by the actuator 3-4; the load transfer plate 3-6 passes through the fixed bracket 3-7 The linear slide rail 3-8-slider 3-9 is connected, the actuator 3-4 will extend the telescopic end of the jack when the load is applied, and the actuator 3-4 will directly transfer the dynamic load to the dynamic load transfer plate 3-6 , at this time the load transfer plate 3-6 can slide on the fixed bracket 3-7, the steel cable 3-2 is fixed on the load transfer plate 3-6, at this time the dynamic load applied by the actuator 3-4 is transmitted to the steel cable 3 -2, the anchor clamp 3-1 is connected to the other end of the steel cable, at this time, the dynamic load applied by the actuator 3-4 is converted into dynamic pulling of the test anchor 5.

The dynamic load type of the test anchor 5 can be changed by inputting different load-time history curves, which solves the problem that the previous anchor pullout test system can only apply linear tension or impact load to the anchor and it is difficult to apply cyclic load to the anchor .

Test process of the present invention is as follows:

The base 1-1 of the test box is anchored to the ground, the counter force transposer 1-2 is assembled and fixed on the base 1-1, and the steel pipe column 1-7 is fixed on the ground through the holes in the base. Place the sliding loading plate 2-2 on the base 1-1, snap the sleeve 2-3 to the sleeve fixing device 1-5, apply lubricant to the outer wall of the sleeve 2-3 and the inner wall of the sliding loading plate 2-2, To reduce the friction between the soil body and the sleeve 2-3 and the sliding loading plate 2-2. Fill the first layer of soil samples, compact the soil samples to the specified density, and fill the next layer of soil after scraping the surface until the specified height is filled. The filling height of soil sample 6 should be lower than the upper linear slide rail A2 -2-10.

Arrange the strain gauge 4-3 along the shaft of the test anchor 5, and perform waterproof treatment on it, remove the sleeve 2-3, place the test anchor 5 in the circular through hole 1-4, pour the cement 7, and maintain it until Specifies the intensity. The exposed part of the anchor rod 5 is placed with an acceleration sensor 4-2.

The jack 2-1 applies a load so that the soil sample 6 is in a predetermined stress state, and at the same time reads data from the load sensor 4-4 to monitor the load applied by the jack 2-1.

Fix the supporting plate 3-5 on the steel pipe column 1-7 at a suitable height, place the fixed pulley 3-3, the actuator 3-4, the load transfer plate 3-6, the fixed bracket 3-7, and the steel cable 3-2 Across the fixed pulley 3-3 and connect with the load transfer plate 3-6.

Clamp the end of the test anchor 5 with the anchor clamp 3-1, and arrange the displacement sensor 4-1 on the anchor clamp 3-1. Turn on the actuator 3-4, and input the load time history function to the actuator, for example, input a periodic load to study the influence of the number of load cycles and load amplitude on the displacement of the anchor rod. At this time, it is necessary to read the data of the displacement sensor 4-1 , by changing the load cycle and load amplitude output cycle-displacement curve and amplitude-displacement curve, the strain distribution along the length of the bolt under cyclic loading can also be studied.

The invention solves the problem that it is difficult for the existing anchor pullout test device to apply loads to the soil so that it is in a predetermined stress state, and has a dynamic pullout device for anchor rods, which is used to study anchors in soils in different stress states. Anchorage performance and dynamic response of a rod during dynamic pullout.

The soil sample loading system of the present invention is suitable for soil. The elastic modulus of the soil is smaller than that of the rock, and the compression amount is relatively large when subjected to load. At this time, the relative displacement occurs between the sliding loading plates, and the soil sample loading device can still work normally. Work, transfer the load to the soil, so that the soil sample is in a predetermined stress state.

The invention adopts the actuator to dynamically pull the bolt, which solves the problem that the previous bolt pulling test device can only apply linear pulling force or impact load to the bolt. This loading method can apply various dynamic and static loads to the anchor rod by inputting the load time history curve to the actuator. Cooperating with the sensors arranged in the system, it is used to study the anchoring performance and dynamic response of the anchor bolt in the soil under different stress states when it is dynamically pulled out.

Claims (10)

1. a kind of anchor pole dynamic pull-out test device for the soil body, including chamber（1）, it is characterised in that：The chamber （1）Open installation space at the top of middle formation is provided with soil sample loading device in the installation space（2）, the soil sample loading Device（2）Middle formation soil sample accommodation space, the soil sample loading device（2）Top, which is provided with, moves the anchor pole of anchor pole dynamic drawing State draw-off gear（3）With the monitoring device of monitoring（4）.

2. a kind of anchor pole dynamic pull-out test device for the soil body according to claim 1, it is characterised in that：The examination Tryoff（1）Including pedestal（1-1）, the pedestal（1-1）Upper end is provided with assembling jack（2-1）Counterforce device（1-2）, institute State pedestal（1-1）Middle formed is oriented to soil sample loading device（2）Loose slot（1-3）, the pedestal（1-1）Upper end forms round logical Hole（1-4）, the circular through hole（1-4）In be provided with sleeve barrel fixing device（1-5）, the circular through hole（1-4）Less than sleeve Fixing device（1-5）, circular through hole（1-4）Diameter slightly larger than test anchor pole（5）, the sleeve barrel fixing device（1-5）Diameter More than circular through hole（1-4）Diameter.

3. a kind of anchor pole dynamic pull-out test device for the soil body according to claim 2, it is characterised in that：It is described anti- Power apparatus（1-2）It is enclosed installation space, the circular through hole（1-4）In installation space, the sleeve barrel fixing device （1-5）The cylinder of buckle is formed for top, the cylinder upper end is provided with sleeve（2-3）, the sleeve（2-3）Internal diameter is test Anchor pole（5）Embedded hole.

4. a kind of anchor pole dynamic pull-out test device for the soil body according to claim 3, it is characterised in that：The soil Sample loading device（2）Including being arranged on counterforce device（1-2）The jack of inside（2-1）, by jack（2-1）The slip of driving Formula load plate（2-2）And sleeve（2-3）.

5. a kind of anchor pole dynamic pull-out test device for the soil body according to claim 4, it is characterised in that：The cunning Dynamic formula load plate（2-2）Including load plate pedestal（2-2-1）, the load plate pedestal（2-2-1）Upper end is provided with load plate（2- 2-2）, the load plate（2-2-2）Driving side be provided with along load plate（2-2-2）The sliding panel slid laterally（2-2-3）With Roller（2-2-4）, the sliding panel（2-2-3）End face is formed and jack（2-1）The mutually fixed telescopic end of telescopic end fix Slot（2-2-5）, the load plate pedestal（2-2-1）Lower end, which is provided with, is placed on loose slot（1-3）In universal wheel（2-2-6）.

6. a kind of anchor pole dynamic pull-out test device for the soil body according to claim 5, it is characterised in that：It is described to add Support plate（2-2-2）, load plate pedestal（2-2-1）Side be both provided with sliding block A（2-2-9）, the load plate（2-2-2）Plus Side is pressed to form line slide rail A（2-2-10）,

The load plate pedestal（2-2-1）On be provided with and protect its sliding block A（2-2-9）Earth-retaining lid（2-2-7）,

The load plate（2-2-2）Earth-retaining item is provided at lower edge（2-2-8）.

7. a kind of anchor pole dynamic pull-out test device for the soil body according to claim 6, it is characterised in that：The anchor Bar dynamic draw-off gear（3）Including supporting plate（3-5）, the supporting plate（3-5）Upper end is provided with fixed pulley（3-3）, actuator （3-4）, fixing bracket（3-7）, the actuator（3-4）Driving end with along fixing bracket（3-7）The load transmitting plate of slip （3-6）It is connected, the load transmitting plate（3-6）In be provided with cable wire（3-2）, the cable wire（3-2）It is placed in fixed pulley（3-3）'s In axial groove, the cable wire（3-2）Free end passes through anchor pole fixture（3-1）With testing anchor pole（5）It is connected.

8. a kind of anchor pole dynamic pull-out test device for the soil body according to claim 7, it is characterised in that：The lotus Carry transmission plate（3-6）Both sides form slide block B（3-9）, the fixing bracket（3-7）Place forms line slide rail B（3-8）, the cunning Block B（3-9）Outside forms occlusion line slide rail B（3-8）Groove, anticreep protrusion, the lotus are formed at the groove madial wall Carry transmission plate（3-6）In be provided with fixing tightwire（3-2）Cable wire fixator（3-10）.

9. a kind of anchor pole dynamic pull-out test device for the soil body according to claim 8, it is characterised in that：The bottom Seat（1-1）Upper end is provided with steel pipe post（1-7）, the supporting plate（3-5）It is fixed on steel pipe post（1-7）On, the pedestal （1-1）Upper end is additionally provided with fixed counterforce device（1-2）Angle steel support（1-6）.

10. a kind of anchor pole dynamic pull-out test device for the soil body according to claim 9, it is characterised in that：It is described Monitoring device（4）Including being arranged on anchor pole fixture（3-1）On displacement sensor（4-1）, test anchor pole（5）Exposed parts are placed Acceleration transducer（4-2）, along test anchor pole（5）Shaft arranges foil gauge（4-3）, jack（2-1）It is laid on telescopic end Load sensor（4-4）.