CN207096051U - Test device for measuring water absorption of stacking materials under different pressure conditions - Google Patents

Abstract

A test device for measuring the water absorption of rockfill materials under different pressure conditions. The test device includes an outer tank, an inner tank, an external air source and an automatic pressure difference measurement device. The inner tank is set inside the outer tank. The inner tank includes inner tank wall, inner tank pull rod, inner tank inlet and outlet, connecting hole, measuring tube, inner tank cover and base, and the described pressure difference automatic measuring device includes micro pressure sensor, data acquisition, inner and outer tank connecting pipe The road, the outer tank sensor and the inner tank sensor are characterized in that a connection hole is arranged in the middle of the inner tank cover, and the measuring tube is sealed in the connection hole, and the outer tank sensor is arranged between the outer tank and the inner tank. The inner tank sensor is arranged inside the inner tank. The utility model has simple and reasonable structure, convenient operation, realizes the measurement of water absorption of rockfill materials under different pressures, has high detection efficiency and detection accuracy, and can be popularized in related fields.

Description

A test device for measuring water absorption of rockfill materials under different pressure conditions

technical field

The utility model relates to the technical field of water absorption test devices, in particular to a test device for measuring the water absorption of rockfill materials under different pressures.

Background technique

In recent years, the large-scale construction of earth-rockfill dams in my country has put forward higher and higher requirements for the mechanical properties of rock-fill materials. Among the many tests to study its properties, the saturation of rock-fill material samples is an important condition for the test to be carried out. If The sample saturation is not high, and even the rockfill material particles are still saturated with water during the test loading process, which will inevitably affect the test results. For example, in a triaxial test, the volumetric deformation of the sample is generally determined by measuring the displacement of the sample. If the sample particles are not fully saturated, the sample particles will continue to absorb water during the test shearing process, which will affect the accuracy of the volume variable measurement. .

In addition, for the rockfill material filled in the dam body, in addition to the atmospheric pressure, it also needs to bear the pressure generated by the upper water. For example, when the water level is 100m, the corresponding water pressure is 1MPa. At this time, due to the existence of water pressure, the small through-cracks in the rockfill and the channels formed by the chemical reaction between the chemical substances in the rockfill and water will inevitably absorb water. Therefore, it is necessary to analyze the water absorption of rockfill materials under different pressures. Quantity is measured.

Rockfill material has relatively large particles, and it takes a long time to absorb water and saturate it. However, how long it takes to be basically saturated and meet the test accuracy requirements has not been clearly stipulated so far, and there is no clear detection method. In the article "Experimental Research on Immersion and Saturation Time of Coarse-grained Soil" published in "Journal of Chongqing Jiaotong University (Natural Science Edition)" Volume 35, Issue 1 in February 2016, Zhu Jungao provided a method for measuring rockfill materials under normal pressure. A device for water absorption, but the reading of this device needs to be read manually. Since the water absorption of rockfill materials changes slowly with time, long-term manual reading will reduce the detection efficiency and accuracy. Furthermore, this device can only be used to measure the water absorption of rockfill materials under normal pressure, and cannot measure the water absorption of rockfill materials under specific pressure conditions.

In order to solve the above problems, the utility model is hereby proposed.

Contents of the invention

The purpose of the utility model is to provide a test device for measuring the water absorption of rockfill materials under different pressures.

In order to achieve these goals, the following technical solutions are adopted:

The purpose of this utility model is to provide a test device for measuring the water absorption of rockfill materials under different pressures. The test device includes an outer tank, an inner tank, an external air source and an automatic differential pressure measurement device. The tank is set inside the outer tank, the inner tank includes the inner tank wall, the inner tank pull rod, the inner tank inlet and outlet, the connection hole, the measuring tube, the inner tank cover and the base, and the pressure difference automatic measuring device includes a micro pressure sensor, Data collection, connecting pipelines of inner and outer tanks, outer tank sensor and inner tank sensor, characterized in that a connecting hole is arranged in the middle of the inner tank cover, and the connecting hole is sealed and connected with a measuring tube, and the outer tank sensor is arranged between the outer tank and the inner tank cover. Between the inner tanks, the inner tank sensor is arranged inside the inner tank.

Preferably, the outer tank includes an outer tank wall, an outer tank pull rod, an outer tank water source interface, an outer tank suspension ring, an outer tank cover, an outer tank drain port and an outer tank pressure sensor, and the outer tank and the inner tank share a base.

Preferably, the inner tank cover is located on the upper side of the inner tank wall, the base is located on the lower side of the inner tank wall, and the inner tank wall is sealed with the inner tank cover and the base respectively, and the inner tank wall is connected to the inner tank wall through the inner tank pull rod. The base is fixedly connected, and the inlet and outlet of the inner tank are arranged on the base and can communicate with the inner tank and the external water source through holes.

Preferably, the outer tank cover is located at the upper end of the outer tank wall, and the base is located at the lower end of the outer tank wall, and the outer tank wall is respectively sealed and connected with the outer tank cover and the base, and the outer tank wall is fixed to the base through the outer tank pull rod The outer tank cover is provided with an outer tank water source interface and an outer tank pressure sensor.

Preferably, the external air source sequentially includes an air source interface, an air source connection pipeline, a pressure regulating valve and an air storage tank, and the air source interface is arranged on the upper part of the outer tank.

Preferably, the outer tank wall is a cylindrical structure with a hollow interior and openings at both ends, and the material of the outer tank wall is plexiglass.

Preferably, the inner tank wall is a cylindrical structure with a hollow interior and openings at both ends, the outer diameter of which is smaller than the inner diameter of the outer tank, and the material of the inner tank wall and measuring tube is plexiglass.

Preferably, switch valves are provided at the inlet and outlet of the inner tank, the water source interface of the outer tank, the outlet of the outer tank and the air source interface.

Beneficial technical effects:

The utility model provides a test device for measuring the water absorption of rockfill materials under different pressures. The water absorption of rockfill materials in the test process is recorded through the measuring tube arranged on the inner tank cover. To meet different test pressure requirements, and use the pressure difference automatic measurement device to convert the change of water level in the measuring tube into the change of pressure difference. Through the measurement and recording of pressure difference, different time and different pressure of rockfill materials can be realized. Measurement of water absorption.

The utility model has simple and reasonable structure, convenient operation, realizes the measurement of water absorption of rockfill materials under different pressures, has high detection efficiency and detection accuracy, and can be popularized in related fields.

Description of drawings

Fig. 1 is a schematic side view of the utility model.

Fig. 2 is a schematic top view of the utility model.

Explanation of reference signs:

In order to further clearly illustrate the structure of the utility model and the connection relationship between the components, the following reference signs are given and explained.

Outer tank 1, outer tank wall 101, outer tank pull rod 102, outer tank water source interface 103, outer tank lifting ring 104, outer tank cover 105, base 106, outer tank drain port 107, outer tank pressure sensor 108, external air source 2, Air source interface 201, air source connecting pipeline 202, pressure regulating valve 203, gas storage tank 204, inner tank 3, inner tank wall 301, inner tank tie rod 302, inner tank inlet and outlet 303, measuring tube 304, connection hole 305 , Inner tank cover 306, differential pressure automatic measuring device 4, micro-pressure differential sensor 401, data acquisition 402, inner and outer tank connecting pipeline 403, outer tank sensor 404, inner tank sensor 405.

Through the description of the above reference numerals, in combination with the embodiments of the present utility model, it can be more clearly

Understand and explain the technical solution of the utility model.

Detailed ways

As shown in Figure 1, a test device for measuring the water absorption of rockfill materials under different pressures, the test device includes an outer tank 1, an inner tank 3, an external air source 2 and an automatic differential pressure measuring device 4, the inner tank The tank 3 is set inside the outer tank 1 .

As shown in Figures 1-2, the outer tank 1 includes an outer tank wall 101, an outer tank pull rod 102, an outer tank water source interface 103, an outer tank ring 104, an outer tank cover 105, an outer tank drain port 107 and an outer tank pressure sensor 108 , the outer tank 1 and the inner tank 3 share a base 106, the outer tank cover 105 is located at the upper end of the outer tank wall 101, the base 106 is located at the lower end of the outer tank wall 101, and the outer tank wall 101 is respectively connected to the outer tank cover 105. The base 106 is sealed and connected. The outer tank wall 101 is fixedly connected to the base 106 through the outer tank pull rod 102. The outer tank cover 105 is provided with an outer tank water source interface 103 and an outer tank pressure sensor 108. The outer tank water source On-off valves are respectively arranged on the interface 103 and the outlet 107 of the outer tank. The outer tank wall 101 is a cylindrical structure with a hollow interior and openings at both ends, and the material of the outer tank wall 101 is plexiglass. During the test, after sample injection, water can be injected into the outer tank 1 through the water source interface 103 of the outer tank, until the water level in the outer tank 1 is higher than the inner tank cover 306 and lower than the top of the measuring tube 304, stop water injection, and after the water injection is completed, close the outer tank Water source interface 103.

As shown in Figures 1-2, the inner tank 3 includes an inner tank wall 301, an inner tank pull rod 302, an inner tank inlet and outlet 303, a connecting hole 305, a measuring tube 304, an inner tank cover 306 and a base 106. The cover 306 is located on the upper side of the inner tank wall 301, the base 106 is located on the lower side of the inner tank wall 301, and the inner tank wall 301 is sealed and connected with the inner tank cover 306 and the base 106 respectively, and the inner tank wall 301 is connected through the inner tank pull rod 302 is fixedly connected with the base 106, the inlet and outlet of the inner tank 303 is a through hole arranged on the base 106 and can communicate with the inside of the inner tank 3 and the external water source, the inlet and outlet of the inner tank 303 is provided with a switch valve, so The inner tank wall 301 is a cylindrical structure with a hollow interior and openings at both ends, and its outer diameter is smaller than the inner diameter of the outer tank 1. The materials of the inner tank wall 301 and the measuring tube 304 are organic glass, and the inner tank cover 306 A connection hole 305 is provided in the middle, and the inside of the connection hole 305 is sealed and connected with the measuring tube 304 . During the test, the rockfill material sample to be tested is placed in the inner tank 3, and water is added to the inner tank 3 through the inlet and outlet 303 of the inner tank. The scale line at the upper end, so that the sample can be completely immersed in water to fully absorb water, wherein, the height difference between the scale line at the uppermost end of the measuring tube 304 and the water level in the outer tank 1 multiplied by the internal cross-sectional area of the measuring tube 304 is the measurable value of the device The maximum water absorption of rockfill materials. During the test, as the sample continues to absorb water, the water level in the measuring tube 304 will continue to drop, and the product of the height of the water level drop and the cross-sectional area of the measuring tube 304 is the water absorption of the sample.

As shown in Figures 1-2, the external air source 2 includes an air source interface 201, an air source connection pipeline 202, a pressure regulating valve 203, and an air storage tank 204 in sequence, and the air source interface 201 is arranged on the upper side of the outer tank 1, The gas source interface 201 is provided with a switching valve. During the test, the pressure inside the outer tank 1 can be adjusted through the pressure regulating valve 203 to obtain the required pressure conditions for the test.

As shown in Fig. 1-Fig. 2, the described differential pressure automatic measuring device 4 includes a micro-pressure sensor 401, a data acquisition 402, an inner and outer tank connecting pipeline 403, an outer tank sensor 404 and an inner tank sensor 405, and it is characterized in that the outer tank sensor 405 The tank sensor 404 is disposed between the outer tank 1 and the inner tank 3 , and the inner tank sensor 405 is disposed inside the inner tank 3 . During the test, the outer tank sensor 404 and the inner tank sensor 405 can measure the pressure values in the outer tank 1 and the inner tank 3 respectively, and the micro pressure difference sensor 401 can obtain the pressure values in the outer tank 1 and the inner tank 3 and the pressure difference in the inner tank 3, the pressure difference can be further transmitted to the data collection 402 for data collection. During the test, both the outer tank 1 and the inner tank 3 are in a sealed state. As the sample continues to absorb water, the water level in the measuring tube 304 will continue to drop, and the drop in the water level in the measuring tube 304 will cause the outer tank 1 and the inner tank 3 to Changes in the pressure difference, through the measurement and recording of the pressure difference change to obtain the water absorption of the rockfill material changes with time.

Usually the maximum particle size of the rockfill material in the laboratory is 60mm, but this device can meet the detection requirements of larger particle size rockfill materials by adjusting the diameters of the outer tank 1 and inner tank 3 of the equipment. In addition, the inner diameter and height of the measuring tube 304 can be adjusted according to the estimated water absorption of different rockfill materials, so as to improve the detection accuracy.

A test device for measuring the water absorption of rockfill materials under different pressures described in the utility model, its operation process and principle are as follows:

Step 1: Injection

Open the outer tank cover 105 and the inner tank cover 306, put the rockfill material sample to be tested into the inner tank 3, and close the inner tank cover 306 and the outer tank cover 105.

Step 2: Water enters the outer tank 1

Open the water source interface 103 of the outer tank to feed water, and when the water level is higher than the inner tank cover 306 and lower than the top of the measuring tube 304, close the water source interface 103 of the outer tank to stop the water intake.

Step 3: Water enters the inner tank 3

Open the inlet and outlet 303 of the inner tank to start water intake. The water needs to enter the measuring tube 304 on the inner tank cover 306. When the water level is higher than the water level of the outer tank 1 and lower than the uppermost scale line of the measuring tube, close the inlet and outlet 303 of the inner tank. Stop the water.

Step 4: Start the differential pressure automatic measuring device 4

Turn on the outer tank sensor 404 and the inner tank sensor 405 of the differential pressure automatic measuring device 4 .

Step 5: Adjust the test pressure

Open the valve of the air source interface 201 , adjust the test pressure leading to the outer tank 1 through the pressure regulating valve 203 , and the adjusted pressure can also be measured by the outer tank pressure sensor 108 .

Step 6: Data Acquisition, Recording and Processing

Under the test pressure, the differential pressure automatic measuring device 4 automatically collects the variation of the pressure difference between the inner tank 3 and the outer tank 1 with time at the test pressure level. Further, through data processing, the variation of the pressure difference over time is converted into the water absorption of the measured rockfill material under the test pressure over time.

During the test, after the test pressure is adjusted, both the outer tank 1 and the inner tank 3 are in a sealed state, and the sample to be tested will spontaneously absorb water when it is completely immersed in the water inside the inner tank 3. As the sample continues to absorb water, the amount The water level in the tube 304 will continue to drop, and the drop in the water level in the measuring tube 304 will lead to a change in the pressure difference between the outer tank 1 and the inner tank 3 . Through the change of the pressure difference generated by the reduction of the water volume per unit height in the measuring tube 304, the change of the pressure difference with time can be converted into the corresponding change of the water level in the measuring tube 304 during the test. Further, according to the product of the inner cross-sectional area of the measuring tube 304 and the change value of the water level in the measuring tube 304, the change of the water absorption of the rockfill material can be obtained. Accordingly, the change of the water absorption of the corresponding rockfill material over time can be obtained by measuring and recording the change in the pressure difference between the outer tank 1 and the inner tank 3 during the test.

The utility model provides a test device for measuring the water absorption of rockfill materials under different pressures. The water absorption during the test process of the rockfill materials is recorded through the measuring tube arranged on the inner tank cover, and the water absorption of the rockfill materials is recorded by setting an external air source. To provide different test pressures, and use the differential pressure automatic measuring device to convert the change of the water level in the measuring tube into the change of the pressure difference. Through the measurement and recording of the pressure difference, it is possible to realize the Measurement of water absorption.

The utility model has simple and reasonable structure, convenient operation, realizes the measurement of water absorption of rockfill materials under different pressures, has high detection efficiency and detection accuracy, and can be popularized in related fields.

It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made to the utility model, and these improvements and modifications also fall within the protection scope of the claims of the utility model Inside.

Claims (8)

1. A test device for measuring the water absorption of rockfill materials under different pressures, said test device comprising an outer tank (1), an inner tank (3), an external gas source (2) and a differential pressure automatic measuring device ( 4), the inner tank (3) is set inside the outer tank (1), and the inner tank (3) includes an inner tank wall (301), an inner tank tie rod (302), an inner tank inlet and outlet (303), connecting hole (305), measuring tube (304), inner tank cover (306) and base (106), and the described pressure difference automatic measuring device (4) includes micro-pressure sensor (401), data acquisition (402), inner and outer tank Connecting the pipeline (403), the outer tank sensor (404) and the inner tank sensor (405), it is characterized in that a connecting hole (305) is set in the middle of the inner tank cover (306), and the connecting hole (305) is sealed The measuring tube (304) is connected, the outer tank sensor (404) is arranged between the outer tank (1) and the inner tank (3), and the inner tank sensor (405) is arranged inside the inner tank (3). 2. A test device for measuring water absorption of rockfill materials under different pressures according to claim 1, characterized in that, the outer tank (1) comprises an outer tank wall (101), an outer tank pull rod (102 ), the outer tank water source interface (103), the outer tank suspension ring (104), the outer tank cover (105), the outer tank drain (107) and the outer tank pressure sensor (108), the outer tank (1) and the inner tank (3) Share a base (106). 3. A test device for measuring the water absorption of rockfill materials under different pressures according to claim 1, characterized in that, the inner tank cover (306) is located on the upper side of the inner tank wall (301), and the The base (106) is located on the lower side of the inner tank wall (301), and the inner tank wall (301) is sealed and connected with the inner tank cover (306) and the base (106) respectively, and the inner tank wall (301) is connected through the inner tank pull rod (302) is fixedly connected with the base (106), and the inner tank inlet and outlet (303) is a through hole arranged on the base (106) and can communicate with the inner and outer water sources of the inner tank (3). 4. A test device for measuring water absorption of rockfill materials under different pressures according to claim 2, characterized in that, the outer tank cover (105) is located at the upper end of the outer tank wall (101), and the base (106) is located at the lower end of the outer tank wall (101), the outer tank wall (101) is sealed and connected with the outer tank cover (105) and the base (106) respectively, and the outer tank wall (101) is connected through the outer tank pull rod (102) ) is fixedly connected with the base (106), and the outer tank cover (105) is provided with an outer tank water source interface (103) and an outer tank pressure sensor (108). 5. A test device for measuring water absorption of rockfill materials under different pressures according to claim 1, characterized in that, the external air source (2) sequentially includes an air source interface (201), an air source connection A pipeline (202), a pressure regulating valve (203) and an air storage tank (204), the air source interface (201) is arranged on the upper part of the outer tank (1). 6. A test device for measuring water absorption of rockfill materials under different pressures according to claim 2, characterized in that, the outer tank wall (101) is a cylindrical structure with a hollow interior and openings at both ends , the material of the outer tank wall (101) is plexiglass. 7. A test device for measuring water absorption of rockfill materials under different pressures according to claim 1, characterized in that, the inner tank wall (301) is a cylindrical structure with a hollow interior and openings at both ends , its outer diameter is less than the inner diameter of the outer tank (1), and the materials of the inner tank wall (301) and measuring tube (304) are organic glass. 8. A kind of test device for measuring water absorption of rockfill materials under different pressures according to claim 1, 2 or 5, characterized in that, the inlet and outlet of the inner tank (303), the water source interface of the outer tank ( 103), the outer tank drain (107) and the air source interface (201) are all provided with switching valves.