CN109706981B - Vibrating table model test system for high-steep slope pier foundation stress deformation characteristics - Google Patents
Vibrating table model test system for high-steep slope pier foundation stress deformation characteristics Download PDFInfo
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- CN109706981B CN109706981B CN201811633225.5A CN201811633225A CN109706981B CN 109706981 B CN109706981 B CN 109706981B CN 201811633225 A CN201811633225 A CN 201811633225A CN 109706981 B CN109706981 B CN 109706981B
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- 238000012360 testing method Methods 0.000 title claims abstract description 51
- 239000002689 soil Substances 0.000 claims abstract description 43
- 238000004088 simulation Methods 0.000 claims abstract description 13
- 238000006073 displacement reaction Methods 0.000 claims abstract description 11
- 238000013461 design Methods 0.000 claims description 11
- 238000004458 analytical method Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 3
- 229910000906 Bronze Inorganic materials 0.000 description 12
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 12
- 239000010974 bronze Substances 0.000 description 12
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 229910052742 iron Inorganic materials 0.000 description 5
- 230000002787 reinforcement Effects 0.000 description 5
- 230000001133 acceleration Effects 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The utility model relates to a vibrating table model test system for the stress deformation characteristic of a high-steep slope pier foundation, which relates to the civil engineering technology, and comprises the following parts: slope bedrock simulation area; the bridge pier and the slide-resistant pile are tested; the beam span load simulation unit comprises a sliding track and a weight capable of sliding on the track, and the sliding track is arranged at the top of the bridge pier to be tested; the basic index testing unit comprises strain gauges arranged on the front side and the rear side of a foundation of a bridge pier to be tested, a movable soil pressure box vertically buried in soil bodies on the front side and the rear side of the bridge pier, a horizontal accelerometer arranged in a slope bedrock simulation area, and a horizontal displacement meter arranged on the slide-resistant pile and the bridge pier; the soil body strain testing unit comprises a strain testing belt buried in soil bodies on the front side and the rear side of the bridge pier, and the strain testing belt is provided with a strain gauge. The utility model can truly reproduce the earthquake dynamic response of the simple supporting box girder at the top of the pier, and ensure the true and reliable analysis of the stress deformation of the foundation of the high-steep slope pier.
Description
Technical Field
The utility model relates to civil engineering technology, in particular to civil engineering test technology.
Background
The vibration table model test has the characteristics of low cost, controllability, short test period and the like, and is widely applied to various seismic engineering researches. Through a vibrating table model test, the earthquake response characteristic and the damage mechanism of the structure can be researched, the weak links of the earthquake resistance of the structure are analyzed, the earthquake resistance of the whole structure is evaluated, and a technical basis is provided for the earthquake resistance reinforcement design. The test research of the vibrating table model on the foundation of the high-steep slope pier has not been developed at home and abroad, the corresponding test work lacks practical experience, and if the test working condition of the vibrating table model cannot be matched with the field, the test data is distorted, so that the test of the vibrating table model is lost.
Under the influence of the geographic and geological conditions, a large number of mountain bridge foundations are inevitably positioned on poor geologic bodies such as high and steep side slopes, meanwhile, a line passes through a high-intensity earthquake region, and an anti-slip supporting structure is required to be designed for earthquake-proof reinforcement. The railway bridge foundation and foundation design standard and the highway bridge foundation and foundation design standard propose corresponding standards and requirements for pier pile foundation design from the aspects of foundation overturning sliding stability, pile foundation bearing capacity, pile foundation construction and the like. For the anti-seismic design of the anti-slip retaining structure for reinforcing the pier foundation, if the high-steep slope effect is ignored, larger errors are necessarily caused in the calculation of the stress deformation of the pier pile foundation, and even the integral safety evaluation of the bridge structure is endangered.
In engineering practice, particularly after Wenchuan earthquake, working conditions of the anti-slip retaining structure for reinforcing the high-steep slope pier foundation exist in a large quantity, and if a semi-empirical semi-theoretical method is still adopted for determining the reinforcing scheme of the high-steep slope pier foundation, engineering design is deviated from conservation or potential risks exist.
The construction scale of railways and highways in China is huge, and a large number of pier foundations are inevitably positioned on high-steep side slopes and earthquake fracture zones. If the earthquake stress deformation characteristic of the high and steep slope pier foundation can be mastered, the corresponding earthquake-resistant reinforcement design can be carried out, and huge economic and social benefits can be brought.
Disclosure of Invention
The utility model aims to solve the technical problem of providing a vibrating table model test system for researching the stress deformation characteristics of a high-steep slope pier foundation, which can truly reproduce the influence of bridge span load on the stress deformation of a pier foundation during an earthquake, accurately obtain the pressure, acceleration peak value and shear deformation of soil near the high-steep slope pier foundation, and the horizontal displacement of a pier foundation pile body strain and a bearing platform, grasp the earthquake stress deformation rule of the high-steep slope pier foundation, provide technical support for the earthquake-resistant reinforcement design of the high-steep slope pier foundation, and meet the stress deformation requirement of the pier foundation during the earthquake.
The technical scheme adopted by the utility model for solving the technical problems is that the vibrating table model test system for the foundation stress deformation characteristic of the high-steep slope pier is characterized by comprising the following parts:
slope bedrock simulation area;
the bridge pier and the slide-resistant pile are tested;
the beam span load simulation unit comprises a sliding track and a weight capable of sliding on the track, and the sliding track is arranged at the top of the bridge pier to be tested; the weight is used to simulate the track on the bridge and the train load.
The basic index testing unit comprises strain gauges arranged on the front side and the rear side of a foundation of a bridge pier to be tested, a movable soil pressure box vertically buried in soil bodies on the front side and the rear side of the bridge pier, a horizontal accelerometer arranged in a slope bedrock simulation area, and a horizontal displacement meter arranged on the slide-resistant pile and the bridge pier; the main sliding direction along the side slope is the front side, and the symmetrical position is the rear side.
The soil body strain testing unit comprises a strain testing belt buried in soil bodies on the front side and the rear side of the bridge pier, and the strain testing belt is provided with a strain gauge.
The top free end of the strain testing belt is arranged on the surface of the slope body. The track direction is consistent with the railway design line direction.
The utility model has the beneficial effects that the on-site earthquake working condition is simulated by utilizing the inertial sliding and collision of the weight (weight) on the unidirectional track, the earthquake power response of the simple box girder at the top of the pier is truly reproduced, and the true and reliable analysis of the foundation stress deformation of the high-steep slope pier is ensured; testing the dynamic soil pressure and horizontal acceleration peak values of soil bodies on the front side and the rear side of the high-steep slope pier foundation through a system, and the strain of pier foundation piles and the horizontal displacement of bearing platforms, connecting the stress deformation of the high-steep slope pier foundation with the dynamic response of the soil bodies, and analyzing the main influencing factors of the stress deformation of the high-steep slope pier foundation; and testing soil shearing deformation by using the phosphor bronze belt adhered with the strain gauge, and researching the influence of soil strain on high-steep slope pier foundation stress deformation in an earthquake.
Drawings
FIG. 1 is a schematic vertical section view of a test device for a vibrating table model for researching the basic stress deformation characteristics of a high-steep slope pier.
Fig. 2 is a top view of a vibrating table model test device for researching the basic stress deformation characteristics of a high-steep slope pier according to the utility model.
Fig. 3 is a top view of a beam span load model in the vibrating table model test device for researching the basic stress deformation characteristics of the high-steep slope pier.
Fig. 4 is a cross-sectional view of a beam span load model in a shaking table model test device for researching the basic stress deformation characteristics of a high-steep slope pier.
Fig. 5 is an elevation view of a beam span load model in a vibrating table model test device for researching the basic stress deformation characteristics of a high-steep slope pier.
FIG. 6 is a top view of a cylindrical thin-walled plastic container in a shaking table model test apparatus for studying the basic force deformation characteristics of a high-steep slope pier according to the present utility model.
FIG. 7 is a cross-sectional view of a cylindrical thin-walled plastic container in a shaking table model test apparatus for studying the basic force deformation characteristics of a high-steep slope pier according to the present utility model.
Fig. 8 is a schematic view of a phosphor bronze band attached with a strain gauge in a vibrating table model test device for researching the basic stress deformation characteristics of a high-steep slope pier.
Fig. 9 is a plan view of the bridge pier.
The figure shows the parts, part names and corresponding labels: the device comprises a weight 1, a unidirectional track 2, an iron box 3, a cylindrical thin-wall plastic container 4, a horizontal accelerometer 5, a nut fastener 6, a phosphor bronze belt 7, a strain gauge 8, a movable soil pressure box 9 and a horizontal displacement meter 10.
Detailed Description
The utility model will be further described with reference to the drawings and examples.
The utility model comprises a beam span load simulation part, a basic index test part and a soil body strain test part, and is characterized in that: the beam span load simulation part is characterized in that an iron box is fixed on the pier top, a track for the one-way free sliding of the weight is welded in the iron box along the direction of a line, two weights are towed on the track at a certain distance according to a similar relationship, and the weight of the weights is a simple support box Liang Hezai born on two sides of the pier top; the basic index test part is a strain gauge stuck to a middle foundation pile at the front and rear sides of a bridge pier foundation, a movable soil pressure box vertically embedded in soil mass at the front and rear sides of the bridge pier, a horizontal accelerometer fixed in a cylindrical thin-wall plastic container, and a horizontal displacement meter arranged on the surface of a bearing platform; the soil body strain test part is a phosphor bronze strip with strain gauges adhered in soil bodies at the front and rear sides of the bridge pier, the bottom is fixed in bedrock, and the top free end reaches the surface of the slope body.
Direction interpretation: the sliding direction of the slope is the front side, and vice versa, for example, the direction indicated by the broken line arrow in fig. 1 is the front side.
Referring to fig. 1 and 2, the utility model comprises a beam span load simulation part, a basic index test part and a soil body strain test part, wherein an iron box 3 is fixed on the pier top, a unidirectional track 2 for unidirectional free sliding of a weight 1 is welded in the iron box 3 along the line direction, two weights 1 are pulled on the unidirectional track 2 at a certain distance according to a similar relationship, and the weight of the weight 1 is a simple support box Liang Hezai borne by two sides of the pier top; the basic index test part comprises a strain gage 8 stuck on a middle foundation pile at the front side and the rear side of a pier foundation, a movable soil pressure box 9 vertically embedded in soil body at the front side and the rear side of the pier, a horizontal accelerometer 5 fixed in a cylindrical thin-wall plastic container 4, and a horizontal displacement meter 10 arranged on the surface of a bearing platform; the soil body strain test part is a phosphor bronze strip 7 with strain gauges 8 adhered in soil bodies at the front and rear sides of the bridge pier, the bottom is fixed in bedrock, and the free end of the top reaches the surface of the slope body. The inertial sliding and collision of the weight 1 on the unidirectional track 2 are utilized to simulate the on-site earthquake working condition, so that the earthquake dynamic response of the simple box girder at the top of the bridge pier is truly reproduced, and the true and reliable analysis of the foundation stress deformation of the bridge pier with the high steep side is ensured; testing the dynamic soil pressure and horizontal acceleration peak values of soil bodies on the front side and the rear side of the high-steep slope pier foundation through a system, and the strain of pier foundation piles and the horizontal displacement of bearing platforms, connecting the stress deformation of the high-steep slope pier foundation with the dynamic response of the soil bodies, and analyzing the main influencing factors of the stress deformation of the high-steep slope pier foundation; and the shearing deformation of the soil body is tested by using the phosphor bronze strip 7 adhered with the strain gauge 8, and the influence of the soil body strain on the stress deformation of the high-steep slope pier foundation in the earthquake is studied. The vibration table model test system can truly reproduce the influence of beam span load on the stress deformation of the pier foundation during an earthquake, accurately obtain the pressure, acceleration peak value and shear deformation of soil mass near the high-steep slope pier foundation, the pile body strain of the pier foundation and the horizontal displacement of the bearing platform, grasp the earthquake stress deformation rule of the high-steep slope pier foundation, provide technical support for the earthquake-proof reinforcement design of the high-steep slope pier foundation and meet the stress deformation requirement of the pier foundation during the earthquake. The utility model is not only suitable for the test of the vibrating table model with the stress deformation characteristic of the foundation of the high-steep slope pier, but also can be used for the test of the vibrating table model with the stress deformation characteristic of the geotechnical engineering geotechnical structure.
Referring to fig. 1, the moving soil pressure boxes 9 are vertically buried in rock and soil bodies at the front and rear sides of the bridge pier, the diameter of each moving soil pressure box 9 is (0.5-1.5) times that of a foundation pile of the bridge pier, and uniform fine sand with the thickness of 1cm and the particle diameter of (0.3-1.18) mm is buried at the front and rear sides of each moving soil pressure box 9, so that uniform stress of each moving soil pressure box 9 is ensured. The bridge pier foundation pile is provided with a polished flat and clean plane at the position where the strain gauge 8 is adhered, and the working bridge path of the strain gauge 8 is a quarter bridge. The horizontal displacement meter 10 is fixed on the rigid frame structure of the model box and moves along with the table surface of the vibrating table in real time.
Referring to fig. 3, 4 and 5, the friction coefficient of the unidirectional track 2 of the beam span load simulation part is equal to that of the original pier top support, the distance between the weights 1 meets the length similarity ratio, the weight of each weight 1 is equal to half of the span load of the horizontal beam span of the adjacent pier, and the seismic inertia effect of the span load of the beam is simulated.
Referring to fig. 6 and 7, the wall of the cylindrical thin-wall plastic container 4 is buried horizontally at the measuring point position, the diameter of the cylinder is 2.5 times of the outer diameter of the horizontal accelerometer 5, the height of the cylinder is 1.5 times of the axial dimension of the horizontal accelerometer 5, the horizontal accelerometer 5 is fixed at the bottom of the cylindrical thin-wall plastic container 4 by a nut 6, and the density of the soil buried in the cylindrical thin-wall plastic container 4 is consistent with that of the soil buried nearby.
The two sides of the phosphor bronze band 7 shown in fig. 8 are symmetrically stuck with strain gauges 8, and the working bridge of the strain gauges 8 is a half bridge. The phosphor bronze strip 7 is 0.3mm thick, flexibility and fatigue resistance can be guaranteed, the top of the phosphor bronze strip 7 is a free end, the phosphor bronze strip reaches the slope position, the bottom is a fixed end, the phosphor bronze strip 7 is anchored in bedrock, and the phosphor bronze strip 7 deforms along with the soil body during vibration.
Claims (1)
1. The vibrating table model test system for the high-steep slope pier foundation stress deformation characteristics is characterized by comprising the following parts:
slope bedrock simulation area;
the bridge pier and the slide-resistant pile are tested;
the beam span load simulation unit comprises a sliding track and a weight capable of sliding on the track, and the sliding track is arranged at the top of the bridge pier to be tested;
the basic index testing unit comprises strain gauges arranged on the front side and the rear side of a foundation of a bridge pier to be tested, a movable soil pressure box vertically buried in soil bodies on the front side and the rear side of the bridge pier, a horizontal accelerometer arranged in a slope bedrock simulation area, and a horizontal displacement meter arranged on the slide-resistant pile and the bridge pier;
the soil body strain testing unit comprises a strain testing belt buried in soil bodies on the front side and the rear side of the bridge pier, and the strain testing belt is provided with a strain gauge;
the top free end of the strain testing belt is arranged on the surface of the slope body; the track direction is consistent with the railway design line direction.
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| CN201811633225.5A CN109706981B (en) | 2018-12-29 | 2018-12-29 | Vibrating table model test system for high-steep slope pier foundation stress deformation characteristics |
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| CN201811633225.5A CN109706981B (en) | 2018-12-29 | 2018-12-29 | Vibrating table model test system for high-steep slope pier foundation stress deformation characteristics |
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| CN109706981A CN109706981A (en) | 2019-05-03 |
| CN109706981B true CN109706981B (en) | 2023-09-22 |
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| CN111796072B (en) * | 2020-06-24 | 2024-10-22 | 中铁第一勘察设计院集团有限公司 | High-steep slope vibrating table test system under rainfall condition and construction test method thereof |
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| CN113882441B (en) * | 2021-10-13 | 2022-05-03 | 河海大学 | An early warning method for seismic instability of high and steep slopes and its application |
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