CN220322988U - Trapdor test device in unsaturated soil considering water level influence - Google Patents
Trapdor test device in unsaturated soil considering water level influence Download PDFInfo
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- CN220322988U CN220322988U CN202322219249.9U CN202322219249U CN220322988U CN 220322988 U CN220322988 U CN 220322988U CN 202322219249 U CN202322219249 U CN 202322219249U CN 220322988 U CN220322988 U CN 220322988U
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- water storage
- storage tank
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 75
- 239000002689 soil Substances 0.000 title claims abstract description 68
- 238000012360 testing method Methods 0.000 title claims abstract description 26
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims abstract description 25
- 239000004926 polymethyl methacrylate Substances 0.000 claims abstract description 25
- 238000006073 displacement reaction Methods 0.000 claims abstract description 15
- 239000011148 porous material Substances 0.000 claims abstract description 11
- 238000012544 monitoring process Methods 0.000 claims abstract description 8
- 239000004575 stone Substances 0.000 claims abstract description 7
- 239000011521 glass Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The utility model relates to the field of geotechnical engineering, in particular to a trap test device in unsaturated soil, which considers the influence of water level, and comprises a model box with an opening at the top, wherein an unsaturated soil layer is filled in the model box, the model box comprises a base, two brackets are arranged at the top of the base at intervals, a back plate and an acrylic glass plate are fixedly connected between the brackets, a supporting plate is fixedly connected between the back plate and the bottom of the acrylic glass plate and positioned between the two brackets, a water supply system is arranged between the back plate and the acrylic glass plate, the water supply system comprises two water storage tanks which are arranged at intervals, the water storage tanks are arranged between the back plate and the acrylic glass plate, the top plate of each water storage tank is a permeable stone plate, each water storage tank is connected with a Margaret bottle through a connecting pipe, a movable door is arranged between the two water storage tanks, a lifting system for enabling the movable door to move up and down is arranged at the bottom of the movable door, and a data monitoring system is also arranged on the model box; the changes of internal pressure, pore pressure and displacement in the unsaturated soil layer are affected by the simulated water level through the mahalanobis bottle and the water storage tank.
Description
Technical Field
The utility model relates to the field of geotechnical engineering, in particular to a Trapdor test device in unsaturated soil considering water level influence.
Background
The construction of structures such as shield, subway and retaining wall changes the stress condition of soil body, so that the stress in the soil is transferred and redistributed, and the stress and deformation performance of the structures are affected, which is called soil arch effect. The traditional Trapdor test device is mainly used for researching the generation, evolution and damage processes of the soil arch effect in dry sand. In practical engineering, unsaturated soil layers (including cohesive soil and non-cohesive soil) are common, and the existence of apparent cohesive force in the unsaturated soil is beneficial to maintaining the stability of the soil layers, but is influenced by the lifting of underground water level, and the apparent cohesive force is extremely easy to lose, so that the safety of a structure is threatened. Therefore, it is necessary to develop a device and a method for testing unsaturated soil trap which are suitable for and study different water levels, and develop a special study for the soil arch effect in the unsaturated soil layer.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model provides a Trapdor test device in unsaturated soil, which considers the influence of water level.
The technical scheme of the utility model is realized as follows: the trap test device in unsaturated soil considering water level influence comprises a base, wherein two brackets are arranged at the top of the base at intervals, a backboard and an acrylic glass plate are fixedly connected between the brackets, a water supply system is arranged between the backboard and the acrylic glass plate, the water supply system comprises two water storage tanks arranged at intervals, the water storage tanks are of a box body structure of a cavity, the water storage tanks are arranged between the backboard and the acrylic glass plate, the top plate of the water storage tanks is a permeable stone plate, the bottom surfaces of the water storage tank, the back plate and the acrylic glass plate are flush, the bottom surfaces of the water storage tank, the back plate and the acrylic glass plate are fixedly connected with two supporting plates which are arranged at intervals, two opposite side surfaces of the two supporting plates are respectively fixedly connected with the side surfaces of the brackets which are close to the two supporting plates, the water storage tank is connected with a Margaret bottle through a connecting pipe, a movable door is arranged between the two water storage tanks, the bottom of the movable door is provided with a lifting system which enables the movable door to move up and down, and the model box is also provided with a data monitoring system.
The data monitoring system comprises a plurality of LVDT laser displacement meters for measuring the downward displacement of the movable door and the displacement of the soil layer surface, a plurality of soil pressure meters for testing the soil pressure of the soil layer during the downward movement of the movable door, a plurality of hole pressure meters for testing the hole pressure, a plurality of datum points arranged on an acrylic glass plate for PIV analysis, and a shaft force meter for measuring the supporting force of the movable door.
Soil pressure gauge and pore pressure score layer place in unsaturated soil layer, and the equidistant distribution of soil pressure gauge of every layer, the equidistant distribution of pore pressure gauge of every layer.
The lifting system is a lifting cylinder, the free end of the lifting cylinder is fixedly connected with a shaft force meter, and the top of the shaft force meter is fixedly connected with the bottom of the movable door.
The acrylic glass plate is polished.
The LVDT laser displacement meter is fixedly arranged on the inner side surface of the upper part of the backboard through a clamp, and the clamp is arranged on the backboard through a bolt.
The fixed end fixed connection of lift cylinder is on the base.
The bottom of two water storage tanks and the limiting plate that is located the equal fixedly connected with vertical setting in both sides of lift cylinder, the bottom of limiting plate and the top fixed connection of base.
The technical scheme of the utility model has the following positive effects: the water storage tank is arranged in the model box and connected with the Marshi bottle, the top plate of the water storage tank controls the water level for the permeable stone plate through the Marshi bottle, water permeates into the unsaturated soil layer through the permeable stone plate, and the movable door moves downwards under the action of the lifting cylinder, so that the water level lifting is simulated, and the accurate test of the soil layer internal pressure field, the hole pressure field and the displacement field is realized.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
Fig. 2 is a schematic structural view of the present utility model.
Fig. 3 is a top view of the connection of the bracket, back plate, acrylic glass plate and water storage tank.
Detailed Description
As shown in fig. 1-3, the unsaturated soil trap test device considering the influence of water level comprises a base 2, two brackets 3 are arranged at intervals on the top of the base 2, a back plate 4 and an acrylic glass plate 5 are fixedly connected between the brackets 3, the back plate 4 is made of aluminum, a water supply system is arranged between the back plate 4 and the acrylic glass plate 5, the water supply system comprises two water storage tanks 7 arranged at intervals, the water storage tanks 7 are of a cavity box structure, the water storage tanks 7 are arranged between the back plate 4 and the acrylic glass plate 5, the top plate of the water storage tanks 7 is a permeable stone plate 8, the bottom surfaces of the water storage tanks 7, the back plate 4 and the acrylic glass plate 5 are flush, two supporting plates 6 arranged at intervals are fixedly connected to the bottom surfaces of the water storage tanks 7, the back plate 4 and the acrylic glass plate 5, the two opposite side surfaces of the two supporting plates 6 are respectively fixedly connected with the side surfaces of the brackets 3 which are close to the water storage tanks 7, a mahalanobis bottle 10 is connected through a connecting pipe, a movable door 11 is arranged between the two water storage tanks 7, a lifting system which enables the water storage tanks 11 to move up and down is arranged at the bottom of the movable door 11, and a model 1 is also provided with a data monitoring system;
specifically, the acrylic glass plate 5, the back plate 4, the bracket 3, the water storage tank 7 and the like are required to be sealed tightly, an unsaturated soil sample is arranged in a cavity formed by the back plate 4, the acrylic glass plate 5 and the water storage tank 7, water and soil particles are prevented from leaking in the test process, the unsaturated soil sample comprises soil samples with various different water contents, the soil samples are compacted in the cavity formed by the back plate 4, the acrylic glass plate 5, the bracket 3 and the water storage tank 7 in a layered manner, as shown in fig. 2, the highest soil bit line 22 is the highest position of the unsaturated soil, water is supplied to the water storage tank 7 through the mahalanobis bottle 10, the water level of the unsaturated soil is filled in the model tank 1 through the height control of the mahalanobis bottle 10, the water permeates from the permeable stone plate 8 to the unsaturated soil layer to form a saturated soil layer, the lifting system is started to drive the movable door 11 to move downwards, and the data monitoring system records the change of the inside the soil layer in the descending process.
The data monitoring system comprises an LVDT laser displacement meter 12 for measuring the downward displacement of the movable door and the displacement of the soil layer surface, a plurality of soil pressure meters 13 for testing the soil pressure of the soil layer during the downward movement of the movable door and a plurality of hole pressure meters 14 for testing the hole pressure, reference points 15 arranged on an acrylic glass plate 5 for PIV analysis, the reference points 15 being attached to the outer surface of the acrylic glass plate 5, and an axial force meter 16 for measuring the supporting force of the movable door; the displacement during the descent of the movable door, the axial force and the data of the soil and pore pressure gauges in the soil layer are recorded.
The soil pressure gauge 13 and the pore pressure gauge 14 are placed in the unsaturated soil layer in layers, the soil pressure gauge 13 of each layer is distributed at equal intervals, and the pore pressure gauge 14 of each layer is distributed at equal intervals; the device is used for testing soil pressure and pore pressure of soil layer during the downward movement of the movable door.
The lifting system is a lifting cylinder 17, the free end of the lifting cylinder 17 is fixedly connected with a shaft force meter 16, and the top of the shaft force meter 16 is fixedly connected to the bottom of the movable door 11; the lifting cylinder 17 controls the movable door to move downward, and the axial force meter is used for monitoring the supporting force of the movable door during the downward movement.
Polishing the acrylic glass plate 5; reducing friction between the soil particles and the glass plate.
The LVDT laser displacement meter 12 is fixedly mounted on the inner side of the upper portion of the back plate 4 by a clamp 20, and the clamp 20 is mounted on the back plate 4 by bolts.
The bottom of the lifting cylinder 17 is fixedly connected to the base 2; the bottoms of the two water storage tanks 7 are fixedly connected with limiting plates 19 which are vertically arranged and are positioned on two sides of the lifting cylinder 17, and the bottoms of the limiting plates 19 are fixedly connected with the top of the base 2; when the free end of the lifting cylinder 17 drives the interactive door 11 to lift, the limiting plates 19 on the two sides play a limiting role on the movable door 11.
Claims (8)
1. The Trapdor test device in unsaturated soil considering water level influence is characterized in that: including base (2), the top interval of base (2) is provided with two supports (3), fixedly connected with backplate (4) and ya keli glass board (5) between support (3), be provided with water supply system between backplate (4) and ya keli glass board (5), water supply system includes water storage tank (7) that two intervals set up, water storage tank (7) are the box structure of cavity, water storage tank (7) set up between backplate (4) and ya keli glass board (5), the roof of water storage tank (7) is permeable stone plate (8), water storage tank (7), the bottom surface of backplate (4) and ya keli glass board (5) is looks parallel and level, water storage tank (7), the bottom surface fixedly connected with backup pad (6) that two intervals set up of backplate (4) and ya keli glass board (5), the side fixed connection of two backup pads (6) and the support (3) that are close to it respectively, water storage tank (7) all are provided with horseshoe bottle (10) through being connected with, be provided with dodge gate (11) between two water storage tank (7), install on the bottom of dodge gate (11) and install the system of data on the mould system that moves down, it is still set up.
2. The unsaturated soil trap test device considering water level influence according to claim 1, wherein: the system comprises a data monitoring system, a plurality of LVDT laser displacement meters (12) for measuring the downward displacement of the movable door and the displacement of the soil layer surface, a plurality of soil pressure meters (13) for testing the soil pressure of the soil layer during the downward movement of the movable door, a plurality of pore pressure meters (14) for testing the pore pressure, a plurality of datum points (15) arranged on an acrylic glass plate (5) for PIV analysis, and a spindle force meter (16) for measuring the supporting force of the movable door.
3. The unsaturated soil trap test device considering water level influence according to claim 2, wherein: the soil pressure gauge (13) and the pore pressure gauge (14) are placed in the unsaturated soil layer in a layered mode, the soil pressure gauge (13) of each layer is distributed at equal intervals, and the pore pressure gauge (14) of each layer is distributed at equal intervals.
4. The unsaturated soil trap test device considering water level influence according to claim 3, wherein: the lifting system is a lifting air cylinder (17), the free end of the lifting air cylinder (17) is fixedly connected with a shaft force meter (16), and the top of the shaft force meter (16) is fixedly connected with the bottom of the movable door (11).
5. The unsaturated soil trap test device considering water level influence according to claim 4, wherein: the acrylic glass plate (5) is polished.
6. The unsaturated soil trap test device considering water level influence according to claim 5, wherein: the LVDT laser displacement meter (12) is fixedly arranged on the inner side surface of the upper part of the backboard (4) through a clamp (20), and the clamp (20) is arranged on the backboard (4) through bolts.
7. The unsaturated soil trap test device considering water level influence according to claim 4, wherein: the fixed end of the lifting cylinder (17) is fixedly connected to the base (2).
8. The unsaturated soil trap test device considering water level influence according to claim 4, wherein: the bottoms of the two water storage tanks (7) are fixedly connected with limiting plates (19) which are vertically arranged and are positioned on two sides of the lifting cylinder (17), and the bottoms of the limiting plates (19) are fixedly connected with the top of the base (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322219249.9U CN220322988U (en) | 2023-08-17 | 2023-08-17 | Trapdor test device in unsaturated soil considering water level influence |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322219249.9U CN220322988U (en) | 2023-08-17 | 2023-08-17 | Trapdor test device in unsaturated soil considering water level influence |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220322988U true CN220322988U (en) | 2024-01-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322219249.9U Active CN220322988U (en) | 2023-08-17 | 2023-08-17 | Trapdor test device in unsaturated soil considering water level influence |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220322988U (en) |
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2023
- 2023-08-17 CN CN202322219249.9U patent/CN220322988U/en active Active
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