CN113293808A - Test device and method capable of simulating foundation pit retaining wall displacement to induce wall rear soil body deformation - Google Patents
Test device and method capable of simulating foundation pit retaining wall displacement to induce wall rear soil body deformation Download PDFInfo
- Publication number
- CN113293808A CN113293808A CN202110565406.4A CN202110565406A CN113293808A CN 113293808 A CN113293808 A CN 113293808A CN 202110565406 A CN202110565406 A CN 202110565406A CN 113293808 A CN113293808 A CN 113293808A
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- soil body
- displacement
- partition plate
- foundation pit
- wall
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/02—Retaining or protecting walls
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention relates to the technical field of foundation pit engineering, in particular to a test device and a test method capable of simulating foundation pit retaining wall deflection to induce wall rear soil body deformation. The device comprises a model box, a soil body partition plate and a movable baffle plate; the soil body partition plate divides the model box into a foundation pit chamber and a soil body chamber; the front end and the rear end of the soil body partition plate extend out of the outer side of the model box and are fixed through a plurality of displacement screws, screw fixing pore plates are arranged on the left side and the right side of the soil body partition plate, a plurality of threaded holes matched with the displacement screws are formed in the screw fixing pore plates from top to bottom, and the end parts of the displacement screws penetrate through the screw fixing pore plates and are supported on the two sides of the soil body partition plate; during the experiment, can adjust the horizontal displacement of the soil body baffle that this displacement screw corresponds through the rotation number of turns of adjusting a certain or a plurality of displacement screws. The method is used for simulating the influence of deformation of the diaphragm wall on the surrounding environment in actual foundation pit engineering excavation, aims to solve the potential safety hazard caused by deformation of the diaphragm wall in actual engineering, and achieves the effect of economy.
Description
Technical Field
The invention relates to the technical field of foundation pit engineering, in particular to a test device and a test method capable of simulating foundation pit retaining wall deflection to induce wall rear soil body deformation.
Background
With the development of urbanization, high-rise buildings, underground complexes and subway stations begin to be built on a large scale. This is accompanied by the large-scale excavation of foundation pits. The problem of influence on important buildings and surrounding environment around the foundation pit caused by excavation of the foundation pit is more and more prominent.
At present, the calculation of the influence of the retaining wall deflection caused by foundation pit excavation on the soil body behind the wall has no theoretical numerical solution, and the calculation by using an empirical method or a finite element has certain errors, or the material is wasted due to conservative design, or potential safety hazards exist. And the influence of excavation on the soil behind the wall is limited within an acceptable range through on-site monitoring and measurement, so that a large amount of manpower and material resources are required to be input to ensure real-time feedback adjustment.
Disclosure of Invention
In order to overcome the technical problems in the prior art, the invention discloses a test device capable of simulating the deformation condition of a soil body behind a foundation pit retaining wall caused by displacement, which is used for simulating the influence of the deformation of an underground diaphragm wall on the surrounding environment in the actual foundation pit engineering excavation, aiming at solving the potential safety hazard caused by the deformation of the underground diaphragm wall in the actual engineering and achieving the effect of economy.
The specific technical scheme provided by the invention is as follows:
a test device capable of simulating foundation pit retaining wall displacement to induce wall rear soil deformation comprises a model box and a soil partition plate; openings are formed in the top and one vertical side of the model box, and a movable baffle is arranged at the vertical opening of the model box; the model box is divided into a left simulation chamber and a right simulation chamber with adjustable widths by the soil body partition plate, wherein the left chamber between the movable baffle plate and the soil body partition plate is a simulated foundation pit chamber, and the right chamber between the soil body partition plate and the right side wall of the model box is a soil body chamber;
the front end and the rear end of the soil body partition plate extend out of the outer side of the model box and are fixed through a plurality of displacement screws, screw fixing pore plates are arranged on the left side and the right side of the soil body partition plate, a plurality of threaded holes matched with the displacement screws are formed in the screw fixing pore plates from top to bottom, and the end parts of the displacement screws penetrate through the screw fixing pore plates and are supported on the two sides of the soil body partition plate; during the experiment, can adjust the horizontal displacement of the soil body baffle that this displacement screw corresponds through the rotation number of turns of adjusting a certain or a plurality of displacement screws.
Furthermore, the soil body partition plate comprises a supporting plate and contact surface simulation materials attached to two sides of the supporting plate, and the contact surface simulation materials are used for simulating contact between the foundation pit retaining wall and the soil body.
Further, slot positions for assembling soil body partition walls are arranged on the front side wall and the rear side wall of the model box; the width of the groove position is larger than that of the soil body partition plate, and elastic baffles with the same thickness are filled in the gap between the model box and the contact surface simulation materials on the two sides.
Furthermore, a plurality of longitudinally distributed positioning bolts are fixed at the front end and the rear end of the movable baffle plate; a plurality of rows of positioning bolt holes are formed in the front side wall and the rear side wall of the model box, and each row of positioning bolt holes corresponds to the positioning bolt on the movable baffle in position.
Furthermore, the displacement screw is a hexagonal screw with a small lead, and the displacement of the soil body partition plate at a certain height can be obtained by multiplying the number of turns of the rotation of the displacement screw at the same height by the lead.
Furthermore, the bracket is provided with a dial indicator at the appointed position of the soil body partition plate, wherein the dial indicator is acted on by the bracket and used for guiding the number of rotation turns of the corresponding displacement screw.
Furthermore, the test method of the test device capable of simulating foundation pit retaining wall displacement to induce wall back soil body deformation comprises the following steps:
step 1, fixing a movable baffle at a proper positioning bolt hole according to a foundation pit to be researched, respectively placing soil bodies with proper heights in a simulated foundation pit chamber and a simulated soil body chamber, leveling the soil bodies and taking a picture;
step 2, rotating corresponding displacement screws according to data collected by actual engineering to enable the soil body partition plates to generate corresponding deformation so as to simulate the deflection condition of the actual engineering retaining wall;
and 3, photographing the deformed soil body, and comparing the photographs when the soil body partition plate is not deformed to obtain the deformation condition of the soil body behind the wall.
The invention has the following beneficial effects:
the simulation box is arranged, the model box is divided into a left simulation chamber and a right simulation chamber by utilizing the soil body partition plate, the front end and the rear end of the soil body partition plate extend out of the outer side of the model box and are fixed by a plurality of displacement screws, and the end parts of the displacement screws are supported on two sides of the soil body partition plate; during the experiment, can adjust the horizontal displacement of the soil body baffle that this displacement screw corresponds through the rotation number of turns of adjusting a certain or a plurality of displacement screws. The invention has simple structure and low cost, is used for simulating the influence of the deformation of the diaphragm wall on the surrounding environment in the actual excavation of the foundation pit engineering, aims to solve the potential safety hazard caused by the deformation of the diaphragm wall in the actual engineering and achieves the effect of economy.
Drawings
FIG. 1 is a three-dimensional schematic of a test apparatus according to the present invention;
FIG. 2 is a front view of the test apparatus of the present invention;
FIG. 3 is a left side view of FIG. 2;
fig. 4 is a top view of fig. 2.
In the figure: 1. a model box; 11. a foundation pit chamber; 12. a soil body chamber; 2. supporting the guard plate; 3. a contact surface simulating material; 4. elastic blocking; 5. a displacement screw; 6. fixing the pore plate by a screw; 7. a movable baffle; 8. positioning a bolt; 9. and (6) positioning the bolt hole.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, a test apparatus for simulating foundation pit retaining wall displacement induced wall back soil deformation provided by the embodiment of the invention comprises a rectangular model box 1 and soil partition boards; the top and the left side of the model box 1 are both provided with openings, and a movable baffle 7 is arranged at the opening at the left side of the model box; the model box 1 is divided into a left simulation chamber and a right simulation chamber by the soil body partition plate, wherein the left chamber between the movable baffle 7 and the soil body partition plate is a simulated foundation pit chamber 11, and the right chamber between the soil body partition plate and the right side wall of the model box is a soil body chamber 12.
The soil body baffle includes a support guard plate 2 and contact surface simulation materials 3 attached to two sides of the support guard plate 2, and is used for simulating contact between the foundation pit retaining wall and the soil body. The front side wall and the rear side wall of the model box 1 are provided with groove positions for assembling soil body partition walls; the width of the groove position is larger than that of the soil body partition plate, and an elastic separation baffle 4 with the same thickness is filled in a gap between the model box 1 and the contact surface simulation materials 3 on the two sides. As a preferable technical scheme, the model box 1 can be made of high-strength transparent glass, so that the model box can be observed in an experiment; the supporting and protecting plate 2 can be made of an aluminum plate with equivalent bending rigidity; the contact surface simulation material 3 can be selected from an epoxy coating; the elastic barrier 4 can be made of emulsion materials.
Both ends stretch out to around the soil body baffle the outside of mold box 1 and fixed through a plurality of displacement screws 5, it is specific, the side all is equipped with screw fixation orifice plate 6 about the soil body baffle, screw fixation orifice plate 6 is last from last to being equipped with down a plurality of and displacement screw 5 complex screw holes, the tip of displacement screw 5 link up screw fixation orifice plate 6 and the top is held in the both sides of soil body baffle. During the experiment, the horizontal displacement of the soil body partition plate corresponding to the displacement screw can be adjusted by adjusting the rotation number of turns of one or more displacement screws 5. Preferably, the displacement screw 5 can be a hexagonal screw with a smaller lead, and the displacement of the soil body partition plate at a certain height can be obtained by multiplying the lead by the number of turns of the displacement screw 5 at the same height. As a preferable technical scheme, the dial indicator can be acted on the soil body partition plate with the designated height by utilizing the bracket to guide to rotate the displacement screw 5 with the corresponding height.
Preferably, a plurality of longitudinally distributed positioning bolts 8 are fixed at the front end and the rear end of the movable baffle 7; all be equipped with multiseriate location bolt hole 9 on model case 1's the preceding and following lateral wall, each location bolt hole 9 of being listed as corresponds with the location bolt 8 position on the movable baffle 7 to through the cooperation of location bolt 8 with different row location bolt holes 9, realize moving baffle 7 and remove, thereby satisfy the simulation demand to different width basic pit rooms.
The invention also discloses a simulation test method of the test device, which comprises the following steps:
step 1, fixing a movable baffle 7 at a proper positioning bolt hole 9 according to a foundation pit to be researched, respectively placing soil bodies with proper heights in a simulated foundation pit chamber 11 and a simulated soil body chamber 12, leveling the soil bodies, and taking a picture by using a camera;
step 2, rotating corresponding displacement screws 5 according to data collected by actual engineering to enable the soil body partition plate to generate corresponding deformation so as to simulate the deflection condition of the retaining wall of the actual engineering;
and 3, photographing the deformed soil body, and comparing the photographs when the soil body partition plate is not deformed to obtain the deformation condition of the soil body behind the wall.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to encompass such modifications and variations.
Claims (7)
1. The utility model provides a can simulate foundation ditch barricade shifts and induces test device that soil body warp behind wall which characterized in that: the device comprises a model box and a soil body clapboard; openings are formed in the top and one vertical side of the model box, and a movable baffle is arranged at the vertical opening of the model box; the model box is divided into a left simulation chamber and a right simulation chamber with adjustable widths by the soil body partition plate, wherein the left chamber between the movable baffle plate and the soil body partition plate is a simulated foundation pit chamber, and the right chamber between the soil body partition plate and the right side wall of the model box is a soil body chamber;
the front end and the rear end of the soil body partition plate extend out of the outer side of the model box and are fixed through a plurality of displacement screws, screw fixing pore plates are arranged on the left side and the right side of the soil body partition plate, a plurality of threaded holes matched with the displacement screws are formed in the screw fixing pore plates from top to bottom, and the end parts of the displacement screws penetrate through the screw fixing pore plates and are supported on the two sides of the soil body partition plate; during the experiment, can adjust the horizontal displacement of the soil body baffle that this displacement screw corresponds through the rotation number of turns of adjusting a certain or a plurality of displacement screws.
2. The test device capable of simulating foundation pit retaining wall displacement to induce wall back soil body deformation according to claim 1, characterized in that: the soil body partition plate comprises a supporting plate and contact surface simulation materials attached to two sides of the supporting plate, and is used for simulating contact between the foundation pit retaining wall and the soil body.
3. The test device capable of simulating foundation pit retaining wall displacement to induce wall back soil body deformation according to claim 2, wherein: the front side wall and the rear side wall of the model box are provided with groove positions for assembling soil body partition walls; the width of the groove position is larger than that of the soil body partition plate, and elastic baffles with the same thickness are filled in the gap between the model box and the contact surface simulation materials on the two sides.
4. The test device capable of simulating foundation pit retaining wall displacement to induce wall back soil body deformation according to claim 1, characterized in that: a plurality of longitudinally distributed positioning bolts are fixed at the front end and the rear end of the movable baffle; a plurality of rows of positioning bolt holes are formed in the front side wall and the rear side wall of the model box, and each row of positioning bolt holes corresponds to the positioning bolt on the movable baffle in position.
5. The test device capable of simulating foundation pit retaining wall displacement to induce wall back soil body deformation according to claim 1, characterized in that: the displacement screw is a hexagonal screw with a smaller lead, and the displacement of the soil body partition plate at a certain height can be obtained by multiplying the number of turns of the rotation of the displacement screw at the same height by the lead.
6. The test device capable of simulating foundation pit retaining wall displacement to induce wall back soil body deformation according to claim 1, characterized in that: the support is provided with a dial indicator at the appointed position of the soil body partition plate, and the dial indicator is acted on the appointed position of the soil body partition plate by the dial indicator and used for guiding the number of rotation turns of the corresponding displacement screw.
7. The test method of the test device capable of simulating foundation pit retaining wall displacement to induce wall back soil deformation according to any one of claims 1 to 6, wherein the test method comprises the following steps: the method comprises the following steps:
step 1, fixing a movable baffle at a proper positioning bolt hole according to a foundation pit to be researched, respectively placing soil bodies with proper heights in a simulated foundation pit chamber and a simulated soil body chamber, leveling the soil bodies and taking a picture;
step 2, rotating corresponding displacement screws according to data collected by actual engineering to enable the soil body partition plates to generate corresponding deformation so as to simulate the deflection condition of the actual engineering retaining wall;
and 3, photographing the deformed soil body, and comparing the photographs when the soil body partition plate is not deformed to obtain the deformation condition of the soil body behind the wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110565406.4A CN113293808A (en) | 2021-05-24 | 2021-05-24 | Test device and method capable of simulating foundation pit retaining wall displacement to induce wall rear soil body deformation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110565406.4A CN113293808A (en) | 2021-05-24 | 2021-05-24 | Test device and method capable of simulating foundation pit retaining wall displacement to induce wall rear soil body deformation |
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| Publication Number | Publication Date |
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| CN113293808A true CN113293808A (en) | 2021-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110565406.4A Withdrawn CN113293808A (en) | 2021-05-24 | 2021-05-24 | Test device and method capable of simulating foundation pit retaining wall displacement to induce wall rear soil body deformation |
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| Country | Link |
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| CN (1) | CN113293808A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114108715A (en) * | 2021-12-02 | 2022-03-01 | 南昌轨道交通集团有限公司 | Test device and method for simulating foundation pit rainfall |
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| CN203391079U (en) * | 2013-05-28 | 2014-01-15 | 中铁五局（集团）有限公司 | Fast-disassembled multipurpose die |
| CN205712215U (en) * | 2016-04-01 | 2016-11-23 | 浙江大学 | The excavation of foundation pit model test apparatus of simulation artesian head lifting |
| CN105926685A (en) * | 2016-04-28 | 2016-09-07 | 中国科学院武汉岩土力学研究所 | Built-in retaining wall type earth pressure displacement effect test method |
| CN106370452A (en) * | 2016-11-21 | 2017-02-01 | 郑州大学 | Multifunctional movable retaining wall test device |
| CN107389897A (en) * | 2017-06-13 | 2017-11-24 | 上海交通大学 | Foundation ditch stage excavation and non-uniform displacement supporting lateral pressure test device and method |
| CN107389446A (en) * | 2017-06-13 | 2017-11-24 | 上海交通大学 | It is layered off-load and non-homogeneous sidesway supporting lateral pressure test model apparatus and method |
| CN108505548A (en) * | 2018-03-27 | 2018-09-07 | 山东大学 | A kind of Piled Embankments stake soil loading ratio experimental rig and test method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114108715A (en) * | 2021-12-02 | 2022-03-01 | 南昌轨道交通集团有限公司 | Test device and method for simulating foundation pit rainfall |
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Application publication date: 20210824 |