CN220136871U - An array type air pressure driven retaining wall displacement simulation test system - Google Patents

Abstract

The utility model discloses an array type air pressure driving retaining wall deflection simulation test system which comprises a soil filling box, front and rear baffles and a horizontal pushing system. The front baffle plate and the rear baffle plate simulate foundation pit retaining walls, springs are arranged between the two baffle plates in an array mode and are respectively connected with the front baffle plate and the rear baffle plate, the front baffle plate is composed of rigid blocks with U-shaped grooves of the same size, the rigid blocks can slide relatively, and a horizontal traction device is connected to the rigid blocks. The horizontal traction device consists of a push rod, a hinged connecting rod, a pneumatic compression rod, an air bag and an inflator pump. The horizontal pulling device can pull the front retaining wall and the rear retaining wall to rotate or horizontally displace. The utility model solves the problem that the displacement analysis of the adjacent structure induced by the displacement of the existing foundation pit retaining wall can not meet the requirement.

Description

An array type air pressure driven retaining wall displacement simulation test system

Technical field

The utility model belongs to the technical field of foundation pit engineering, and in particular relates to an array type air pressure driven retaining wall displacement simulation test system.

Background technique

The displacement of the enclosure structure caused by the excavation of the foundation pit will destroy the internal pressure balance of the adjacent soil, causing the adjacent building structure to undergo horizontal displacement or a certain amount of settlement. At present, the analysis of the displacement of adjacent structures induced by the displacement of the retaining wall of the foundation pit lacks strict numerical analysis or theoretical calculation. However, strict numerical analysis takes a long time, and the parameter selection in the theoretical calculation needs to be supported by experiments. There is a certain error in the estimation of the displacement of adjacent structures caused by the displacement of the retaining wall of the foundation pit, which often leads to waste in design or safety hazards; on-site monitoring often requires more manpower and material resources, and information feedback in the project also has a certain timeliness Sexuality, it does not have a good effect on projects under construction.

Utility model content

The purpose of this utility model is to propose an array type air pressure driven retaining wall displacement simulation test system in order to solve the problem that the displacement analysis of adjacent structures induced by the displacement of the existing foundation pit retaining wall cannot meet the needs.

In order to achieve the above purpose, the present utility model adopts the following technical solutions:

An array-type pneumatic-driven retaining wall displacement simulation test system includes a filling box. A vertical back baffle is provided in the filling box, so that a foundation pit chamber is formed in the filling box behind the back baffle. The pit chamber is filled with soil; a plurality of first springs distributed in a rectangular array are fixed between the front and rear baffles. A rigid block with a U-shaped groove is fixed at the front end of each first spring, and multiple rigid blocks with a U-shaped groove are fixed. The dense paving forms a front baffle as large as the rear baffle; the rear baffle, the first spring and the front baffle together form a retaining wall stiffness simulation box; there is a horizontal level on the left side of each rigid block with a U-shaped groove. Pulling device; the horizontal pulling device pushes the retaining wall stiffness simulation box to cause displacement, and squeezes the soil in the foundation pit chamber to produce deformation.

As a further description of the above technical solution:

The material of the filling box is organic glass.

As a further description of the above technical solution:

The material of the rigid block with a U-shaped groove is plexiglass; on the sides where adjacent rigid blocks are in contact, a groove is opened on one side, and a bump is fixed on the other side, and the bump is placed on the corresponding side. in the groove and can move relatively in the front-to-back direction.

As a further description of the above technical solution:

The horizontal pulling device includes a loading box with an opening facing left. The loading box is provided with an air bag, a first partition, a second spring, a second partition, the first partition and a second partition from right to left. The partitions are all in a vertical position and can move left and right; a push rod is fixed on the left side of the second partition, and the left end of the push rod is hinged with a first hinged link, a second hinged link, a third hinged link, and a pneumatic link. Pressure bar; a triangular bracket is fixed above the left end surface of the loading box, and the upper middle position of the second hinged link is hinged to the left end of the triangular bracket; a positioning slot with an inverted U-shaped vertical section is fixed on the right side of the upper end surface of the loading box , the pneumatic pressure rod is placed in the slot and kept horizontally, the right end of the pneumatic pressure rod extends downward, and a vertical loading plate is fixed on the right end of the pneumatic pressure rod.

As a further description of the above technical solution:

The pneumatic pressure rod is provided with a scale.

As a further description of the above technical solution:

A miniature stress sensor is provided on the surface of the loading plate.

As a further description of the above technical solution:

There is a through hole on the right end of the loading box, and there is an air guide tube in the through hole. One end of the air guide tube is connected to the air bag, the other end of the air guide tube is connected to an air pump, and the air guide tube is equipped with a pressure gauge.

As a further description of the above technical solution:

A displacement sensor is provided on the surface of the soil filled in the foundation pit chamber.

As a further description of the above technical solution:

The left side of the rigid block with a U-shaped groove is provided with a plurality of housings distributed in a rectangular array. The left and right ends of the housing are open, and each horizontal pulling device is arranged in the corresponding housing.

To sum up, due to the adoption of the above technical solution, the beneficial effects of the present utility model are:

(1) In this utility model, the traditional jack loading device is replaced by a horizontal pulling device. Using air pressure to simultaneously control the pushing pressure on each horizontal pulling device is more convenient than using multiple groups of jacks to control and can be very accurate. Simulate the stress changes on the retaining wall inside the foundation pit, thereby inducing displacement changes in the retaining wall.

(2) In this utility model, the horizontal pulling device is set as a lever. The stroke of the driving end of the lever (i.e., the air bag) increases, and the force of the output end (i.e., the pneumatic pressure rod, loading plate) increases, so that the horizontal pulling device has a U-shaped The upper limit of the thrust of the slot's rigid block is increased to meet the loading force requirements and is more in line with actual working conditions.

(3) By adjusting the partition size of the rigid block with a U-shaped groove, the utility model can accurately simulate the displacement changes of each part of the retaining wall. The smaller the area of the rigid block, the more accurate the displacement changes of the retaining wall that can be simulated.

(4) By using the retaining wall stiffness simulation box, this utility model can simulate the stiffness changes of different retaining wall simulation materials. The retaining wall stiffness changes can be adjusted by replacing the first spring in the retaining wall stiffness simulation box.

(5) This utility model can not only simulate changes in the internal force of the soil behind the wall induced by changes in retaining wall displacement, but can also add adjacent building structures such as tunnel models, ground buildings and other structures to the foundation pit chamber to simulate the changes induced by foundation pit excavation. The displacement caused by adjacent structures is used to study the impact of foundation pit excavation on adjacent structures.

Description of drawings

Figure 1 is a schematic diagram of the three-dimensional structure of the utility model;

Figure 2 is a schematic diagram of the internal three-dimensional structure of the earth filling box 1 of the present utility model;

Figure 3 is a three-dimensional structural diagram of the retaining wall stiffness simulation box;

Figure 4 is a three-dimensional structural view of the rigid block 6 with a U-shaped groove;

Figure 5 is a three-dimensional structural view of the horizontal pulling device;

Figure 6 is an internal three-dimensional structural view of the horizontal pulling device.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all implementations. example. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present utility model.

Please refer to Figures 1-6. This utility model provides a technical solution for an array type air pressure driven retaining wall displacement simulation test system:

An array type air pressure driven retaining wall displacement simulation test system, including a filling box 1, a vertical back baffle 2 is provided in the filling box 1, so that the filling box 1 forms a vertical back baffle 2 on the rear side of the back baffle 2 The foundation pit chamber 3 is filled with soil; a plurality of first springs 4 distributed in a rectangular array are fixed on the front end of the rear baffle 2, and a rigid spring with a U-shaped groove is fixed on the front end of each first spring 4. Block 6, multiple rigid blocks 6 with U-shaped grooves are densely paved to form a front baffle 5 that is as large as the rear baffle 2; the right baffle 2, the first spring 4 and the front baffle 5 together form a retaining wall stiffness simulation box; each rigid block 6 with a U-shaped groove is provided with a horizontal pulling device on the left side; the horizontal pulling device pushes the retaining wall stiffness simulation box to cause displacement, and squeezes the soil in the foundation pit chamber 3 to produce deformation.

The material of the soil filling box 1 is organic glass.

The material of the rigid block 6 with a U-shaped groove is plexiglass; on the contact sides of the adjacent rigid blocks 6 with a U-shaped groove, a groove 7 is opened on one side, and a convex groove is fixed on the other side. Block 8, the protruding block 8 is placed in the corresponding groove 7 and can move in the front and rear direction.

The horizontal pulling device includes a loading box 9 with an opening facing left. The loading box 9 is provided with an air bag 10, a first partition 11, a second spring 12, and a second partition 13 from right to left. The first partition 11 and the second partition 13 are both in a vertical position and can move left and right; a push rod 14 is fixed on the left side of the second partition 13, and the left end of the transmission rod 14 is hinged with a first hinge link 15, The second hinged link 16, the third hinged link 17, and the pneumatic pressure rod 18; a triangular bracket 19 is fixed above the left end surface of the loading box 9, and the upper middle position of the second hinged rod 16 is hinged to the left end of the triangular bracket 19; There is a positioning slot 20 with an inverted U-shaped vertical section fixed on the right side of the upper end of the loading box 9. The pneumatic pressure rod 18 is placed in the slot and kept horizontal. The right end of the pneumatic pressure rod 18 extends downward, and the right end of the pneumatic pressure rod 18 is fixed. There is a vertical loading plate 21.

The pneumatic pressure rod 18 is provided with a scale.

The surface of the loading plate 21 is provided with micro stress sensors.

There is a through hole 22 on the right end of the loading box 9, and there is an air guide tube 23 in the through hole 22. One end of the air guide tube 23 is connected to the air bag 10, and the other end of the air guide tube 23 is connected to an air pump. The air guide tube 23 is provided with an air pump. Barometer 24.

A displacement sensor is provided on the surface of the soil filled in the foundation pit chamber 3.

The left side of the rigid block 6 with a U-shaped groove is provided with a plurality of housings 25 distributed in a rectangular array. The left and right ends of the housing 25 are open, and each horizontal pulling device is arranged in the corresponding housing 25.

working principle:

Before use, first fix the filling box 1 through the steel frame, and then put the retaining wall stiffness simulation box and the horizontal pulling device into the filling box 1 in sequence according to the required size of the foundation pit chamber 3, and then place it in the foundation pit chamber. 3. Fill the soil in layers and compact it, and arrange a displacement sensor on the surface of the filling soil; connect the horizontal pulling device and the air pump through the air conduit 23.

When in use, start the air pump and inflate the air bag 10 through the air tube 23. The air bag 10 expands and pushes the first partition 11 to move to the left. The second spring 12 drives the second partition 13 to move to the left, and then through the first hinge The connecting rod 15 drives the lower end of the second hinged link 16 to rotate to the left, the upper end of the second hinged link 16 to rotate to the right, and the third hinged link 17 drives the pneumatic pressure rod 18 and the loading plate 21 to move horizontally to the right. , the loading plate 21 pushes the rigid block 6 with a U-shaped groove to the right, and then adjusts the air pump output pressure according to the specific experimental conditions, thereby adjusting the horizontal displacement of the loading plate 21, so that the stress between the loading plate 21 and the retaining wall stiffness simulation box changes to simulate the displacement changes of the retaining wall in actual projects, thereby inducing deformation of the soil in the foundation pit chamber 3, specifically: the loading plate 21 squeezes the rigid block 6 with the U-shaped groove, and the compression first The spring 4 presses the back baffle 2 through a plurality of first springs 4, and presses the soil in the foundation pit chamber 3 through the back baffle 2 to cause deformation.

During the test, the displacement data that occurred during the loading process of the loading plate 21 was collected through the scale set on the positioning slot 20, that is, the displacement data of each rigid block 6 with a U-shaped groove; at the same time, through the soil in the foundation pit chamber 3 Displacement sensors arranged on the surface of the soil collect soil surface displacement data for comparison.

Through the displacement data collected in the actual project, the output air pressure of the air pump is adjusted to adjust the stress and displacement of each horizontal loading device, and finally achieve the change of retaining wall displacement required for the test. Through the above operations, the retaining wall displacement can be simulated Changes induce the displacement and internal force changes of the soil behind the retaining wall; by observing the deformation of the soil in the soil chamber, the actual deformation and settlement of the soil can be estimated.

It is worth noting that considering that the force required to induce deformation of the soil in the test is relatively large, in order to meet the demand, in this utility model, a horizontal loading device is set to form a lever, and the stroke of the driving end of the lever (i.e., the air bag 10) is increased, and the output The strength of the ends (i.e., the pneumatic pressure rod 18 and the loading plate 21) increases, so that the upper limit of the thrust force of the horizontal pulling device on the rigid block 6 with the U-shaped groove increases to meet the loading force requirements.

The above are only preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Persons familiar with the technical field shall, within the technical scope disclosed by the present utility model, implement the present utility model according to Any equivalent substitution or change of the technical solution and the concept of the utility model shall be covered by the protection scope of the present utility model.

Claims (9)

1. An array-type pneumatic retaining wall displacement simulation test system, which is characterized in that it includes a filling box (1), and the filling box (1) is provided with a vertical back baffle (2), A foundation pit chamber (3) is formed in the filling box (1) on the rear side of the rear baffle (2), and soil is filled in the foundation pit chamber (3); a rectangular array distribution is fixed on the front end surface of the rear baffle (2) There are a plurality of first springs (4). A rigid block (6) with a U-shaped groove is fixed at the front end of each first spring (4). The front baffle (5) is sealed by a rigid block (6) with a U-shaped groove. The back baffle (2), the first spring (4) and the front baffle (5) together form a retaining wall stiffness simulation box; each rigid block (6) with a U-shaped groove is equipped with a A horizontal pulling device; the horizontal pulling device pushes the retaining wall stiffness simulation box to cause displacement, and squeezes the soil in the foundation pit chamber (3) to produce deformation. 2. An array type air pressure driven retaining wall displacement simulation test system according to claim 1, characterized in that the material of the earth filling box (1) is organic glass. 3. An array type air pressure driven retaining wall displacement simulation test system according to claim 1, characterized in that the material of the rigid block (6) with U-shaped groove is organic glass; the adjacent belt On the sides in contact with the rigid blocks (6) of the U-shaped groove, a groove (7) is provided on one side, and a convex block (8) is fixed on the other side, and the convex block (8) is placed in the corresponding groove ( 7) It can move in the front and rear directions. 4. An array type air pressure driven retaining wall displacement simulation test system according to claim 1, characterized in that the horizontal pulling device includes a loading box (9) with an opening facing left, and the loading box (9) ) is provided with an airbag (10), a first partition (11), a second spring (12), a second partition (13), a first partition (11) and a second partition (13) from right to left. 13) are in a vertical position and can move left and right; a push rod (14) is fixed on the left side of the second partition (13), and the left end of the push rod (14) is hinged with the first hinge connecting rod (15), the The second hinged link (16), the third hinged link (17), and the pneumatic pressure rod (18); a triangular bracket (19) is fixed above the left end surface of the loading box (9), and the second hinged link (16) The upper position in the middle is hinged to the left end of the tripod bracket (19); a positioning slot (20) with an inverted U-shaped vertical section is fixed on the right side of the upper end of the loading box (9), and the pneumatic pressure rod (18) is placed in the slot Inside and kept horizontal, the right end of the pneumatic pressure rod (18) extends downward, and a vertical loading plate (21) is fixed on the right end of the pneumatic pressure rod (18). 5. An array type pneumatically driven retaining wall displacement simulation test system according to claim 4, characterized in that the pneumatic pressure rod (18) is provided with a scale. 6. An array type air pressure driven retaining wall displacement simulation test system according to claim 4, characterized in that a micro stress sensor is provided on the surface of the loading plate (21). 7. An array type air pressure driven retaining wall displacement simulation test system according to claim 4, characterized in that the right end face of the loading box (9) has a through hole (22), and the through hole (22) ) has an air guide tube (23), one end of the air guide tube (23) is connected to the airbag (10), the other end of the air guide tube (23) is connected to an air pump, and the air guide tube (23) is provided with a pressure gauge (24). 8. An array type air pressure driven retaining wall displacement simulation test system according to claim 1, characterized in that a displacement sensor is provided on the surface of the soil filled in the foundation pit chamber (3). 9. An array type air pressure driven retaining wall displacement simulation test system according to claim 1, characterized in that the left side of the front baffle (5) is provided with a rectangular array distributed housing (25). The left and right ends of the body (25) are open, and the horizontal pulling device is arranged in the housing (25).