Test device for simulating rock-socketed and stressed deformation of foundation pit support structure

Abstract

The utility model relates to the field of foundation pit support structure tests, and discloses a test device for simulating rock-socketed and stressed deformation of a foundation pit support structure, which comprises a flexible test element, a build-in part, a flexible water stop part and a retaining structure, the retaining structure and the flexible water stop part are respectively arranged at the upper end and the lower end of the build-in part, and the flexible water stop part is arranged at the lower end of the build-in part. The built-in part is provided with a movable part of which the height can be adjusted up and down for mounting the supporting and retaining structure, the flexible test element is laid on the surface of the supporting and retaining structure, the flexible test element can cooperatively deform with the supporting and retaining structure, and the flexible test element is used for collecting deformation data of the supporting and retaining structure. The supporting conditions under various geological conditions and foundation pit depths can be simulated by simply adjusting the bolt and the flexible water stop part, the test cost is effectively reduced, the test efficiency and the data accuracy are improved, and a reliable rock-socketed and stress deformation test scheme is provided for similar foundation pit supporting model tests.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit retaining structure testing, and in particular to a test device for simulating the rock embedment and stress deformation of foundation pit retaining structures. Background Technology

[0002] In the research of foundation pit support technology, model testing is an important means to explore the mechanical properties of foundation pit support structures and verify the feasibility of design schemes. With the continuous development of foundation pit support technology, higher requirements are placed on the accuracy, flexibility, and repeatability of model tests.

[0003] Existing foundation pit support model testing devices generally suffer from the following defects:

[0004] 1. Limited adjustability and insufficient versatility: Most devices have a fixed embedment depth, making it impossible to simulate different geological conditions (such as differences in permeability coefficients) and embedment depths of retaining structures on the same test platform. Test personnel need to frequently replace the entire set of devices, which significantly increases test costs. Furthermore, the operation process is cumbersome, prone to human error, and seriously affects the accuracy of test data.

[0005] 2. Defects in the stability of rock embedment of the support: The connection between the existing device and the model box is not stable enough. When simulating complex load conditions (such as soil lateral pressure and groundwater seepage force), the device is prone to loosening and displacement, making it difficult to truly reflect the actual stress state of the foundation pit support structure. In addition, foundation pit model tests generally use sand layers, which have small passive zone constraints and insufficient embedment effect on the support structure, which seriously restricts the reliability and effectiveness of the model test.

[0006] 3. Limited functionality of stress deformation testing devices: Traditional devices cannot meet diverse testing needs. Conventional deformation monitoring elements have poor deformation coordination with the support structure and cannot directly obtain macroscopic deformation results, resulting in insufficient data acquisition and conversion accuracy. It is difficult to restore the true spatial deformation morphology of the support structure and to achieve accurate monitoring and automated data acquisition of the micro-deformation of the support structure.

[0007] To address the aforementioned issues, a test device for simulating the rock embedment and stress deformation of foundation pit retaining structures needs to be developed. This device should be able to quickly adjust the embedment depth, stably connect the model box, adapt to various geological conditions, and possess high-sensitivity deformation monitoring capabilities. This is an urgent need to improve the quality of model tests and promote the research and development of foundation pit support technology. Utility Model Content

[0008] The purpose of this invention is to provide a test device for simulating the rock embedment and stress deformation of foundation pit retaining structures to solve the above problems. The specific technical solution is as follows:

[0009] A test device for simulating the rock embedment and stress deformation of a foundation pit retaining structure includes a flexible test element, an embedded part, a flexible water-stopping part, and a support structure. The support structure and the flexible water-stopping part are respectively disposed at the upper and lower ends of the embedded part. The embedded part is provided with a movable part that can be adjusted vertically for installing the support structure. The flexible test element is laid on the surface of the support structure. The flexible test element can deform in tandem with the support structure, and the flexible test element is used to collect the deformation data of the support structure.

[0010] As an improvement to the above technical solution, the flexible testing element includes several low-stiffness linear testing units, which are arranged in a grid pattern on the surface of the support structure.

[0011] As an improvement to the above technical solution, the fixing part includes an angle steel, which has a horizontal section and a vertical section. The movable part includes a fixing bolt. Several fixing bolts are connected to the horizontal section and arranged along its length. A clamping plate is connected between two adjacent fixing bolts. The clamping plate cooperates with the vertical section of the angle steel to clamp the support structure.

[0012] As an improvement to the above technical solution, the clamping part includes a connecting plate and a clamping plate. The connecting plate is connected to the fastening bolt, and an adjusting bolt is threaded onto the connecting plate. The end of the adjusting bolt abuts against the clamping plate.

[0013] As an improvement to the above technical solution, the angle steel is connected to angle brackets at both ends, and through holes are provided at both ends of the vertical section of the angle steel. The through holes are rounded rectangles, and the angle brackets are provided with mounting holes. A first bolt is connected between the through holes and the mounting holes.

[0014] As an improvement to the above technical solution, the fastening bolt is provided with scale markings.

[0015] As an improvement to the above technical solution, the inner side of the clamping plate is provided with a rubber layer.

[0016] As an improvement to the above technical solution, the flexible waterstop is provided with a number of openings to change the permeability of the flexible waterstop.

[0017] As an improvement to the above technical solution, it also includes a model box, wherein the fixing part is disposed inside the model box, the corner bracket is provided with a second bolt, and the model box is provided with a plurality of connection holes at different heights, and the second bolt is connected to the connection holes.

[0018] The beneficial effects of this invention are as follows: This device can quickly adapt to different foundation pit support structure rock embedding and stress model test conditions. By simply adjusting the bolts and flexible water-stopping parts, it can simulate the support conditions under various geological conditions and foundation pit depths, effectively reducing test costs, improving test efficiency and data accuracy, and providing a reliable rock embedding and stress deformation test scheme for similar foundation pit support model tests.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Of course, implementing any product or method of this application does not necessarily require achieving all of the advantages described above at the same time. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] Figure 2 This is a schematic diagram of the embedded part of this utility model.

[0023] Figure 3 This is a schematic diagram of the corner bracket of this utility model.

[0024] Figure 4 This is a schematic diagram of the inner wall structure of the model box of this utility model.

[0025] In the figure: 1. Flexible test element; 2. Embedded part; 3. Flexible water-stopping part; 4. Support structure; 5. Angle bracket; 21. Angle steel; 22. Embedded bolt; 23. Connecting plate; 24. Clamping plate; 25. Rubber layer; 26. Adjusting bolt; 51. Second bolt; 6. Model box. Detailed Implementation

[0026] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] Please see Figures 1-4In this embodiment of the present invention, a test device for simulating the rock embedment and stress deformation of a foundation pit retaining structure is provided. This test device is suitable for working conditions where the uniaxial saturated compressive strength of the rock stratum is >30MPa (harder rock). Specifically, it includes a flexible test element 1, an embedded part 2, a flexible water-stopping part 3, and a support structure 4. The support structure 4 and the flexible water-stopping part 3 are respectively set at the upper and lower ends of the embedded part 2. The embedded part 2 is provided with a movable part that can be adjusted vertically for installing the support structure 4. The flexible test element 1 is laid on the surface of the support structure 4. The flexible test element 1 can deform in tandem with the support structure 4, and the flexible test element 1 is used to collect the deformation data of the support structure 4.

[0028] Regarding the flexible testing element 1, specifically, the flexible testing element includes several low-stiffness linear testing units, which are crisscrossed on the surface of the support structure 4 to form a grid. In this embodiment, a corresponding computing system or control system will also be used in conjunction with it, and the flexible testing element 1 will be connected to the computing system via signal connection. The data collected by the flexible testing element 1 will be output to the computing system or control system, and it can deform synchronously with the support structure 4 to ensure the authenticity and integrity of the deformation data, multi-point measurement capability, and improved spatial resolution. Preferably, the flexible testing element 1 adopts a three-vertical and four-horizontal grid distribution, but it can also be arranged in other grid channel forms. The flexible testing element 1 can read the deformation curve through image data extraction software, and then output the spatial deformation form and mechanical analysis results of the support structure 4 based on the reading results and test results.

[0029] In some embodiments, the fastening part 2 includes an angle steel 21, which has a horizontal section and a vertical section. The movable part includes a fastening bolt 22. A plurality of fastening bolts 22 arranged along the length direction are connected to the horizontal section. A clamping plate 24 is connected between two adjacent fastening bolts 22. The clamping plate 24 cooperates with the vertical section of the angle steel 21 to clamp the support structure 4. The clamping part includes a connecting plate 23 and a clamping plate 24. The connecting plate 23 is connected to the fastening bolt 22. An adjusting bolt 26 is threadedly connected to the connecting plate 23. The end of the adjusting bolt 26 abuts against the clamping plate 24.

[0030] The embedding depth can be adjusted by changing the length of the bottom embedding bolt 22 and the height of the angle steel 21. Generally, the angle steel 21 is equipped with a nut to cooperate with the embedding bolt 22. In addition, the embedding part 2 can also twist the adjusting bolt 26 at the connecting plate 23 to flexibly adjust the thickness of the support structure 4.

[0031] In some embodiments, angle steel 21 is connected to angle brackets 5 at both ends, and both ends of the vertical section of angle steel 21 are provided with through holes, which are rounded rectangles. The angle brackets 5 are provided with mounting holes, and a first bolt is connected between the through holes and the mounting holes. The fastening part 2 adapts to the length of different support structures 4 by changing the position of the first bolt on the outside.

[0032] Preferably, the fastening bolt 22 is provided with scale markings, which can be used to intuitively display and adjust the fastening depth, making it convenient for staff to operate.

[0033] To ensure better clamping effect, in some embodiments, the inner side of the clamping plate 24 is provided with a rubber layer 25, which contacts the support structure 4 to prevent slipping and fix the device, thereby enhancing its stability.

[0034] In some embodiments, the flexible waterstop 3 has a plurality of openings to alter its permeability. Specifically, the flexible waterstop 3 is made of a flexible waterstop material and is perforated. The number and size of the openings on the flexible waterstop 3 are adjusted to simulate the actual permeability coefficient of the rock strata. The permeability of the flexible waterstop 3 is determined experimentally. When the permeability coefficient of the simulated rock strata is below 10... -7 cm / s, a non-perforated flexible waterstop can be used 3.

[0035] In addition, this device is applied inside the model box 6. The fixing part 2 is set inside the model box 6. The corner bracket 5 is provided with a second bolt 51. The model box 6 is provided with several connection holes at different heights. The second bolt 51 is connected to the connection holes.

[0036] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A test device for simulating the rock-embedded and stress-deformed structure of a foundation pit retaining structure, characterized in that, The device includes a flexible testing element, a fixed part, a flexible water-stopping part, and a support structure. The support structure and the flexible water-stopping part are respectively disposed at the upper and lower ends of the fixed part. The fixed part is provided with a movable part that can be adjusted vertically for mounting the support structure. The flexible testing element is laid on the surface of the support structure. The flexible testing element can deform in tandem with the support structure and is used to collect deformation data of the support structure.

2. The experimental device for simulating rock embedment and stress deformation of foundation pit retaining structures according to claim 1, characterized in that: The flexible testing element includes several low-stiffness linear testing units, which are arranged in a grid pattern on the surface of the support structure.

3. The experimental device for simulating rock embedment and stress deformation of foundation pit retaining structures according to claim 2, characterized in that: The fixing part includes an angle steel, which has a horizontal section and a vertical section. The movable part includes a fixing bolt. Several fixing bolts are connected to the horizontal section and arranged along its length. A clamping plate is connected between two adjacent fixing bolts. The clamping plate cooperates with the vertical section of the angle steel to clamp the support structure.

4. The experimental device for simulating rock embedment and stress deformation of foundation pit retaining structures according to claim 3, characterized in that: The clamping part includes a connecting plate and a clamping plate. The connecting plate is connected to the fastening bolt, and an adjusting bolt is threaded onto the connecting plate. The end of the adjusting bolt abuts against the clamping plate.

5. The experimental device for simulating rock embedment and stress deformation of foundation pit retaining structures according to claim 3, characterized in that: Angle brackets are connected to both ends of the angle steel. Both ends of the vertical section of the angle steel are provided with through holes. The through holes are rounded rectangles. The angle brackets are provided with mounting holes. A first bolt is connected between the through holes and the mounting holes.

6. The experimental device for simulating rock embedment and stress deformation of foundation pit retaining structures according to claim 3, characterized in that: The fastening bolts are marked with scale markings.

7. The experimental device for simulating rock embedment and stress deformation of foundation pit retaining structures according to claim 6, characterized in that: The inner side of the clamping plate is provided with a rubber layer.

8. The experimental device for simulating rock embedment and stress deformation of foundation pit retaining structures according to claim 7, characterized in that: The flexible waterstop has several openings to change its permeability.

9. The experimental device for simulating rock embedment and stress deformation of foundation pit retaining structures according to claim 5, characterized in that: It also includes a model box, the fastening part is disposed inside the model box, the corner bracket is provided with a second bolt, the model box is provided with a number of connection holes at different heights, and the second bolt is connected to the connection holes.

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