Soil body surface simulation pressurizing device for geotechnical model test

Abstract

The utility model discloses a soil engineering model test soil body surface simulation pressurizing device which comprises a test box body, a pressure box body and pressurizing equipment, and a to-be-tested soil body is arranged in the test box body; the pressure box body is arranged above the test box body and is communicated with an opening of the test box body, and a slurry layer is filled in the pressure box body and at the opening of the test box body; the pressurizing equipment is communicated with the interior of the pressure box body through a pipeline, and the pressurizing equipment is used for injecting compressed air with preset air pressure into the pressure box body; gas pressure is transmitted to the top of the test box body in a mode of forming a film on the surface of the test box body by mud, so that the pressure of a soil body in the test box body can reach the initial pressure of a stratum under a simulated working condition; uniform pressurization on the top of a model test can be achieved through the pressurization mode of mud and compressed air, and development of a mud or compressed air splitting channel under some test working conditions cannot be affected.

Description

Technical Field

[0001] This utility model relates to the field of underground engineering testing and experimental technology, specifically a soil surface simulation pressure device for geotechnical model testing. Background Technology

[0002] With the increasing demands of human socio-economic development, the construction of large-scale civil, transportation, water conservancy, and marine engineering projects is becoming more and more common, and the geological safety of engineering structures is attracting increasing attention. Among these, the safety of civil engineering structures and infrastructure under pressure is particularly prominent. Current geotechnical model testing devices are generally quite complex. Early methods applied pressure by stacking loads on top, such as stacking metal weights 2-4 meters high to apply 100-300 kPa of pressure, which was extremely dangerous and inconvenient. Later methods used massive reaction frames to apply test pressure, but this significantly increased manufacturing costs for general model testing devices and occupied excessively large testing sites. Therefore, there is an urgent need for a geotechnical model testing device that simulates pressure on the soil surface to solve these problems. Utility Model Content

[0003] The purpose of this invention is to provide a device for simulating pressure on the surface of soil in geotechnical model tests, which can effectively solve the problem.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a soil surface simulation pressure device for geotechnical model tests, comprising:

[0005] The test chamber has an opening at the top, and the test chamber contains the soil to be tested.

[0006] A pressure chamber is installed above the test chamber and communicates with the opening of the test chamber. The pressure chamber is filled with a mud layer at the opening of the test chamber.

[0007] A pressurizing device is connected to the pressure chamber via a pipeline, and the pressurizing device is used to inject compressed air at a preset pressure into the pressure chamber.

[0008] Preferably, the test chamber opening edge is provided with a chamber edge cover, the pressure chamber is a chamber structure with openings at both ends, the bottom opening of the pressure chamber is connected to the opening of the test chamber, and the top opening of the pressure chamber is closed by a top cover; and the top cover and the chamber edge cover are connected by a number of connecting bolts.

[0009] Preferably, the top cover has a pre-set through hole that connects to the interior of the pressure chamber, and the pipe is sealed to the through hole.

[0010] Preferably, the through hole is arranged vertically to the mud layer, and the through hole guides the compressed air to vertically pressurize the mud layer.

[0011] Preferably, a rubber sealing ring is embedded between the opening at the bottom end of the pressure box and the opening of the test box.

[0012] Preferably, the pressurizing device comprises a pressure stabilizer and an air compressor, and the output end of the air compressor is connected to the through hole through the pressure stabilizer via a pipeline.

[0013] Beneficial effects: The test device can transfer the gas pressure to the top of the test box by forming a film of mud on the surface of the test box, so that the pressure of the soil in the test box can reach the initial pressure of the stratum under the simulated working condition; the loading method of mud + compressed air greatly improves the convenience and economy of the pressurizing device, and does not affect the development of the mud or compressed air splitting channel under certain test conditions; the device can conveniently realize the initial ground stress of the soil in the model test box, and has important significance for the development of model test. BRIEF DESCRIPTION OF DRAWINGS

[0014] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, illustrate the present application and are used to explain the present application together with the embodiments of the present application, and do not constitute a limitation on the present application.

[0015] In the drawings:

[0016] Figure 1 is a structural schematic view of the simulated pressurizing device of the present application;

[0017] Reference numerals in the drawings: 1, test box; 2, soil to be tested; 3, pressure box; 4, mud layer; 5, box edge cover; 6, top cover; 7, through hole; 8, connecting bolt; 9, compressed air; 10, pressure stabilizer; 11, air compressor; 12, pipeline. DETAILED DESCRIPTION

[0018] In order to make the purpose and advantages of the present application more clear and explicit, the present application will be specifically described below in combination with embodiments. It should be understood that the following text is only used to describe a soil model test soil surface simulated pressurizing device or several specific embodiments of the present application, and does not strictly limit the protection scope of the present application.

[0019] Embodiment: as shown in the figure, a soil model test soil surface simulated pressurizing device comprises: Figure 1

[0020] ​The test box body 1 is arranged at the bottom, the test box body 1 is internally provided with the soil body 2 to be measured, the top end of the test box body 1 is arranged as an opening, and the soil body 2 to be measured is filled to the opening;

[0021] A pressure box body 3 is mounted above the test box body 1, the bottom opening of the pressure box body 3 is communicated with the opening of the test box body 1, the prepared bentonite mud is poured into the pressure box body 3, so that a mud layer 4 is formed in the pressure box body 3 at the opening of the test box body 1, and the mud quickly forms a dense mud film on the top of the soil body;

[0022] A pressurizing device is arranged on one side of the pressure box body 3, the pressurizing device is communicated with the pressure box body 3 through a pipeline 12, and the pressurizing device is used for injecting compressed air 9 of a preset air pressure into the pressure box body 3.

[0023] Based on the above, during the test, the compressed air 9 of the preset air pressure is injected through the pressurizing device, and the gas pressure is accurately transmitted to the top of the model box through the dense mud film formed by the mud layer 4, so that the pressure of the soil body of the model box can reach the initial pressure of the stratum under the simulated working condition; through the loading mode of the mud + compressed air 9, the uniform pressurization can be realized at the top of the model test.

[0024] Based on the above, for the assembly of the pressure box body 3 and the test box body 1, reference is made to Figure 1 in the embodiment, the opening edge of the test box body 1 is provided with a box edge cover 5, the pressure box body 3 is a box structure with two open ends, the bottom end opening of the pressure box body 3 is communicated with the opening of the test box body 1, and the top end opening of the pressure box body 3 is covered by a top cover 6; and the top cover 6 and the box edge cover 5 are connected through a plurality of connecting bolts 8, so that the device is more convenient to disassemble and install.

[0025] In addition, as shown in Figure 1 in the embodiment, a through hole 7 communicating the inside of the pressure box body 3 is further provided on the top cover 6, and the pipeline 12 is sealingly connected with the through hole 7, so as to facilitate the assembly and disassembly of the pipeline 12.

[0026] In the embodiment, a rubber sealing ring is embedded between the bottom end opening of the pressure box body 3 and the opening of the test box body 1, so as to improve the accuracy of pressure transmission and avoid leakage of the mud and air,

[0027] Further, as shown in Figure 1 in the embodiment, the through hole 7 is vertically arranged with the mud layer 4, and the through hole 7 guides the compressed air 9 to vertically press on the mud layer 4, so as to guide the compressed air 9 to better transmit to the surface of the mud film.

[0028] Preferably, as shown in Figure 1As shown, the pressurizing device in the embodiment includes a pressure stabilizer 10 and an air compressor 11, the output end of the air compressor 11 is connected with the through hole 7 through the pipeline 12 and the pressure stabilizer 10, the set gas pressure is reached by adjusting the pressure stabilizer 10, the valve of the pressure stabilizing device is opened to inject the compressed air 9 into the pressure box 3, and the pressurizing of the model test box is easily and conveniently completed.

[0029] The embodiment of the utility model is described in detail in combination with the drawings above, but the utility model is not limited to the above-mentioned embodiment, for the ordinary skilled in the art, after knowing the content recorded in the utility model, under the premise of not departing from the principle of the utility model, still can make several equal transformation and replacement, these equal transformation and replacement also should be regarded as belonging to the protection scope of the utility model.

Claims

1. A soil surface pressure simulation device for geotechnical model tests, characterized in that, The utility model relates to a kind of soil pressure test device, including: Test box (1), top end is open, and the test box (1) inside is provided with to be measured soil body (2); Pressure box (3), installation is in the test box (1) top, and with the opening of the test box (1) intercommunication, the pressure box (3) is filled with mud layer (4) in the opening of the test box (1) inside; Pressurizing equipment, by pipeline (12) with the pressure box (3) inside intercommunication, the pressurizing equipment is used to inject the compressed air (9) of preset air pressure in the pressure box (3).

2. The soil surface pressurization device for geotechnical model tests according to claim 1, characterized in that: The test box (1) opening edge is provided with box edge cover (5), the pressure box (3) is a kind of two-end open box structure, the bottom opening of the pressure box (3) with the opening of the test box (1) intercommunication, the top opening of the pressure box (3) is covered by top cover (6);And, the top cover (6) and box edge cover (5) are connected by several connecting bolts (8).

3. The device for simulating the surface pressure of soil in a geotechnical model test according to claim 2, wherein: The top cover (6) is provided with through-hole (7) that communicates the inside of pressure box (3), the pipeline (12) and the through-hole (7) are sealedly connected.

4. The device for simulating the surface pressure of soil in a geotechnical model test according to claim 3, wherein: The through-hole (7) is vertically arranged with mud layer (4), and the through-hole (7) guides compressed air (9) and vertically pressurizes on the mud layer (4).

5. The device for simulating the surface pressure of soil in a geotechnical model test according to claim 2, wherein: The bottom opening of the pressure box (3) and the opening between the test box (1) are embedded rubber sealing ring.

6. The device for simulating the surface pressure of soil in a geotechnical model test according to claim 3, wherein: The pressurizing equipment includes pressure stabilizer (10) and air compressor (11), and the output end of the air compressor (11) is connected with the through-hole (7) through pipeline (12) and pressure stabilizer (10).

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