A model device for local leakage in deep foundation pit retaining structures

Abstract

This utility model relates to the field of foundation pit support technology, specifically to a local leakage model device for deep foundation pit support structures. It includes a main test chamber, a test chamber frame, a water and sand collection system, a data acquisition system, and leakage unit components. The main test chamber includes a foundation pit soil layer zone and a water level control zone. The local leakage model device for deep foundation pit support structures provided by this utility model can simulate local leakage tests of foundation pit support structures considering various factors such as soil sample type, water head pressure, and different leakage conditions. The foundation pit soil layer zone simulates different soil samples and soil layers at different burial depths; the water level control zone simulates working conditions with different water levels in the foundation pit soil layer; and different leakage units in the leakage unit components simulate different leakage outlet types and sizes.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit support technology, specifically to a local leakage model device for deep foundation pit support structures. Background Technology

[0002] In deep foundation pit engineering, leakage in the retaining structure is a key risk source leading to soil erosion, subsidence of surrounding strata, and even structural instability. Especially under complex geological conditions such as water-rich sand layers and soft soil, localized leakage can rapidly expand into overall seepage failure, seriously threatening project safety. Traditional leakage monitoring mainly relies on on-site observation and numerical simulation. However, on-site measurements are limited by environmental constraints and cannot capture the dynamic evolution of leakage, while numerical models, due to parameter simplification, cannot accurately reflect the actual leakage failure modes and patterns.

[0003] In recent years, model testing has become an important means of studying the leakage mechanism of retaining structures. However, existing model testing devices often have the following shortcomings: the water level conditions are simulated in a single way, and it is impossible to reproduce the simulation of soil layers under different water level conditions; the adaptability of leakage scenarios is poor, and there is a lack of fine simulation and dynamic adjustment of different leakage locations, leakage outlet properties and sizes of retaining structures; the monitoring methods are limited, and there is a lack of visualization and quantitative observation methods, which makes it difficult to capture the soil particle erosion and damage mechanism.

[0004] In summary, there is an urgent need for a model device for local leakage in deep foundation pit retaining structures to solve the problems existing in the current technology. Utility Model Content

[0005] The purpose of this utility model is to provide a model device for local leakage in deep foundation pit retaining structures. The specific technical solution is as follows:

[0006] A local leakage model device for deep foundation pit retaining structure includes a main test chamber, a water and sand collection system, a data acquisition system, and leakage unit components;

[0007] The main test chamber includes a foundation pit soil layer zone and a water level control zone. An interlayer is provided between the foundation pit soil layer zone and the water level control zone. The side plate of the foundation pit soil layer zone is provided with upper and lower seepage outlets of different heights. The water level control zone is used to regulate the water level in the foundation pit soil layer zone.

[0008] The water and sand collection system includes a diversion channel and a water and sand collection box. The diversion channel is used to divert water and sand leaking from the upper or lower seepage outlet, and the water and sand collection box is used to receive the water and sand diverted by the diversion channel.

[0009] The data acquisition system includes a weight sensor, a flow sensor, and a vision sensor. The weight sensor is used to detect changes in the mass of the water and sand collection box. The flow sensor is installed on the guide channel. The vision sensor is installed in front of and above the main test chamber to collect image information on soil erosion evolution and deformation.

[0010] The leakage unit assembly includes multiple leakage components and a plug. The leakage components are installed to match the upper and lower leakage ports. Different leakage components are used to simulate different leakage port types. The plug is used to seal the upper or lower leakage port.

[0011] Optionally, the side panels and bottom plate of the main test chamber are made of transparent material, and the side panels are used to simulate the retaining structure of the foundation pit.

[0012] Optionally, the transparent material is transparent acrylic glass.

[0013] Optionally, the side plate of the water level control area is provided with an inlet and an outlet, the inlet is connected to a water pump, and both the inlet and the outlet are provided with valves.

[0014] Optionally, the deep foundation pit retaining structure local leakage model device further includes a test chamber frame, which includes a top cover plate, reinforcing angle steel and a base. The main test chamber is set on the base, and the side plates and bottom plates of the main test chamber are connected by reinforcing angle steel. The top cover plate is set above the main test chamber and is detachably connected to the reinforcing angle steel.

[0015] Optionally, the spacer layer includes a porous glass plate and a transparent gauze, wherein the porous glass plate has uniformly arranged circular holes of the same size, and the transparent gauze covers the porous glass plate.

[0016] Optionally, waterproof silicone sealant is provided at the connection between the side plate and the bottom plate of the main test chamber, and waterproof silicone sealant is provided at the water inlet and outlet.

[0017] Optionally, the weight sensor is an electronic scale, the flow sensor is a flow meter, and the vision sensor is a camera.

[0018] Optionally, the leakage component is provided with through holes of different shapes and sizes. The through holes on the leakage component include rectangular, square and circular shapes, and the through holes are used to simulate different leakage outlet types.

[0019] The application of the technical solution of this utility model has the following beneficial effects:

[0020] This invention provides a local leakage model device for deep foundation pit retaining structures. Through the cooperation of a water level control zone, a data acquisition system, and leakage unit components, it can simulate local leakage tests of foundation pit retaining structures considering various factors such as soil type, water head pressure, and different leakage conditions. The foundation pit soil layer zone simulates different soil samples and soil layers at different burial depths; the water level control zone simulates working conditions with different water levels in the foundation pit soil layer; different leakage units in the leakage unit components simulate different leakage outlet types and sizes; and the different positions of the upper and lower leakage outlets simulate different leakage locations.

[0021] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0023] Figure 1 This is a schematic diagram of the local leakage model device for the deep foundation pit retaining structure in a preferred embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the main test chamber in a preferred embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the rear panel of the water supply tank in a preferred embodiment of this utility model;

[0026] Figure 4 This is a schematic diagram of the porous glass plate in a preferred embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the installation of the leakage unit component and the foundation pit retaining structure in a preferred embodiment of this utility model.

[0028] The components are as follows: 1-Main test chamber; 1.1-Soil layer zone of the foundation pit; 1.1.1-Foundation pit retaining structure; 1.1.2-Upper seepage outlet; 1.1.3-Lower seepage outlet; 1.2-Water level control zone; 1.2.1-Rear plate of water supply tank; 1.2.2-Water inlet; 1.2.3-Drain outlet; 1.2.4-Porous glass plate; 2-Test chamber frame; 2.1-Upper cover plate; 2.2-Reinforcing angle steel; 2.3-Base; 3-Water and sand collection system; 3.1-Drainage channel; 3.2-Water and sand collection box; 4-Data acquisition system; 4.1-Electronic scale; 4.2-Flow meter; 5-Leakage unit assembly; 5.1-Leakage unit; 5.2-Plug; 5.3-Through hole. Detailed Implementation

[0029] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered by the claims.

[0030] Example:

[0031] See Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 This embodiment provides a local leakage model device for deep foundation pit retaining structure, including a main test chamber 1, a test chamber frame 2, a water and sand collection system 3, a data acquisition system 4, and a leakage unit component 5. The local leakage model device for deep foundation pit retaining structure provided in this embodiment can realize simulation tests of local leakage of foundation pit retaining structure considering various factors such as soil sample type, water head pressure, and different leakage conditions.

[0032] Furthermore, the side panels and bottom plate of the main test chamber 1 are both made of transparent material. The main test chamber 1 includes a foundation pit soil layer area 1.1 and a water level control area 1.2, with a spacer layer between the foundation pit soil layer area 1.1 and the water level control area 1.2. In this embodiment, the preferred transparent material is transparent plexiglass.

[0033] In this embodiment, the spacer layer includes a porous glass plate 1.2.4 and a transparent gauze. The porous glass plate 1.2.4 has evenly distributed circular holes of the same size, and the transparent gauze covers the porous glass plate 1.2.4. In this embodiment, the preferred diameter of the circular holes is 8 mm, and the spacing between the holes is 30 mm.

[0034] Furthermore, the side plate of the foundation pit soil layer zone 1.1 is used to simulate the foundation pit retaining structure 1.1.1, which has upper seepage outlets 1.1.2 and lower seepage outlets 1.1.3 at different heights. The side plate of the water level control zone 1.2 forms the rear plate 1.2.1 of the water supply tank, which has an inlet 1.2.2 and an outlet 1.2.3. The inlet 1.2.2 is connected to a water pump, and both the inlet 1.2.2 and the outlet 1.2.3 are equipped with valves. It should be noted that the inlet 1.2.2 is located above the rear plate 1.2.1 of the water supply tank, and the outlet 1.2.3 is located below the rear plate 1.2.1 of the water supply tank. The valves on the inlet 1.2.2 and the outlet 1.2.3 are used to control the water inflow or outflow, thereby achieving water level regulation.

[0035] In this embodiment, waterproof silicone sealant is provided at the connection between the side plate and the bottom plate of the main test chamber 1, and waterproof silicone sealant is provided at the water inlet 1.2.2 and the water outlet 1.2.3.

[0036] Furthermore, the test chamber frame 2 includes an upper cover plate 2.1, a reinforcing angle steel 2.2, and a base 2.3. The main test chamber 1 is mounted on the base 2.3. The side plates and bottom plates of the main test chamber 1 are connected by the reinforcing angle steel 2.2. The upper cover plate 2.1 is mounted above the main test chamber 1 and is detachably connected to the reinforcing angle steel 2.2.

[0037] In this embodiment, the upper cover plate 2.1 is connected to the reinforcing angle steel 2.2 by bolts, which facilitates disassembly.

[0038] Furthermore, the water and sand collection system 3 includes a guide channel 3.1 and a water and sand collection box 3.2. The guide channel 3.1 is used to guide the water and sand leaking from the upper seepage port 1.1.1 or the lower seepage port 1.1.2, and the water and sand collection box 3.2 is used to receive the water and sand guided by the guide channel 3.1.

[0039] It should be noted that in this embodiment, the main test chamber 1 is raised by the base 2.3, and the height of the upper leakage port 1.1.2 and the lower leakage port 1.1.3 on the main test chamber 1 are both higher than the water and sand collection box 3.2.

[0040] Furthermore, the data acquisition system 4 includes a weight sensor, a flow sensor, and a vision sensor. The weight sensor is used to detect the mass change of the water and sand collection box 3.2. The flow sensor is set on the guide channel 3.1. The vision sensor is set in front of and above the main test chamber 1 to collect image information of soil erosion evolution and deformation.

[0041] In this embodiment, the weight sensor is an electronic scale 4.1, the flow sensor is a flow meter 4.2, and the vision sensor is a camera. The electronic scale 4.1 is positioned below the water and sand collection tank 3.2 to record the changes in its reading in real time. The flow meter 4.1 is installed on the guide channel 3.1 to record the loss rate of water and sand during seepage in real time. The cameras are respectively arranged in front of and above the main test chamber 1 to collect image information on soil erosion evolution and deformation. The captured image information can be transmitted to a computer for analysis and processing.

[0042] Furthermore, the leakage unit assembly 5 includes multiple leakage components 5.1 and plugs 5.2. The leakage components 5.1 are installed to match the upper leakage port 1.1.1 and the lower leakage port 1.1.2. Different leakage components are used to simulate different leakage port types. The plugs are used to block the upper leakage port or the lower leakage port.

[0043] In this embodiment, the leaking component 5.1 is provided with through holes 5.3 of different shapes and sizes. The through holes 5.3 on the leaking component 5.1 include rectangular, square, and circular shapes, and the through holes 5.3 are used to simulate different types of leaks. It should be noted that in this embodiment, both the leaking component 5.1 and the plug 5.2 can be installed to match the upper leak 1.1.1 or the lower leak 1.1.2. After installation, in this embodiment, waterproof tape is wrapped around the leaking component 5.1 or the plug 5.2 to ensure that the leaking component 5.1 and the plug 5.2 pass the waterproof test.

[0044] The following is a simulation test of local leakage in the foundation pit retaining structure using the device described in this embodiment:

[0045] 1) Install leakage plugs 5.1 at the upper leakage port 1.1.2 and the lower leakage port 1.1.3 of the main test chamber 1, use the corresponding plugs 5.2 to block the leakage ports, and seal them with glass glue or wrap them with waterproof tape for waterproofing.

[0046] 2) Open the water valve at the inlet 1.2.2 and connect it to the water level control area 1.2 to fill the main test chamber 1 with water and let it stand for 10 minutes to ensure that no water overflows from the main test chamber 1. Install the guide channel 3.1, the water and sand collection box 3.2, the electronic scale 4.1, and the camera in front of the upper leakage port 1.1.2.

[0047] 3) Fill the soil sample into the soil layer box 1.1 of the foundation pit, open the water valve at the water inlet 1.2.2, inject water to the target water level, let it stand for no less than 30 minutes, and replenish water to the water level control area 1.2 in real time to ensure that the soil sample is fully saturated with water.

[0048] 4) Remove the plug 5.2 and begin the leakage simulation. Water and soil particles enter the water and sand collection box 3.2 through the diversion channel 3.1. Replace the water and sand collection box 3.2 every 1 minute and record the changes in the readings of the electronic scale 4.1 and the flow meter 4.2.

[0049] 5) After the experiment, the water and sand collected in the water and sand collection box 3.2 were separated, and the water and sand leakage rates, water leakage rates, and sand leakage rates were recorded for each time period. Image post-processing techniques such as PIVlab were used to analyze and process the soil sample leakage process captured by the image acquisition system to explore the flow deformation of water and sand particles.

[0050] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A model device for localized leakage in deep foundation pit retaining structures, characterized in that, It includes a main test chamber (1), a water and sand collection system (3), a data acquisition system (4), and a leakage unit component (5); The main test chamber (1) includes a foundation pit soil layer area (1.1) and a water level control area (1.2). An interlayer is provided between the foundation pit soil layer area (1.1) and the water level control area (1.2). The side plate of the foundation pit soil layer area (1.1) is provided with an upper seepage outlet (1.1.2) and a lower seepage outlet (1.1.3) at different heights. The water level control area (1.2) is used to adjust the water level in the foundation pit soil layer area (1.1). The water and sand collection system (3) includes a diversion channel (3.1) and a water and sand collection box (3.2). The diversion channel (3.1) is used to divert water and sand leaking from the upper seepage port (1.1.2) or the lower seepage port (1.1.3). The water and sand collection box (3.2) is used to receive the water and sand diverted by the diversion channel (3.1). The data acquisition system (4) includes a weight sensor, a flow sensor and a vision sensor. The weight sensor is used to detect the mass change of the water and sand collection box (3.2). The flow sensor is set on the guide channel (3.1). The vision sensor is set in front of and above the main test box (1) to collect image information of soil erosion evolution and deformation. The leakage unit assembly (5) includes multiple leakage elements (5.1) and a plug (5.2). The leakage elements are installed to match the upper leakage port (1.1.2) and the lower leakage port (1.1.3). Different leakage elements are used to simulate different leakage port types. The plug is used to block the upper leakage port or the lower leakage port.

2. The local leakage model device for deep foundation pit retaining structure according to claim 1, characterized in that, The side plates and bottom plate of the main test chamber (1) are made of transparent material. The side plates are used to simulate the retaining structure of the foundation pit (1.1.1).

3. The local leakage model device for deep foundation pit retaining structure according to claim 2, characterized in that, The transparent material is transparent acrylic glass.

4. The local leakage model device for deep foundation pit retaining structure according to claim 1, characterized in that, The side plate of the water level control area (1.2) is provided with an inlet (1.2.2) and an outlet (1.2.3). The inlet (1.2.2) is connected to a water pump, and valves are provided on both the inlet (1.2.2) and the outlet (1.2.3).

5. The local leakage model device for deep foundation pit retaining structure according to claim 1, characterized in that, It also includes a test chamber frame (2), which includes an upper cover plate (2.1), a reinforcing angle steel (2.2) and a base (2.3). The main test chamber (1) is set on the base (2.3). The side plate and the bottom plate of the main test chamber (1) are connected by the reinforcing angle steel (2.2). The upper cover plate (2.1) is set above the main test chamber (1) and is detachably connected to the reinforcing angle steel (2.2).

6. The local leakage model device for deep foundation pit retaining structure according to claim 1, characterized in that, The spacer layer includes a porous glass plate (1.2.4) and transparent gauze. The porous glass plate (1.2.4) has evenly arranged circular holes of the same size, and the transparent gauze covers the porous glass plate (1.2.4).

7. The local leakage model device for deep foundation pit retaining structure according to claim 4, characterized in that, Waterproof silicone sealant is provided at the connection between the side plate and the bottom plate of the main test chamber (1), and waterproof silicone sealant is provided at the inlet (1.2.2) and outlet (1.2.3).

8. The local leakage model device for deep foundation pit retaining structure according to claim 1, characterized in that, The weight sensor is an electronic scale (4.1), the flow sensor is a flow meter (4.2), and the vision sensor is a camera.

9. The local leakage model device for deep foundation pit retaining structure according to claim 1, characterized in that, The leakage component (5.1) is provided with through holes (5.3) of different shapes and sizes. The through holes (5.3) on the leakage component (5.1) include rectangles, squares and circles. The through holes (5.3) are used to simulate different leakage outlet types.

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