Layered shear vibration table model box for simulating water and soil coupling dynamic response

Abstract

The utility model discloses a layered shear vibration table model box for simulating water and soil coupling dynamic response, and relates to the technical field of civil engineering. Comprising a bottom plate, a plurality of layered frames are arranged on the bottom plate, the layered frames are sequentially and correspondingly connected from bottom to top and arranged in a stacked mode to form an uncovered box body structure, a plurality of limiting plates are evenly arranged on the periphery of an uncovered box body formed by the layered frames, and a plurality of shearing sliding units which are symmetrically distributed are arranged on the two sides of the limiting plates. The shearing sliding units are evenly arranged between the adjacent layered frames, a water inlet pipe and a water outlet pipe are arranged above an uncovered box body formed by the layered frames, and the water inlet pipe and the water outlet pipe are each provided with a flow control valve and connected with an external water pump. By adopting the layered shear vibration table model box for simulating the water-soil coupling dynamic response, a site involving water-soil interaction can be simulated, and the influence of a water body on a soil body and the mechanical property change of the soil body under the water-soil coupling action can be simulated and explored.

Description

Technical Field

[0001] This utility model relates to the field of civil engineering technology, and in particular to a layered shear vibration table model box for simulating the dynamic response of water-soil coupling. Background Technology

[0002] In the field of geotechnical engineering, shaking table testing is an important means of studying the mechanical behavior of soil under dynamic loads such as earthquakes. Shaking table testing can realize various forms of seismic wave input and can simulate the entire process of several earthquakes of different magnitudes. It is known as the most direct indoor test for studying the seismic response law and failure mechanism of structures. It can realistically reproduce the earthquake process. To ensure that the performance of the model soil in the finite space model box under seismic excitation is consistent with that of the prototype soil in the semi-infinite space, the design and manufacturing of the model box directly affect the success or failure of the shaking table test.

[0003] Traditional shaking table model boxes have limitations when simulating some special site conditions. For example, when simulating sites involving water-soil interaction, such as coastal areas and river deltas, it is necessary to consider the influence of water on soil and the changes in the mechanical properties of soil under water-soil coupling. However, most existing shaking table model boxes lack effective water simulation devices and cannot accurately reproduce these complex site conditions.

[0004] Layered shear model boxes have certain advantages in simulating the shear deformation characteristics of soil, but there is no perfect design for combining them with water simulation. Therefore, it is necessary to develop a shaking table model box that can both reflect the layered shear characteristics and simulate the dynamic response of water-soil coupling, so as to better simulate the complex site conditions in actual engineering and provide a more accurate experimental platform for related research. Utility Model Content

[0005] The purpose of this invention is to provide a layered shear vibration table model box for simulating the dynamic response of water-soil coupling. It can simulate sites involving water-soil interaction and can simulate and explore the influence of water on soil and the changes in the mechanical properties of soil under water-soil coupling.

[0006] To achieve the above objectives, this utility model provides a layered shear vibration table model box for simulating the dynamic response of water-soil coupling, including a base plate. Several layered frames are arranged on the base plate. The layered frames are connected sequentially from bottom to top and stacked to form an open box structure. Several limiting plates are evenly arranged around the open box formed by the layered frames. Several symmetrically distributed shear sliding units are arranged on both sides of the limiting plates. The shear sliding units are evenly arranged between adjacent layered frames. A water inlet pipe and a water outlet pipe are arranged on the top of the open box formed by the layered frames. Both the water inlet pipe and the water outlet pipe are equipped with flow control valves and connected to an external water pump.

[0007] Preferably, the inner surface of the uncovered box formed by the layered frame is provided with a water-proof membrane. The layered frame is provided with a soil filling area and a water filling area from bottom to top. A number of strain sensors are uniformly arranged inside the layered frame at the positions corresponding to the soil filling areas. A number of acceleration sensors are uniformly arranged outside the layered frame at the positions corresponding to the soil filling areas. The acceleration sensor is located at one corner of the outer side of the bottom plate.

[0008] Preferably, the waterproof membrane is provided between the soil filling area and the water filling area, and a number of pressure sensors are provided inside the layered frame on one side of the water filling area.

[0009] Preferably, the shearing sliding unit is configured as a linear needle roller array.

[0010] Preferably, water-proofing measures are provided at the internal connections between the layered frames and at the connection between the shear sliding unit and the layered frame.

[0011] Preferably, the connection method at the bend of the waterproof membrane is a sealing strip connection, and the waterproof membrane is an HDPE high-density polyethylene film.

[0012] Therefore, the layered shear vibration table model box for simulating the dynamic response of water-soil coupling, which adopts the above-mentioned structure, has the following advantages compared with the prior art:

[0013] 1. The model box of this utility model can accurately simulate water-soil coupled site conditions: through the combination of the upper water filling function and the layered shear deformation structure, the model box can better simulate the mechanical behavior of soil under dynamic loads such as earthquakes in complex site conditions such as coastal areas and river deltas, providing a more accurate experimental platform for related research.

[0014] 2. Precise control of water flow and level: The design of the flow control valve and nozzle on the water supply pipeline allows for precise control of the water flow and level entering the model box, thereby better simulating different water-soil coupling conditions;

[0015] 3. Comprehensive sensor layout: The rationally arranged strain sensors, pressure sensors and acceleration sensors can comprehensively monitor various parameters of the model box during the test, providing rich data support for studying the mechanical properties of soil under water-soil coupling.

[0016] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the overall layered shear model box according to an embodiment of the present invention;

[0018] Figure 2 This is a front view of the linear needle roller array between the layered frames according to an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram showing the membrane arranged inside the box and at the boundary between the water and soil in an embodiment of this utility model.

[0020] Figure 4 This is a schematic diagram of the sensor arrangement according to an embodiment of the present invention;

[0021] Figure Labels

[0022] 1. Base plate; 2. Layered frame; 3. Limiting plate; 4. Shear sliding unit; 5. Water inlet pipe; 6. Drainage pipe; 7. Flow control valve; 8. External water pump; 9. Waterproof membrane; 10. Soil filling area; 11. Strain sensor; 12. Accelerometer; 13. Water filling area; 14. Pressure sensor; 15. Linear needle roller. Detailed Implementation

[0023] Example

[0024] In the description of this utility model, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] like Figures 1-4 As shown, this utility model discloses a layered shear vibration table model box for simulating the dynamic response of water-soil coupling. It includes a base plate 1, on which several layered frames 2 are arranged. The layered frames 2 are connected sequentially from bottom to top and stacked to form an open-top box structure. Several limiting plates 3 are evenly arranged around the open-top box formed by the layered frames 2. Several symmetrically distributed shear sliding units 4 are arranged on both sides of the limiting plates 3. The shear sliding units 4 are evenly arranged between adjacent layered frames 2. A water inlet pipe 5 and a drain pipe 6 are arranged above the open-top box formed by the layered frames 2. Flow control valves 7 are installed on both the water inlet pipe 5 and the drain pipe 6, and an external water pump 8 is connected to them. The layered frames 2 are made of high-strength metal materials, such as aluminum alloy, to ensure the strength and stability of the model box under vibration loads.

[0026] To simulate a site involving water-soil interaction, this invention includes a waterproof membrane 9 at the boundary between the soil and water bodies. This membrane separates the upper water body from the lower soil body and simulates the coupling effect between water and soil.

[0027] The inner surface of the uncovered box formed by the layered frame 2 is provided with a water-proof membrane 9. The interior of the layered frame 2 is provided with a soil filling area 10 and a water filling area 13 from bottom to top. A number of strain sensors 11 are uniformly arranged inside the layered frame 2 at the positions corresponding to the soil filling area 10. A number of acceleration sensors 12 are uniformly arranged outside the layered frame 2 at the positions corresponding to the soil filling area 10. An acceleration sensor 12 is set at one corner of the outer side of the bottom plate 1.

[0028] A waterproof membrane 9 is installed between the soil filling area 10 and the water filling area 13. Several pressure sensors 14 are installed inside the layered frame 2 on one side of the water filling area 13.

[0029] Sensors are arranged inside and outside the model box to monitor various parameters of the model box during the test. Strain sensors 11 are embedded in the soil inside the model box to measure the strain changes of the soil under vibration and water-soil coupling. Pressure sensors 14 are set in the area inside the model box near the water body to measure the pressure of water on the soil and the pressure changes of water during water-soil coupling. Acceleration sensors 12 are set on the side wall outside the model box to monitor the acceleration changes of the model box under the action of the vibration table.

[0030] The shear sliding unit 4 is set as a straight needle roller row 15, which allows the layered frame 2 to slide relative to each other in the vibration direction, thereby simulating the layered shear deformation characteristics of soil under earthquake action.

[0031] Compared to ball bearings, the linear needle roller array 15 increases the number of support points between each layer of square steel pipe and the upper square steel pipe, improving the stress conditions of each layer of layered frame 2. Since the linear needle roller array has linear rolling guidance, it can constrain the sliding direction of each layer of layered frame 2 in a set direction, which facilitates linear control on the same horizontal plane. Each wheel of the needle roller array moves independently and does not affect each other, thereby reducing the overall integrity of the model box, increasing the relative free sliding between layers, and making it easier to simulate the free shear deformation of soil under dynamic load.

[0032] Waterproofing measures are provided at the internal connections between the layered frames 2 and at the connection between the shear sliding unit 4 and the layered frame 2, using waterproofing measures such as rubber sealing rings to prevent water from seeping into the model box from these parts.

[0033] The connection method at the bends and joints of the waterproof membrane 9 is set as a sealing strip connection. The waterproof membrane 9 is made of HDPE high-density polyethylene membrane, which has a high seepage prevention coefficient and has a seepage prevention effect that ordinary waterproof materials cannot match. At the same time, it also has high tensile mechanical strength, excellent anti-aging, anti-ultraviolet and anti-decomposition ability. Its excellent water-proof effect and elastic deformation ability fully meet the seepage prevention and soil-water separation requirements of the vibration table model box of this utility model.

[0034] The specific implementation process is as follows:

[0035] 1. Assemble the model box

[0036] a. Prepare materials: Prepare the base plate, multiple aluminum alloy layered frames, multiple limiting components, hinges, linear needle rollers, water pump, inlet and outlet water pipes, sealing strips, sensors, and other materials.

[0037] b. Install the base plate: Fix the base plate to the vibration platform. Welding or other methods can be used to ensure that the base plate is firmly connected to the vibration platform so that the model box will not shift during vibration.

[0038] Install hinges on the base plate. The position and installation method of the hinges should be in accordance with the design requirements to ensure that they can function properly and provide support and connection points for the subsequent installation of the layered frame.

[0039] c. Install the layered frame: Place the aluminum alloy layered frame on the base plate in sequence. The adjacent frames should be parallel and able to slide in a direction parallel to the contact surface. During the placement process, pay attention to the accuracy of the frame's orientation and position to ensure that each layer of frame can be properly matched.

[0040] Check the stacking of the layered frames to ensure that the spacing between the frames is uniform and the overall structure is stable. You can use tools such as a level to measure and adjust the frames to ensure that they are flat in the horizontal direction.

[0041] d. Install linear needle rollers: Lay linear needle rollers between the layered frames. Four sets of linear needle rollers can be used for each layer to increase the number of support points between the frames and improve the stress conditions. The installation direction of the needle rollers should ensure that they can constrain the sliding direction of each layer of the frame in the set direction, so as to facilitate the simulation of free shear deformation of the soil under dynamic load.

[0042] Baffles are welded around the needle rollers to restrict their movement in the non-dominant direction. Appropriate space (e.g., about 10mm) is left between the baffles on both sides and between each needle roller in the dominant direction to ensure that the needle rollers can slide freely in the dominant direction and prevent them from shifting in the non-dominant direction.

[0043] e. Install the water system: Connect the water pipes and water pump. The water pipes extend along the side wall of the model box to the upper space inside the model box. Control valves are installed on both the water supply and drainage pipes.

[0044] f. Laying high-density polyethylene film: Thoroughly clean and dry the inside of the tank, the bottom, and the frame and needle rollers at the pre-defined seawater-soil boundary where sealing strips need to be applied, ensuring that the surface is free of dust, oil, moisture and other impurities to ensure that the sealing strips can be properly applied.

[0045] Accurately measure and cut the sealing strip according to the dimensions of the area requiring sealing, leaving an appropriate allowance. Starting from the beginning, carefully attach the sealing strip to the corresponding position, avoiding stretching or twisting the strip to maintain its shape. Ensure the sealing strip adheres tightly to the surface without air bubbles or gaps. After attachment, use a suitable tool (such as a pressure roller) to gently press the sealing strip firmly onto the surface, enhancing its adhesion and sealing effect. After attachment, carefully inspect the sealing strip for proper adhesion. Repair any loose areas or air bubbles promptly.

[0046] g. Sensor installation: According to experimental requirements, the flow velocity sensor is placed at the water inlet and outlet to monitor and control the water flow velocity; the strain sensor is placed inside the box to monitor the strain changes of the structure under vibration and fluid-structure interaction; the pressure sensor is placed at the boundary between the water body and the soil body to measure the pressure of the water flow on the model, analyze the distribution and variation of fluid pressure during fluid-structure interaction, and the impact on the model structure.

[0047] The sensor installation should ensure it can accurately measure the corresponding physical quantities, and the installation position and orientation should meet the design requirements. After installation, the sensor should be debugged and calibrated to ensure its measurement accuracy and reliability.

[0048] h. Install limiting components: Install limiting components on two opposite sides of the layered frame to restrict sliding between the layered frames perpendicular to the sliding direction, ensuring the relative position of the frames remains stable during vibration. The installation of the limiting components should be firm and reliable, with a tight fit between them and the frame; use hinges to connect the bottom of the limiting components to the base plate, making the limiting components and the base plate a whole, enhancing the stability of the model box.

[0049] 2. Experimental Preparation

[0050] a. Filling with soil: Configure the soil inside the model box according to the experimental design requirements. Different types of soil can be selected according to different experimental purposes, and filled in a certain proportion and layering method.

[0051] b. Install a waterproof membrane: After the soil is filled, lay a layer of high-density polyethylene membrane on top of the soil. This membrane is connected to the membrane on the side wall with sealing strips to separate the upper water body and the lower soil body.

[0052] 3. Experimental process

[0053] a. Open the flow control valves on the water pump and water supply pipe, adjust the water flow according to the experimental requirements, and fill the upper area inside the model box with water to start simulating the water-soil coupling effect.

[0054] b. Once the water level inside the tank reaches the set height, turn on the water pump to drain the water. The drainage flow rate should be consistent with the water filling flow rate to simulate water flow.

[0055] c. Start the shaking table, input the predetermined seismic wave or other dynamic load signal, so that the model box vibrates under the action of the shaking table, simulating the mechanical behavior of soil under dynamic load.

[0056] d. During the experiment, sensors are used to collect data such as strain and pressure inside the model box and acceleration outside the model box in real time, and these data are transmitted to the data acquisition system for analysis and processing.

[0057] 4. End of experiment

[0058] a. Stop the vibration table, close the flow control valve on the water supply pipe, and drain the water from the model box;

[0059] b. Disassemble the sensors and other detachable parts, clean and maintain the model box, and prepare for the next experiment.

[0060] Therefore, the layered shear vibration table model box of this utility model, which adopts the above-mentioned structure to simulate the dynamic response of water-soil coupling, can simulate sites involving water-soil interaction, and can simulate and explore the influence of water on soil and the changes in the mechanical properties of soil under water-soil coupling.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. A layered shear vibration table model box for simulating the dynamic response of water-soil coupling, characterized in that: The device includes a base plate on which several layered frames are arranged. These layered frames are connected sequentially from bottom to top and stacked to form an open-top box structure. Several limiting plates are evenly arranged around the open-top box formed by the layered frames. Several symmetrically distributed shearing and sliding units are arranged on both sides of the limiting plates. The shearing and sliding units are evenly arranged between adjacent layered frames. A water inlet pipe and a water outlet pipe are arranged on the top of the open-top box formed by the layered frames. Both the water inlet pipe and the water outlet pipe are equipped with flow control valves and connected to an external water pump.

2. The layered shear vibration table model box for simulating the dynamic response of water-soil coupling according to claim 1, characterized in that: The inner surface of the uncovered box formed by the layered frame is provided with a water-proof membrane. The interior of the layered frame is provided with a soil filling area and a water filling area from bottom to top. A number of strain sensors are uniformly arranged inside the layered frame at the positions corresponding to the soil filling areas. A number of acceleration sensors are uniformly arranged outside the layered frame at the positions corresponding to the soil filling areas. The acceleration sensor is located at one corner of the outer side of the bottom plate.

3. The layered shear vibration table model box for simulating the dynamic response of water-soil coupling according to claim 2, characterized in that: The waterproof membrane is provided between the soil filling area and the water filling area, and several pressure sensors are provided inside the layered frame on one side of the water filling area.

4. The layered shear vibration table model box for simulating the dynamic response of water-soil coupling according to claim 3, characterized in that: The shearing sliding unit is configured as a linear needle roller array.

5. The layered shear vibration table model box for simulating the dynamic response of water-soil coupling according to claim 4, characterized in that: Waterproofing measures are provided at the internal connections between the layered frames and at the connection between the shear sliding unit and the layered frame.

6. The layered shear vibration table model box for simulating the dynamic response of water-soil coupling according to claim 5, characterized in that: The connection method at the bend of the waterproof membrane is set as a sealing strip connection, and the waterproof membrane is set as an HDPE high-density polyethylene film.

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