A kind of simulation retaining wall active earth pressure test device

Abstract

A kind of simulation retaining wall active soil pressure test device, including main frame structure, loading device and precipitation device, main frame structure includes upper side main beam, lower base, immovable partition plate-and movable partition plate, water sprinkling device is arranged in upper side main beam, water sprinkling device is connected water sprinkling nozzle, drainage passage is arranged in immovable partition plate-and movable partition plate from top to bottom, for simulating soil extrusion drainage process, the upper side of drainage passage is provided with filter core, to prevent soil loss, the lower side is connected lower base drainage, resin glass is installed on lower base, loading device uses electromagnetic load, several loading device is evenly arranged on fixed partition plate and movable partition plate face to face, threaded steel pipe is arranged below movable partition plate, for restoring position after experiment, displacement measuring device is arranged below threaded steel pipe, the advancing distance of movable partition plate is measured.Using electromagnetic loading device load control is more accurate, and real-time adjustable, and through valve control drainage system can better simulate various situations in actual engineering.

Description

Technical Field

[0001] This utility model relates to a test device for simulating active earth pressure on retaining walls, which is mainly used in test equipment and belongs to the field of teaching technology. Background Technology

[0002] Retaining walls, as common civil engineering structures, primarily function to resist lateral pressure on the soil, ensuring soil stability. They are widely used in roads, bridges, ports, underground structures, and other fields. Accurately assessing the active earth pressure borne by the retaining wall during design and construction is crucial for ensuring structural safety and economic efficiency. However, due to the complex nonlinear mechanical properties of soil and its influence by various factors (such as soil type, loading conditions, and drainage), the distribution of earth pressure in actual engineering projects is often difficult to predict accurately using traditional theoretical calculations or empirical formulas.

[0003] Currently, research on earth pressure on retaining walls is mainly conducted through the following methods: (1) theoretical model analysis, calculating earth pressure distribution based on classical earth pressure theories (such as Coulomb's earth pressure theory or Rankine's earth pressure theory); (2) numerical simulation, simulating the interaction between soil and retaining wall using methods such as finite element or discrete element methods; and (3) physical model test, simulating the working state of retaining wall by constructing experimental devices, and directly measuring and analyzing the earth pressure distribution law. However, existing experimental devices have some problems in the earth pressure simulation process, such as insufficient accuracy of loading methods, difficulty in flexibly controlling drainage conditions, and difficulty in achieving high precision in soil displacement measurement. These problems limit the accuracy of experimental results and their guiding value for engineering.

[0004] To address the aforementioned issues, it is necessary to develop an earth pressure testing device that can precisely control loading conditions, flexibly simulate drainage conditions, and measure displacement in real time. This would allow for a more realistic reproduction of complex engineering conditions and improve the reliability and practicality of the test results. Utility Model Content

[0005] The purpose of this utility model patent is to overcome the shortcomings of insufficient accuracy in loading methods and difficulty in flexibly controlling drainage conditions, and to provide a test device for simulating active earth pressure on retaining walls. This test device uses an electromagnetic loading device for more precise load control, which is adjustable in real time, and the drainage system controlled by valves can better simulate various situations in actual engineering projects.

[0006] The technical solution is as follows:

[0007] An active earth pressure testing device for simulating retaining walls includes a main frame structure, a loading device, and a dewatering device. The main frame structure includes an upper main beam, a lower base, a fixed partition, and a movable partition. A water sprinkler is installed on the upper main beam, connected to a sprinkler head. Drainage channels are arranged from top to bottom in the fixed and movable partitions to simulate the soil compression and drainage process. A filter element is installed on one side of the drainage channel to prevent soil loss, and the lower side is connected to the lower base for drainage. Resin glass is installed on the lower base. The loading device uses electromagnetic loaders, with several electromagnetic loaders evenly arranged face-to-face on the fixed and movable partitions. A threaded steel pipe is installed below the movable partition for restoring its position after the experiment. A displacement measuring device is installed below the threaded steel pipe to measure the forward distance of the movable partition.

[0008] Preferably, a valve is provided on one side of the filter element to simulate drainage and non-drainage conditions.

[0009] Preferably, graduation lines are marked on the resin glass to facilitate observation of soil movement during the test.

[0010] Preferably, the electromagnetic loader includes a coil, a magnet, and a housing, and applies a load to the electromagnetic loading device by controlling the magnitude of the current.

[0011] Preferably, the main frame structure described above can be customized according to the size of the laboratory, making it suitable for soil tests of different scales.

[0012] Preferably, the loading device can add a pad to one side of the partition to increase the force-bearing area; or the loading device can be added as needed.

[0013] Compared with existing testing devices, the beneficial effects of this utility model patent are:

[0014] 1. This utility model adopts a combination design of upper and lower main beams and immovable and movable partitions, and sets threaded steel pipes under the movable partitions for reset operation after the experiment. This ensures the stability of the device structure, facilitates the repetition and adjustment of the experiment, and greatly improves the efficiency of the device.

[0015] 2. This utility model employs an electromagnetic loading device, which achieves precise control of the loading force by controlling the magnitude of the current. Compared with traditional mechanical loading methods, the electromagnetic loading device features rapid response, more uniform load application, and more flexible adjustment. It can adjust the loading magnitude in real time to meet different test requirements, thereby improving the accuracy and reliability of test results. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model patent;

[0017] Figure 2 This is a schematic diagram of the loading device structure of this utility model patent;

[0018] Figure 3 This is a schematic diagram of the resin glass structure of this utility model patent;

[0019] In the diagram, 1-upper main beam; 2-sprinkler device; 3-sprinkler nozzle; 4-1-immovable partition; 4-2-movable partition; 5-fixed partition; 6-electromagnetic loading; 7-resin glass; 8-drainage channel; 9-filter element; 10-lower base drainage; 11-lower base; 12-threaded steel pipe; 13-displacement measuring device; 14-gradient line. Detailed Implementation

[0020] The present utility model patent will be further described below with reference to the accompanying drawings. The following description is only used to more clearly illustrate the technical solution of the present utility model patent, and should not be used to limit the scope of protection of the present utility model patent.

[0021] like Figure 1-3 As shown, a simulated active earth pressure test device for retaining walls includes a main frame structure, a loading device, and a dewatering device. The main frame structure includes an upper main beam 1, a lower base 11, a fixed partition 4-1, and a movable partition 4-2. A water sprinkler 2 is installed on the upper main beam 1, and the water sprinkler 2 is connected to a water spray nozzle 3. Drainage channels 8 are arranged from top to bottom in the fixed partition 4-1 and the movable partition 4-2 to simulate the soil compression and drainage process. A filter element 9 is installed on one side of the upper part of the drainage channel 8 to prevent soil loss, and the lower part is connected to the lower base drainage 10. Resin glass 7 is installed on the lower base 11. The loading device uses electromagnetic loaders 6, and several electromagnetic loaders 6 are evenly arranged face-to-face on the fixed partition 5 and the movable partition 4-2. A threaded steel pipe 12 is installed below the movable partition 4-2 for restoring the position after the experiment. A displacement measuring device 13 is arranged below the threaded steel pipe to measure the forward distance of the movable partition.

[0022] Preferably, a valve is provided on one side of the filter element to simulate drainage and non-drainage conditions.

[0023] Preferably, graduation lines 14 are marked on the resin glass to facilitate observation of soil movement during the test.

[0024] Preferably, the electromagnetic loader 6 includes a coil, a magnet, and a housing, and applies a load to the electromagnetic loading device by controlling the magnitude of the current.

[0025] Preferably, the main frame structure described above can be customized according to the size of the laboratory, making it suitable for soil tests of different scales.

[0026] Preferably, the loading device can add a pad to one side of the partition to increase the force-bearing area; or the loading device can be added as needed.

[0027] Example 1: In practical engineering, precipitation can cause changes in water pressure within the soil, thus affecting the active earth pressure on the retaining wall. This device, by adjusting the valve status of the drainage channel and the function of the filter element, can flexibly simulate the soil compression process under both drained and non-drained conditions. Under different precipitation rates and drainage conditions, the loading device gradually increases the load, measures the soil displacement and changes in active earth pressure, and analyzes the impact of precipitation on the internal pressure distribution and stability of the soil, providing a basis for designing retaining walls with strong anti-sliding stability.

[0028] Example 2: Retaining wall projects utilize diverse types of fill materials, such as sand, clay, and gravel. The different mechanical properties of these soils can lead to significant differences in the distribution of active earth pressure. This device simulates actual working conditions by gradually applying horizontal pressure through adjustments to the load of the electromagnetic loading device, allowing for the study of the mechanical behavior of different fill materials. During the experiment, the loading force is gradually increased while simultaneously measuring the displacement and pressure changes of the movable partition, observing the deformation characteristics and pressure distribution patterns of the fill materials. The active earth pressure values ​​of different fill materials under drained and undrained conditions are compared, providing a reference for material selection and engineering design.

[0029] The above are merely preferred embodiments of this utility model patent. For those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model patent, but these improvements and modifications should also be considered within the scope of protection of this utility model patent.

Claims

1. A device for simulating active earth pressure testing of a retaining wall, characterized in that, The system includes a main frame structure, a loading device, and a dewatering device. The main frame structure includes an upper main beam (1), a lower base (11), a fixed partition (4-1), and a movable partition (4-2). A sprinkler device (2) is installed on the upper main beam (1), and the sprinkler device (2) is connected to a sprinkler head (3). Drainage channels (8) are arranged from top to bottom in the fixed partition (4-1) and the movable partition (4-2) to simulate the soil compression and drainage process. A filter element is installed on one side above the drainage channel (8). 9) To prevent soil loss, the lower base is connected to the drainage (10) on one side. Resin glass (7) is installed on the lower base (11). The loading device adopts an electromagnetic loader (6). Several electromagnetic loaders (6) are evenly arranged face-to-face on the fixed partition (5) and the movable partition (4-2). A threaded steel pipe (12) is set below the movable partition (4-2) for restoring the position after the experiment. A displacement measuring device (13) is set below the threaded steel pipe to measure the forward distance of the movable partition.

2. The device for simulating active earth pressure testing of a retaining wall according to claim 1, characterized in that, A valve is installed on one side of the filter element to simulate drainage and non-drainage conditions.

3. The device for simulating active earth pressure testing of a retaining wall according to claim 1, characterized in that, Mark the scale lines (14) on the resin glass to facilitate observation of soil movement during the test.

4. The device for simulating active earth pressure testing of a retaining wall according to claim 1, characterized in that, The electromagnetic loader (6) includes a coil, a magnet and a housing, and applies a load to the electromagnetic loading device by controlling the magnitude of the current.

5. The device for simulating active earth pressure testing of a retaining wall according to claim 1, characterized in that, The main frame structure can be customized according to the size of the laboratory, making it suitable for soil tests of different scales.

6. The device for simulating active earth pressure testing of a retaining wall according to claim 1, characterized in that, The loading device can add a pad to one side of the partition to increase the force-bearing area; it can also add loading devices as needed.

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