A soil frost heave deformation test system

Abstract

The present invention relates to the technical field of road soil testing, and specifically discloses a soil frost heave deformation test system, which includes a base plate. A turntable is rotatably connected to the base plate. A plurality of sliding grooves are provided on the turntable. A slider is slidably connected in each sliding groove. A first spring is fixedly connected between the slider and the sliding groove. A suspension pipe is fixedly connected to each slider. An arc-shaped plate is fixedly connected to the lower end of the suspension pipe. A plurality of arc-shaped plates can be spliced into a circular pipe. A first cold source cavity is provided on each arc-shaped plate. A base pipe is fixedly connected to the center of the turntable. A suspension rod is slidably connected in the base pipe. A pressing plate is fixedly connected to the lower end of the suspension rod. A second cold source cavity is provided in the pressing plate. The beneficial effect of the present invention is that before the pressure test, the circular pipe is dispersed into arc-shaped plates again and separated from the soil column, so that the soil column will not be blocked when being pressed, and the test result has high accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of road soil testing, and particularly to a soil frost heave deformation test system. Background Art

[0002] With the rapid development of various monitoring means, the experimental research technology of frozen soil has also been greatly improved. The research on the frost heave mechanism has been a key point in the research of the frozen soil academic community in recent years. Many scientific workers from various countries have conducted a large number of experimental studies, accumulated a large amount of frost heave test data on various soils, and established many relationships between soil frost heave and its various physical parameters.

[0003] In order to test the frost heave deformation of soil, CN108519405B discloses an experimental device for studying the relationship between force and deformation during the frost heave process of soil. When this experimental device is used, the soil to be tested is placed in an organic glass tank, and the soil is cooled through the conduction of a refrigerant, so that the soil freezes. Then, the frozen soil in the organic glass tank is extruded to test the compressive deformation of the soil after being passive. However, in the process of extruding the soil, the soil is always located in the organic glass tank, and the tank wall of the organic glass tank will block a part of the soil. In this way, during the process of pressing the soil, the tank wall of the organic glass tank will generate a certain reaction force on the side of the soil, which will affect the deformation of the soil, resulting in inaccurate test results of the device. Summary of the Invention

[0004] The purpose of the present invention is to solve the deficiencies existing in the prior art and propose a soil frost heave deformation test system.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A soil frost heave deformation test system includes a base plate. A turntable is rotatably connected to the base plate. A plurality of sliding grooves are provided on the turntable. A slider is slidably connected in each sliding groove. A first spring is fixedly connected between the slider and the sliding groove. A suspension pipe is fixedly connected to each slider. An arc plate is fixedly connected to the lower end of the suspension pipe. A plurality of arc plates can be spliced into a circular pipe. A first cold source cavity is provided on each arc plate. A base pipe is fixedly connected to the center of the turntable. A suspension rod is slidably connected in the base pipe. A pressing plate is fixedly connected to the lower end of the suspension rod. A second cold source cavity is provided in the pressing plate.

[0007] Preferably, an adjusting ring is rotatably connected to the upper side of the turntable. A plurality of arc-shaped protrusions are provided on the inner ring surface of the adjusting ring. When the arc-shaped protrusions are aligned with the sliders, the plurality of sliders approach each other relatively, and the plurality of arc plates are exactly spliced into a circular pipe. When the arc-shaped protrusions are misaligned with the sliders, under the action of the first spring, the plurality of sliders move away from each other relatively, and the plurality of arc plates also separate.

[0008] Preferably, a handle is provided on the adjusting ring, and a locking screw is provided on the adjusting ring.

[0009] Preferably, a cutting tool is fixedly connected to the lower side of each arc-shaped plate.

[0010] Preferably, a toothed ring is fixedly connected to the outside of the turntable, a motor is installed on the base plate, a gear is fixedly connected to the main shaft of the motor, and the gear meshes with the toothed ring.

[0011] Preferably, a bolt is provided on the base pipe, and a jack is provided on the suspension rod. When the bolt is inserted into the jack, the pressing plate is separated from the round pipe.

[0012] Advantages of the present invention: The soil frost heave deformation test system provided by the present invention forms a soil column by drilling a geological layer with a round pipe formed by splicing a plurality of arc-shaped plates, and can also protect the soil column to prevent damage to the soil column during the excavation process. After the excavation is completed, the round pipe can be dispersed into arc-shaped plates again and separated from the soil column before the pressure test. In this way, the soil column will not be blocked when being pressed, and the test result accuracy is high. Description of the Drawings

[0013] Figure 1 is the basic structure diagram of a soil frost heave deformation test system provided by the present invention;

[0014] Figure 2 is Figure 1 usage diagram of;

[0015] Figure 3 is Figure 2 enlarged view of part A of;

[0016] Figure 4 is a schematic diagram when a round pipe is formed by splicing a plurality of arc-shaped plates;

[0017] Figure 5 is a schematic diagram when a plurality of arc-shaped plates are separated;

[0018] Figure 6 is a sectional view of the arc-shaped plate;

[0019] Figure 7 is a schematic diagram of a soil column to be excavated;

[0020] Figure 8 is a process diagram of soil column excavation.

[0021] In the figure: substrate - 1, connecting plate - 11, turntable - 2, toothed ring - 21, gear - 22, motor - 23, adjusting ring - 24, handle - 25, locking screw - 26, arc-shaped convex block - 29, base pipe - 3, pin - 31, slider - 4, hanging pipe - 41, vertical pipe - 42, trapezoidal block - 43, bracket - 48, arc-shaped convex plate - 49, arc-shaped plate - 5, cutter - 50, first connecting pipe - 51, installation cavity - 52, sliding rod - 53, test plate - 54, air outlet - 55, hose - 56, rectangular hole - 57, second spring - 58, pressing plate - 6, second connecting pipe - 61, suspender - 7, pressure sensor - 71, geological layer - 91, depression - 92, area around the circular pipe - 93, soil column - 100. Detailed implementation manners

[0022] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Embodiment 1

[0023] As Figures 1-5 shown, a soil frost heaving deformation test system of this embodiment includes a substrate 1. A connecting plate 11 is arranged on one side of the substrate 1. The substrate 1 is installed on a mobile lifting vehicle through the connecting plate 11. The mobile lifting vehicle is a prior art, which can not only drive the substrate 1 to move, but also drive the substrate 1 to vertically move up and down.

[0024] A rotating hole is arranged on the substrate 1. A turntable 2 is rotatably connected in the rotating hole. A toothed ring 21 is fixedly connected to the outside of the turntable 2. A motor 23 is installed on the substrate 1. A gear 22 is fixedly connected to the main shaft of the motor 23. The gear 22 meshes with the toothed ring 21. By driving the gear to rotate through the motor 23, the turntable 2 can be rotated.

[0025] A plurality of sliding grooves are arranged on the turntable 2. A slider 4 is slidably connected in each sliding groove. A first spring is fixedly connected between the slider 4 and the sliding groove. An installation hole is arranged on each slider 4. A hanging pipe 41 is fixedly connected in the installation hole. The lower end of the hanging pipe 41 is fixedly connected to an arc-shaped plate 5. An adjusting ring 24 is rotatably connected to the upper side of the turntable 2. A handle 25 is arranged on the adjusting ring 24. A locking screw 26 is arranged on the adjusting ring 24. After loosening the locking screw 26, the adjusting ring 24 can be conveniently rotated through the handle 25. After adjustment, the adjusting ring 24 is locked and fixed through the locking screw 26 to prevent the adjusting ring 24 from rotating again.

[0026] The inner ring surface of the adjusting ring 24 is provided with a plurality of arc-shaped bumps 29. When the arc-shaped bumps 29 are aligned with the sliders 4, the plurality of sliders 4 approach relatively, and the plurality of arc-shaped plates 5 just form a circular tube. When the arc-shaped bumps 29 are misaligned with the sliders 4, under the action of the first spring, the plurality of sliders 4 move away relatively, and the plurality of arc-shaped plates 5 also separate. A cutter 50 is fixedly connected to the lower side of each arc-shaped plate 5. The plurality of arc-shaped plates 5 can form a circular tube. At this time, when the circular tube moves downward and rotates, drilling can be carried out downward through the cutter 50.

[0027] A first cold source cavity is provided on each arc-shaped plate 5. Two first connecting pipes 51 are provided on the arc-shaped plate 5. Cold air or cold liquid is filled into the first cold source cavity through one of the first connecting pipes 51 and then discharged from the other first connecting pipe. In this way, the temperature inside the arc-shaped plate 5 can be greatly reduced, and the soil to be tested inside the circular tube can be frozen through the arc-shaped plate 5.

[0028] A base pipe 3 is fixedly connected to the center of the turntable 2. A suspension rod 7 is slidably connected inside the base pipe 3. The top of the suspension rod 7 is fixedly connected with a connecting shaft, and the connecting shaft is used to connect with a press. A pressure sensor 71 is installed between the connecting shaft and the suspension rod 7. The pressure on the frozen soil can be measured through the pressure sensor 71. The lower end of the suspension rod 7 is fixedly connected with a pressing plate 6, and a second cold source cavity is provided inside the pressing plate 6. Two second connecting pipes 61 are provided on the pressing plate 6. The second connecting pipes 61 are used to provide cold air or cold liquid for the second cold source cavity, which is the same as the form of the second cold source cavity and will not be elaborated here.

[0029] During the use process, refer to Figure 7 and Figure 8, when it is necessary to test the underlying soil quality, first dig out the soil on the upper layer of the geological layer 91 to form a depression 92, and then drill downward through the circular pipe and the cutter 50 at its bottom, so as to form a soil column 100 to be tested at the bottom of the depression 92. Then, dig out all the soil in the area 93 around the circular pipe. During the digging process, the suspension rod 7, that is, the pressing plate 6, can be lifted upward to prevent it from affecting the digging process. There is a pin 31 on the base pipe 3, and a jack is provided on the suspension rod 7. When the pin 31 is inserted into the jack, the pressing plate 6 is separated from the circular pipe. During the digging process, the circular pipe formed by splicing multiple arc-shaped plates 5 can protect the tested soil column 100 and prevent the tested soil column 100 from being damaged during the digging process. After the digging is completed, the circular pipe formed by splicing multiple arc-shaped plates 5 can cool the soil column 100 to be tested, so that the tested soil column 100 is frozen. Using the pressing plate can also freeze the soil column 100. The cooperation of the pressing plate and the circular pipe can improve the freezing effect of the soil column 100. Before applying pressure to the soil column 100 through the pressing plate 6, first loosen the locking screw, and rotate the adjusting ring 24 through the handle, so that the arc-shaped convex block 29 is misaligned with the slider 4. Under the action of the first spring, the multiple sliders 4 move relatively away from each other, and the multiple arc-shaped plates 5 also separate. In this way, the arc-shaped plates 5 will not block the soil column 100 during the test, and the test effect will be more accurate. Embodiment 2

[0030] On the basis of Embodiment 1, in order to further monitor the change of the side wall of the soil column 100 when it is pressed, see Figure 6 , an installation cavity 52 is arranged in the arc-shaped plate 5. One side of the installation cavity 52 is provided with a sliding hole penetrating through the arc-shaped plate 5. A sliding rod 53 is slidably connected in the sliding hole. One end of the sliding rod 53 is fixedly connected with a test plate 54. A sensor is installed on the test plate 54. A relief groove is arranged on the side wall of the arc-shaped plate 5. The test plate 54 is located in the relief groove. A second spring 58 is fixedly connected between the tail of the sliding rod 53 and the inner wall of the installation cavity 52. The second spring 58 provides a pulling force for the sliding rod 53 in the initial state, so that the test plate 54 is located in the relief groove. A rectangular hole 57 is arranged on the sliding rod 53. One side of the rectangular hole 57 is provided with an inclined surface. A vertical pipe 42 is slidably connected in the suspension pipe 41. The vertical pipe 42 extends into the installation cavity 52 and passes through the rectangular hole 57. A trapezoidal block 43 is fixedly connected to one side of the vertical pipe 42. The inclined surface of the trapezoidal block 43 is arranged corresponding to the inclined surface of the rectangular hole 57. When the vertical pipe 42 moves downward, the trapezoidal block 43 presses the sliding rod 53, so that the sliding rod 53 extends out.

[0031] When the arc-shaped plates 5 are separated, moving the vertical pipe 42 downward can make the sliding rod 53 and the test plate 54 extend out, so that the test plate 54 is close to the soil column 100. When the test plate 54 is pressed, the deformation amount of the soil column 100 is tested through the sensor. The sensor testing method is the prior art and will not be elaborated here.

[0032] To facilitate the downward movement of the riser pipe 42, a connecting bracket 48 is fixedly attached to the turntable 2. An arc-shaped convex plate 49 is installed on the bracket 48 and is arranged on the movement path of the riser pipe 42. When the upper end of the riser pipe 42 comes into contact with the arc-shaped convex plate 49, the riser pipe 42 is pushed downward by the arc-shaped convex plate 49. This enables the test plate 54 to approach the soil column 100.

[0033] To prevent the soil column 100 from freezing and adhering to the arc-shaped plate 5, an air cavity is provided inside the test plate 54. Multiple air outlet holes 55 communicating with the air cavity are arranged on the test plate 54, and the hot air in the air cavity is discharged towards the soil column 100 through the air outlet holes 55. This helps to separate the test plate 54 from the soil column 100. To facilitate the entry and exit of hot air into and from the air cavity, an air supply hole communicating with the air cavity is provided inside the sliding rod 53, and the other end of the air supply hole is connected to the riser pipe 42 through a hose 56. In this way, hot air can be blown into the air cavity through the riser pipe 42.

Claims

1. An experimental system for soil frost heave deformation, characterized in that: It includes a substrate (1), on which a turntable (2) is rotatably connected. A plurality of chutes are provided on the turntable (2), and a slider (4) is slidably connected in each chute. A first spring is fixedly connected between the slider (4) and the chute. A suspension pipe (41) is fixedly connected to each slider (4). An arc-shaped plate (5) is fixedly connected to the lower end of the suspension pipe (41). A plurality of arc-shaped plates (5) can be spliced into a circular pipe. A first cold source cavity is provided on each arc-shaped plate (5). A base pipe (3) is fixedly connected to the center of the turntable (2). A suspension rod (7) is slidably connected in the base pipe (3). A pressing plate (6) is fixedly connected to the lower end of the suspension rod (7). A second cold source cavity is provided in the pressing plate (6). An adjusting ring (24) is rotatably connected to the upper side of the turntable (2). A plurality of arc-shaped bumps (29) are provided on the inner ring surface of the adjusting ring (24). When the arc-shaped bumps (29) are aligned with the sliders (4), the plurality of sliders (4) move closer to each other, and the plurality of arc-shaped plates (5) are exactly spliced into a circular pipe. When the arc-shaped bumps (29) are misaligned with the sliders (4), under the action of the first spring, the plurality of sliders (4) move away from each other, and the plurality of arc-shaped plates (5) also separate. A handle (25) is provided on the adjusting ring (24), and a locking screw (26) is provided on the adjusting ring (24). When it is necessary to test the soil quality of the bottom layer, first excavate the soil on the upper layer of the geological layer (91) to form a depression (92). Then, drill downward through the circular pipe and the cutter (50) at its bottom, so that a soil column (100) to be tested is formed at the bottom of the depression (92). Then, all the soil in the area (93) around the circular pipe is excavated. During the excavation process, the suspension rod (7) and the pressing plate (6) are lifted upward to prevent them from affecting the excavation process. The circular pipe spliced by a plurality of arc-shaped plates (5) can protect the soil column (100) to be tested and prevent the soil column (100) to be tested from being damaged during the excavation process. After the excavation is completed, the circular pipe spliced by a plurality of arc-shaped plates (5) can cool the soil column (100) to be tested, so that the soil column (100) to be tested is frozen. The pressing plate can also freeze the soil column (100). Before applying pressure to the soil column (100) through the pressing plate (6), first loosen the locking screw, and rotate the adjusting ring (24) through the handle, so that the arc-shaped bumps (29) are misaligned with the sliders (4). Under the action of the first spring, the plurality of sliders (4) move away from each other, and the plurality of arc-shaped plates (5) also separate. In this way, the arc-shaped plates (5) will not block the soil column (100) during the test process. An installation cavity (52) is arranged inside the arc-shaped plate (5). A sliding hole penetrating the arc-shaped plate (5) is arranged on one side of the installation cavity (52). A sliding rod (53) is slidably connected in the sliding hole. One end of the sliding rod (53) is fixedly connected to a test plate (54). A sensor is installed on the test plate (54). A relief groove is arranged on the side wall of the arc-shaped plate (5). The test plate (54) is located in the relief groove. A second spring (58) is fixedly connected between the tail of the sliding rod (53) and the inner wall of the installation cavity (52). The second spring (58) provides a pulling force for the sliding rod (53) in the initial state, so that the test plate (54) is located in the relief groove. A rectangular hole (57) is arranged on the sliding rod (53). One side of the rectangular hole (57) is provided with an inclined surface. A riser pipe (42) is slidably connected in a suspension pipe (41). The riser pipe (42) extends into the installation cavity (52) and passes through the rectangular hole (57). A trapezoidal block (43) is fixedly connected to one side of the riser pipe (42). The inclined surface of the trapezoidal block (43) is arranged corresponding to the inclined surface of the rectangular hole (57). When the riser pipe (42) moves downward, the trapezoidal block (43) presses the sliding rod (53), so that the sliding rod (53) extends out; when the arc-shaped plates (5) are separated, moving the riser pipe (42) downward can make the sliding rod (53) and the test plate (54) extend out, so that the test plate (54) approaches the soil column (100). When the test plate (54) is pressed, the deformation amount of the soil column (100) is measured by the sensor.

2. The soil frost heave deformation test system according to claim 1, characterized in that: A cutter (50) is fixedly connected to the lower side of each arc-shaped plate (5).

3. The soil frost heaving deformation test system according to claim 1, wherein: A toothed ring (21) is fixedly connected to the outside of the turntable (2). A motor (23) is installed on the base plate (1). A gear (22) is fixedly connected to the main shaft of the motor (23). The gear (22) meshes with the toothed ring (21).

4. The soil frost heave deformation test system according to claim 1, characterized in that: A plug pin (31) is arranged on the base pipe (3). A jack is arranged on the suspension rod (7). When the plug pin (31) is inserted into the jack, the pressing plate (6) is separated from the round pipe.

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