Soil body frost heaving deformation test system

Abstract

The invention relates to the technical field of road soil body testing, and particularly discloses a soil body frost heaving deformation testing system which comprises a base plate, a rotating disc is rotationally connected to the base plate, a plurality of sliding grooves are formed in the rotating disc, a sliding block is slidably connected into each sliding groove, a first spring is fixedly connected between each sliding block and the corresponding sliding groove, and a hanging pipe is fixedly connected to each sliding block. The arc-shaped plates can be spliced into a round pipe, each arc-shaped plate is provided with a first cold source cavity, the center of the rotating disc is fixedly connected with a base pipe, the base pipe is internally and slidably connected with a hanging rod, the lower end of the hanging rod is fixedly connected with a pressing plate, and a second cold source cavity is formed in the pressing plate. The device has the beneficial effects that before a pressure test is carried out, the circular tube is dispersed into the arc-shaped plate again and leaves the soil column, so that the soil column is not shielded when being pressed, and the accuracy of a test result is high.

Description

Technical Field

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

[0002] With the rapid development of various monitoring methods, the experimental research technology of frozen soil has also undergone tremendous improvements. The study of frost heave mechanism has been a focus of frozen soil research in recent years. Many scientists from various countries have conducted a large number of experimental studies and accumulated a large amount of frost heave test data on various soils. At the same time, many relationships between soil frost heave and its various physical parameters have also been established.

[0003] In order to test the frost heave deformation of soil, CN108519405B discloses a test device for studying the relationship between force and deformation during the frost heave process of soil. When using the test device, the soil to be tested is placed in a plexiglass tank, and the soil is cooled by refrigerant conduction to freeze the soil. Then, the frozen soil is squeezed in the plexiglass tank, so as to test the passive compression deformation of the soil. However, in this way, during the squeezing of the soil, the soil is always in the plexiglass tank, and the tank wall of the plexiglass tank will partially block the soil. In this way, during the squeezing of the soil, the tank wall of the plexiglass tank will produce a certain reaction force on the side of the soil, which will affect the deformation of the soil, thereby making the test results of the device inaccurate. Summary of the invention

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

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A soil frost heave deformation test system comprises a base plate, a turntable rotatably connected to the base plate, a plurality of slide grooves are arranged on the turntable, a slider is slidably connected in each slide groove, a first spring is fixedly connected between the slider and the slide groove, a hanging pipe is fixedly connected to each slider, a curved plate is fixedly connected to the lower end of the hanging pipe, a plurality of curved plates can be spliced ​​into a circular tube, a first cold source cavity is arranged on each curved plate, a base tube is fixedly connected to the center of the turntable, a hanging rod is slidably connected in the base tube, a pressing plate is fixedly connected to the lower end of the hanging rod, and a second cold source cavity is arranged in the pressing plate.

[0006] Preferably, the upper side of the turntable is rotatably connected to an adjusting ring, and 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 are relatively close to each other, and the plurality of arc-shaped plates are just spliced ​​into a circular tube. When the arc-shaped protrusions are misaligned with the sliders, under the action of the first spring, the plurality of sliders are relatively far away from each other, and the plurality of arc-shaped plates are also separated.

[0007] Preferably, a handle is provided on the adjusting ring, and a locking screw is provided on the adjusting ring.

[0008] Preferably, a cutter is fixedly connected to the lower side of each arc-shaped plate.

[0009] Preferably, the outer side of the turntable is fixedly connected to a gear ring, a motor is mounted on the base plate, a gear is fixedly connected to the main shaft of the motor, and the gear is meshed with the gear ring.

[0010] Preferably, a pin is provided on the base pipe, and a socket is provided on the suspension rod. When the pin is inserted into the socket, the pressing plate is separated from the round pipe.

[0011] Beneficial effects of the present invention: a soil frost heave deformation test system provided by the present invention uses a circular tube formed by splicing multiple arc-shaped plates to drill holes in the geological layer to form a soil column, and can also protect the soil column to prevent the soil column from being damaged during the excavation process. After the excavation is completed, the soil around can be cooled and frozen through the circular tube. After the freezing is completed, the circular tube can be dispersed into arc plates again and leave the soil column before doing a pressure test. In this way, the soil column will not be blocked when under pressure, and the test result is highly accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a basic structural diagram of a soil frost heave deformation test system provided by the present invention; Figure 2 yes Figure 1 Usage diagram; Figure 3 yes Figure 2 A magnified image of point A; Figure 4 It is a schematic diagram of a circular tube formed by splicing multiple curved plates; Figure 5 It is a schematic diagram when multiple curved plates are separated; Figure 6 is a cross-sectional view of a curved plate; Figure 7 It is a schematic diagram of the soil column that needs to be excavated; Figure 8 This is a diagram of the process of excavating soil columns.

[0013] In the figure: base plate-1, connecting plate-11, turntable-2, gear ring-21, gear-22, motor-23, adjusting ring-24, handle-25, locking screw-26, arc-shaped protrusion-29, base pipe-3, latch-31, slider-4, hanging pipe-41, vertical pipe-42, trapezoidal block-43, bracket-48, arc-shaped protrusion plate-49, arc plate-5, cutter-50, first connecting pipe-51, installation cavity-52, slide rod-53, test plate-54, air outlet-55, hose-56, rectangular hole-57, second spring-58, pressure plate-6, second connecting pipe-61, hanging rod-7, pressure sensor-71, geological layer-91, depression-92, area around circular pipe-93, soil column-100. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is 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 intended to limit the present invention. Example 1

[0015] like Figure 1-Figure 5 As shown, a soil frost heave deformation test system of this embodiment includes a base plate 1, a connecting plate 11 is arranged on one side of the base plate 1, and the base plate 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 base plate 1 to move, but also drive the base plate 1 to move up and down vertically.

[0016] A rotating hole is provided on the base plate 1, and a turntable 2 is rotatably connected in the rotating hole. A gear ring 21 is fixedly connected to the outer side of the turntable 2. A motor 23 is installed on the base plate 1, and a gear 22 is fixedly connected to the main shaft of the motor 23. The gear 22 is meshed with the gear ring 21. The motor 23 drives the gear to rotate, so that the turntable 2 can rotate.

[0017] The turntable 2 is provided with a plurality of slide grooves, each of which is slidably connected to a slider 4, a first spring is fixedly connected between the slider 4 and the slide groove, a mounting hole is provided on each slider 4, a hanging tube 41 is fixedly connected to the mounting hole, the lower end of the hanging tube 41 is fixedly connected to an arc plate 5, the upper side of the turntable 2 is rotatably connected to an adjusting ring 24, a handle 25 is provided on the adjusting ring 24, a locking screw 26 is provided on the adjusting ring 24, after loosening the locking screw 26, the adjusting ring 24 can be conveniently rotated by the handle 25, and after the adjustment is completed, the adjusting ring 24 is locked and fixed by the locking screw 26 to prevent the adjusting ring 24 from rotating again.

[0018] The inner ring surface of the adjusting ring 24 is provided with a plurality of arc-shaped protrusions 29. When the arc-shaped protrusions 29 are aligned with the slider 4, the sliders 4 are relatively close to each other, and the arc-shaped plates 5 are just spliced ​​into a round tube. When the arc-shaped protrusions 29 are misaligned with the slider 4, the sliders 4 are relatively far away from each other under the action of the first spring, and the arc-shaped plates 5 are also separated. The lower side of each arc-shaped plate 5 is fixedly connected to a cutter 50, and the arc-shaped plates 5 can be spliced ​​into a round tube. At this time, when the round tube moves downward and rotates, the cutter 50 can be used to drill downward.

[0019] Each arc plate 5 is provided with a first cold source cavity, and two first connecting pipes 51 are provided on the arc 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 plate 5 can be greatly reduced, and the soil to be tested inside the circular tube can be frozen through the arc plate 5.

[0020] The center of the turntable 2 is fixedly connected to the base pipe 3, and the base pipe 3 is slidably connected to the suspension rod 7. The top of the suspension rod 7 is fixedly connected to the connecting shaft, which is used to connect to the press. A pressure sensor 71 is installed between the connecting shaft and the suspension rod 7, and the pressure on the frozen soil can be measured by the pressure sensor 71. The lower end of the suspension rod 7 is fixedly connected to the pressing plate 6, and the pressing plate 6 is provided with a second cold source cavity. 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 night to the second cold source cavity. The second connecting pipes 61 are the same as the second cold source cavity, and will not be described in detail here.

[0021] During use, see Figure 7 and Figure 8When the bottom soil needs to be tested, the soil on the upper layer of the geological layer 91 is first excavated to form a depression 92, and then a hole is drilled downward through the circular tube and the cutter 50 at the bottom thereof, so that a soil column 100 to be tested is formed at the bottom of the depression 92, and then all the soil in the area 93 around the circular tube is excavated. During the excavation process, the suspension rod 7, i.e., the pressure plate 6, can be lifted upward to prevent it from affecting the excavation process. A pin 31 is provided on the base pipe 3, and a socket is provided on the suspension rod 7. When the pin 31 is inserted into the socket, the pressure plate 6 is separated from the circular tube. During the excavation process, the circular tube formed by the splicing of multiple arc 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 tube formed by the splicing of multiple arc plates 5 can cool the soil column 100 to be tested, so that the soil column 100 to be tested is frozen. The use of a pressure plate can also freeze the soil column 100 at the same time. The combination of the pressure plate and the circular tube can improve the freezing effect of the soil column 100. Before applying pressure to the soil column 100 through the pressure plate 6, first loosen the locking screw, and use the handle to rotate the adjustment ring 24, so that the arc-shaped protrusion 29 is misaligned with the slider 4. Under the action of the first spring, the multiple sliders 4 are relatively far away, and the multiple arc plates 5 are also separated. In this way, the arc plate 5 will not block the soil column 100 during the test, so that the test effect will be more accurate. Example 2

[0022] On the basis of Example 1, in order to further monitor the changes in the side wall of the soil column 100 when it is compressed, see Figure 6 A mounting cavity 52 is provided in the arc plate 5, and a sliding hole penetrating the arc plate 5 is provided on one side of the mounting 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 mounted on the test plate 54. A yield groove is provided on the side wall of the arc plate 5. The test plate 54 is located in the yield groove. A second spring 58 is fixedly connected between the tail of the sliding rod 53 and the inner wall of the mounting 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 yield groove. A rectangular hole 57 is provided on the sliding rod 53, and an inclined surface is provided on one side of the rectangular hole 57. The vertical pipe 42 is slidably connected in the hanging pipe 41, and the vertical pipe 42 extends into the mounting cavity 52 and passes through the rectangular hole 57. One side of the vertical pipe 42 is fixedly connected to a trapezoidal block 43, and 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 squeezes the sliding rod 53, so that the sliding rod 53 extends out.

[0023] When the arc plate 5 is separated, moving the vertical pipe 42 downward can extend the sliding rod 53 and the test plate 54, so that the test plate 54 is close to the soil column 100. When the test plate 54 is pressed, the deformation of the soil column 100 is tested by the sensor. The sensor testing method is a prior art and will not be described in detail here.

[0024] In order to facilitate the downward movement of the standpipe 42, a bracket 48 is fixedly connected to the turntable 2, and an arc-shaped convex plate 49 is installed on the bracket 48. The arc-shaped convex plate 49 is arranged on the moving path of the standpipe 42. When the upper end of the standpipe 42 contacts the arc-shaped convex plate 49, the standpipe 42 is squeezed and moved downward by the arc-shaped convex plate 49. In this way, the test plate 54 can be close to the soil column 100.

[0025] In order to prevent the soil column 100 from being frozen and adhering to the curved plate 5, an air cavity is provided in the test plate 54, and a plurality of air outlets 55 connected to the air cavity are provided on the test plate 54, and the hot air in the air cavity is discharged to the soil column 100 through the air outlets 55. This helps to separate the test plate 54 from the soil column 100. In order to facilitate the hot air to enter and exit the air cavity, an air supply hole connected to the air cavity is provided in the slide bar 53, and the other end of the air supply hole is connected to the standpipe 42 through a hose 56, so that hot air can be blown into the air cavity through the standpipe 42.

Claims

1. A soil frost heave deformation test system, characterized in that: The invention comprises a base plate (1), the base plate (1) is rotatably connected to a turntable (2), the turntable (2) is provided with a plurality of slide grooves, each of which is slidably connected to a slider (4), a first spring is fixedly connected between the slider (4) and the slide groove, each of the sliders (4) is fixedly connected to a hanging tube (41), the lower end of the hanging tube (41) is fixedly connected to an arc plate (5), a plurality of arc plates (5) can be spliced ​​into a circular tube, each of the arc plates (5) is provided with a first cold source cavity, the center of the turntable (2) is fixedly connected to a base tube (3), a hanging rod (7) is slidably connected to the base tube (3), the lower end of the hanging rod (7) is fixedly connected to a pressing plate (6), and a second cold source cavity is provided in the pressing plate (6).

2. A soil frost heave deformation test system according to claim 1, characterized in that: The upper side of the rotating disk (2) is rotatably connected to an adjusting ring (24), and the inner ring surface of the adjusting ring (24) is provided with a plurality of arc-shaped protrusions (29). When the arc-shaped protrusions (29) are aligned with the sliders (4), the plurality of sliders (4) are relatively close to each other, and the plurality of arc-shaped plates (5) are just spliced ​​into a circular tube. When the arc-shaped protrusions (29) are misaligned with the sliders (4), under the action of the first spring, the plurality of sliders (4) are relatively far away from each other, and the plurality of arc-shaped plates (5) are also separated.

3. A soil frost heave deformation test system according to claim 2, characterized in that: The adjusting ring (24) is provided with a handle (25), and the adjusting ring (24) is provided with a locking screw (26).

4. A soil frost heave deformation test system according to claim 3, characterized in that: The lower side of each arc-shaped plate (5) is fixedly connected to a cutter (50).

5. A soil frost heave deformation test system according to claim 1, characterized in that: The outer side of the rotating disk (2) is fixedly connected to a gear ring (21), a motor (23) is mounted on the base plate (1), a gear (22) is fixedly connected to the main shaft of the motor (23), and the gear (22) is meshed with the gear ring (21).

6. A soil frost heave deformation test system according to claim 1, characterized in that: The base pipe (3) is provided with a latch pin (31), and the suspension rod (7) is provided with an insertion hole. When the latch pin (31) is inserted into the insertion hole, the pressing plate (6) is separated from the round pipe.

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