Testing device for testing lateral frost heaving force and displacement of frozen soil

Abstract

The invention provides a test device for testing lateral frost heaving force and displacement of frozen soil. Comprising a support fixing device, a sample cylinder fixed in the support fixing device, a plurality of first test assemblies arranged at intervals along the height direction of the sample cylinder and used for measuring lateral frost heaving displacement and lateral frost heaving force of frozen soil, and a plurality of second test assemblies arranged at intervals along the height direction of the sample cylinder and used for measuring vertical frost heaving displacement of the frozen soil, and the temperature control device is positioned on the bracket fixing device. The multiple first test assemblies are arranged at intervals in the height direction of the sample cylinder and used for measuring lateral frost heaving force and displacement at different height positions, and the multiple first test assemblies are arranged on the other side of the sample cylinder in the height direction and used for measuring vertical frost heaving displacement at different heights. The method is of great significance in engineering construction and frozen soil frost heaving theoretical research.

Description

Technical Field

[0001] The invention belongs to the technical field of frozen soil frost heave testing, and in particular relates to a test device for testing lateral frozen soil frost heave force and displacement. Background Art

[0002] Frozen soil is a layer of soil whose temperature always remains below 0°. It is mainly distributed in the northern region, especially in cold regions such as the Northeast, Northwest and Qinghai-Tibet Plateau. Frost heave is caused by the freezing of water in the soil and the growth of ice (especially convex mirror-shaped ice), which causes the soil to expand and the surface to rise unevenly. The frost heave phenomenon has an important impact on fields such as soil engineering, architectural design and agricultural activities. Understanding the mechanism and influencing factors of lateral displacement, lateral frost heave force and vertical displacement of frost heave will help engineers and researchers better predict and manage soil deformation and its potential risks in frozen soil areas.

[0003] At present, indoor research on frozen soil frost heave mainly focuses on limiting the frost heave force and frost heave displacement in the vertical direction of the soil. For example, CN202311777432.9 discloses a frozen soil frost heave force and displacement test device, which installs pressure sensors at different heights to measure the frost heave force at different positions and heights in the soil. By connecting resistors in a closed circuit, the real-time vertical displacement of each pressure sensor can be obtained, which is of great significance for studying the stress-strain development relationship and distribution along the depth during the frost heave process of the soil. This public patent mainly studies the frost heave force and frost heave displacement in the vertical direction, and cannot measure the lateral displacement at different heights, the lateral frost heave force, and the vertical displacement within a certain height range. Summary of the invention

[0004] The present invention aims to solve the technical problems existing in the prior art, and the purpose of the present invention is to provide a test device for testing the lateral frost heave force and displacement of frozen soil.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a test device for testing the lateral frost heave force and displacement of frozen soil, comprising a support fixing device, a sample tube fixed in the support fixing device for accommodating a soil sample, a plurality of first test assemblies for measuring the lateral frost heave displacement and lateral frost heave force of the frozen soil arranged at intervals in the height direction on one side of the sample tube, a plurality of second test assemblies for measuring the vertical frost heave displacement of the frozen soil arranged at intervals in the height direction on the other side of the sample tube, and a temperature control device arranged on the support fixing device for causing frost heave in the soil; two groups of test through holes are provided on the side wall of the sample tube, the two groups of test through holes are respectively a first test through hole and a second test through hole, and each group of test through holes includes a plurality of first test through holes arranged at intervals in the height direction A plurality of test through holes, wherein the height positions of the plurality of first test through holes and the plurality of second test through holes correspond one to one; the first test assembly comprises a first movable baffle which is radially slidably connected in the first test through hole and capable of closing the first test through hole, the first movable baffle being connected with a displacement sensor for measuring its radial outward displacement, and a lateral force measuring piece for measuring the lateral frost heave force causing the first movable baffle to move radially outward; the second test assembly comprises a second movable baffle which is radially slidably connected in the second test through hole and capable of closing the second test through hole, and a vertical movable rod which passes through the second movable baffle and is radially inserted into the sample tube and is vertically slidably connected to the second movable baffle, and a vertical displacement measuring piece for monitoring the vertical displacement of the vertical movable rod is provided outside the sample tube.

[0006] The above technical scheme, by setting multiple groups of first test components along the height direction of the sample tube, when the soil in the sample tube expands laterally, it will push the first movable baffle to undergo lateral displacement, and the displacement sensor and the lateral force measuring piece are used to measure the lateral displacement and lateral thrust of the first movable baffle respectively, so as to achieve the measurement of the lateral displacement and lateral frost heave force of soil at different heights; by setting multiple groups of second test components along the height direction of the sample tube, when the soil in the sample tube expands vertically, the vertical movable rod will move upward, and the vertical displacement measuring piece will measure the displacement of the vertical movable rod moving upward, so as to test the vertical frost heave displacement of the upper body at different heights at different times. The present invention can simultaneously measure the lateral displacement and lateral frost heave force at different heights, and the vertical displacement within a certain height range.

[0007] In a preferred embodiment of the present invention, the inner end of the displacement sensor is fixedly connected to the center position of the first movable baffle, the bracket fixing device has a bracket rod located outside the sample tube, the outer end of the displacement sensor passes through the bracket rod laterally and can slide laterally on the bracket rod, the lateral force measuring piece is a spring sleeved on the displacement sensor, and the two ends of the spring are respectively connected to the first movable baffle and the bracket rod.

[0008] In the above technical solution, the bracket rod supports the displacement sensor to increase the stability of the displacement sensor. The displacement measured by the displacement sensor is not only the lateral displacement of the frozen soil expansion, but also the compression of the spring. The lateral frost heave force can be obtained by multiplying the compression of the spring with the stiffness coefficient of the spring. At the same time, the lateral displacement and lateral frost heave force at different heights can be tested, and the structure is simple and reliable.

[0009] In a preferred embodiment of the present invention, the support rod has a plurality of guide holes spaced apart in the height direction and corresponding to the plurality of displacement sensors one by one, and the displacement sensors are laterally inserted into the guide holes and can slide therein.

[0010] The above technical solution guides the lateral movement of the displacement sensor by providing a guide hole, so that the moving direction of the displacement sensor is in the radial direction of the sample tube.

[0011] In a preferred embodiment of the present invention, the second movable baffle is vertically slidably connected to an outer guide plate outside the sample tube, the second movable baffle can move radially relative to the outer guide plate, and the vertical movable rod passes through the outer end of the second movable baffle and is fixedly connected to the outer guide plate.

[0012] In the above technical solution, the outer guide plate guides the vertical movement of the vertical moving rod and does not restrict the radial movement of the second moving baffle. When the soil frost heaves and produces displacement, the outer guide plate will move upward under the action of the vertical moving rod, and the movement will be smoother. In addition, by setting the outer guide plate, it is easier to observe the vertical displacement within a certain height range.

[0013] In a preferred embodiment of the present invention, the outer guide plate has a vertically extending strip groove, and the second movable baffle has a support ear inserted into the strip groove and slidable in the strip groove.

[0014] In the above technical solution, the strip groove allows the second movable baffle to be displaced laterally, and when the vertical movable rod and the outer guide plate move vertically, the strip groove and the lug guide their vertical movement.

[0015] In another preferred embodiment of the present invention, the vertical displacement measuring device includes a camera device mounted outside the sample tube, and a displacement scale line is provided on the outer wall of the sample tube near each second test through hole. The field of view of the camera device can cover the displacement scale lines and all vertical moving rods to obtain the vertical frost heave displacement of the upper body at different heights at different times.

[0016] In the above technical solution, when the soil body undergoes frost heave and displacement, the vertical displacement rod will move upward, and changes will occur on the displacement scale line. The video recording device will record the entire process, and by reading the displacement scale lines at different times in the recorded video, it is possible to observe the vertical frost heave displacement of the body at different times and positions.

[0017] In another preferred embodiment of the present invention, the vertically movable rod is a temperature sensor inserted into the sample tube and capable of measuring the temperature of frozen soil.

[0018] In the above technical solution, when the soil body undergoes frost heave and displacement, the temperature sensor can not only be moved upward to facilitate observation of the vertical frost heave displacement of the soil body, but the temperature sensor can also be used to monitor the frozen soil temperature.

[0019] In another preferred embodiment of the present invention, the test through hole is a rectangular through hole along the circumference of the side wall of the sample tube; and or the inner wall of the first test through hole / the second test through hole has a guide rail groove, and the first movable baffle / the second movable baffle has a guide rail column that is inserted into the guide rail groove and can slide therein.

[0020] The above technical solution guides the radial movement of the first movable baffle plate / the second movable baffle plate by providing the guide rail groove and the guide rail column, so that the movement thereof is smoother and more stable.

[0021] In another preferred embodiment of the present invention, the sample cylinder comprises a cylinder composed of a plurality of arc plates circumferentially spliced ​​together and detachably connected to a support fixing device, and the bottom and top of the sample cylinder are closed by a temperature control device; and / or the support fixing device comprises an upper fixing plate for fixing the upper end of the sample cylinder, a lower fixing plate for fixing the lower end of the sample cylinder, and a plurality of support rods arranged outside the sample cylinder, and the upper and lower ends of the support rods are detachably fixed to the upper fixing plate and the lower fixing plate, respectively.

[0022] With the above technical solution, after the test is completed, the sample tube can be quickly disassembled to expose the soil sample and measure the moisture content at different heights, thus providing a basis for studying the migration of water during frost heave.

[0023] In another preferred embodiment of the present invention, the temperature control device includes a lower temperature control plate fixedly connected to the bracket fixing device and capable of closing the bottom of the sample tube, and an upper temperature control plate movably connected to the bracket fixing device and capable of closing the top of the sample tube, and the upper temperature control plate and the lower temperature control plate are both provided with cold liquid channels inside, and the surfaces of the upper temperature control plate and the lower temperature control plate are both provided with liquid inlet holes and liquid outlet holes communicated with the cold liquid channels.

[0024] The above technical solution sets two temperature control plates, an upper temperature control plate and a lower temperature control plate, which can respectively control the temperature of the top and bottom ends of the soil in the sample tube, realize unidirectional freezing, and meet different test requirements.

[0025] Compared with the prior art, the superior technical solution of the present invention has the following beneficial effects: through the combined structure of the first movable baffle, the displacement sensor and the spring, the lateral displacement and lateral frost heave force of the soil at different heights can be measured; through the combined structure of the second movable baffle, the temperature sensor and the outer guide plate, the influence of the temperature sensor on the vertical frost heave displacement of the soil is weakened, and at the same time, the video is recorded by the camera device to realize the measurement of the vertical frost heave displacement at different heights; it plays an important role in studying the dynamic relationship between the force and displacement of the soil during the frost heave process, and is of great significance to engineering construction and theoretical research on frozen soil frost heave.

[0026] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0028] Figure 1 The present invention is a structural schematic diagram from a first perspective of a test device for testing lateral frost heave force and displacement of frozen soil according to an embodiment.

[0029] Figure 2 It is a structural schematic diagram from a second perspective of a test device for testing lateral frost heave force and displacement of frozen soil in an embodiment.

[0030] Figure 3 Schematic diagram of the structure of the first test component in the embodiment.

[0031] Figure 4 is a schematic diagram of the structure of the second test component in the embodiment.

[0032] Figure 5 Schematic diagram of the structure of the sample tube in the embodiment.

[0033] Figure 6 Schematic diagram of the structure of the bracket fixing device in the embodiment.

[0034] The figure marks in the drawings of the specification include: a bracket fixing device 10, an upper fixing plate 11, a lower fixing plate 12, a bracket rod 13, a nut 14, a guide hole 15, a sample tube 20, a first test through hole 21, a second test through hole 22, a guide groove 23, an arc plate 24, a displacement scale line 25, a first test component 30, a first movable baffle 31, a displacement sensor 32, a lateral force measuring piece (spring) 33, a hole groove 34, a support ear 35, a guide column 36, a second test component 40, a second movable baffle 41, a vertical movable rod (temperature sensor) 42, an outer guide plate 43, a sliding vertical hole 44, a strip groove 45, a support plate 46, a camera device 50, an upper temperature control plate 61, a lower temperature control plate 62, a liquid inlet hole 63, a liquid outlet hole 64, and a cable 70. DETAILED DESCRIPTION

[0035] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0036] In the description of the present invention, it is to be understood that the terms “longitudinal”, “lateral”, “vertical”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside” and “outside” etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0037] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0038] The present invention provides a test device for testing the lateral frost heave force and displacement of frozen soil. Figure 1 and Figure 2As shown, in a preferred embodiment, the test device includes a bracket fixing device 10, a sample tube 20 fixed in the bracket fixing device 10 for accommodating a soil sample, a plurality of first test components 30 for measuring the lateral frost heave displacement and lateral frost heave force of frozen soil arranged at intervals along the height direction of one side of the sample tube 20, a plurality of second test components 40 for measuring the vertical frost heave displacement of frozen soil arranged at intervals along the height direction of the other side of the sample tube 20, and a temperature control device arranged on the bracket fixing device 10 for causing frost heave in the soil, and the bracket fixing device 10 is used to install the sample tube 20 and the temperature control device.

[0039] like Figure 1 and Figure 6 As shown, in the present invention, the temperature control device includes a lower temperature control plate 62 fixedly connected to the bracket fixing device 10 and capable of closing the bottom of the sample tube 20, and an upper temperature control plate 61 (the upper temperature control plate 61 is also used as an upper cover) movably connected to the bracket fixing device 10 and capable of closing the top of the sample tube 20. The upper temperature control plate 61 and the lower temperature control plate 62 are both provided with cold liquid channels inside, and the surfaces of the upper temperature control plate 61 and the lower temperature control plate 62 are both provided with liquid inlet holes 63 and liquid outlet holes 64 communicating with the cold liquid channels. The liquid inlet holes 63 and the liquid outlet holes 64 are connected to the refrigeration device through pipelines, so that the cold liquid can circulate in the upper temperature control plate 61 and the lower temperature control plate 62. The temperature control device can be used to control the top and bottom temperatures of the soil in the sample tube 20 respectively to achieve one-way freezing; the soil contains water, and the freezing of water will increase the volume of the soil, thereby causing the entire soil to produce frost heave.

[0040] like Figure 5 As shown, there are two groups of test through holes on the side wall of the sample tube 20, which are respectively a first test through hole 21 and a second test through hole 22. The test through holes are rectangular through holes extending circumferentially along the side wall of the sample tube 20; each group of test through holes includes a plurality of test through holes arranged at intervals along the height direction, for example, four test through holes are arranged in each group, and the height positions of the plurality of first test through holes 21 and the plurality of second test through holes 22 correspond one to one, and preferably the two groups of test through holes are symmetrically arranged.

[0041] like Figure 1 , Figure 3 and Figure 5As shown, in the present invention, the first test assembly 30 includes a first movable baffle 31 that is radially slidably connected to the first test through hole 21 and can close the first test through hole 21. The first movable baffle 31 is an arc-shaped plate extending circumferentially along the side wall of the sample tube 20. The inner walls on the left and right sides of the first test through hole 21 are provided with guide rail grooves 23, and the first movable baffle 31 has a guide rail column 36 that is inserted into the guide rail groove 23 and can slide therein. Preferably, the first movable baffle 31 has ears 35 that fit the inner walls on the left and right sides of the first test through hole 21 on both sides, and the guide rail column 36 is arranged on the outer wall of the ear 35. The first movable baffle 31 is connected to a displacement sensor 32 for measuring its radial outward displacement, and a lateral force measuring member 33 for measuring the lateral frost heave force that causes the first movable baffle 31 to move radially outward. The displacement sensor 32 is connected to a terminal device (such as a computer, a mobile phone, a display touch screen, etc.) through a cable 70 for storing and displaying measurement data.

[0042] The inner end of the displacement sensor 32 is fixedly connected to the center position of the first movable baffle 31, for example, a hole groove 34 is dug at the center position of the first movable baffle 31 to fix the inner end of the displacement sensor 32, which can be fixed by gluing or clamping. The support fixing device 10 has a support rod 13 located outside the sample tube 20, and the outer end of the displacement sensor 32 passes through the support rod 13 horizontally and can slide horizontally on the support rod 13, for example, the support rod 13 has a plurality of guide holes 15 spaced along the height direction and corresponding to a plurality of displacement sensors 32, and the guide holes 15 are circular holes adapted to the shape of the displacement sensor 32, and the displacement sensor 32 is horizontally inserted into the guide holes 15 and can slide therein. The lateral force measuring member 33 is a spring sleeved on the displacement sensor 32, and the two ends of the spring 33 are respectively connected to the first movable baffle 31 and the support rod 13, for example, contact connection or fixed connection.

[0043] When the soil in the sample tube 20 freezes, the frozen water will increase the volume of the soil by 9%, causing the entire soil to frost heave. The soil will expand. When the soil expands laterally, it will push the first movable baffle 31 to move laterally. At the same time, the first movable baffle 31 will drive the displacement sensor 32 to move and compress the spring 33 to deform it. The displacement sensor 323 is connected to the terminal device to obtain real-time lateral displacement data. According to the formula F=kΔx ， The lateral frost heave force can be obtained by multiplying the real-time displacement measured by the displacement sensor 32 and the stiffness coefficient of the spring 33, wherein F is the lateral frost heave force, k is the stiffness coefficient of the spring 33, and Δx is the lateral displacement.

[0044] like Figure 2 , Figure 4 and Figure 5As shown, in the present invention, the second test assembly 40 includes a second movable baffle 41 radially slidably connected in the second test through hole 22 and capable of closing the second test through hole 22, and a vertical movable rod 42 radially inserted into the sample tube 20 through the second movable baffle 41 and vertically slidably connected to the second movable baffle 41, and the sample tube 20 is provided with a vertical displacement measuring member for monitoring the vertical displacement of the vertical movable rod 42. Among them, the structure of the second test through hole 22 is the same as that of the first test through hole 21, the structure of the second movable baffle 41 is the same as that of the first movable baffle 31, the inner walls of the left and right sides of the second test through hole 22 are also provided with guide rail grooves 23, and the two ears 35 of the second movable baffle 41 are also provided with guide rail columns 36 that are inserted into the guide rail grooves 23 and can slide therein. Preferably, the vertical movable rod 42 is a temperature sensor inserted into the sample tube 20 and capable of measuring the temperature of frozen soil, and the temperature sensor 42 is connected to the terminal device through a cable 70 for real-time display of the temperature of frozen soil.

[0045] like Figure 4 As shown, in another preferred embodiment, the second movable baffle 41 is vertically slidably connected with an outer guide plate 43 located outside the sample tube 20, the outer guide plate 43 is an arc-shaped plate, the second movable baffle 41 can move radially relative to the outer guide plate 43, the vertical movable rod 42 passes through the outer end of the second movable baffle 41 and is fixedly connected to the outer guide plate 43, and the outer guide plate 43 guides the vertical movement of the temperature sensor 42. A sliding vertical hole 44 is provided at the center of the second movable baffle 41, the lower end of the sliding vertical hole 44 is semicircular and fits the shape of the temperature sensor 42, and the upper part of the sliding vertical hole 44 is a rectangular through hole consistent with the diameter of the temperature sensor 42.

[0046] like Figure 4 As shown, in this embodiment, the left and right ends of the outer guide plate 43 have strip grooves 45 extending vertically and open at the lower end, and the ears 35 on both sides of the second movable baffle 41 are inserted into the strip grooves 45 and can slide in the strip grooves 45. The strip grooves 45 allow the second movable baffle 41 to move laterally, and the cooperation of the ears 35 and the strip grooves 45 guides the vertical movement of the outer guide plate 43. Preferably, a support plate 46 is further provided below the end of the second movable baffle 41, and the support plate 46 fixes the lowest height of the outer guide plate 43.

[0047] like Figure 4As shown, in the present invention, the vertical displacement measuring device includes a camera device 50 mounted outside the sample tube 20, and the outer wall of the sample tube 20 is provided with displacement scale lines 25 near the second test through hole 22. The field of view of the camera device 50 can cover the displacement scale lines 25, all vertical moving rods 42 and all outer guide plates 43, so as to obtain the vertical frost heave displacement of the upper body at different heights at different times. The signal output end of the camera device 50 is connected to the terminal device for reading and displaying the vertical frost heave displacement. When the soil body frost heaves and produces vertical displacement, the outer guide plate 43 will move upward under the action of the temperature sensor 42, and changes will occur on the displacement scale line 25. The camera device 50 can record the video throughout the process, and the vertical frost heave displacement of the upper body at different times and positions can be observed by reading the displacement scales at different times on the upper end of the outer guide plate 43 in the recorded video.

[0048] like Figure 5 As shown, in another preferred embodiment, the sample tube 20 includes a cylinder composed of a plurality of (for example, three) arc plates 24 spliced ​​circumferentially and detachably connected to the bracket fixture 10, and the bottom and top of the sample tube 20 are respectively closed by the lower temperature control plate 62 and the upper temperature control plate 61 of the temperature control device, and the upper temperature control plate 61 is movably connected to the bracket fixture 10. Therefore, after the test is completed, the sample tube 20 can be quickly disassembled to expose the soil sample and measure the moisture content at different heights, providing a basis for studying the migration of water during frost heave.

[0049] like Figure 1 and Figure 6 As shown, in the present invention, the support fixing device 10 includes an upper fixing plate 11 for fixing the upper end of the sample tube 20, a lower fixing plate 12 for fixing the lower end of the sample tube 20, and a plurality of support rods 13 arranged around the outside of the sample tube 20, and the upper and lower ends of the support rods 13 are detachably fixed to the upper fixing plate 11 and the lower fixing plate 12, respectively. Among them, the middle of the upper fixing plate 11 and the lower fixing plate 12 is a through hole and is provided with a step, the lower temperature control plate 62 is fixed in the through hole in the middle of the lower fixing plate 12, the sample tube 20 is spliced ​​and buckled together by three arc plates 24, but not fixed, the lower end of the sample tube 20 is inserted into the lower fixing plate 12 and limited by the step, and the lower fixing plate 12 is arranged outside the lower ends of the three arc plates 24 to ensure that they are tightly spliced; the upper fixing plate 11 is buckled at the upper end of the sample tube 20, the upper end of the sample tube 20 is inserted into the upper fixing plate 11 and limited by the step, and the upper fixing plate 11 is arranged outside the upper ends of the three arc plates 24 to ensure that they are tightly spliced; the two ends of the bracket rod 13 pass through the upper fixing plate 11 and the lower fixing plate 12 respectively, and the upper and lower ends are fixed with nuts 14, and the sample tube 20 spliced ​​by three arc plates 24 is guaranteed by the bracket fixing device 10 not to be deformed and to be tightly spliced, and the fixing device is detachable.

[0050] In this embodiment, the lower temperature control plate 62 is fixed on the lower fixed plate 12 to close the bottom of the sample tube 20, and the upper temperature control plate 61 is movably connected to the through hole in the middle of the upper fixed plate 11. When the sample tube 20 is filled with soil, the upper temperature control plate can be directly placed on the top of the soil through the through hole in the middle of the upper fixed plate 11. As the soil expands vertically due to frost heave, the upper temperature control plate moves upward a certain distance to adapt. It should be noted that, in order to facilitate the placement of the upper temperature control plate 61, a handle can be welded on the upper temperature control plate 61, or a tool can be used to place the upper temperature control plate 61 through the liquid inlet hole 63 and the liquid outlet hole 64 on the upper sealing plate.

[0051] In the description of this specification, the description with reference to the terms "preferred embodiment", "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0052] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A test device for testing lateral frost heave force and displacement of frozen soil, characterized in that: The invention comprises a support fixing device, a sample tube fixed in the support fixing device for accommodating a soil sample, a plurality of first test assemblies arranged at intervals along the height direction of one side of the sample tube for measuring the lateral frost heave displacement and the lateral frost heave force of the frozen soil, a plurality of second test assemblies arranged at intervals along the height direction of the other side of the sample tube for measuring the vertical frost heave displacement of the frozen soil, and a temperature control device arranged on the support fixing device for causing the soil to frost heave; The side wall of the sample cylinder is provided with two groups of test through holes, the two groups of test through holes are respectively a first test through hole and a second test through hole, each group of test through holes comprises a plurality of test through holes arranged at intervals along a height direction, and the height positions of the plurality of first test through holes and the plurality of second test through holes correspond one to one; The first test assembly includes a first movable baffle which is radially slidably connected in the first test through hole and capable of closing the first test through hole, the first movable baffle being connected to a displacement sensor for measuring its radial outward displacement, and a lateral force measuring member for measuring a lateral frost heave force causing the first movable baffle to move radially outward; The second test assembly includes a second movable baffle plate radially slidably connected to the second test through hole and capable of closing the second test through hole, and a vertical movable rod radially inserted into the sample tube through the second movable baffle plate and vertically slidably connected to the second movable baffle plate, and a vertical displacement measuring component for monitoring the vertical displacement of the vertical movable rod is provided outside the sample tube.

2. A test device for testing lateral frost heave force and displacement of frozen soil according to claim 1, characterized in that: The inner end of the displacement sensor is fixedly connected to the center position of the first movable baffle, the bracket fixing device has a bracket rod located outside the sample tube, the outer end of the displacement sensor passes through the bracket rod laterally and can slide laterally on the bracket rod, the lateral force measuring piece is a spring sleeved on the displacement sensor, and the two ends of the spring are respectively connected to the first movable baffle and the bracket rod.

3. A test device for testing lateral frost heave force and displacement of frozen soil according to claim 2, characterized in that: The support rod is provided with a plurality of guide holes spaced in the height direction and corresponding to the plurality of displacement sensors one by one. The displacement sensors are laterally inserted into the guide holes and can slide therein.

4. A test device for testing lateral frost heave force and displacement of frozen soil according to claim 1, characterized in that: The second movable baffle is vertically slidably connected with an outer guide plate outside the sample tube. The second movable baffle can move radially relative to the outer guide plate. The outer end of the vertical movable rod passes through the second movable baffle and is fixedly connected to the outer guide plate.

5. A test device for testing lateral frost heave force and displacement of frozen soil according to claim 4, characterized in that: The outer guide plate is provided with a strip groove which extends vertically and is open at the lower end, and the second movable baffle plate is provided with a support ear which is inserted into the strip groove and can slide in the strip groove.

6. A test device for testing lateral frost heave force and displacement of frozen soil according to claim 1, characterized in that: The vertical displacement measuring device includes a camera device mounted outside the sample tube. A displacement scale line is provided on the outer wall of the sample tube near each second test through hole. The field of view of the camera device can cover the displacement scale lines and all vertical moving rods to obtain the vertical frost heave displacement of the upper body at different heights at different times.

7. A test device for testing lateral frost heave force and displacement of frozen soil according to claim 1, characterized in that: The vertical moving rod is a temperature sensor inserted into the sample tube and capable of measuring the temperature of frozen soil.

8. A test device for testing lateral frost heave force and displacement of frozen soil according to claim 1, characterized in that: The test through hole is a rectangular through hole along the circumference of the side wall of the sample tube; And or the inner wall of the first test through hole / the second test through hole is provided with a guide rail groove, and the first movable baffle plate / the second movable baffle plate is provided with a guide rail column which is inserted into the guide rail groove and can slide therein.

9. A test device for testing lateral frost heave force and displacement of frozen soil according to any one of claims 1 to 8, characterized in that: The sample cylinder comprises a cylinder composed of a plurality of arc plates spliced ​​circumferentially and detachably connected to the bracket fixing device, and the bottom and top of the sample cylinder are sealed by the temperature control device; And / or the support fixing device includes an upper fixing plate for fixing the upper end of the sample tube, a lower fixing plate for fixing the lower end of the sample tube, and a plurality of support rods arranged around the outside of the sample tube, and the upper and lower ends of the support rods are respectively detachably fixed to the upper fixing plate and the lower fixing plate.

10. A test device for testing lateral frost heave force and displacement of frozen soil according to any one of claims 1 to 8, characterized in that: The temperature control device includes a lower temperature control plate fixedly connected to the bracket fixing device and capable of closing the bottom of the sample tube, and an upper temperature control plate movably connected to the bracket fixing device and capable of closing the top of the sample tube. The upper and lower temperature control plates are both provided with cold liquid channels inside, and the surfaces of the upper and lower temperature control plates are both provided with liquid inlet holes and liquid outlet holes communicating with the cold liquid channels.

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