A test device for testing lateral frost heave force and displacement of frozen soil

Abstract

The application provides a test device for testing lateral frost heaving force and displacement of frozen soil, which comprises a support fixing device, a sample cylinder fixed in the support fixing device, a plurality of first test components for measuring lateral frost heaving displacement and lateral frost heaving force and arranged at intervals along the height direction of the sample cylinder, a plurality of second test components for measuring vertical frost heaving displacement and arranged at intervals along the height direction of the sample cylinder, and a temperature control device located on the support fixing device. The plurality of first test components arranged at intervals along the height direction of the sample cylinder are used for measuring lateral frost heaving force and displacement at different height positions, and a plurality of first test components are arranged at intervals along the height direction on the other side of the sample cylinder, so that the measurement of vertical frost heaving displacement at different heights can be realized, which is of great significance to engineering construction and theoretical research on frost heaving of frozen soil.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of frozen soil frost heaving test, and particularly relates to a test device for testing lateral frost heaving force and displacement of frozen soil. BACKGROUND

[0002] Frozen soil is a soil layer whose temperature remains below 0°C, mainly distributed in northern regions, especially in cold regions such as Northeast China, Northwest China, and the Qinghai-Tibet Plateau. Frost heaving is caused by the freezing of water in the soil and the growth of ice bodies (especially convex mirror-shaped ice bodies), which causes the soil to expand and the ground surface to unevenly rise. Frost heaving has an important impact on soil engineering, building design, and agricultural activities. Understanding the mechanisms and influencing factors of lateral displacement, lateral frost heaving force, and vertical displacement of frost heaving helps engineers and researchers better predict and manage soil deformation and potential risks in frozen soil regions.

[0003] Current indoor research on frozen soil frost heaving mainly focuses on limiting the vertical frost heaving force and frost heaving displacement. For example, CN202311777432.9 discloses a frozen soil frost heaving force and displacement test device, which installs pressure sensors at different heights to measure the frost heaving force at different positions and heights in the soil. An electric resistance is connected in the closed circuit to obtain the real-time vertical displacement of each pressure sensor. This is of great significance for studying the stress-strain development relationship and depth distribution during the frost heaving process of the soil. The disclosed patent mainly studies the vertical frost heaving force and frost heaving displacement, and cannot measure the lateral displacement, lateral frost heaving force, and vertical displacement within a certain height range. SUMMARY

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

[0005] To achieve the above object, the present application adopts the following technical scheme: a test device for testing lateral frost heaving force and displacement of frozen soil, comprising a support fixing device, a sample cylinder for accommodating a soil sample fixed in the support fixing device, a plurality of first test assemblies for measuring lateral frost heaving displacement and lateral frost heaving force of the frozen soil, which are arranged along the height direction of one side of the sample cylinder, a plurality of second test assemblies for measuring vertical frost heaving displacement of the frozen soil, which are arranged along the height direction of the other side of the sample cylinder, and a temperature control device arranged on the support fixing device for causing the soil to have a frost heaving phenomenon; the lateral wall of the sample cylinder has two groups of test through holes, which are a first test through hole and a second test through hole, respectively, each group of test through holes comprises a plurality of test through holes arranged along the height direction, and the height positions of the plurality of first test through holes and the plurality of second test through holes correspond one by one; the first test assembly comprises a first movable baffle capable of closing the first test through hole, which is radially and slidingly connected in the first test through hole, a displacement sensor for measuring the radial outward displacement of the first movable baffle, and a lateral force measuring element for measuring the lateral frost heaving force causing the radial outward movement of the first movable baffle; the second test assembly comprises a second movable baffle capable of closing the second test through hole, which is radially and slidingly connected in the second test through hole, and a vertical movable rod which is radially inserted into the sample cylinder and vertically and slidingly connected with the second movable baffle, and the sample cylinder is externally provided with a vertical displacement measuring element for monitoring the vertical displacement of the vertical movable rod.

[0006] The above technical scheme, by arranging a plurality of first test assemblies along the height direction of the sample cylinder, when the soil in the sample cylinder has lateral expansion, the first movable baffle is pushed to have lateral displacement, and the displacement sensor and the lateral force measuring element are used to measure the lateral displacement and the lateral thrust of the first movable baffle, respectively, to realize the measurement of the lateral displacement and the lateral frost heaving force of the soil at different heights; by arranging a plurality of second test assemblies along the height direction of the sample cylinder, when the soil in the sample cylinder has vertical expansion, the vertical movable rod moves upward, and the vertical displacement of the vertical movable rod is measured by the vertical displacement measuring element to test the vertical frost heaving displacement of the soil at different heights at different times. The present application can simultaneously measure the lateral displacement, the lateral frost heaving force at different heights, and the vertical displacement within a certain height range.

[0007] In a preferred embodiment of the present application, the inner end of the displacement sensor is fixedly connected with the center position of the first movable baffle, the support fixing device has a support rod located outside the sample cylinder, the outer end of the displacement sensor transversely passes through the support rod and can transversely slide on the support rod, and the lateral force measuring element is a spring which is sleeved on the displacement sensor, and the two ends of the spring are respectively connected with the first movable baffle and the support rod.

[0008] The support rod supports the displacement sensor, thereby increasing the stability of the displacement sensor.

[0009] In a preferred embodiment of the present application, the support rod has a plurality of guide holes corresponding to the plurality of displacement sensors and spaced along the height direction, and the displacement sensors are transversely inserted into the guide holes and can slide in the guide holes.

[0010] The guide holes guide the transverse movement of the displacement sensors, so that the movement direction of the displacement sensors is in the radial direction of the sample cylinder.

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

[0012] The outer guide plate guides the vertical movement of the vertical movement rod and does not limit the radial movement of the second movable baffle. When the soil body expands and displaces, the outer guide plate will move upward under the action of the vertical movement rod, the movement is more stable, and the vertical displacement in a certain height range can be more easily observed by arranging the outer guide plate.

[0013] In a preferred embodiment of the present application, the outer guide plate has a vertically extending strip-shaped groove, and the second movable baffle has a lug inserted into the strip-shaped groove and can slide in the strip-shaped groove.

[0014] The strip-shaped groove allows the second movable baffle to displace laterally, and the strip-shaped groove and the lug guide the vertical movement of the vertical movement rod and the outer guide plate when they vertically move.

[0015] In another preferred embodiment of the present application, the vertical displacement measuring member includes a camera arranged outside the sample cylinder, and a displacement scale line is arranged on the outer wall of the sample cylinder near each second test through hole. The field of view of the camera can cover the displacement scale line and all vertical movement rods to obtain the vertical frost heaving displacement of the body at different positions and different times.

[0016] When the soil body expands and displaces, the vertical displacement rod moves upward and changes on the displacement scale line. The video recording device records the video throughout the process, and the vertical frost heaving displacement of the body at different positions and different times is observed by reading the displacement scale line at different times from the recorded video.

[0017] In another preferred embodiment of the present application, the vertical moving rod is a temperature sensor capable of measuring the temperature of frozen soil inserted into the sample cylinder.

[0018] The above technical solution, when the soil body generates frost heaving displacement, the temperature sensor not only moves upward to facilitate the observation of the vertical frost heaving displacement of the soil body, but also can be used for monitoring the temperature of frozen soil.

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

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

[0021] In another preferred embodiment of the present application, the sample cylinder includes a cylinder which is detachably connected with the support fixing device and is composed of a plurality of circular arc plates which are circumferentially spliced, and the bottom and top of the sample cylinder are closed by the temperature control device; and / or the support fixing device includes 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 which are annularly arranged outside the sample cylinder, and the upper and lower ends of the support rods are detachably fixed with the upper fixing plate and the lower fixing plate, respectively.

[0022] The above technical solution can quickly disassemble the sample cylinder after the test is completed, expose the soil sample, and determine the water content at different heights, thereby providing a basis for studying the water migration in the frost heaving process.

[0023] In another preferred embodiment of the present application, the temperature control device includes a lower temperature control plate which is fixed with the support fixing device and can close the bottom of the sample cylinder, and an upper temperature control plate which is movably connected with the support fixing device and can close the top of the sample cylinder, the inside of the upper temperature control plate and the lower temperature control plate is provided with a cold liquid channel, and the surface of the upper temperature control plate and the lower temperature control plate is provided with a liquid inlet hole and a liquid outlet hole which are communicated with the cold liquid channel.

[0024] The above technical solution sets two temperature control plates, i.e., the upper temperature control plate and the lower temperature control plate, so that the temperature of the top end and the bottom end of the soil body in the sample cylinder can be controlled respectively, one-way freezing is realized, and different testing requirements are met.

[0025] Compared with the prior art, the preferred technical scheme of the present application has the following beneficial effects: through the combination of the first movable baffle, the displacement sensor and the spring, the lateral displacement and the lateral frost heaving force of the soil body of different heights are measured; through the combination of the second movable baffle, the temperature sensor and the outer guide plate, the influence of the temperature sensor on the vertical frost heaving displacement of the soil body is weakened, and at the same time, the video recording by the camera device realizes the measurement of the vertical frost heaving displacement of different heights; the present application plays an important role in studying the dynamic relationship between force and displacement of the soil body during the frost heaving process, and has important significance for engineering construction and the theoretical research of frozen soil frost heaving.

[0026] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and / or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0027] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, taken in conjunction with the accompanying drawings, in which:

[0028] Figure 1 is a structural schematic view of a first perspective of a test device for testing lateral frost heaving force and displacement of frozen soil according to the embodiment.

[0029] Figure 2 is a structural schematic view of a second perspective of a test device for testing lateral frost heaving force and displacement of frozen soil according to the embodiment.

[0030] Figure 3 is a structural schematic view of a first test assembly according to the embodiment.

[0031] Figure 4 is a structural schematic view of a second test assembly according to the embodiment.

[0032] Figure 5 is a structural schematic view of a sample cylinder according to the embodiment.

[0033] Figure 6 is a structural schematic view of a support fixing device according to the embodiment.

[0034] The reference signs in the drawings of the specification include: support fixing device 10, upper fixing plate 11, lower fixing plate 12, support rod 13, nut 14, guide hole 15, sample cylinder 20, first test through hole 21, second test through hole 22, guide rail groove 23, circular arc plate 24, displacement scale line 25, first test assembly 30, first moving baffle 31, displacement sensor 32, lateral force measuring element (spring) 33, hole groove 34, supporting lug 35, guide rail column 36, second test assembly 40, second moving baffle 41, vertical moving rod (temperature sensor) 42, outer guide plate 43, sliding vertical hole 44, strip-shaped groove 45, supporting plate 46, camera 50, upper temperature control plate 61, lower temperature control plate 62, liquid inlet hole 63, liquid outlet hole 64, cable 70. DETAILED DESCRIPTION

[0035] Embodiments of the present application are described in detail below with reference to examples illustrated in the accompanying drawings, in which the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the accompanying drawings are exemplary and are intended only for the purpose of explaining the present application, and should not be understood as limiting the present application.

[0036] In the description of the present application, it should be understood that the terms "longitudinal", "transverse", "vertical", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be understood as limiting the present application.

[0037] In the description of the present application, unless otherwise specified and limited, it should be noted that the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be mechanical connection or electrical connection, it can be the communication between the two elements, it can be direct connection, or indirect connection through intermediate medium, and the specific meaning of the above terms can be understood by those skilled in the art according to the specific circumstances.

[0038] The present application provides a test device for testing lateral frost heave force and displacement of frozen soil, which comprises Figure 1 and Figure 2As shown in the preferred embodiment, the test device comprises a bracket fixing device 10, a sample cylinder 20 for accommodating a soil sample fixed in the bracket fixing device 10, a plurality of first test assemblies 30 for measuring lateral frost heave displacement and lateral frost heave force of frozen soil arranged along the height direction of one side of the sample cylinder 20, a plurality of second test assemblies 40 for measuring vertical frost heave displacement of frozen soil arranged along the height direction of the other side of the sample cylinder 20, and a temperature control device arranged on the bracket fixing device 10 for causing the soil to have a frost heaving phenomenon, the bracket fixing device 10 being used for mounting the sample cylinder 20 and the temperature control device.

[0039] As shown in the preferred embodiment, Figure 1 and Figure 6 In the present application, the temperature control device comprises a lower temperature control plate 62 capable of closing the bottom of the sample cylinder 20 fixed to the bracket fixing device 10, and an upper temperature control plate 61 (also used as an upper cover) capable of closing the top of the sample cylinder 20 movably connected to the bracket fixing device 10, the inside of the upper temperature control plate 61 and the lower temperature control plate 62 are each provided with a cold liquid channel, the surface of the upper temperature control plate 61 and the lower temperature control plate 62 is provided with a liquid inlet hole 63 and a liquid outlet hole 64 communicated with the cold liquid channel, the liquid inlet hole 63 and the liquid outlet hole 64 are connected with a refrigeration device through a pipeline, 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 control the temperature of the top and bottom of the soil in the sample cylinder 20 respectively, and realize one-way freezing; the soil contains water, and the freezing of water will cause the volume of the soil to increase, thereby causing the entire soil to have a frost heaving phenomenon.

[0040] As shown in the preferred embodiment, Figure 5 The side wall of the sample cylinder 20 has two groups of test through holes, which are a first test through hole 21 and a second test through hole 22, the test through hole is a rectangular through hole extending along the circumferential direction of the side wall of the sample cylinder 20; each group of test through holes comprises a plurality of test through holes arranged along the height direction, for example, four test through holes are arranged in each group, the height positions of the plurality of first test through holes 21 and the plurality of second test through holes 22 correspond one by one, and the two groups of test through holes are preferably symmetrically arranged.

[0041] As shown in the preferred embodiment, Figure 1 , Figure 3 and Figure 5As shown, in the present application, the first test assembly 30 comprises a first movable baffle 31 capable of closing the first test through-hole 21, which is radially slidingly connected in the first test through-hole 21, and the first movable baffle 31 is an arc-shaped plate extending along the circumference of the side wall of the sample cylinder 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 is provided with guide rail columns 36 that are clamped into and can slide in the guide rail grooves 23, and preferably the two sides of the first movable baffle 31 are provided with supporting ears 35 that fit the inner walls on the left and right sides of the first test through-hole 21, and the guide rail columns 36 are arranged on the outer walls of the supporting ears 35. The first movable baffle 31 is connected with a displacement sensor 32 for measuring the radial outward displacement of the first movable baffle 31, and a lateral force measuring element 33 for measuring the lateral frost heaving force that moves the first movable baffle 31 radially outward, and the displacement sensor 32 is connected with 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 fixed to the central position of the first movable baffle 31, such as a hole groove 34 is dug in the central position of the first movable baffle 31 to fix the inner end of the displacement sensor 32, which can be fixed by means of glue or clamping. The support fixing device 10 has a support rod 13 located outside the sample cylinder 20, and the outer end of the displacement sensor 32 transversely passes through and can slide on the support rod 13, such as the support rod 13 is provided with a plurality of guide holes 15 corresponding to the plurality of displacement sensors 32 and spaced along the height direction, and the guide holes 15 are circular holes that are adapted to the shape of the displacement sensor 32, and the displacement sensor 32 is transversely inserted into and can slide in the guide hole 15. The lateral force measuring element 33 is a spring that is sleeved on the displacement sensor 32, and the two ends of the spring 33 are respectively connected with the first movable baffle 31 and the support rod 13, such as contact connection or fixed connection.

[0043] When the soil in the sample cylinder 20 freezes, the water freezing will cause the volume of the soil to increase by 9%, thus causing the entire soil to freeze and expand, and the soil will expand laterally, which will push the first movable baffle 31 to move laterally, and at the same time the first movable baffle 31 will cause the displacement sensor 32 to move and compress the spring 33 to deform. The terminal device connected with the displacement sensor 323 can obtain real-time lateral displacement data, and according to the formula F=kΔx ， The real-time displacement measured by the displacement sensor 32 multiplied by the stiffness coefficient of the spring 33 can obtain the lateral frost heaving force, where F is the lateral frost heaving force, k is the stiffness coefficient of the spring 33, and Δx is the lateral displacement.

[0044] As Figure 2 , Figure 4 and Figure 5As shown in the figure, in the present application, the second test assembly 40 comprises a second movable baffle 41 capable of closing the second test through-hole 22, which is radially slidingly connected in the second test through-hole 22, and a vertical moving rod 42 inserted into the sample cylinder 20 through the second movable baffle 41 and vertically slidingly connected with the second movable baffle 41, and a vertical displacement measuring element is arranged outside the sample cylinder 20 for monitoring the vertical displacement of the vertical moving rod 42. Wherein, 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, and the inner walls on the left and right sides of the second test through-hole 22 also have guide rail grooves 23, and the two supporting ears 35 of the second movable baffle 41 also have guide rail columns 36 which are clamped into the guide rail grooves 23 and can slide therein. Preferably, the vertical moving rod 42 is a temperature sensor capable of measuring the temperature of frozen soil, which is connected with a terminal device through a cable 70 for real-time display of the temperature of frozen soil.

[0045] As shown in the figure, Figure 4 In another preferred embodiment, the second movable baffle 41 is vertically slidingly connected with an outer guide plate 43 located outside the sample cylinder 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 outer end of the vertical moving rod 42 passing through the second movable baffle 41 is fixedly connected with the outer guide plate 43, and the outer guide plate 43 guides the vertical movement of the temperature sensor 42. The center position of the second movable baffle 41 is provided with a sliding vertical hole 44, the lower end of the sliding vertical hole 44 is semicircular and matches 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] As shown in the figure, Figure 4 In the present embodiment, the left and right ends of the outer guide plate 43 have vertically extending strip-shaped grooves 45 with open lower ends, the supporting ears 35 on the two sides of the second movable baffle 41 are inserted into the strip-shaped grooves 45 and can slide in the strip-shaped grooves 45, the strip-shaped grooves 45 allow the second movable baffle 41 to have lateral displacement, and the cooperation of the supporting ears 35 and the strip-shaped grooves 45 guides the vertical movement of the outer guide plate 43. Preferably, the second movable baffle 41 also has a supporting plate 46 below the end portion, which fixes the lowest height of the outer guide plate 43.

[0047] As shown in the figure, Figure 4As shown in the present application, the vertical displacement measuring member includes a camera 50 arranged outside the sample cylinder 20, and displacement scale lines 25 are arranged on the outer wall of the sample cylinder 20 near the second test through hole 22. The field of view of the camera 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 heaving displacement of the body at different time and different height positions. The signal output end of the camera 50 is connected with a terminal device, which is used for reading and displaying the vertical frost heaving displacement. When the soil body generates vertical displacement due to frost heaving, the outer guide plate 43 will move upward under the action of the temperature sensor 42, and the displacement scale line 25 will change. The camera 50 can record the video throughout the process, and the displacement scale of the upper end of the outer guide plate 43 at different time can be read in the recorded video, so as to observe the vertical frost heaving displacement of the body at different time and different positions.

[0048] As shown in the present application, Figure 5 In another preferred embodiment, the sample cylinder 20 includes a cylinder which is detachably connected with the support fixing device 10 and is composed of a plurality of (for example, three) circular arc plates 24 which are circumferentially spliced together. The bottom and top of the sample cylinder 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 with the support fixing device 10. Therefore, after the test is completed, the sample cylinder 20 can be quickly disassembled to expose the soil sample, and the water content at different heights can be measured, which provides a basis for studying the water migration in the process of frost heaving.

[0049] As shown in the present application, Figure 1 and Figure 6 In the present application, the support fixing device 10 includes an upper fixing plate 11 for fixing the upper end of the sample cylinder 20, a lower fixing plate 12 for fixing the lower end of the sample cylinder 20, and a plurality of support rods 13 which are arranged around the sample cylinder 20. The upper and lower ends of the support rods 13 are respectively detachably fixed with the upper fixing plate 11 and the lower fixing plate 12. The middle of the upper fixing plate 11 and the lower fixing plate 12 is a through hole which is provided with a step, and the lower temperature control plate 62 is fixed in the through hole in the middle of the lower fixing plate 12. The sample cylinder 20 is spliced together by the three circular arc plates 24, but is not fixed. The lower end of the sample cylinder 20 is inserted into the lower fixing plate 12 and is limited by the step, and the lower fixing plate 12 is arranged around the lower end of the three circular arc plates 24 to ensure that they are tightly spliced together. The upper fixing plate 11 is arranged around the upper end of the sample cylinder 20, and the upper end of the sample cylinder 20 is inserted into the upper fixing plate 11 and is limited by the step. The upper fixing plate 11 is arranged around the upper end of the three circular arc plates 24 to ensure that they are tightly spliced together. The two ends of the support rods 13 pass through the upper fixing plate 11 and the lower fixing plate 12, and are fixed by nuts 14. The sample cylinder 20 which is spliced together by the three circular arc plates 24 is ensured not to be deformed and tightly spliced together by the support fixing device 10, and the fixing device is detachable.

[0050] In the present embodiment, the lower temperature control plate 62 is fixed on the lower fixed plate 12 to seal the bottom of the sample cylinder 20, and the upper temperature control plate 61 is movably connected in the through hole in the middle of the upper fixed plate 11. When the sample cylinder 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, and the upper temperature control plate moves upward by a certain distance to adapt to the vertical expansion of the soil when the soil freezes and swells. It should be noted that, in order to facilitate the taking and placing 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 take and 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 the present specification, the description of the terms "preferred embodiment", "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0052] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application 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 device 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 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 being respectively a first test through hole and a second test through hole, each group of test through holes comprising a plurality of test through holes spaced apart along a height direction, and the height positions of the plurality of first test through holes and the plurality of second test through holes being in one-to-one correspondence; The first test assembly includes a first movable baffle radially slidably connected to 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 the lateral frost heave force causing the first movable baffle to move radially outward; The second test assembly includes a second movable baffle 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 and vertically slidably connected to the second movable baffle. A vertical displacement measuring component is provided outside the sample tube for monitoring the vertical displacement of the vertical movable rod.

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, and the lateral force measuring member 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 along the height direction and corresponding to the plurality of displacement sensors one by one. The displacement sensors are inserted into the guide holes transversely 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 to 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 fixed 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 has an open lower end, and the second movable baffle 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 line 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 movable rod is a temperature sensor inserted into the sample tube and capable of measuring the temperature of frozen soil.

8. The 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 / the second movable baffle 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 bracket 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 multiple bracket rods arranged around the outside of the sample tube, and the upper and lower ends of the bracket 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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