A soft soil solidification freeze-thaw cycle test instrument

Abstract

The utility model discloses a kind of soft soil solidification freeze-thaw cycle test instruments, the utility model relates to freeze-thaw cycle equipment technical field, including test box, box cover and control center, the inside bottom end of test box is provided with several buckles, one test piece holding mechanism is placed in each buckle, test piece holding mechanism includes the test piece barrel of soft soil and barrel cover, test piece barrel inside is provided with holding cavity, the center of holding cavity is provided with center tube, inner wall is provided with four column cavities, one movable tube is inserted in each column cavity. When soft soil is watered, the movable tube is connected with the soft conduit to be dealt with, the center tube is connected with the soft conduit two, if surface water is used to water, the upper position of center tube and movable tube is drained, if groundwater is used to water, the lower position of center tube and movable tube is drained, to reach the real simulation soft soil freeze-thaw test is carried out.

Description

Technical Field

[0001] This utility model relates to the technical field of freeze-thaw cycle equipment, specifically a freeze-thaw cycle test instrument for soft soil solidification. Background Technology

[0002] Soft soil is a three-phase system composed of solid particles, water, and gas. Solid particles form the framework of soft soil, while water and air fill the pores within the framework. During freeze-thaw cycles, as temperature fluctuates, the water in soft soil undergoes phase changes, transforming from liquid water to solid ice or vice versa, in a continuous cycle.

[0003] Freeze-thaw cycle test chambers simulate the mechanical and physical changes that occur in soil after repeated freezing and thawing during the day and night of the seasons. In engineering, the number of freeze-thaw cycles is often used to evaluate the frost resistance of soil.

[0004] In real-world environments, surface water, such as rainwater, snowmelt, or irrigation water, seeps into soft soil, serving as a crucial pathway for its moisture replenishment. This surface water, along with groundwater, interacts to influence the moisture distribution and freeze-thaw behavior of soft soil. However, traditional freeze-thaw test chambers often employ unidirectional water replenishment methods, such as unidirectional water replenishment that only seeps down to the surface layer or simulates groundwater only along the bottom layer. Neither of these methods accurately reflects the freeze-thaw process of soft soil in a cold, open system. This limitation makes it difficult to determine the true impact of freeze-thaw cycles on soft soil. Therefore, this invention provides a freeze-thaw cycle testing instrument for soft soil solidification. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a soft soil solidification freeze-thaw cycle test instrument, which solves the problem that traditional freeze-thaw test chambers often use a one-way water replenishment method to replenish water to soft soil, making it difficult to determine the true impact of freeze-thaw cycles on soft soil.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: a soft soil solidification freeze-thaw cycle test instrument, including a test chamber, a chamber cover and a control center. The bottom of the test chamber is provided with several buckles, and each buckle contains a specimen holding mechanism. The specimen holding mechanism includes a specimen bucket for holding soft soil and a bucket cover. The specimen bucket has a holding cavity inside, a central tube is provided in the center of the holding cavity, and four column cavities are provided on the inner wall. A movable tube is inserted into each column cavity. The lid includes a cover plate covering the top of the specimen barrel. A locking block is provided on the top of the cover plate. An interface is provided on the top of the locking block, and four flexible conduits (first type) communicating with its interior are provided at the bottom. All four flexible conduits (first type) pass through the cover plate and are respectively connected to the top of the movable tube. A flexible conduit (second type) communicating with its interior is also provided at the center of the bottom of the locking block. The flexible conduit (second type) passes through the cover plate and is connected to the top of the central tube.

[0007] Preferably, the column cavity and the holding cavity are interconnected, and the cross-sectional arc length of the column cavity is smaller than the cross-sectional arc length of the movable tube, with the four column cavities equidistantly distributed on the side of the holding cavity.

[0008] Preferably, the side of the central tube has four rows of vertical drainage holes from top to bottom, with the four rows of drainage holes facing the front, back, left, and right directions of the specimen barrel.

[0009] Preferably, the four movable tubes have a row of drainage holes vertically formed on their sides from top to bottom, and both the central tube and the movable tubes have a structure that is closed at the bottom and open at the top.

[0010] Preferably, a water supply tank is installed on the outer top of the tank cover, and several slots are provided on the inner top of the tank cover for engaging the locking blocks.

[0011] Preferably, the slot has a circular drain port that communicates with the inside of the water tank for connecting the interface. The diameter of the drain port is smaller than the diameter of the interface. The water tank is equipped with a pressurizing device to promote drainage, and the pressurizing device is controlled by a control center.

[0012] Beneficial effects This invention provides an instrument for testing the freeze-thaw cycle of soft soil solidification. Compared with the prior art, it has the following advantages: 1. This soft soil solidification freeze-thaw cycle test instrument uses several specimen holding mechanisms set up in the test chamber to fill the holding cavity with soft soil. The central tube passes through the middle of the soft soil. When water is added to the soft soil, the movable tube is connected to the corresponding soft conduit one, and the central tube is connected to the soft conduit two. The pressurization device controlled by the control center discharges water from the water tank to the soft soil. If surface water is needed for water replenishment, water is passed through the drainage holes at the top of the central tube and the movable tube. If groundwater is needed for water replenishment, water is passed through the drainage holes at the bottom of the central tube and the movable tube, so as to achieve a realistic simulation of the soft soil freeze-thaw test.

[0013] 2. This soft soil solidification freeze-thaw cycle test instrument changes the opening and closing status of some drainage holes by filling the central tube and movable tube with sealing columns or by putting a sealing sleeve on the outside of the central tube. This achieves the effect of stratifying the soft soil in the holding chamber, making the freeze-thaw test more in line with the diversity and realism of the natural environment. Attached Figure Description

[0014] Figure 1 This is a three-dimensional appearance schematic diagram of the present utility model; Figure 2 This is a schematic diagram showing the disassembled test chamber and its internal specimen holding mechanism of the present invention. Figure 3This is a three-dimensional view of the experimental chamber of this utility model. Figure 4 This is a three-dimensional appearance schematic diagram of the specimen holding mechanism of this utility model; Figure 5 This is a schematic diagram of the internal structure of the specimen container of this utility model.

[0015] In the diagram: 1. Test chamber; 11. Bayonet; 2. Chamber cover; 21. Water supply tank; 22. Slot; 23. Drain outlet; 3. Specimen holding mechanism; 31. Specimen bucket; 311. Holding cavity; 312. Central tube; 313. Column cavity; 314. Movable tube; 32. Cover plate; 321. Locking block; 322. Interface; 323. Flexible conduit one; 324. Flexible conduit two; 4. Control center. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] This utility model provides two technical solutions: Figures 1-5 The first embodiment is shown: a soft soil solidification freeze-thaw cycle test instrument, including a test chamber 1, a chamber cover 2 and a control center 4. The bottom of the test chamber 1 is provided with several buckles 11. Each buckle 11 contains a specimen holding mechanism 3. The specimen holding mechanism 3 includes a specimen bucket 31 for holding soft soil and a bucket cover. The specimen bucket 31 has a holding cavity 311 inside. A central tube 312 is provided in the center of the holding cavity 311 and four column cavities 313 are provided on the inner wall. A movable tube 314 is inserted into each column cavity 313. The four column cavities 313 are the same size. The movable tube 314 can rotate inside the column cavity 313. The central tube 312 is fixed to the bottom of the holding cavity 311. After the soft soil is filled into the holding cavity 311, it forms a column structure. The central tube 312 vertically penetrates the center of the soft soil. The column cavity 313 is interconnected with the holding cavity 311, and the arc length of the cross section of the column cavity 313 is smaller than the arc length of the cross section of the movable tube 314. The four column cavities 313 are equidistantly distributed on the side of the holding cavity 311. A row of drainage holes is vertically opened on the side of the four movable tubes 314 from top to bottom. The central tube 312 and the movable tube 314 are both structures with closed bottom and open top. Rotating the movable tube 314 can transfer the drainage hole on one side. When the drainage hole on one side is exposed in the holding cavity 311, water can be discharged into the soft soil in the holding cavity 311. When the drainage hole on one side is rotated to fit against the inner wall of the column cavity 313, water is no longer discharged into the soft soil in the holding cavity 311, thereby changing the open and closed state of the drainage hole on the movable tube 314. The central tube 312 has four rows of vertical drainage holes on its side, which face the front, back, left, and right sides of the specimen container 31. The four rows of drainage holes can drain water to different directions in the soft soil in the holding chamber 311. The drainage holes are distributed from top to bottom, which can replenish water to different depths of the soft soil or replenish water in layers. When draining water along the drainage holes of the central tube 312, the opening and closing state of some drainage holes can be changed by filling the inside with sealing columns or by putting a sealing sleeve on the outside, so as to facilitate the realistic simulation of the soft soil freeze-thaw test.

[0018] Figure 3-5 The second embodiment is shown. The main difference from the first embodiment is that the lid includes a cover plate 32 covering the top of the specimen barrel 31. The top of the cover plate 32 is provided with a locking block 321. The top of the locking block 321 has an interface 322, and the bottom is provided with four flexible conduits 323 communicating with its interior. The four flexible conduits 323 all pass through the cover plate 32 and are respectively connected to the top of the movable tube 314. The bottom center of the locking block 321 is also provided with a flexible conduit 324 communicating with its interior. The flexible conduit 324 passes through the cover plate 32 and is connected to the top of the central tube 312. According to the required water replenishment position, the movable tube 314 at different positions is connected to the corresponding flexible conduit 323. The movable tube 314 that is not used can be rotated to the drain hole on one side to fit against the inner wall of the column cavity 313 to close the drain hole, or the flexible conduit 323 connected to the top of the movable tube 314 can be clamped with a clamp to close the water supply.

[0019] Furthermore, a water supply tank 21 is installed on the outer top of the cover 2, and several slots 22 are opened on the inner top of the cover 2 for engaging the locking block 321. The slots 22 have circular drain outlets 23 that communicate with the inside of the water supply tank 21 for connecting the interface 322. The diameter of the drain outlet 23 is smaller than the diameter of the interface 322. A pressurizing device to promote drainage is installed inside the water supply tank 21. The pressurizing device is controlled by the control center 4 to apply pressure and set the lengths of the first flexible conduit 323 and the second flexible conduit 324 to be long enough so that the cover 2 has sufficient mobility when opening and closing. When replenishing water to the soft soil, the locking block 321 is engaged in the slot 22 so that the interface 322 is tightly connected to the drain outlet 23. The pressurizing device is controlled by the control center 4 to drain the water in the water supply tank 21 along the first flexible conduit 323 and the second flexible conduit 324 to the movable pipe 314 and the central pipe 312 respectively, realizing multi-directional water replenishment.

[0020] Working principle: When replenishing water to soft soil, the locking block 321 is engaged in the locking groove 22, so that the interface 322 is tightly connected to the drainage port 23. The movable pipe 314 at the desired position is connected to the corresponding soft conduit 323, and the central pipe 312 is connected to the soft conduit 324. The movable pipe 314 that is not in use can be rotated to the side of its drainage hole until it fits against the inner wall of the column cavity 313, thereby closing the drainage hole. The four rows of drainage holes of the central pipe 312 can drain water to different directions in the soft soil in the holding cavity 311. The drainage holes are distributed from top to bottom, which can replenish water to different depths of soft soil or perform layered water replenishment. The control center 4 controls the pressurization device to discharge the drainage in the water supply tank 21 through the flexible conduit 323 and the flexible conduit 324 to the movable pipe 314 and the central pipe 312 respectively, so as to achieve multi-directional water replenishment. The opening and closing status of some drainage holes can be changed by filling the central pipe 312 and the movable pipe 314 with sealing columns or by putting a sealing sleeve on the outside of the central pipe 312. If surface water is needed for water replenishment, the drainage holes at the top of the central pipe 312 and the movable pipe 314 are kept open. If groundwater is needed for water replenishment, the drainage holes at the bottom of the central pipe 312 and the movable pipe 314 are kept open, so as to achieve a realistic simulation of the soft soil freeze-thaw test.

[0021] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0022] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A soft soil solidification freeze-thaw cycle test instrument, comprising a test chamber (1), a chamber cover (2), and a control center (4), characterized in that: The test chamber (1) has several buckles (11) at the bottom of the chamber. Each buckle (11) contains a specimen holding mechanism (3). The specimen holding mechanism (3) includes a specimen bucket (31) for holding soft soil and a bucket lid. The specimen bucket (31) has a holding cavity (311) inside. The center of the holding cavity (311) has a central tube (312) and four column cavities (313) on the inner wall. Each column cavity (313) has a movable tube (314) inserted into it. The lid includes a cover plate (32) covering the top of the test specimen container (31). The top of the cover plate (32) is provided with a locking block (321). The top of the locking block (321) is provided with an interface (322), and the bottom is provided with four flexible conduits (323) communicating with its interior. The four flexible conduits (323) all pass through the cover plate (32) and are respectively connected to the top of the movable tube (314). The bottom center of the locking block (321) is also provided with a flexible conduit (324) communicating with its interior. The flexible conduit (324) passes through the cover plate (32) and is connected to the top of the central tube (312).

2. The soft soil solidification freeze-thaw cycle test instrument according to claim 1, characterized in that: The column cavity (313) is interconnected with the container cavity (311), and the cross-sectional arc length of the column cavity (313) is smaller than the cross-sectional arc length of the movable tube (314). The four column cavities (313) are equidistantly distributed on the side of the container cavity (311).

3. The soft soil solidification freeze-thaw cycle test instrument according to claim 1, characterized in that: The central tube (312) has four rows of vertical drainage holes on its side from top to bottom, with the four rows of drainage holes facing the front, back, left, and right directions of the specimen bucket (31).

4. The soft soil solidification freeze-thaw cycle test instrument according to claim 1, characterized in that: The four movable tubes (314) have a row of drainage holes vertically opened on their sides from top to bottom. Both the central tube (312) and the movable tubes (314) have a structure that is closed at the bottom and open at the top.

5. The soft soil solidification freeze-thaw cycle test instrument according to claim 1, characterized in that: The top of the outer side of the cover (2) is equipped with a water tank (21), and the top of the inner side of the cover (2) is provided with several slots (22) for engaging the card block (321).

6. The soft soil solidification freeze-thaw cycle test instrument according to claim 5, characterized in that: The slot (22) has a circular drain port (23) that communicates with the inside of the water tank (21) for connecting the interface (322) to it. The diameter of the drain port (23) is smaller than the diameter of the interface (322). The water tank (21) is equipped with a pressurizing device to promote drainage. The pressurizing device is controlled by the control center (4).

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