Solidified soil corrosion test device in flowing salt solution erosion environment and use method

Abstract

The invention discloses a solidified soil corrosion test device in a flowing salt solution corrosion environment and a use method. The device comprises a salt solution placing pool, a controllable pressure type water suction pump, a control valve and a test piece placing chamber which are sequentially connected end to end through a pipeline, wherein the pressure-controllable water suction pump can be used for carrying out pressurization and pressure maintaining control, and the flow velocity of a salt solution can be adjusted as required; the test piece placing chamber comprises a cylinder chamber and a placing frame, one axial end of the cylinder chamber is an inlet end of a salt solution, the other axial end of the cylinder chamber is an outlet end of the salt solution, and the placing frame is adaptively placed in a hollow cavity of the cylinder chamber in the axial direction of the cylinder chamber and used for supporting and fixing a solidified soil test piece so that the solidified soil test piece can be located in the middle of the cylinder chamber; the solidified soil test piece is positioned in the middle of the flowing salt solution. The device can be used for researching the corrosion effect of a salt erosion solution on a stabilized soil material in a running water environment, can also be used for researching stabilized soil deformation and strength degradation and damage mechanisms under the hydraulic-erosion coupling effect, and is simple in structure and convenient to use.

Description

Technical Field

[0001] The present invention relates to the field of geotechnical engineering simulation tests, and particularly to a dissolution test device for solidified soil under a flowing salt solution erosion environment and a using method thereof. Background Art

[0002] As a kind of cement-based material, solidified soil has initial defects such as micro-pores and micro-cracks, which will exacerbate the action of erosion media in the service environment and damage its original structure, thus affecting the long-term performance during the engineering use process. And the widely distributed salt lake regions in China result in a large number of projects in the salt erosion environment, and the engineering structures in the salt erosion environment are often also affected by the hydraulic action of water flow scouring. This hydraulic-erosion coupling action seriously affects the service life of engineering structures.

[0003] However, in the prior art, in order to study the service performance of cement-based materials in the salt erosion environment, domestic and foreign scholars mostly simulate it by soaking in a salt solution under a static water state, so the simulation of the salt erosion environment is partial. In view of this, it is necessary to design a dissolution test device for solidified soil under a flowing salt solution erosion environment and a using method thereof to solve the above problems. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. For this reason, an object of the present invention is to provide a dissolution test device for solidified soil under a flowing salt solution erosion environment, which can realize the dissolution test of solidified soil specimens in a salt solution erosion environment at different flow rates, reduce the displacement influence of the scouring force of the salt solution fluid action on the solidified soil specimens, can be used to study the dissolution effect of salt erosion solution on solidified soil materials in a flowing water environment, and can also be used to study the deformation, strength deterioration and failure mechanism of solidified soil under the coupling action of hydraulic-erosion. The structure is simple and the use is convenient.

[0005] According to an embodiment of the present invention, the dissolution test device for solidified soil under a flowing salt solution erosion environment includes a salt solution placement pool, a controllable pressure water pump, a control valve and a specimen placement chamber, which are connected in sequence head to tail through pipelines;

[0006] Wherein, the salt solution placement pool is used for storing salt solution;

[0007] The controllable pressure water pump is used to make the salt solution in the salt solution placement pool flow through the controllable pressure water pump, the control valve, the specimen placement chamber in sequence, and then return to the salt solution placement pool; the controllable pressure water pump can perform pressurization and pressure maintenance control and adjust the flow rate of the salt solution as needed;

[0008] The control valve is used to control the salt solution to enter and exit the specimen placement chamber;

[0009] The specimen placement chamber includes a cylindrical chamber and a placement rack. One axial end of the cylindrical chamber is the inlet end of the salt solution, and the other axial end of the cylindrical chamber is the outlet end of the salt solution. The placement rack is axially and adaptively placed in the hollow cavity of the cylindrical chamber. The placement rack is used to support and fix the solidified soil specimen, so that the solidified soil specimen is located in the middle of the cylindrical chamber, ensuring that the solidified soil specimen is located in the middle of the flowing salt solution.

[0010] When the solidified soil dissolution test device under the flowing salt solution erosion environment of the embodiment of the present invention is in use, first connect the salt solution placement pool, the controllable pressure type water pump and the control valve with pipelines. Place the solidified soil specimen in the placement rack, and place the placement rack with the solidified soil specimen axially into the hollow cavity of the cylindrical chamber. Then connect the two axial ends of the cylindrical chamber to the control valve and the salt solution placement pool through pipelines respectively; after the installation is completed, adjust the controllable pressure type water pump to the required pressure, and open the control valve to complete the filling and flowing circulation of the salt solution in the solidified soil dissolution test device under the flowing salt solution erosion environment of the embodiment of the present invention, and realize the erosion effect of the flowing salt solution on the solidified soil specimen. Thus, the assembly and test operation of the solidified soil dissolution test device under the flowing salt solution erosion environment of the embodiment of the present invention are convenient and fast, and the solidified soil dissolution test under the flowing salt solution erosion environment can be realized.

[0011] The solidified soil dissolution test device under the flowing salt solution erosion environment of the embodiment of the present invention has the following technical advantages: on the one hand, by designing the controllable pressure type water pump and the salt solution flowing circulation, the dissolution test of the solidified soil specimen in the salt solution erosion environment at different flow rates can be realized, which improves the authenticity of the simulation test of the solidified soil specimen in the salt erosion environment and has excellent promotion prospects; on the other hand, the specimen placement chamber includes the cylindrical chamber and the placement rack placed in the cylindrical chamber. The placement rack can support and fix the solidified soil specimen, ensure that the solidified soil specimen is located at the central position of the flowing salt solution, and does not shift when being completely scoured and eroded by the salt solution fluid, and maximally reduces the displacement influence of the scouring force of the salt solution fluid on the solidified soil specimen. The solidified soil dissolution test device under the flowing salt solution erosion environment of the embodiment of the present invention has a simple structure, convenient and fast assembly and test operation, good promotion and application prospects, can be used to study the dissolution effect of salt erosion solution on solidified soil materials in a flowing water environment, and can also be used to study the deformation, strength deterioration and failure mechanism of solidified soil under the coupling action of hydraulic erosion.

[0012] In some embodiments, the cylindrical chamber includes an end cover and a cylindrical chamber body; the end cover is detachably fixed at the end opening of the cylindrical chamber body.

[0013] In some embodiments, the placement rack includes a first ring group, a second ring group, and a support bar group; the first ring group and the second ring group are arranged axially spaced apart from each other and fixed by the support bar group; the first ring group includes a first outer ring and a first inner ring located inside the first outer ring, the second ring group includes a second outer ring, a second inner ring located inside the second outer ring, and a fixed ring located inside the second inner ring, wherein the first outer ring and the second outer ring are abutted and supported on the inner peripheral wall of the cylinder chamber, the first inner ring and the second inner ring are adapted to receive the solidified soil specimen, and the fixed ring is adapted to abut against one end face of the solidified soil specimen.

[0014] In some embodiments, the support bar group includes a first support bar, a second support bar, a third support bar, an outer support bar, and an inner support bar; the first support bar is connected between the first outer ring and the first inner ring, the second support bar is connected between the second outer ring and the second inner ring, the third support bar is connected between the second inner ring and the fixed ring, the outer support bar is connected between the first outer ring and the second outer ring, and the inner support bar is connected between the first inner ring and the second inner ring.

[0015] In some embodiments, the first support bar, the second support bar, the third support bar, the outer support bar, and the inner support bar are all straight bars.

[0016] In some embodiments, the first outer ring does not protrude axially beyond the first inner ring; the second outer ring protrudes axially beyond the second inner ring and the fixed ring.

[0017] In some embodiments, there are multiple placement racks, and the multiple placement racks are sequentially placed in the hollow cavity of the cylinder chamber along the axial direction of the cylinder chamber.

[0018] In some embodiments, there are multiple control valves and multiple specimen placement chambers with the same quantity, and the multiple control valves are connected in series with the multiple specimen placement chambers one by one to form multiple control valve - specimen placement chamber series units, and the multiple control valve - specimen placement chamber series units are connected in parallel between the controllable pressure pump and the salt solution placement pool.

[0019] In some embodiments, the salt solution placement pool is made of corrosion - resistant material, and a switchable solution inlet and outlet is provided at the bottom of the salt solution placement pool.

[0020] The present invention also provides a method for using the solidified soil dissolution test device in a flowing salt solution erosion environment according to the above - mentioned embodiments of the present invention.

[0021] The method for using the solidified soil dissolution test device in a flowing salt solution erosion environment according to the embodiments of the present invention includes the following steps:

[0022] S1: First, connect the salt solution placement tank, the controllable pressure water pump, and the control valve with pipelines. Place the solidified soil specimen in the placement rack, and then place the placement rack with the solidified soil specimen axially into the hollow cavity of the cylinder chamber along the axial direction of the cylinder chamber. Next, connect the two axial ends of the cylinder chamber to the control valve and the salt solution placement tank respectively through pipelines.

[0023] S2: After the installation in step S1 is completed, adjust the controllable pressure water pump to the required pressure, and open the control valve to complete the filling and flowing circulation of the salt solution in the solidified soil dissolution test device under the flowing salt solution erosion environment, so as to realize the erosion effect of the flowing salt solution on the solidified soil specimen.

[0024] Thus, the assembly and test operation of the solidified soil dissolution test device under the flowing salt solution erosion environment according to the embodiments of the present invention are convenient and fast. It can realize the dissolution test of solidified soil specimens in the salt solution erosion environment at different flow rates, reduce the displacement influence of the scouring force of the salt solution fluid on the solidified soil specimens, and can be used to study the dissolution effect of salt erosion solution on solidified soil materials in the flowing water environment, and can also be used to study the deformation, strength deterioration and failure mechanism of solidified soil under the coupling action of hydraulic erosion. The structure is simple and the use is convenient.

[0025] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0027] Figure 1 is a schematic structural diagram of the solidified soil dissolution test device under the flowing salt solution erosion environment according to the embodiment of the present invention;

[0028] Figure 2 is Figure 1 a schematic diagram of the control valve and the specimen placement chamber in

[0029] Figure 3 is Figure 1 a schematic diagram of the internal structure of the specimen placement chamber in

[0030] Figure 4 is Figure 3 a schematic diagram of the structure of the placement rack in

[0031] Reference numerals:

[0032] Salt solution storage tank 1; Solution inlet and outlet 101; Sealing cover 102; Controllable pressure water pump 2; Control valve 3; Specimen placement chamber 4; Cylinder chamber 401; End cover 4011; Cylinder chamber body 4012; Placement rack 402; First ring group 4021; First outer ring 40211; First inner ring 40212; Second ring group 4022; Second outer ring 40221; Second inner ring 40222; Fixed ring 40223; Support bar group 4023; First support bar 40231; Second support bar 40232; Third support bar 40233; Outer support bar 40234; Support bar 40235. Detailed implementation manners

[0033] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0034] The following will be combined with Figures 1 to 4 to describe the erosion test device and usage method of solidified soil under a flowing salt solution erosion environment according to the embodiments of the present invention.

[0035] As Figures 1 to 4As shown in the figure, the apparatus for the erosion test of solidified soil under the flowing salt solution erosion environment according to the embodiment of the present invention includes a salt solution storage tank 1, a controllable pressure water pump 2, a control valve 3, and a specimen placement chamber 4 that are connected in sequence at the head and tail through pipelines. The salt solution storage tank 1, the controllable pressure water pump 2, the control valve 3, and the specimen placement chamber 4 are connected in sequence at the head and tail through pipelines to form a circulation loop. Among them, the salt solution storage tank 1 is used to store salt solution. The controllable pressure water pump 2 provides power to make the salt solution in the salt solution storage tank 1 flow through the controllable pressure water pump 2, the control valve 3, and the specimen placement chamber 4 in sequence, and then return to the salt solution storage tank 1, so as to realize the filling and flowing circulation of the salt solution in the apparatus for the erosion test of solidified soil under the flowing salt solution erosion environment according to the embodiment of the present invention, and realize the erosion effect of the flowing salt solution on the solidified soil specimen. The controllable pressure water pump 2 can perform pressure boosting and pressure maintaining control, and adjust the flow rate of the salt solution according to needs, so as to realize the simulation test of the solidified soil specimen under the flowing salt solution erosion environment with different flow rates. The control valve 3 is used to control the salt solution to enter and exit the specimen placement chamber 4. The specimen placement chamber 4 includes a cylindrical chamber 401 and a placement rack 402. One axial end of the cylindrical chamber 401 is the inlet end of the salt solution, and the other axial end of the cylindrical chamber 401 is the outlet end of the salt solution. The placement rack 402 is adaptively placed in the hollow cavity of the cylindrical chamber 401 along the axial direction of the cylindrical chamber 401, and the placement rack 402 can also be taken out of the cylindrical chamber 401 along the axial direction of the cylindrical chamber 401. The placement rack 402 is used to support and fix the solidified soil specimen, so that the solidified soil specimen is located in the middle of the cylindrical chamber 401, ensuring that the solidified soil specimen is located in the middle of the flowing salt solution; the placement rack 402 does not interfere with the erosion effect of the flowing salt solution on the solidified soil specimen.

[0036] When the apparatus for the erosion test of solidified soil under the flowing salt solution erosion environment according to the embodiment of the present invention is used, first connect the salt solution storage tank 1, the controllable pressure water pump 2, and the control valve 3 with pipelines, place the solidified soil specimen in the placement rack 402, place the placement rack 402 with the solidified soil specimen along the axial direction into the hollow cavity of the cylindrical chamber 401, and then connect the two axial ends of the cylindrical chamber 401 with the control valve 3 and the salt solution storage tank 1 through pipelines respectively; after the installation is completed, adjust the controllable pressure water pump 2 to the required pressure, and open the control valve 3 to complete the filling and flowing circulation of the salt solution in the apparatus for the erosion test of solidified soil under the flowing salt solution erosion environment according to the embodiment of the present invention, and realize the erosion effect of the flowing salt solution on the solidified soil specimen. Thus, the assembly and test operation of the apparatus for the erosion test of solidified soil under the flowing salt solution erosion environment according to the embodiment of the present invention are convenient and fast, and the erosion test of solidified soil under the flowing salt solution erosion environment can be realized.

[0037] The dissolution test device for solidified soil under the erosion environment of flowing salt solution according to the embodiments of the present invention has the following technical advantages: on the one hand, by designing a controllable-pressure water pump 2 and a salt solution flow cycle, the dissolution test of solidified soil specimens in the salt solution erosion environment at different flow rates can be realized, improving the authenticity of the simulation test of solidified soil specimens in the salt erosion environment and having excellent promotion prospects; on the other hand, the specimen placement chamber 4 includes a cylinder chamber 401 and a placement rack 402 placed in the cylinder chamber 401. The placement rack 402 can support and fix the solidified soil specimen, ensuring that the solidified soil specimen is located at the center of the flowing salt solution and does not shift in position when being eroded by the complete salt solution fluid flow, minimizing the displacement influence of the scouring force of the salt solution fluid on the solidified soil specimen. The dissolution test device for solidified soil under the erosion environment of flowing salt solution according to the embodiments of the present invention has a simple structure, is convenient and fast for assembly and test operation, has good promotion and application prospects, can be used to study the dissolution effect of salt erosion solution on solidified soil materials in a flowing water environment, and can also be used to study the deformation, strength deterioration and failure mechanism of solidified soil under the coupling action of hydraulic erosion.

[0038] In some embodiments, the cylinder chamber 401 includes an end cap 4011 and a cylinder chamber body 4012; the end cap 4011 is detachably fixed at the end opening of the cylinder chamber body 4012. For example, a threaded connection is adopted between the end cap 4011 and the cylinder chamber body 4012. The cylinder chamber 401 is made of a material with good stiffness and corrosion resistance.

[0039] In some embodiments, the placement rack 402 includes a first ring group 4021, a second ring group 4022, and a support bar group 4023; the first ring group 4021 and the second ring group 4022 are arranged axially spaced from each other and fixed by the support bar group 4023; the first ring group 4021 includes a first outer ring 40211 and a first inner ring 40212 located inside the first outer ring 40211, the second ring group 4022 includes a second outer ring 40221, a second inner ring 40222 located inside the second outer ring 40221, and a fixing ring 40223 located inside the second inner ring 40222. Among them, the first outer ring 4 0211 and the second outer ring 40221 abut and support on the inner peripheral wall of the cylinder chamber 401, the first inner ring 40212 and the second inner ring 40222 are used to fit and place the solidified soil specimen, and the fixing ring 40223 is used to abut against one end face of the solidified soil specimen. When the placement rack 402 is in use, the solidified soil specimen is placed into the placement rack 402 from the first inner ring 40212. The first inner ring 40212 and the second inner ring 40222 prevent the solidified soil specimen from radially shifting, and the fixing ring 40223 abuts against one end face of the solidified soil specimen to prevent the solidified soil specimen from axially shifting. After the solidified soil specimen is placed into the placement rack 402, the first ring group 4021 of the placement rack 402 faces the oncoming flow direction and the placement rack 402 is placed in the cylinder chamber 401. The structure of the placement rack 402 is simple, and the surface of the solidified soil specimen can be exposed to the flowing salt solution as much as possible, without interfering with the erosion effect of the flowing salt solution on the solidified soil specimen. The material of the placement rack 402 can be made of a material with good stiffness and corrosion resistance, without interfering with the erosion effect of the flowing salt solution on the solidified soil specimen.

[0040] In some embodiments, the support bar group 4023 includes a first support bar 40231, a second support bar 40232, a third support bar 40233, an outer support bar 40234, and an inner support bar 40235; the first support bar 40231 is connected between the first outer ring 40211 and the first inner ring 40212, the second support bar 40232 is connected between the second outer ring 40221 and the second inner ring 40222, the third support bar 40233 is connected between the second inner ring 40222 and the fixing ring 40223, the outer support bar 40234 is connected between the first outer ring 40211 and the second outer ring 40221, and the inner support bar 40235 is connected between the first inner ring 40212 and the second inner ring 40222. The structure of the placement rack 402 is simple, without interfering with the erosion effect of the flowing salt solution on the solidified soil specimen.

[0041] In some embodiments, the first support bar 40231, the second support bar 40232, the third support bar 40233, the outer support bar 40234, and the inner support bar 40235 are all straight bars. The first support bar 40231, the second support bar 40232, and the third support bar 40233 all extend radially, and the outer support bar 40234 and the inner support bar 40235 both extend axially. The placement rack has a simple structure, is easy to process and manufacture, and does not interfere with the erosion of the solidified soil specimen by the flowing salt solution.

[0042] In some embodiments, the first outer ring 40211 does not protrude axially from the first inner ring 40212; the second outer ring 40221 protrudes axially from the second inner ring 40222 and the fixing ring 40223. In this way, on the one hand, it can effectively prevent the two ends of the solidified soil specimen from colliding with other objects and being damaged when the solidified soil specimen is placed in the cylinder chamber 401. For example, Figure 3 when multiple placement racks 402 are placed in the cylinder chamber 401, the solidified soil specimens in adjacent placement racks 402 are effectively separated by the adjacent placement racks 402, thereby preventing the solidified soil specimens from colliding and being damaged when placed in the cylinder chamber 401; on the other hand, it is also beneficial for the flowing salt solution to enter the space between adjacent solidified soil specimens, so that the end faces of each solidified soil specimen can also be better in the flowing salt solution erosion environment.

[0043] In some embodiments, there are multiple placement racks 402, and the multiple placement racks 402 are sequentially placed in the hollow cavity of the cylinder chamber 401 along the axial direction of the cylinder chamber 401. Each placement rack 402 contains a solidified soil specimen. In this way, in a single simulation experiment, multiple solidified soil specimens can be subjected to a flowing salt solution erosion test to obtain more erosion data of the solidified soil specimens.

[0044] It should be noted that after placing multiple solidified soil specimens in multiple placement racks 402, the multiple placement racks 402 are placed into the cylinder chamber 401 one by one, ensuring that the solidified soil specimens do not slip during the placement process and keeping the solidified soil specimens always located at the center of the cylinder chamber 401; it is ensured that the end cover 4011 is in good contact with the cylinder chamber body 4012 and there is no liquid leakage.

[0045] In some embodiments, there are multiple control valves 3 and specimen placement chambers 4, and the number of each is the same. The multiple control valves 3 are connected in series with the multiple specimen placement chambers 4 one by one to form multiple control valve - specimen placement chamber series units, and the multiple control valve - specimen placement chamber series units are connected in parallel between the controllable pressure water pump 2 and the salt solution placement pool 1. In this way, the simulation test work of the solidified soil specimen in the flowing salt solution erosion environment can be realized to a greater extent. By independently controlling the erosion time of the solidified soil specimen in each corresponding specimen placement chamber 4 through each control valve 3, the work efficiency can be effectively improved and more accurate and comprehensive erosion data can be obtained.

[0046] In some embodiments, the salt solution placement tank 1 is made of corrosion-resistant material. A switchable solution inlet / outlet 101 is provided at the bottom of the salt solution placement tank 1, facilitating the injection of salt solution into the salt solution placement tank 1 or the discharge of the salt solution in the salt solution placement tank 1. The top of the salt solution placement tank 1 is equipped with a detachable sealing cover 102, which can prevent the salt solution placement tank 1 from being contaminated by foreign objects. At the same time, it is also convenient for the maintenance and cleaning of the salt solution placement tank 1. Before injecting salt solution into the salt solution placement tank 1, it is necessary to check that the salt solution placement tank 1 is sealed and does not leak.

[0047] The present invention also provides a method for using the apparatus for testing the dissolution of solidified soil under the erosion environment of flowing salt solution according to the above embodiments of the present invention.

[0048] The method for using the apparatus for testing the dissolution of solidified soil under the erosion environment of flowing salt solution according to the embodiments of the present invention includes the following steps:

[0049] S1: First, connect the salt solution placement tank 1, the controllable pressure water pump 2, and the control valve 3 with pipelines. Place the solidified soil specimen in the placement rack 402, and place the placement rack 402 with the solidified soil specimen along the axial direction of the cylinder chamber 401 into the hollow cavity of the cylinder chamber 401. Then, connect the two axial ends of the cylinder chamber 401 with the control valve 3 and the salt solution placement tank 1 through pipelines respectively;

[0050] S2: After the installation in step S1 is completed, adjust the controllable pressure water pump 2 to the required pressure, and open the control valve 3 to complete the filling and flowing circulation of the salt solution in the apparatus for testing the dissolution of solidified soil under the erosion environment of flowing salt solution according to the embodiments of the present invention, so as to realize the erosion effect of the flowing salt solution on the solidified soil specimen.

[0051] Thus, the apparatus for testing the dissolution of solidified soil under the erosion environment of flowing salt solution according to the embodiments of the present invention is convenient and fast to assemble and operate in the test. It can realize the dissolution test of solidified soil specimens in the erosion environment of salt solution at different flow rates, reduce the displacement influence of the scouring force of the salt solution fluid on the solidified soil specimens, and can be used to study the dissolution effect of salt erosion solution on solidified soil materials in a flowing water environment, and can also be used to study the deformation, strength deterioration and failure mechanism of solidified soil under the coupling action of water and erosion. It has a simple structure and is convenient to use.

[0052] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc., mean that the specific features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0053] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An erosion test device for solidified soil in a flowing salt solution erosion environment, characterized in that, It includes a salt solution placement pool, a controllable pressure water pump, a control valve, and a specimen placement chamber that are connected end to end in sequence through pipelines; Among them, the salt solution placement pool is used to store salt solution; The controllable pressure water pump is used to make the salt solution in the salt solution placement pool flow through the controllable pressure water pump, the control valve, the specimen placement chamber in sequence, and then return to the salt solution placement pool; the controllable pressure water pump can perform pressurization and pressure maintenance control and adjust the flow rate of the salt solution as needed; The control valve is used to control the entry and exit of salt solution into and out of the specimen placement chamber; The specimen placement chamber includes a cylindrical chamber and a placement rack. One axial end of the cylindrical chamber is the inlet end of the salt solution, and the other axial end of the cylindrical chamber is the outlet end of the salt solution. The placement rack is axially and adaptively placed in the hollow cavity of the cylindrical chamber. The placement rack is used to support and fix the solidified soil specimen so that the solidified soil specimen is located in the middle of the cylindrical chamber, ensuring that the solidified soil specimen is located in the middle of the flowing salt solution.

2. The erosion test device for solidified soil in a flowing salt solution erosion environment according to claim 1, wherein The cylindrical chamber includes an end cover and a cylindrical chamber body; the end cover is detachably fixed at the end opening of the cylindrical chamber body.

3. The erosion test device for solidified soil under the flowing salt solution erosion environment according to claim 2, wherein, The placement rack includes a first ring group, a second ring group, and a support bar group; the first ring group and the second ring group are arranged axially spaced apart from each other and fixed by the support bar group; the first ring group includes a first outer ring and a first inner ring located inside the first outer ring. The second ring group includes a second outer ring, a second inner ring located inside the second outer ring, and a fixing ring located inside the second inner ring. Among them, the first outer ring and the second outer ring abut and support on the inner peripheral wall of the cylindrical chamber. The first inner ring and the second inner ring are used to adaptively place the solidified soil specimen, and the fixing ring is used to abut against one end face of the solidified soil specimen.

4. The erosion test device for solidified soil under the flowing salt solution erosion environment according to claim 3, wherein The support bar group includes a first support bar, a second support bar, a third support bar, an outer support bar, and an inner support bar; the first support bar is connected between the first outer ring and the first inner ring, the second support bar is connected between the second outer ring and the second inner ring, the third support bar is connected between the second inner ring and the fixing ring, the outer support bar is connected between the first outer ring and the second outer ring, and the inner support bar is connected between the first inner ring and the second inner ring.

5. The erosion test device for solidified soil under the flowing salt solution erosion environment according to claim 4, characterized in that, The first support bar, the second support bar, the third support bar, the outer support bar, and the inner support bar are all straight bars.

6. The erosion test device for solidified soil under the flowing salt solution erosion environment according to claim 4, wherein The first outer ring does not protrude axially from the first inner ring; the second outer ring protrudes axially from the second inner ring and the fixing ring.

7. The erosion test device for solidified soil under the flowing salt solution erosion environment according to any one of claims 1-6, characterized in that, There are multiple placement racks, and the multiple placement racks are sequentially placed in the hollow cavity of the cylindrical chamber along the axial direction of the cylindrical chamber.

8. The erosion test device for solidified soil under the flowing salt solution erosion environment according to any one of claims 1-6, characterized in that, There are multiple control valves and specimen placement chambers, and the number is the same. The multiple control valves are in one-to-one correspondence and series connection with the multiple specimen placement chambers to form multiple control valve-specimen placement chamber series units. The multiple control valve-specimen placement chamber series units are connected in parallel between the controllable pressure water pump and the salt solution placement pool.

9. The erosion test device for solidified soil under the flowing salt solution erosion environment according to any one of claims 1-6, characterized in that, The salt solution placement pool is made of corrosion-resistant materials, and a switchable solution inlet and outlet is provided at the bottom of the salt solution placement pool.

10. A method for using the erosion test device for solidified soil under the flowing salt solution erosion environment according to any one of claims 1 to 9, characterized in that, The steps are as follows: S1: First, connect the salt solution placement tank, the controllable pressure water pump, and the control valve with pipelines. Place the solidified soil specimen in the placement rack, and place the placement rack with the solidified soil specimen along the axial direction of the cylinder chamber into the hollow cavity of the cylinder chamber. Then, connect the two axial ends of the cylinder chamber to the control valve and the salt solution placement tank respectively through pipelines; S2: After the installation in step S1 is completed, adjust the controllable pressure water pump to the required pressure, and open the control valve to complete the filling and flowing circulation of the salt solution in the solidified soil dissolution test device under the flowing salt solution erosion environment, so as to realize the erosion effect of the flowing salt solution on the solidified soil specimen.

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