A mudstone dry-wet cycle test device based on microwave heating

Abstract

The utility model discloses a kind of mudstone dry-wet cycle test devices based on microwave heating, it is related to technical field, comprising: test box, for containing to-be-measured mudstone sample;Microwave heating assembly, the top of test box is set, for heating mudstone sample;Water circulation assembly, for the wetting or simulating groundwater level change of mudstone sample;Movable support assembly, for supporting and realizing the displacement of microwave heating assembly or water circulation assembly;Detection assembly, for collecting the physical parameter of mudstone sample in dry-wet cycle process, it has the advantages that mudstone is heated efficiently and uniformly, environmental simulation is realistic, operation is flexible and detection is accurate.

Description

Technical Field

[0001] This utility model belongs to the field of geotechnical engineering testing technology, and more specifically it relates to a mudstone dry-wet cycle test device based on microwave heating. Background Technology

[0002] Mudstone is a typical soft rock, mainly composed of clay minerals. It is extremely sensitive to water, easily softening and disintegrating upon contact with water, leading to reduced strength and structural damage. In engineering construction, the mechanical properties of mudstone strata vary significantly with water content, making them prone to deformation and slippage. Therefore, studying the deterioration patterns of mudstone under wet-dry cycles is of great significance.

[0003] However, existing wet-dry cycle testing devices suffer from problems such as low heating efficiency, uneven temperature distribution, and long cycle times. Especially when dealing with mudstone containing a high clay content, traditional heating methods struggle to achieve uniform evaporation of internal moisture, leading to uneven drying and wetting of the sample and thus affecting the accuracy and repeatability of the test results.

[0004] In recent years, microwave heating technology has been introduced into the fields of soil treatment and foundation reinforcement. Microwave heating has the characteristics of strong penetration, uniform heating, and rapid temperature rise, enabling rapid dehydration and solidification of soil and rock masses in a short time. However, there is currently a lack of specialized equipment and methods for the application of microwave heating in mudstone wet-dry cycle tests. Existing research is mostly focused on foundation reinforcement and has not yet developed a systematic testing equipment suitable for laboratory conditions.

[0005] Therefore, there is an urgent need to provide a microwave-heated mudstone wet-dry cycle test device to solve the above problems. Utility Model Content

[0006] To address the shortcomings of existing technologies, the purpose of this invention is to provide a microwave-heated mudstone wet-dry cycle test device, which has the advantages of efficient and uniform heating of mudstone, realistic environmental simulation, flexible operation, and accurate detection.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A microwave-heated mudstone wet-dry cycle test device includes: a test chamber for holding the mudstone sample to be tested;

[0009] The microwave heating component, located at the top of the test chamber, is used to heat the mudstone sample; the water circulation component is used to wet the mudstone sample or simulate groundwater level changes; the movable support component is used to support and allow displacement of the microwave heating component or the water circulation component; and the detection component is used to collect the physical parameters of the mudstone sample during the wet-dry cycle.

[0010] The advantages of this scheme are at least as follows: by using a microwave heating component, the mudstone sample can be heated and dried quickly, efficiently and uniformly, which greatly shortens the drying cycle and improves the test efficiency; at the same time, combined with a water circulation component, it can flexibly and accurately simulate groundwater level changes or surface wetting processes, realize the automation and precise control of the wet-dry cycle test, and overcome the limitations of artificial wetting or simple soaking.

[0011] Meanwhile, the movable support components allow for the movement of the microwave heating components and the water circulation components, improving the ease of operation of the experimental device. In addition, the measuring components can collect key physical parameters such as internal strain, surface settlement, and water level changes of mudstone in real time and comprehensively during the wet-dry cycle, thereby more realistically and accurately demonstrating the specific situation of mudstone under environmental changes and providing more reliable experimental data.

[0012] The present invention is further configured such that: the microwave heating assembly includes: a microwave generator and a waveguide connected thereto, the waveguide having multiple holes, one end of the waveguide extending into the test chamber, and the microwave generator being detachably and slidably mounted on the movable support assembly.

[0013] The advantages of this scheme are at least as follows: By extending one end of the waveguide into the test chamber, specifically during the test, the microwave heating component is moved to a suitable position via a movable support assembly, and then the waveguide is buried in the mudstone. When heating the mudstone, the porous waveguide creates a more uniform microwave field within the test chamber, ensuring uniform heating of the mudstone sample as a whole, effectively avoiding the generation of local "hot spots," and improving the uniformity and safety of heating. At the same time, the microwave generator can be detached and slidably mounted on the movable support assembly, which greatly facilitates the installation, removal, and maintenance of the microwave generator, and allows it to be quickly switched with other components, ensuring the continuity and flexibility of the test process.

[0014] The present invention is further configured such that the water circulation component includes: a liquid collection chamber, a water inlet, and a drain outlet;

[0015] The test chamber is symmetrically provided with first permeable plates on both sides, and a second permeable plate is provided at the bottom of the two first permeable plates;

[0016] The first permeable plate, the second permeable plate, together with the two side walls and the bottom surface of the test chamber, form the liquid collection cavity. The water inlet is located on one side of the test chamber and communicates with the liquid collection cavity.

[0017] The drain outlet is located at the bottom of the test chamber and is connected to the liquid collection chamber.

[0018] The advantages of this scheme are at least as follows: Addressing the shortcomings of traditional wetting methods, which often only achieve simple soaking and cannot accurately simulate changes in the natural groundwater level, this scheme incorporates a collection chamber, an injection port, and an outlet. By cleverly utilizing a first permeable plate symmetrically placed on both sides of the test chamber and a second permeable plate at the bottom to form the collection chamber, water can permeate evenly through the permeable plates, achieving comprehensive and uniform wetting of the mudstone sample from both sides and bottom, eliminating the effects of uneven wetting. More importantly, the coordination of the injection and outlets allows for precise control of the water level height and rate of change within the collection chamber, thereby accurately simulating the rise, stabilization, and fall of the groundwater level, making the wet-dry cycle test conditions closer to actual engineering conditions.

[0019] The present invention is further configured such that: the water circulation component also includes a detachable water tank, the water tank being slidably mounted on the movable support component for simulating the rainfall infiltration process, and the bottom of the water tank is provided with a drain hole.

[0020] The advantages of this scheme are at least as follows: by adding a detachable water tank, which is slidably mounted on a movable support assembly and has drainage holes at the bottom, the experimenters can precisely control the rainfall and infiltration rate through the water tank, thereby simulating the wetting and impact of surface water (such as rainfall) on the mudstone surface, further expanding the function and environmental simulation capabilities of the experimental device; at the same time, the detachable and sliding installation design of the water tank ensures that the water tank can be quickly and seamlessly switched with the microwave heating assembly without affecting the continuity of the experimental process.

[0021] The present invention is further configured such that: the movable support component includes a longitudinal guide rail and a transverse guide rail, the transverse guide rail is slidably mounted on the longitudinal guide rail by two support frames, and the transverse guide rail is provided with a plurality of detachable sliders, the sliders being movable along the transverse guide rail for supporting and adjusting the position of the microwave heating component or the water tank.

[0022] The advantages of this scheme are at least as follows: the transverse guide rail is slidably mounted on the longitudinal guide rail by a support frame, and the position of the microwave heating component or water tank is adjusted by a detachable slider, thereby forming a stable two-dimensional moving platform. This not only accurately supports and positions the microwave heating component and water tank, ensuring that they can be accurately aligned with the test chamber for operation, but also enables rapid, smooth, and interference-free switching between different working components through the quick adjustment function of the slider, greatly improving the efficiency, accuracy, and automation of the test operation.

[0023] The present invention is further configured such that the detection component includes a strain sensor, a displacement sensor, and a liquid level sensor.

[0024] The advantages of this scheme are at least as follows: by setting up detection components, multi-dimensional monitoring of mudstone samples can be achieved throughout the entire wet-dry cycle. Among them, strain sensors can collect information on minute deformations and crack propagation within the mudstone in real time; displacement sensors can measure the overall settlement changes of the sample surface; and liquid level sensors can monitor changes in the water level elevation in the test chamber.

[0025] The present invention is further configured such that: one end of the strain sensor is fixedly mounted on the movable support assembly, and the other end is embedded inside the mudstone sample, for detecting the internal strain change of the mudstone during the wet-dry cycle.

[0026] The advantages of this scheme are at least as follows: one end of the strain sensor is fixed to a movable support assembly, and the other end is directly embedded inside the mudstone sample, which can simultaneously monitor the strain change process at different depths; this internal deployment method can better reflect the true stress and strain state inside the material compared with external measurement, and avoids the influence of surface constraints or external disturbances, thereby improving the measurement accuracy and the accuracy of experimental data.

[0027] The present invention is further configured such that: the displacement sensor is fixedly mounted on the movable support assembly, and the displacement sensor falls freely to the mudstone surface by its own gravity, for detecting the amount of settlement on the mudstone surface.

[0028] The advantages of this scheme are at least as follows: the displacement sensor relies on its own weight to fall freely onto the mudstone surface for displacement detection, which enables dynamic monitoring of surface settlement without additional loading force, avoids local compaction errors caused by additional contact force, reduces disturbance to the mudstone sample during the measurement process, and enables accurate and real-time detection of the mudstone surface settlement, thereby effectively reflecting the settlement changes of the mudstone.

[0029] The present invention is further configured such that: the liquid level sensor is installed on the inner wall of the test chamber for real-time detection of the simulated groundwater level.

[0030] The advantages of this scheme are at least as follows: by placing the liquid level sensor on the inner wall of the test chamber, it is possible to monitor and accurately monitor the changes in the water level in the collection chamber in real time without occupying test space, thereby providing timely feedback to the test personnel for precise control of the water injection and drainage process.

[0031] The present invention is further configured such that at least one side of the test chamber is transparent.

[0032] The advantages of this scheme are at least as follows: by making at least one side of the test chamber transparent, this design not only allows the test personnel to directly and clearly observe the macroscopic physical changes on the surface of the mudstone sample with the naked eye, but also facilitates recording and taking pictures, thereby achieving an effective combination of qualitative observation and quantitative monitoring data.

[0033] In summary, this utility model has at least the following advantages:

[0034] 1. By setting up a microwave heating component, including a microwave generator and a waveguide connected to it, the waveguide has multiple holes, which allows the microwave energy to be evenly distributed to the mudstone sample in the test chamber during heating, thereby avoiding the local overheating phenomenon caused by traditional heating methods; at the same time, the microwave generator can be detached and slidably installed on a movable support component, which not only facilitates maintenance and adjustment, but also improves the flexibility and practicality of the equipment.

[0035] 2. By setting up a water circulation component including a liquid collection chamber, a water inlet, a water outlet, and a detachable water tank with a drainage hole at the bottom, the experimental device can effectively simulate the changes in the mudstone environment under different water level conditions. In particular, by simulating the rainfall infiltration process, the realism and diversity of the experiment are enhanced, and the accuracy and reliability of the experimental data are improved.

[0036] 3. By setting up detection components including strain sensors, displacement sensors and liquid level sensors, and designing a transparent test chamber with at least one side, not only can real-time monitoring of internal strain changes, surface settlement and groundwater level of mudstone samples be realized, but also various phenomena during the experiment can be easily observed, greatly improving the convenience of experimental operation and the intuitiveness of observation.

[0037] 4. The transverse guide rail is slidably mounted on the longitudinal guide rail using a support frame, and the position of the microwave heating component or water tank is adjusted using a detachable slider, thus forming a stable two-dimensional moving platform. This not only accurately supports and positions the microwave heating component and water tank, ensuring that they can be accurately aligned with the test chamber for operation, but also enables rapid, smooth, and interference-free switching between different working components through the quick adjustment function of the slider, greatly improving the efficiency, accuracy, and automation of the test operation. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the overall implementation of this embodiment.

[0039] Reference numerals: 1. Test chamber; 2. Microwave heating assembly; 201. Microwave generator; 202. Waveguide; 3. Water circulation assembly; 301. Liquid collection chamber; 302. Water inlet; 303. Drain outlet; 304. Water tank; 4. Movable support assembly; 401. Longitudinal guide rail; 402. Transverse guide rail; 403. Support frame; 404. Slider; 5. Detection assembly; 501. Strain sensor; 502. Displacement sensor; 503. Liquid level sensor; 6. First permeable plate; 7. Second permeable plate. Detailed Implementation

[0040] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, where there is no conflict, the embodiments of this utility model and the features within them can be combined with each other.

[0041] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0042] Example 1

[0043] like Figure 1 As shown, a mudstone wet-dry cycle test device based on microwave heating includes: a test chamber 1, used to hold the mudstone sample to be tested. Specifically, during the experiment, the mudstone needs to be filled and compacted in the test chamber 1.

[0044] The microwave heating component 2 is located on the top of the test chamber 1 and is used to heat the mudstone sample; the water circulation component 3 is used to wet the mudstone sample or simulate groundwater level changes; the movable support component 4 is used to support and realize the displacement of the microwave heating component 2 or the water circulation component 3; and the detection component 5 is used to collect the physical parameters of the mudstone sample during the wet-dry cycle.

[0045] To facilitate direct observation of the specific changes in the mudstone inside the test chamber 1, and for recording and photographing, in some preferred embodiments, at least one side of the test chamber 1 is made transparent. The transparent side of the test chamber 1 can be made of high-strength heat-resistant glass or transparent resin. In other embodiments, to prevent moisture leakage, a sealing ring or high-temperature resistant sealant is added between the high-strength heat-resistant glass or transparent resin and the test chamber 1.

[0046] By using microwave heating component 2, the mudstone sample can be rapidly, efficiently and uniformly heated and dried internally, which greatly shortens the drying cycle and improves the test efficiency. At the same time, combined with water circulation component 3, it can flexibly and accurately simulate groundwater level changes or surface wetting process, realize the automation and precise control of dry and wet cycle test, and overcome the limitations of artificial wetting or simple soaking.

[0047] Meanwhile, the movable support component 4 enables the movement of the microwave heating component 2 and the water circulation component 3, improving the ease of operation of the experimental device. In addition, the measuring components can collect key physical parameters such as internal strain, surface settlement and water level changes of mudstone in real time and comprehensively during the wet-dry cycle, thereby more realistically and accurately showing the specific situation of mudstone under environmental changes and providing more reliable experimental data.

[0048] Example 2

[0049] like Figure 1 As shown, the microwave heating assembly 2 includes a microwave generator 201 and a waveguide 202 connected thereto. The waveguide 202 has multiple holes, and one end of the waveguide 202 extends into the test chamber 1. The microwave generator 201 is detachably and slidably mounted on the movable support assembly 4. Specifically, during the test, the microwave heating assembly 2 is moved to a suitable position using the movable support assembly 4, and then the waveguide 202 is buried in the mudstone. When heating the mudstone, the perforated waveguide 202 creates a more uniform microwave field within the test chamber 1, ensuring uniform heating of the mudstone sample and effectively avoiding the generation of local "hot spots," thus improving the uniformity and safety of heating.

[0050] The movable support assembly 4 includes a longitudinal guide rail 401 and a transverse guide rail 402. The transverse guide rail 402 is slidably mounted on the longitudinal guide rail 401 via two support frames 403. The transverse guide rail 402 is provided with several detachable sliders 404, which can move along the transverse guide rail 402 to support and adjust the position of the microwave heating assembly 2 or the water tank 304. Notably, the microwave generator 201 is detachably and slidably mounted on the movable support assembly 4, which greatly facilitates the installation, removal, and maintenance of the microwave generator 201, and allows it to be quickly switched in position with other components, ensuring the continuity and flexibility of the experimental process.

[0051] In some preferred embodiments, the bottom of the microwave generator 201 and the slider 404 are provided with a sliding groove structure that matches the transverse guide rail 402. The microwave generator 201 can be slidably connected to the transverse guide rail 402 through the groove and fixed in a designated position by a limiting bolt or locking member.

[0052] In some other embodiments, the microwave generator 201 is installed with an inverted structure, that is, the slot at its bottom is in the shape of an inverted U, which can be inserted into the horizontal slide rail from above and fixed in a designated position by limiting bolts or locking parts; in other more preferred embodiments, the movable support assembly 4 includes two parallel horizontal guide rails 402, and the bottom of the microwave generator 201 and the slider 404 are provided with two sets of corresponding slide grooves, which achieve more stable sliding and positioning through double rail guidance;

[0053] In some preferred embodiments, to improve ease of assembly and disassembly, limit blocks and quick-locking mechanisms can be provided at both ends of the transverse slide rail. When installing the microwave generator 201 and slider 404, they simply slide in along the slide rail direction and are secured by the quick-locking mechanism to complete positioning; when disassembling, the lock is released and they slide in the opposite direction to quickly detach from the transverse guide rail 402. The quick-locking mechanism may have a limit hole at the top of the slide rail, with corresponding limit holes on the microwave generator 201 and slider 404. When slid to the designated position, a positioning pin or a rotary pin is inserted into the limit hole to lock the mechanism. The positioning pin can then be removed for disassembly.

[0054] Example 3

[0055] like Figure 1 As shown, the water circulation component 3 includes: a liquid collection chamber 301, a water inlet 302, and a drain outlet 303; the test chamber 1 is symmetrically provided with first permeable plates 6 on both sides, and a second permeable plate 7 is provided at the bottom of the first permeable plates 6; the first permeable plates 6, the second permeable plates 7, together with the side walls and bottom surface of the test chamber 1, form the liquid collection chamber 301, so that water flows through the first permeable plates 6 and the second permeable plates 7 to permeate evenly, achieving all-round and uniform wetting of the mudstone sample from the sides and bottom, eliminating the influence of uneven wetting; the water inlet 302... 2. The water inlet 302 is located on one side of the test chamber 1 and is connected to the liquid collection chamber 301; the drain outlet 303 is located at the bottom of the test chamber 1 and is connected to the liquid collection chamber 301. Through the cooperation of the water inlet 302 and the drain outlet 303, the water level height and change rate in the liquid collection chamber 301 can be precisely controlled, thereby simulating the rise, stabilization and fall of the groundwater level with high precision. This makes the dry and wet cycle test conditions closer to the actual engineering situation and solves the problem that traditional wetting methods can only achieve simple soaking and cannot accurately simulate the changes in the groundwater level in nature.

[0056] Furthermore, the water circulation component 3 also includes a detachable water tank 304, which is slidably mounted on the movable support component 4 to simulate the rainfall infiltration process. The water tank 304 has a drainage hole at its bottom. The water tank 304 and the drainage hole allow the experimenter to precisely control the rainfall and infiltration rate through the water tank 304, thereby simulating the wetting and impact of surface water (such as rain) on the mudstone surface, further expanding the functionality and environmental simulation capabilities of the experimental device. At the same time, the detachable and sliding installation design of the water tank 304 ensures that the water tank 304 can be quickly and seamlessly switched with the microwave heating component 2 without affecting the continuity of the experimental process.

[0057] In some preferred embodiments, a pressurization device can be added to the water tank 304 to provide a stable and adjustable water pressure to the test chamber 1 during the test, so as to more realistically simulate natural conditions such as changes in groundwater level or rainwater infiltration. The pressurization device may specifically include a miniature water pump, a pressure sensor, and a pressure regulating valve. The miniature water pump is used to deliver water into the test chamber 1, the pressure sensor is used to monitor water pressure changes in real time, and the pressure regulating valve is used to control the water flow rate and pressure to achieve wetting or soaking control at different stages.

[0058] Example 4

[0059] like Figure 1 As shown, the detection component 5 includes a strain sensor 501, a displacement sensor 502, and a liquid level sensor 503.

[0060] The strain sensor 501 has one end fixed to the movable support assembly 4 and the other end embedded inside the mudstone sample, used to detect the internal strain changes of the mudstone during wet-dry cycles. The displacement sensor 502 is fixed to the movable support assembly 4 and falls freely to the mudstone surface under its own weight, used to detect the settlement of the mudstone surface. The liquid level sensor 503 is installed on the inner wall of the test chamber 1, used to detect the height of the simulated groundwater level in real time.

[0061] In a preferred embodiment, the test apparatus further includes a control system, which preferably includes a central controller (such as a PLC or a high-performance microcontroller), a human-machine interface (such as a touch screen), a power supply module, and a data acquisition module.

[0062] The control system is connected to the microwave heating component 2 via a power module to control the on / off time and output power of the microwave generator 201; while the central controller microwaves the mudstone according to a preset cycle program to ensure the accuracy of the drying process.

[0063] Specifically, the control system is electrically connected to the electric valves (such as solenoid valves or electric ball valves) installed at the water inlet 302 and the drain outlet 303 to precisely control the opening and closing time of the valves or the operation of the water inlet and drain pumps. Combined with the real-time water level data fed back by the liquid level sensor 503, it realizes closed-loop control of the water level height and change rate in the liquid collection chamber 301, and accurately simulates the rising, stabilizing and falling process of the groundwater level.

[0064] Connection to detection component 5: The control system is electrically connected to strain sensor 501, displacement sensor 502, and liquid level sensor 503 respectively via a data acquisition module. The data acquisition module acquires analog or digital signals from each sensor in real time, processes and stores them in internal memory, or transmits them to an external computer (not shown), thereby ensuring synchronous and continuous monitoring of various physical parameters of the mudstone sample during the wet-dry cycle.

[0065] The specific working process and beneficial effects of this utility model are as follows:

[0066] Before the test, the pretreated mudstone sample was filled into test chamber 1 and compacted according to the test requirements to form a dense structure similar to the actual foundation conditions. During the backfilling process, several strain sensors 501 were installed at different depths or positions to monitor the strain changes of the sample in real time during the heating and wetting process.

[0067] Subsequently, microwave heating assembly 2 is installed, microwave generator 201 is fixed on movable support assembly 4, and waveguide 202 is inserted into test chamber 1, burying the waveguide 202 within the mudstone to ensure uniform distribution of microwave energy within the sample area. Depending on experimental requirements, several displacement sensors 502 can be installed inside and outside test chamber 1 to measure the settlement of the mudstone surface during heating and wetting cycles.

[0068] Next, the microwave heating component 2 is activated through the control system. The microwaves generated by the microwave generator 201 are transmitted to the interior of the test chamber 1 through the waveguide 202 to rapidly heat the mudstone sample, causing the internal moisture to evaporate and the porosity to decrease, thereby achieving the reinforcement and drying process. During this period, the detection component 5 monitors the strain changes inside the mudstone and the settlement on the surface of the mudstone.

[0069] Finally, according to the test requirements, the water circulation system was activated, and the pressurization equipment was controlled to inject water into test chamber 1 to simulate rainfall or rising groundwater levels, thereby realizing the rewetting process of the mudstone. By adjusting the water pressure and volume, the infiltration and wetting states under different water environments can be flexibly simulated.

[0070] By alternating between the drying and wetting stages, a complete dry-wet cycle test process can be formed. This test device can achieve efficient and uniform heating of mudstone, realistic environmental simulation, flexible operation, and accurate detection, solving the problems of uneven heating, difficulty in simulating groundwater level changes, and low detection accuracy in traditional mudstone dry-wet cycle tests.

[0071] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0072] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A microwave-heated mudstone wet-dry cycle test device, characterized in that, include: Test chamber (1) is used to hold mudstone samples to be tested; Microwave heating assembly (2) is set on top of test chamber (1) for heating mudstone samples; Water circulation component (3) is used to wet mudstone samples or simulate changes in groundwater level; A movable support assembly (4) is used to support and realize the displacement of the microwave heating assembly (2) or the water circulation assembly (3); The detection component (5) is used to collect the physical parameters of the mudstone sample during the wet-dry cycle.

2. The mudstone wet-dry cycle test device according to claim 1, characterized in that: The microwave heating assembly (2) includes a microwave generator (201) and a waveguide (202) connected thereto. The waveguide (202) has multiple holes. One end of the waveguide (202) extends into the test chamber (1). The microwave generator (201) is detachably and slidably mounted on the movable support assembly (4).

3. The mudstone wet-dry cycle test device according to claim 1, characterized in that: The water circulation component (3) includes: a liquid collection chamber (301), a water inlet (302), and a drain outlet (303). The test chamber (1) is symmetrically provided with first permeable plates (6) on both sides, and a second permeable plate (7) is provided at the bottom of the two first permeable plates (6). The first permeable plate (6), the second permeable plate (7), and the two side walls and bottom surface of the test chamber (1) together form the liquid collection cavity (301). The water inlet (302) is located on one side of the test chamber (1) and communicates with the liquid collection cavity (301). The drain outlet (303) is located at the bottom of the test chamber (1) and is connected to the liquid collection chamber (301).

4. The mudstone wet-dry cycle test device according to claim 1, characterized in that: The water circulation component (3) also includes a detachable water tank (304), which is slidably mounted on the movable support component (4) to simulate the rain infiltration process. The bottom of the water tank (304) is provided with a drain hole.

5. The mudstone wet-dry cycle test device according to claim 4, characterized in that: The movable support assembly (4) includes a longitudinal guide rail (401) and a transverse guide rail (402). The transverse guide rail (402) is slidably mounted on the longitudinal guide rail (401) via two support frames (403). The transverse guide rail (402) is provided with several detachable sliders (404). The sliders (404) can move along the transverse guide rail (402) to support and adjust the position of the microwave heating assembly (2) or the water tank (304).

6. The mudstone wet-dry cycle test device according to claim 1, characterized in that: The detection component (5) includes a strain sensor (501), a displacement sensor (502), and a liquid level sensor (503).

7. The mudstone wet-dry cycle test device according to claim 6, characterized in that: One end of the strain sensor (501) is fixed on the movable support assembly (4), and the other end is embedded inside the mudstone sample to detect the internal strain change of the mudstone during the wet-dry cycle.

8. The mudstone wet-dry cycle test device according to claim 6, characterized in that: The displacement sensor (502) is fixed on the movable support assembly (4). The displacement sensor (502) falls freely to the mudstone surface by its own gravity and is used to detect the amount of settlement on the mudstone surface.

9. The mudstone wet-dry cycle test device according to claim 6, characterized in that: The liquid level sensor (503) is installed on the inner wall of the test chamber (1) to detect the height of the simulated groundwater level in real time.

10. The mudstone wet-dry cycle test device according to claim 1, characterized in that: The test chamber (1) has at least one side that is transparent.

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