Gaseous water migration quality testing system, method, terminal and computer-readable storage medium

Abstract

This invention discloses a gaseous water migration mass testing system, method, terminal, and computer-readable storage medium, relating to the fields of civil engineering, geotechnical engineering, and geological engineering. The system includes a sample chamber, a heating device, a mass measuring device, and a control system. The sample chamber contains the soil sample to be tested, and the heating device heats the soil sample. The mass measuring device includes a rigid connecting plate, a moisture-absorbing layer, and a weighing device. The rigid connecting plate covers the top of the sample chamber, and the moisture-absorbing layer is located below the rigid connecting plate to absorb migrating gaseous water within the soil sample. The weighing device is connected to the rigid connecting plate and measures the weight change of the moisture-absorbing layer. The control system is signal-connected to the weighing device and the heating device. The gaseous water migration mass testing method of this invention is implemented using the above system, and both the terminal and the computer-readable storage medium store computer programs implementing the method. This invention enables real-time measurement of gaseous water migration mass.

Description

Technical Field

[0001] This invention relates to the fields of civil engineering and geotechnical and geological engineering, and in particular to a gaseous water migration quality testing system, method, terminal, and computer-readable storage medium. Background Technology

[0002] Temperature changes leading to moisture migration in unsaturated soil are a major cause of engineering problems such as roadbed subsidence, frost heave, and structural settlement and tilting. Moisture migration in unsaturated soil can be mainly divided into two types: liquid water migration and gaseous water migration. At higher moisture contents, liquid water migration predominates, while at lower moisture contents, gaseous water migration predominates.

[0003] Currently, domestic and international research on water migration in unsaturated soil mainly focuses on liquid water. For research on gaseous water migration, the usual method is to dig holes at the corresponding locations in the soil after the experiment to collect soil samples, and then use the drying method to test the moisture content. This method involves a large number of experiments, is time-consuming, causes significant disturbance to the soil, and makes it difficult to obtain real-time migration data.

[0004] Therefore, there is an urgent need to provide a method for testing the migration quality of gaseous water to solve the above-mentioned problems in the existing technology. Summary of the Invention

[0005] The purpose of this invention is to provide a gaseous water migration quality testing system, method, terminal, and computer-readable storage medium to solve the problems existing in the prior art and to realize real-time measurement of gaseous water migration quality.

[0006] To achieve the above objectives, the present invention provides the following solution:

[0007] This invention provides a gaseous water migration quality testing system, comprising:

[0008] A sample chamber, wherein the sample chamber is used to place the soil to be tested;

[0009] A heating device is used to heat the soil to be tested in the sample chamber;

[0010] A mass measuring device, comprising a rigid connecting plate, a moisture-absorbing layer, and a weighing device, wherein the rigid connecting plate covers the top of the sample chamber, the moisture-absorbing layer is disposed below the rigid connecting plate and is used to adsorb gaseous water that migrates inside the soil to be tested, and the weighing device is connected to the rigid connecting plate and is used to measure the weight change of the moisture-absorbing layer.

[0011] The control system is signal-connected to the weighing device and the heating device.

[0012] Preferably, it further includes a thermal insulation cover, which is installed on the outside of the sample chamber, with the bottom of the thermal insulation cover fixed to the base plate and the top covered with an upper cover; wherein, the sample chamber is a cylindrical structure with openings at the top and bottom, the heating device is installed on the base plate and located at the bottom of the sample chamber, and the rigid connecting plate and the moisture-absorbing layer are installed inside the thermal insulation cover and located above the sample chamber.

[0013] Preferably, the heating device includes a heating plate, a temperature probe, and a temperature controller. The heating plate is disposed on the base plate and covers the bottom opening of the sample chamber. The temperature probe is disposed on the upper part of the heating plate and is used to monitor the actual temperature of the heating plate. The temperature probe is connected to a data acquisition instrument, which is connected to the control system. The data acquisition instrument is used to collect the temperature data monitored by the temperature probe and transmit the temperature data to the control system. The temperature controller is connected to the heating plate via a power cord and is also connected to the control system. The control system regulates the output power of the heating plate through the temperature controller.

[0014] The control system controls the output power of the heating plate using a PID control algorithm.

[0015] Preferably, it also includes a support frame, the weighing device is mounted on the support frame and located above the heat insulation cover; a screw is connected to the top of the rigid connecting plate, and a shaft hole is provided on the upper cover for the screw to pass through, the top end of the screw passes upward through the shaft hole and is connected to the bottom of the weighing device through a hook;

[0016] The weighing device is a tension / compression sensor.

[0017] Preferably, it also includes a temperature and humidity sensor, the probe of which can be inserted into the soil to be tested to monitor the temperature and humidity of the soil. The temperature and humidity sensor is connected to a data acquisition instrument, which is connected to the control system. The data acquisition instrument is used to collect the temperature and humidity data monitored by the temperature and humidity sensor and transmit it to the control system.

[0018] The sample chamber and the thermal insulation cover are provided with corresponding sensor ports for the temperature and humidity sensor to be inserted. The gap between the temperature and humidity sensor and the side wall of the sample chamber and the side wall of the thermal insulation cover is filled with a sealing material, which is a thermal insulation material.

[0019] The present invention also provides a method for testing the quality of gaseous water migration, implemented using the gaseous water migration quality testing system described above, comprising the following steps:

[0020] S1. The soil to be tested is loaded into the sample chamber;

[0021] S2. Conduct a moisture evaporation test on the soil to be tested. The soil to be tested is heated by the heating device. The moisture-absorbing layer adsorbs the gaseous water that migrates inside the soil to be tested. The weight change of the moisture-absorbing layer is measured by the weighing device.

[0022] S3. The weight of the moisture-absorbing layer changes over time through the control system to measure the mass of gaseous water migration in real time.

[0023] Preferably, before step S1, the method further includes the following step:

[0024] S101. Prepare a soil sample with a predetermined moisture content and let it stand; fill the soil sample into the test chamber in multiple batches to obtain the soil to be tested; wherein, after each layer of soil sample is filled, the surface is roughened after interlayer compaction, and then the upper layer of soil sample is filled.

[0025] S102. Assemble the heating device and the mass measuring device.

[0026] Preferably, in step S2, the control system acquires the temperature and humidity of the soil to be tested and adjusts the output power of the heating device to maintain a stable temperature in the sample chamber.

[0027] Simultaneously, the insulation effect of the test chamber is tested, and a temperature distribution model of the soil to be tested is established. Using the geometry, boundary values, and heat transfer parameters of the soil to be tested as input, the temperature distribution of the soil to be tested is simulated and calculated. Then, the simulated temperature of the soil to be tested is determined based on the simulation results. The difference between the currently obtained temperature and the simulated temperature is compared. When the difference is less than 5%, it is determined that the insulation effect of the test chamber meets the requirements. Otherwise, it is determined that the insulation effect of the test chamber does not meet the requirements, the test is stopped, and the insulation effect of the test chamber is improved.

[0028] In step S4, the control system plots a curve showing the change in the mass of gaseous water migration over time based on the change in the weight of the moisture-absorbing layer over time.

[0029] The present invention also provides a terminal, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the gaseous water migration quality testing method as described above.

[0030] The present invention also provides a computer-readable storage medium storing a computer program, which, when executed, implements the gaseous water migration quality testing method as described above.

[0031] The present invention achieves the following technical effects compared to the prior art:

[0032] In this invention, soil samples with different moisture contents and densities are placed in a sample chamber. The soil samples are heated by a heating device, which causes the gaseous water inside the soil samples to migrate. The migrating gaseous water is absorbed by a hygroscopic layer. The mass of gaseous water migration can be obtained by measuring the weight change of the hygroscopic layer using a weighing device. The mass of gaseous water migration can be obtained by acquiring the weight change of the hygroscopic layer over time through a control system. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the structure of the gaseous water migration quality testing system in an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of the heating device in an embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram showing the connection between the temperature and humidity sensor and the data acquisition instrument in an embodiment of the present invention;

[0037] Figure 4 This is a flowchart illustrating the process of the gaseous water migration quality testing method in an embodiment of the present invention.

[0038] In the diagram: 1-Top cover; 2-Rigid connecting plate; 3-Moisture-absorbing layer; 4-Soil to be tested; 5-Insulation cover; 6-Heating plate; 7-Fixing bolt; 8-Base plate; 9-Sensor socket; 10-Tension / compression sensor; 11-Vertical support rod; 12-Horizontal support rod; 13-Sample chamber; 14-Snap fastener; 15-Screw; 16-Hook; 17-First sealing ring; 18-Second sealing ring; 19-Cross clamp; 20-Temperature probe; 21-Temperature controller; 22-Temperature and humidity sensor; 23-Data acquisition instrument. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] The purpose of this invention is to provide a gaseous water migration quality testing system, method, terminal, and computer-readable storage medium to solve the problems existing in the prior art, and to achieve real-time measurement of gaseous water migration quality while ensuring the undisturbed soil sample.

[0041] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] Example 1

[0043] like Figures 1-4 As shown, this embodiment provides a gaseous water migration mass testing system, mainly including a sample chamber 13, a heating device, a mass measuring device, and a control system; wherein, the sample chamber 13 is used to place the soil sample 4 to be tested, and the soil sample 4 can be selected from soil samples with different moisture contents and densities; the heating device is used to heat the soil sample 4 in the sample chamber 13; the mass measuring device includes a rigid connecting plate 2, a moisture-absorbing layer 3, and a weighing device, the rigid connecting plate 2 covers the top of the sample chamber 13, and the moisture-absorbing layer 3 is disposed below the rigid connecting plate 2 to absorb the gaseous water that migrates inside the soil sample 4; the weighing device is connected to the rigid connecting plate 13. The connecting plate 2 is used to measure the weight change of the moisture-absorbing layer 3. Specifically, the weighing device weighs the overall weight of the rigid connecting plate 2 and the moisture-absorbing layer 3. The weight of the rigid connecting plate 2 remains basically unchanged. The moisture-absorbing layer 3 absorbs the gaseous water that migrates inside the soil to be tested 4, thus causing a weight change. By measuring the overall weight change of the rigid connecting plate 2 and the moisture-absorbing layer 3, the weight change of the moisture-absorbing layer 3 can be obtained, and thus the mass of gaseous water migration can be obtained. The control system is signal-connected to the weighing device and the heating device. The control system can be selected according to the working needs, for example, a computer can be directly used as the control system.

[0044] In this embodiment, soil samples 4 with different moisture contents and densities are placed in the sample chamber 13. The soil samples 4 are heated by the heating device, which causes the gaseous water inside the soil samples 4 to migrate. The gaseous water that has migrated inside the soil samples 4 is absorbed by the hygroscopic layer 3. The weight change of the hygroscopic layer 3 is measured by the weighing device to obtain the mass of gaseous water migration. The weight change of the hygroscopic layer 3 over time is obtained by the control system, which enables real-time measurement of the mass of gaseous water migration in soil samples 4 with different moisture contents and densities.

[0045] In this embodiment, the moisture-absorbing layer 3 can be a moisture-absorbing plate, specifically a flat plate made of a loose and porous solid moisture-absorbing material (such as activated alumina or silica gel), used to adsorb gaseous water that migrates inside the soil 4 to be tested during the experiment.

[0046] In this embodiment, a thermal insulation cover 5 is also included. The thermal insulation cover 5 is installed on the outside of the sample chamber 13. The thermal insulation cover 5 can be made of thermal insulation materials such as polystyrene foam board to achieve thermal insulation. The bottom of the thermal insulation cover 5 is fixed to the base plate 8 by fixing bolts 7, and a first sealing ring 17 is provided between the bottom of the thermal insulation cover 5 and the base plate 8 for sealing. The top of the thermal insulation cover 5 is covered with an upper cover 1, and a second sealing ring 18 is provided between the upper cover 1 and the top of the thermal insulation cover 5 for sealing, thereby improving the sealing effect, preventing gaseous water leakage, and ensuring thermal insulation performance.

[0047] Furthermore, both the thermal insulation cover 5 and the upper cover 1 are provided with thermal insulation layers, preferably polystyrene insulation layers, to further improve the thermal insulation effect.

[0048] In this embodiment, a temperature and humidity sensor 22 is also included. The probe of the temperature and humidity sensor 22 can be inserted into the soil to be tested 4 to monitor the temperature and humidity of the soil to be tested 4. The temperature and humidity sensor 22 is connected to a data acquisition instrument 23, which is connected to the control system. The data acquisition instrument 23 is used to collect the temperature and humidity data monitored by the temperature and humidity sensor 22 and transmit it to the control system. The control system can control the output power of the heating device according to the monitored temperature and humidity signals.

[0049] The sample chamber 13 and the thermal insulation cover 5 are provided with corresponding sensor ports 9 for the temperature and humidity sensor 22 to be inserted. The gap between the temperature and humidity sensor 22 and the side wall of the sample chamber 13 and the side wall of the thermal insulation cover 5 is filled with sealing material to improve the sealing performance. Furthermore, the sealing material is preferably a thermal insulation material such as glass wool or rubber and plastic to improve the thermal insulation effect.

[0050] In this embodiment, to ensure accurate and reliable measurement results and reduce measurement errors caused by condensation or insufficient sealing, the insulation effect of the test system is also tested. The testing method specifically includes: using ComsolMultiphysics to establish a temperature distribution model of the soil to be tested 4, taking the geometry, boundary values, and heat transfer parameters (such as thermal conductivity, heat convection coefficient, etc.) of the soil to be tested 4 as inputs, simulating and calculating the temperature distribution of the soil to be tested 4, then determining the simulated temperature value at the location of the temperature and humidity sensor 22 based on the simulation results, and judging whether the insulation effect meets the requirements and whether it is necessary to continue filling the insulation material based on whether the difference between the currently obtained temperature value and the simulated temperature value is less than 5%.

[0051] In this embodiment, the sample chamber 13 is a cylindrical structure with openings at the top and bottom. The heating device is disposed on the base plate 8 and located at the bottom of the sample chamber 13. The rigid connecting plate 2 and the moisture-absorbing layer 3 are disposed inside the thermal insulation cover 5 and located above the sample chamber 13. Preferably, both the thermal insulation cover 5 and the sample chamber 13 are cylindrical structures. The inner wall of the thermal insulation cover 5 is in contact with the outer wall of the sample chamber 13. The diameters of the rigid connecting plate 2 and the moisture-absorbing layer 3 are the same as the inner diameter of the thermal insulation cover 5, thereby completely covering the inner cavity of the thermal insulation cover 5 in cross-section and preventing gaseous water leakage.

[0052] In this embodiment, the heating device mainly includes a heating plate 6, a temperature probe 20, and a temperature controller 21. A circular groove is provided in the middle of the base plate 8, and the heating plate 6 is located at the bottom of the circular groove. The bottom of the sample chamber 13 is also located in the circular groove and above the heating plate 6. The temperature probe 20 is located on the upper part of the heating plate 6 and is used to monitor the actual temperature of the heating plate 6. The temperature probe 20 is connected to the data acquisition instrument 23, which is connected to the control system. The data acquisition instrument 23 is used to collect the temperature data monitored by the temperature probe 20 and transmit the temperature data to the control system. The temperature controller 21 is connected to the heating plate 6 through a power line and is connected to the control system. The control system regulates the output power of the heating plate 6 through the temperature controller 21.

[0053] In this embodiment, based on the monitored temperature and humidity signals, the control system uses a PID control algorithm to calculate an appropriate output signal to control the output power of the heating plate 6, thereby maintaining a stable temperature within the test conditions. Specifically, the PID control algorithm controls the output power of the heating plate 6 by:

[0054] (1) Select appropriate PID parameters: PID parameters include proportional coefficient. Integral coefficient and differential coefficients These parameters directly affect the control performance of the PID controller, so their values ​​need to be selected according to the specific circumstances.

[0055] (2) Read sensor data: Before controlling the output power of the heating plate 6, it is necessary to read the environmental data within the test conditions in real time through the temperature and humidity sensor 22, including information such as temperature and humidity;

[0056] (3) Calculation error: Compare the read environmental data with the set target to obtain the deviation value. This deviation value can be expressed as the difference between the two. The smaller the deviation value, the closer the test conditions are to the set target.

[0057] (4) Calculate the control quantity: Calculate the control quantity of the PID controller based on the error; the control quantity is composed of the above three parameters. , , The specific calculation formula is as follows:

[0058]

[0059] Among them, the deviation is the current error, the cumulative deviation is the accumulation of historical errors, and the change in deviation is the difference between the current error and the previous error;

[0060] (5) Adjust the output power of heating plate 6: Adjust the output power of heating plate 6 according to the calculated control value; the larger the control value, the higher the output power of heating plate 6 needs to be, and vice versa.

[0061] (6) Repeat the above steps: By repeating the above steps (1)-(5), the temperature value under the test conditions can gradually approach the set target value through continuous adjustment.

[0062] In this embodiment, a support frame is also included, which mainly includes a vertical support rod 11, a horizontal support rod 12, and a cross clamp 19. One end of the horizontal support rod 12 is fixed to the top of the vertical support rod 11, which is perpendicular to the horizontal support rod 12, by the cross clamp 19. The vertical support rod 11 is fixed to the upper surface of the base plate 8. The top of the weighing device is set on the horizontal support rod 12 by fixing bolts 7, and the weighing device is located above the heat insulation cover 5. The top of the rigid connecting plate 2 is connected to a screw 15. The upper cover 1 is provided with a shaft hole for the screw 15 to pass through. The top end of the screw 15 passes upward through the shaft hole and is connected to the bottom of the weighing device through a hook 16. A buckle 14 is provided at the shaft hole. The screw 15 is fixed with the buckle 14 before the test starts and the buckle 14 is released when the test starts.

[0063] The weighing device is preferably a high-precision tension / compression sensor 10, or other weighing devices can be selected according to specific work needs.

[0064] This embodiment also provides a method for testing the quality of gaseous water migration, implemented using the gaseous water migration quality testing system described above, and mainly includes the following steps:

[0065] Step 1: Prepare a soil sample with a certain moisture content according to the standard of geotechnical testing method and let it stand. Take a certain mass of the soil sample after standing and measure its moisture content by drying method. Calculate and weigh the soil sample with the required moisture content. Put the weighed soil sample into the sample chamber 13 in 5 parts. After each layer is compacted and roughened, the upper layer of soil is put in to make the soil body to be tested 4.

[0066] Step 2: Place the heating plate 6 on the base plate 8 and connect the heating plate 6 to the temperature controller 21. Connect the temperature probe to the heating plate 6. After powering on, set the heating temperature through the temperature controller 21 to provide a continuous and constant temperature for the experiment.

[0067] Step 3: Place the sample chamber 13 containing the soil to be tested 4 on the heating plate 6, put the heat insulation cover 5 over the sample chamber 13 and fix it to the bottom plate 8 with the fixing bolts 7, insert the probe of the temperature and humidity sensor 22 into the soil to be tested 4, and seal the gap with heat insulation material.

[0068] Step 4: Fix the moisture-absorbing plate onto the rigid connecting plate 2. Connect the screw 15 to the rigid connecting plate 2. Apply a layer of Vaseline to the shaft hole of the upper cover 1. Use the buckle 14 to fix the screw 15 to the upper cover 1. Put the upper cover 1 on.

[0069] Step 5: Connect one end of the tension / compression sensor 10 to the horizontal support rod 12 with a bolt, and connect the other end to the hook 16;

[0070] Step 6: Open the buckle 14, connect the screw 15 to the hook 16, and then adjust the reading of the tension / compression sensor 10 to 0;

[0071] Step 7: Adjust the heating plate 6 to the required temperature for the test; the test begins, and data is collected through the control system and data acquisition instrument 23. Based on the collected temperature and humidity values, the output power of the heating plate 6 is automatically adjusted to maintain a constant temperature.

[0072] Step 8: The data acquisition instrument 23 acquires the moisture content and temperature data of the soil under test 4 collected by the temperature and humidity sensor 22 as time and temperature change, the control system acquires the tensile data of water vapor as time change measured by the tension and compression sensor 10, and converts the tensile data into mass data using the formula F=mg.

[0073] In the formula, F is the tension, m is the mass, and g is the gravitational acceleration, taken as 9.8 g / cm³.

[0074] Step 9: The test is over. Turn off the heating plate 6 and remove the temperature and humidity sensor 22.

[0075] This embodiment also provides a terminal, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the gaseous water migration quality testing method as described above.

[0076] This embodiment also provides a computer-readable storage medium storing a computer program, which, when executed, implements the gaseous water migration quality testing method described above.

[0077] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A gaseous water migration mass testing system, characterized in that: include: A sample chamber, wherein the sample chamber is used to place the soil to be tested; A heating device is used to heat the soil to be tested in the sample chamber; A mass measuring device includes a rigid connecting plate, a moisture-absorbing layer, and a weighing device. The rigid connecting plate covers the top of the sample chamber, and the moisture-absorbing layer is disposed below the rigid connecting plate to absorb gaseous water that migrates inside the soil to be tested. The weighing device is connected to the rigid connecting plate and is used to measure the weight change of the moisture-absorbing layer. The moisture-absorbing layer is a moisture-absorbing plate, which is a flat plate made of a loose, porous solid moisture-absorbing material. The control system is connected to the weighing device and the heating device by signal. The control system can obtain the value of the weight of the moisture-absorbing layer changing over time in order to measure the mass of gaseous water migration in real time. It also includes a thermal insulation cover, which is installed on the outside of the sample chamber, with the bottom of the thermal insulation cover fixed to the base plate and the top covered with a top cover; wherein, the sample chamber is a cylindrical structure with openings at the top and bottom, the heating device is installed on the base plate and located at the bottom of the sample chamber, and the rigid connecting plate and the moisture-absorbing layer are installed inside the thermal insulation cover and located above the sample chamber; It also includes a temperature and humidity sensor, the probe of which can be inserted into the soil to be tested to monitor the temperature and humidity of the soil. The temperature and humidity sensor is connected to a data acquisition instrument, which is connected to the control system. The data acquisition instrument is used to collect the temperature and humidity data monitored by the temperature and humidity sensor and transmit it to the control system. The sample chamber and the thermal insulation cover are provided with corresponding sensor ports for the temperature and humidity sensor to be inserted. The gap between the temperature and humidity sensor and the side wall of the sample chamber and the side wall of the thermal insulation cover is filled with a sealing material, which is a thermal insulation material. The control system can acquire the temperature and humidity of the soil to be tested and adjust the output power of the heating device to maintain a stable temperature in the sample chamber. The control system can also detect the insulation effect of the sample chamber, establish a temperature distribution model of the soil to be tested, simulate and calculate the temperature distribution of the soil to be tested using the geometry, boundary values ​​and heat transfer parameters of the soil to be tested as input, determine the simulated temperature of the soil to be tested based on the simulation results, compare the difference between the currently obtained temperature and the simulated temperature, and if the difference is less than 5%, it is determined that the insulation effect of the sample chamber meets the requirements; otherwise, it is determined that the insulation effect of the sample chamber does not meet the requirements. The heating device includes a heating plate and a temperature probe. The heating plate is disposed on the base plate and covers the bottom opening of the sample chamber. The temperature probe is disposed on the upper part of the heating plate and is used to monitor the actual temperature of the heating plate. The temperature probe is connected to a data acquisition instrument, which is connected to a control system. The control system controls the output power of the heating plate using a PID control algorithm. The calculation formula for the control quantity of the PID control algorithm is as follows: Control quantity = K p * Deviation + K i *Cumulative deviation + K d *Change in deviation Among them, the deviation is the current error, the cumulative deviation is the accumulation of historical errors, the change in deviation is the difference between the current error and the previous error, KP is the proportional coefficient, Ki is the integral coefficient, and Kd is the differential coefficient. It also includes a support frame, on which the weighing device is mounted and located above the heat insulation cover; a screw is connected to the top of the rigid connecting plate, and a shaft hole is provided on the upper cover for the screw to pass through. The top end of the screw passes through the shaft hole upward and is connected to the bottom of the weighing device through a hook; a buckle is provided at the shaft hole, which can fix the screw on the upper cover.

2. The gaseous water migration quality testing system according to claim 1, characterized in that: The heating device also includes a temperature controller. The data acquisition instrument is used to collect the temperature data monitored by the temperature probe and transmit the temperature data to the control system. The temperature controller is connected to the heating plate via a power cord and is signal-connected to the control system. The control system regulates the output power of the heating plate through the temperature controller.

3. The gaseous water migration quality testing system according to claim 1, characterized in that: in, The weighing device is a tension / compression sensor.

4. A method for testing the migration mass of gaseous water, characterized in that: The test is carried out using the gaseous water migration quality testing system as described in any one of claims 1-3, and includes the following steps: S1. The soil to be tested is loaded into the sample chamber; S2. Conduct a moisture evaporation test on the soil to be tested. The soil to be tested is heated by the heating device. The moisture-absorbing layer adsorbs the gaseous water that migrates inside the soil to be tested. The weight change of the moisture-absorbing layer is measured by the weighing device. S3. The weight of the moisture-absorbing layer changes over time through the control system to measure the mass of gaseous water migration in real time.

5. The method for testing the migration quality of gaseous water according to claim 4, characterized in that: Before step S1, the following step is also included: S101. Prepare a soil sample with a predetermined moisture content and let it stand; fill the soil sample into the test chamber in multiple batches to obtain the soil to be tested; wherein, after each layer of soil sample is filled, the surface is roughened after interlayer compaction, and then the upper layer of soil sample is filled. S102. Assemble the heating device and the mass measuring device.

6. The method for testing the migration quality of gaseous water according to claim 4, characterized in that: In step S2, the control system acquires the temperature and humidity of the soil to be tested and adjusts the output power of the heating device to maintain a stable temperature in the sample chamber. Simultaneously, the insulation effect of the test chamber is tested, and a temperature distribution model of the soil to be tested is established. Using the geometry, boundary values, and heat transfer parameters of the soil to be tested as input, the temperature distribution of the soil to be tested is simulated and calculated. Then, the simulated temperature of the soil to be tested is determined based on the simulation results. The difference between the currently obtained temperature and the simulated temperature is compared. When the difference is less than 5%, it is determined that the insulation effect of the test chamber meets the requirements. Otherwise, it is determined that the insulation effect of the test chamber does not meet the requirements, the test is stopped, and the insulation effect of the test chamber is improved. In step S4, the control system plots a curve showing the change in the mass of gaseous water migration over time based on the change in the weight of the moisture-absorbing layer over time.

7. A terminal, characterized in that: It includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the gaseous water migration quality testing method as described in any one of claims 4-6.

8. A computer-readable storage medium, characterized in that, The storage medium stores a computer program, which, when executed, implements the gaseous water migration quality testing method as described in any one of claims 4-6.

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