Measurement method of matric suction for correcting supergravity influence of centrifugal method
By combining drying shrinkage and centrifugation tests, the influence of hypergravity was corrected, the matrix suction of unsaturated soil was accurately measured, the deformation problem of the centrifugation method in the measurement of soil-water characteristic curves was solved, and high-precision soil-water characteristic curve fitting was achieved.
Patent Information
- Application Number
- CN202511913879.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-18
- Publication Date
- 2026-02-24
AI Technical Summary
When measuring the soil-water characteristic curve of unsaturated soil using existing centrifugation methods, the deformation effect caused by hypergravity cannot be separated, resulting in inaccurate test results, especially in soils with low initial dry density, where matrix suction cannot be accurately measured.
Two sets of parallel saturated soil samples were prepared, and drying shrinkage and centrifugation tests were conducted respectively. The volume and moisture changes of the soil samples were recorded. The volumetric water content and mass water content of the soil samples were calculated by combining laser ranging and weighing. The influence of hypergravity was corrected, and the soil-water characteristic curve was fitted using the van Genuchten function.
It enables rapid and accurate measurement of soil-water characteristic curves in unsaturated soils, isolates soil sample deformation affected by hypergravity, and provides soil-water characteristic curves affected only by matrix suction, thus improving measurement accuracy.
Smart Images
Figure CN121558458A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of unsaturated soils, and more particularly to a method for measuring matrix suction that corrects for the effects of centrifugation on hypergravity. Background Technology
[0002] Soil-water characteristic curves represent the relationship between soil moisture content and matric suction, and are fundamental parameters for evaluating the engineering strength, deformation, and seepage characteristics of unsaturated soils. Numerous methods exist for testing soil-water characteristic curves, each subject to unique external influences during the testing process, leading to discrepancies in the consistency of data obtained from different methods. Therefore, studying the factors affecting testing methods and their subsequent impact on test results is of significant engineering value for improving the accuracy and expanding the applicability of soil-water characteristic curve testing.
[0003] Generally, the pressure plate method, filter paper method, steam equilibrium method, and centrifugation method have a wide testing range and are used in engineering applications to evaluate soil matrix suction and establish soil-water characteristic curves. Among them, the centrifugation method is widely used due to its advantages such as short testing time and convenient control conditions. The typical centrifugation method is based on the physical similarity between centrifugal force and gravity, using centrifugal force to simulate changes in the stress state of materials. Centrifugal force can be used for various types of loads to achieve the same effect, but the additional response generated by centrifugal force may also affect the overall effect.
[0004] Combined centrifugation and drying shrinkage tests on soil samples with different initial dry densities showed that the soil-water characteristic curves obtained using this method followed the same drying path. The hypergravity environment had a greater impact on soils with lower initial dry densities, resulting in the centrifugation method yielding a higher soil-water characteristic curve than the suction deformation method. If the effect of hypergravity on deformation cannot be isolated, the centrifugation method may be unsuitable for soil-water characteristic testing, except in the case of dense soils.
[0005] For example, during dehydration under different centrifugal loads, uncontrollable deformation occurs in the soil. This deformation affects the calculation of sample saturation, making it impossible to determine the relationship between centrifugal force and sample saturation. Literature studies indicate that the increase in soil compaction during centrifugation can be corrected by volumetric deformation. However, the deformation generated during centrifugation is caused by both hypergravity and matrix suction. Coupled deformation caused by these two forces to predict matrix suction leads to differences in soil-water characteristic curves obtained by centrifugation and pressure plate methods.
[0006] Therefore, there is an urgent need for a reliable and rapid testing method for measuring the soil-water characteristic curve of soil, which is of great significance for the accurate measurement of the soil-water characteristic curve of unsaturated soil. Summary of the Invention
[0007] The technical problem to be solved by the present invention is to provide a method for measuring matrix suction that corrects the influence of centrifugation on hypergravity, thereby improving the measurement accuracy of soil-water characteristic curves of unsaturated soil and addressing the deficiencies in the prior art.
[0008] The technical solution adopted by this invention to solve its technical problem is: This invention provides a method for measuring matrix suction that corrects for the influence of centrifugation on hypergravity. The method includes the following steps: Step 1: Prepare two sets of parallel saturated soil samples and record the soil particle weight and saturated soil moisture content of the soil samples before the test; Step 2: Conduct a drying shrinkage test. Place a set of soil samples in the drying shrinkage platform. Use an industrial camera, laser rangefinder, and balance inside the drying shrinkage platform to measure the changes in diameter, height, and weight of the soil samples at each moment during the natural drying and evaporation process. Calculate the volume, volumetric water content, and mass moisture content of the soil samples based on the measurement results. Step 3: Conduct a centrifugation test. Place another set of soil samples into a centrifuge cup, place the centrifuge cup into the centrifuge rotor, and set the centrifuge speed, centrifugation time, and number of centrifugation tests. Step 4: After the centrifuge completes the centrifugation test at a certain speed, place the soil sample on the laser ranging platform and measure the settlement deformation of the soil sample to correct the influence of volume deformation on the suction calculation. Weigh the soil sample to determine the drainage volume of the soil sample under each centrifugal force. Based on the drainage volume and volume change under different centrifugal forces, determine the volumetric moisture content and mass moisture content of soil samples with different initial dry densities, and calculate the matrix suction of the soil sample at each speed. Based on the settlement height and drainage volume of the soil sample, calculate the volume, volumetric moisture content, and mass moisture content of the soil sample at each speed. Step 5: In the centrifugation test, the soil sample only undergoes vertical deformation, while in the drying shrinkage test, the soil sample undergoes both vertical and horizontal deformation. By incorporating the volume change of the soil sample at each speed in the centrifugation test and the volume change of the soil sample in the drying shrinkage test into the matrix suction calculation, the matrix suction, which includes both gravity deformation and suction deformation, is determined.
[0009] Furthermore, the calculation method in step 2 of the present invention includes: The formula for calculating the volume of a soil sample is: (1) The formula for calculating the volumetric water content of a soil sample is: (2) The formula for calculating the mass moisture content of a soil sample is: (3) In the formula: V dThe volume of the soil sample in the drying shrinkage test is expressed in cm³. 3 ; r The initial radius of the soil sample is in cm. Δr The shrinkage radius of the soil sample at each moment is expressed in cm. H This represents the initial height of the soil sample, in cm. ΔH This represents the settlement of the soil sample at each moment, in cm. r w This is the density of water, expressed in g / cm³. 3 ; m w This represents the water content of saturated soil, expressed in grams. Δm w This represents the cumulative evaporation water content of the soil sample at each time point, expressed in grams. m s This represents the weight of soil particles in the soil sample, expressed in grams.
[0010] Furthermore, the method for performing the centrifugation test in step 3 of the present invention includes: Place the parallel saturated soil sample into a centrifuge cup, then place the centrifuge cup into the centrifuge rotor and set the centrifuge speed to [speed value missing]. n i Centrifugation time is t i ,in i Indicates the number of centrifugation tests. i =1, 2, 3, ... n i Indicates the first i The centrifuge speed during the centrifugation test. t i Indicates the first i Centrifugation time during the first centrifugation test.
[0011] Furthermore, the method for calculating the matrix suction of the soil sample at each rotational speed in step 4 of the present invention includes: Wait for the centrifuge to complete its rotation speed n i After centrifugation, the soil sample was placed on a laser ranging platform to measure the settlement deformation of the soil sample, which was used to correct the influence of volume deformation on the suction calculation. The soil sample weight was also measured to determine the water displacement at each centrifugal force level. Based on the water displacement and volume change under different centrifugal forces, the volumetric water content and mass water content of soil samples with different initial dry densities were determined. The formula for calculating the matrix suction of the soil sample at each rotational speed level is as follows: (4) In the formula: P i This refers to the matrix suction, expressed in Pa. n iThe centrifuge speed is expressed in r / min; g is the acceleration due to gravity, expressed in cm / s². 2 ; L This is the distance from the center of the rotor to the bottom of the soil sample, in cm; l This is the distance from the center of the rotor to the top of the soil sample, in cm; Dh i The value represents the settlement height of the soil sample at each level, in cm.
[0012] Furthermore, the method for calculating the volume, volumetric water content, and mass water content of the soil sample at each rotational speed in step 4 of the present invention includes: Based on the settlement height and drainage volume of the soil sample, the volume of the soil sample at each rotational speed was calculated. V ci Volumetric moisture content i wi and moisture content M wi The formula is: (5) (6) (7) In the formula: V ci The volume of the soil sample in the centrifugation test is expressed in cm³. 3 ; r The initial radius of the soil sample is in cm. m w This represents the water content of saturated soil, expressed in grams. Δm wi ’ This represents the cumulative water displacement at each rotational speed, in grams. m s This represents the weight of soil particles in the soil sample, expressed in grams.
[0013] Furthermore, the method in step 5 of the present invention specifically includes: Divide the soil sample volume in the drying shrinkage test by its initial area to establish the vertical height associated with the centrifugation test, calculate the matrix suction of the soil sample in the drying shrinkage test, and calculate the vertical deformation of the soil sample in the drying shrinkage test. No The calculation formula is: (8) The matrix suction at each rotational speed of the soil sample, combined with the volume change of the soil sample at each rotational speed, is used to determine the matrix suction that includes the dual effects of gravity deformation and suction deformation; the matrix suction at each rotational speed of the soil sample, combined with the volume change of vertical deformation, is used to determine the matrix suction that includes the effect of suction deformation; the formula for the matrix suction corresponding to the moisture content at each moment in the drying shrinkage test is: (9) In the formula: P i ’ The value represents the matrix suction corresponding to the moisture content at each moment during the drying shrinkage test, expressed in Pa.
[0014] Furthermore, the method of the present invention also includes a method for obtaining a modified soil-water characteristic curve: Using the same mass moisture content in centrifugation and drying shrinkage tests M w As a bridge, the matrix suction converted from the centrifugation test and the volumetric moisture content from the drying shrinkage test are used. i w To establish a connection; The soil-water characteristic curve under matric suction alone is determined by matric suction and volumetric water content; matric suction is calculated by the formula of matric suction corresponding to water content at each moment of the drying shrinkage test, and volumetric water content is calculated by the formula of volumetric water content of the soil sample. The soil-water characteristic curves are fitted using a model.
[0015] Furthermore, the fitting model used for the soil-water characteristic curve in the method of the present invention is the van Genuchten function prediction model.
[0016] This invention provides a measurement system for matrix suction that corrects for the effects of centrifugation on hypergravity, comprising: Memory, used to store executable computer programs; The processor, when executing an executable computer program stored in the memory, implements the method for measuring matrix suction under the influence of centrifugation and hypergravity.
[0017] The present invention provides a computer-readable storage medium storing a computer program for implementing, when executed by a processor, the method for measuring matrix suction under the influence of centrifugation and correcting for the effects of hypergravity.
[0018] The beneficial effects of this invention are: This invention proposes a method for measuring matrix suction by correcting the influence of hypergravity in centrifugation. This method involves conducting centrifugation and drying shrinkage tests on soil samples under the same working conditions, recording the volumetric deformation and moisture evaporation of the soil samples during these tests. Based on this, the centrifugation and drying shrinkage tests are connected by mass moisture content to obtain the volume of the soil sample at the same mass moisture content. In the centrifugation test, the soil sample only experiences vertical shrinkage, not horizontal shrinkage. The matrix suction at each stage can be calculated by correcting the distance between the top surface of the soil sample and the central axis of the centrifuge. In the drying shrinkage test, the soil sample experiences both vertical and horizontal shrinkage. The vertical shrinkage under the condition of no horizontal shrinkage can be obtained through volume conversion. Finally, the matrix suction of the soil sample under the drying shrinkage condition can be obtained using the matrix suction calculation formula in the centrifugation method.
[0019] The method of this invention can quickly obtain the soil-water characteristic curve of soil sample during the dehydration process. The method can separate the soil sample deformation affected by the centrifuge's hypergravity and obtain the soil sample deformation affected only by the suction of the soil sample's own matrix. This method is of great significance for the accurate measurement of the soil-water characteristic curve of unsaturated soil. Attached Figure Description
[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings: Figure 1 These are the test results of soil-water characteristic curves for soil samples with different initial dry densities according to embodiments of the present invention; Figure 2 These are the soil-water characteristic curve test results of soil samples with different initial dry densities corrected for hypergravity deformation according to embodiments of the present invention; Figure 3 This is a flowchart of a method according to an embodiment of the present invention. Detailed Implementation
[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.
[0022] Example 1 This invention proposes a method for measuring matrix suction that corrects for the influence of centrifugation on hypergravity, such as... Figure 3 As shown, the method includes the following steps: 1) Prepare two sets of parallel saturated soil samples and record the weight of soil particles in the soil samples before the test. m s and the quality of water m w .
[0023] 2) Conduct a drying shrinkage test. Place the soil sample in a drying shrinkage platform. Using an industrial camera, laser rangefinder, and balance within the platform, record the changes in diameter, height, and weight of the soil sample at each moment during the natural drying and evaporation process. Calculate the volume of the soil sample using formulas (1), (2), and (3). V d ), volumetric water content ( i w ) and mass moisture content ( M w Formulas (1), (2), and (3) are as follows: (1) (2) (3) In the formula, V d The volume of the soil sample in the drying shrinkage test is expressed in cm³. 3 ; r The initial radius of the soil sample is in cm. Δr The shrinkage radius of the soil sample at each moment is expressed in cm. H This represents the initial height of the soil sample, in cm. ΔH This represents the settlement of the soil sample at each moment, in cm. r w This is the density of water, expressed in g / cm³. 3 ; m w This represents the water content of saturated soil, expressed in grams. Δm w This represents the cumulative evaporation water content of the soil sample at each time point, expressed in grams. m s This represents the weight of soil particles in the soil sample, expressed in grams.
[0024] 3) Conduct a centrifugation test. Place the parallel saturated soil sample from step 1) into a centrifuge cup, then place the centrifuge cup into the centrifuge rotor. Set the centrifuge speed to [speed value missing]. n i Centrifugation time is t i ,in i Indicates the number of centrifugation tests. i =1, 2, 3, ... n i Indicates the first i The centrifuge speed during the centrifugation test. t i Indicates the first i Centrifugation time during the first centrifugation test.
[0025] 4) Wait for the centrifuge to complete its rotation speed.n i After centrifugation, the soil sample was placed on a laser ranging platform, and the settlement deformation of the sample was measured to correct the influence of volume deformation on the suction calculation. The weight of the sample was also weighed to determine the drainage volume of the sample under each centrifugal force. Based on the drainage volume and volume change under different centrifugal forces, the volumetric water content and mass water content of samples with different initial dry densities were determined, and the matrix suction of the soil sample under each rotation speed was calculated using formula (4). Formula (4) is: (4) In the formula: P i This refers to the matrix suction, expressed in Pa. n i The centrifuge speed is expressed in r / min; g is the acceleration due to gravity, expressed in cm / s². 2 ; L This is the distance from the center of the rotor to the bottom of the sample, in cm; l The distance from the rotor center to the top of the sample is in cm; Dh i The value represents the sedimentation height of the sample at each stage, in cm.
[0026] Based on the settlement height and drainage volume of the soil sample, the volume of the soil sample at each rotational speed is calculated using formulas (5), (6), and (7). V ci ), volumetric moisture content ( i wi ) and mass moisture content ( M wi Formulas (5), (6) and (7) are: (5) (6) (7) In the formula: V ci The volume of the sample in the centrifugation test is expressed in cm³. 3 ; r The initial radius of the soil sample is in cm. m w This represents the water content of saturated soil, expressed in grams. Δm wi ’ This represents the cumulative water displacement at each rotational speed, in grams. m s This represents the weight of soil particles in the soil sample, expressed in grams.
[0027] 5) In the centrifugation test, the soil sample only undergoes vertical deformation, while in the drying shrinkage test, the soil sample undergoes both vertical and horizontal deformation. The vertical height associated with the centrifugation test is established by dividing the volume of the soil sample in the drying shrinkage test by its initial area. Subsequently, the matrix suction of the sample in the drying shrinkage test is calculated using equation (4). The vertical deformation of the sample in the drying shrinkage test ( D h’ In the centrifugation test, the result can be calculated using equation (8): (8) By introducing the volume change from equation (5) into equation (4), the matrix suction force, which includes the combined effects of hypergravity deformation and suction deformation, can be determined. Similarly, by introducing the volume change from equation (8) into equation (4), the matrix suction force, which includes the influence of suction deformation, can be determined and can be calculated by equation (9): (9) In the formula: P i ’ The value represents the matrix suction corresponding to the moisture content at each moment during the drying shrinkage test, expressed in Pa.
[0028] The same centrifugation test and drying shrinkage test M w As a bridge, it can connect the matrix suction calculated in the centrifugation test with that in the drying shrinkage test. i w A correlation is established. This correlation allows for the acquisition of a modified soil-water characteristic curve after considering the volumetric deformation caused solely by matrix suction. Based on this, the soil-water characteristic curve caused solely by matrix suction can be determined by matrix suction and volumetric water content using equations (9) and (2). Simultaneously, the soil-water characteristic curve can be fitted using a van Genuchten function prediction model.
[0029] This method can correct the calculation method of matrix suction under the influence of hypergravity, and provide a reliable measurement method for measuring the soil-water characteristic curve of unsaturated soil.
[0030] Example 2 Two sets of parallel remolded soil samples with different initial dry densities were prepared and used for centrifugation and shrinkage tests, respectively. Detailed information on the parallel samples is shown in Table 1.
[0031] Table 1. Information on parallel samples
[0032] Using a proposed method to calculate matrix suction by correcting the effects of centrifugation on hypergravity, the test results are shown in [Figure 1]. Figure 1 and Figure 2 As shown.
[0033] Soil-water characteristic curves obtained using the centrifugation-drying shrinkage combined test method for soil samples with different initial dry densities follow the same drying path. The hypergravity environment has a greater impact on soils with lower initial dry densities, resulting in the soil-water characteristic curves measured by the centrifugation method being higher than those measured by the suction deformation method. If the effect of hypergravity on deformation cannot be isolated, the centrifugation method may not be suitable for soil-water characteristic testing, except in the case of dense soils.
[0034] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.
[0035] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.
Claims
1. A method for measuring matrix suction that corrects for the influence of centrifugation on hypergravity, characterized in that, The method includes the following steps: Step 1: Prepare two sets of parallel saturated soil samples and record the soil particle weight and saturated soil moisture content of the soil samples before the test; Step 2: Conduct a drying shrinkage test. Place a set of soil samples in the drying shrinkage platform. Use an industrial camera, laser rangefinder, and balance inside the drying shrinkage platform to measure the changes in diameter, height, and weight of the soil samples at each moment during the natural drying and evaporation process. Calculate the volume, volumetric water content, and mass moisture content of the soil samples based on the measurement results. Step 3: Conduct a centrifugation test. Place another set of soil samples into a centrifuge cup, place the centrifuge cup into the centrifuge rotor, and set the centrifuge speed, centrifugation time, and number of centrifugation tests. Step 4: After the centrifuge completes the centrifugation test at a certain speed, place the soil sample on the laser ranging platform and measure the settlement deformation of the soil sample to correct the influence of volume deformation on the suction calculation. Weigh the soil sample to determine the drainage volume of the soil sample under each centrifugal force. Based on the drainage volume and volume change under different centrifugal forces, determine the volumetric moisture content and mass moisture content of soil samples with different initial dry densities, and calculate the matrix suction of the soil sample at each speed. Based on the settlement height and drainage volume of the soil sample, calculate the volume, volumetric moisture content, and mass moisture content of the soil sample at each speed. Step 5: In the centrifugation test, the soil sample only undergoes vertical deformation, while in the drying shrinkage test, the soil sample undergoes both vertical and horizontal deformation. By incorporating the volume change of the soil sample at each speed in the centrifugation test and the volume change of the soil sample in the drying shrinkage test into the matrix suction calculation, the matrix suction, which includes both gravity deformation and suction deformation, is determined.
2. The method for measuring matrix suction under the influence of centrifugation and corrected for the effects of hypergravity, as described in claim 1, is characterized in that... The calculation method in step 2 includes: The formula for calculating the volume of a soil sample is: （1） The formula for calculating the volumetric water content of a soil sample is: （2） The formula for calculating the mass moisture content of a soil sample is: （3） In the formula: V d The volume of the soil sample in the drying shrinkage test is expressed in cm³. 3 ; r The initial radius of the soil sample is in cm. Δr The shrinkage radius of the soil sample at each moment is expressed in cm. H This represents the initial height of the soil sample, in cm. ΔH This represents the settlement of the soil sample at each moment, in cm. ρ w This is the density of water, expressed in g / cm³. 3 ; m w This represents the water content of saturated soil, expressed in grams. Δm w This represents the cumulative evaporation water content of the soil sample at each time point, expressed in grams. m s This represents the weight of soil particles in the soil sample, expressed in grams.
3. The method for measuring matrix suction under the influence of centrifugation and corrected for the effects of hypergravity, as described in claim 1, is characterized in that... The method for performing the centrifugation test in step 3 includes: Place the parallel saturated soil sample into a centrifuge cup, then place the centrifuge cup into the centrifuge rotor and set the centrifuge speed to [speed value missing]. n i Centrifugation time is t i ,in i Indicates the number of centrifugation tests. i =1, 2, 3, ... n i Indicates the first i The centrifuge speed during the centrifugation test. t i Indicates the first i Centrifugation time during the first centrifugation test.
4. The method for measuring matrix suction under the influence of centrifugation and corrected for the effects of hypergravity, as described in claim 1, is characterized in that... The method for calculating the matrix suction of the soil sample at each rotational speed in step 4 includes: Wait for the centrifuge to complete its rotation speed n i After centrifugation, the soil sample was placed on a laser ranging platform to measure the settlement deformation of the soil sample, which was used to correct the influence of volume deformation on the suction calculation. The soil sample weight was also measured to determine the water displacement at each centrifugal force level. Based on the water displacement and volume change under different centrifugal forces, the volumetric water content and mass water content of soil samples with different initial dry densities were determined. The formula for calculating the matrix suction of the soil sample at each rotational speed level is as follows: （4） In the formula: Ψ i This refers to the matrix suction, expressed in Pa. n i The centrifuge speed is expressed in r / min; g is the acceleration due to gravity, expressed in cm / s². 2 ; L This is the distance from the center of the rotor to the bottom of the soil sample, in cm; l This is the distance from the center of the rotor to the top of the soil sample, in cm; Δh i The value represents the settlement height of the soil sample at each level, in cm.
5. The method for measuring matrix suction under the influence of centrifugation and corrected for the effects of hypergravity, as described in claim 4, is characterized in that... The methods for calculating the volume, volumetric moisture content, and mass moisture content of the soil sample at each rotational speed in step 4 include: Based on the settlement height and drainage volume of the soil sample, the volume of the soil sample at each rotational speed was calculated. V ci Volumetric moisture content θ wi and moisture content M wi The formula is: （5） （6） （7） In the formula: V ci The volume of the soil sample in the centrifugation test is expressed in cm³. 3 ; r The initial radius of the soil sample is in cm. m w This represents the water content of saturated soil, expressed in grams. Δm wi ’ This represents the cumulative water displacement at each rotational speed, in grams. m s This represents the weight of soil particles in the soil sample, expressed in grams.
6. The method for measuring matrix suction under the influence of centrifugation on hypergravity according to claim 1, characterized in that, The method in step 5 specifically includes: Divide the soil sample volume in the drying shrinkage test by its initial area to establish the vertical height associated with the centrifugation test, calculate the matrix suction of the soil sample in the drying shrinkage test, and calculate the vertical deformation of the soil sample in the drying shrinkage test. Δh' The calculation formula is: （8） The matrix suction at each rotational speed of the soil sample, combined with the volume change of the soil sample at each rotational speed, is used to determine the matrix suction that includes the dual effects of gravity deformation and suction deformation; the matrix suction at each rotational speed of the soil sample, combined with the volume change of vertical deformation, is used to determine the matrix suction that includes the effect of suction deformation; the formula for the matrix suction corresponding to the moisture content at each moment in the drying shrinkage test is: （9） In the formula: Ψ i ’ The value represents the matrix suction corresponding to the moisture content at each moment during the drying shrinkage test, expressed in Pa.
7. The method for measuring matrix suction under the influence of centrifugation on hypergravity as described in claim 6, characterized in that, The method also includes a method for obtaining modified soil-water characteristic curves: Using the same mass moisture content in centrifugation and drying shrinkage tests M w As a bridge, the matrix suction converted from the centrifugation test and the volumetric moisture content from the drying shrinkage test are used. θ w To establish a connection; The soil-water characteristic curve under matric suction alone is determined by matric suction and volumetric water content; matric suction is calculated by the formula of matric suction corresponding to water content at each moment of the drying shrinkage test, and volumetric water content is calculated by the formula of volumetric water content of the soil sample. The soil-water characteristic curves are fitted using a model.
8. The method for measuring matrix suction under the influence of centrifugation and corrected for the effects of hypergravity, as described in claim 7, is characterized in that... The fitting model used for the soil-water characteristic curve in this method is the van Genuchten function prediction model.
9. A measurement system for matrix suction that corrects for the effects of centrifugation on hypergravity, characterized in that, include: Memory, used to store executable computer programs; A processor, when executing an executable computer program stored in a memory, implements the method for measuring matrix suction by correcting the effects of centrifugation on hypergravity as described in any one of claims 1 to 8.
10. A computer-readable storage medium, characterized in that, The device contains a computer program that, when executed by a processor, implements the method for measuring matrix suction by correcting the effects of centrifugation on hypergravity, as described in any one of claims 1 to 8.