A method and system for determining the permeability coefficient of rock and soil considering the influence of tortuosity

Abstract

The present invention relates to the technical field of environmental protection and ecological restoration, and specifically to a method and system for determining the permeability coefficient of a rock and soil body taking into account the influence of tortuosity. The method for determining the permeability coefficient of a rock and soil body taking into account the influence of tortuosity provided by the present invention comprises the following steps: obtaining the test parameters of the rock and soil body to be determined; determining the porosity of the rock and soil body to be determined using the test parameters; determining the tortuosity of the rock and soil body to be determined according to the porosity and the test parameters; determining the permeability coefficient of the rock and soil body to be determined through the tortuosity, the porosity and the test parameters. The present invention fully considers the comprehensive influence of rock and soil particle grading, porosity and tortuosity on the permeability of the rock and soil body, realizes the simplification of the parameter determination process, the reduction of costs and the precision of the results, and has high practical value and promotion value in the technical field of environmental protection and ecological restoration.

Description

Technical Field

[0001] The present invention relates to the technical field of environmental protection and ecological restoration, and in particular to a method and system for determining the permeability coefficient of a rock and soil body taking into account the influence of tortuosity. Background Art

[0002] Permeability coefficient is a key indicator that comprehensively reflects the permeability of rock and soil, and is used to characterize the permeability and flow performance of fluids in the pores of rock and soil. Therefore, determining the permeability coefficient of rock and soil is helpful to evaluate the stability of rock and soil structure.

[0003] In the prior art, the first type of technology determines the permeability coefficient of rock and soil by using constant head and variable head permeability test methods in the laboratory or at the construction site. The test method has the following problems: first, due to the influence of instrument size and boundary effect in the laboratory, the determined permeability coefficient is not accurate enough; second, due to the difficulty in construction at the construction site, the permeability coefficient determination process is relatively complicated and the cost is too high; the second type of technology uses the empirical formula method to determine the permeability coefficient of rock and soil. The formula method does not fully consider the comprehensive influence of factors such as rock and soil particle grading, porosity and tortuosity, resulting in a large deviation between the obtained rock and soil permeability coefficient and the actual result.

[0004] The above existing technologies are difficult to meet actual needs. Therefore, it is urgent to propose a simple and reliable method for determining the permeability coefficient of rock and soil. Summary of the invention

[0005] In view of the defects in the prior art, the present invention provides a method and system for determining the permeability coefficient of a rock and soil mass taking into account the influence of tortuosity.

[0006] On the one hand, the method for determining the permeability coefficient of rock and soil mass considering the influence of tortuosity includes the following steps: obtaining the test parameters of the rock and soil mass to be determined; determining the porosity of the rock and soil mass to be determined using the test parameters; determining the tortuosity of the rock and soil mass to be determined according to the porosity and the test parameters; determining the permeability coefficient of the rock and soil mass to be determined through the tortuosity, the porosity and the test parameters. The present invention fully considers the comprehensive influence of rock and soil mass test parameters, rock and soil mass porosity and rock and soil mass tortuosity on the permeability performance of the rock and soil mass, realizes efficient mapping from microstructure to macroscopic permeability performance, enriches the theoretical system of rock and soil mass permeability research, and has high practical value and promotion value in the field of environmental protection and ecological restoration technology.

[0007] Optionally, the obtaining of the test parameters of the rock and soil mass to be determined includes: obtaining the density of the rock and soil mass to be determined r ; Obtain the mass water content of the rock and soil mass to be determined oh ; Obtain the specific gravity of the rock and soil mass to be determined G s. The present invention covers in detail key indicators such as rock and soil density, rock and soil water content and rock and soil specific gravity. The rock and soil density reflects the relationship between the mass distribution and volume of the rock and soil, and is the basis for evaluating its bearing capacity and stability; the mass water content of the rock and soil is directly related to the hydraulic properties of the rock and soil, and has a significant impact on the permeability of the rock and soil; the rock and soil specific gravity reflects the density characteristics of the solid particles of the rock and soil. By accurately acquiring the rock and soil test parameters, the characteristics of the rock and soil can be fully reflected, providing solid data support for the subsequent determination of the rock and soil permeability coefficient, making the results reliable.

[0008] Optionally, the step of obtaining the test parameters of the rock and soil mass to be determined further comprises: obtaining the particle grading parameters of the rock and soil mass to be determined, wherein the particle grading parameters include the equivalent particle size d 20 and average particle size d 50 The rock mass particle grading parameters obtained by the present invention describe the distribution of particles of different particle sizes in the rock mass, are related to the pore structure, permeability and mechanical response of the rock mass, directly affect the determination of the permeability coefficient of the rock mass, and play a vital role in evaluating the stability and permeability of the rock mass.

[0009] Optionally, the determining the porosity of the rock mass to be determined by using the test parameters includes: calculating an expression of the porosity of the rock mass to be determined by using the test parameters; and determining the porosity of the rock mass to be determined according to a result of the expression calculation. The porosity of the rock mass calculated by using the rock mass porosity expression of the present invention is of great significance for determining the permeability coefficient of the rock mass.

[0010] Optionally, the porosity is expressed as follows:

[0011] ,

[0012] in, is the porosity of the rock mass, is the density of pure distilled water at 4°C, r is the density of the rock mass, oh is the mass water content of the rock mass, G s The present invention fully considers the characteristics of the pore structure of the rock and soil, connects multiple parameters influencing the pore structure of the rock and soil in series, and obtains the porosity of the rock and soil through only one expression, creating basic conditions for determining the permeability coefficient of the rock and soil.

[0013] Optionally, the determining the tortuosity of the rock mass to be determined according to the porosity and the test parameters comprises: calculating an expression for the tortuosity of the rock mass to be determined according to the porosity and the test parameters; and determining the tortuosity of the rock mass to be determined according to a result of the expression calculation. The present invention determines the tortuosity for revealing the complexity and tortuosity of the fluid flow path in the rock mass by comprehensively considering parameters such as the porosity and particle grading of the rock mass, which is conducive to further determining the permeability coefficient of the rock mass.

[0014] Optionally, the expression of the tortuosity is as follows:

[0015] ,

[0016] in, is the tortuosity of the rock mass, is the porosity of the rock mass, r w is the density of pure distilled water, d 20 is the equivalent particle size of the rock mass, d 50 is the average particle size of the rock mass, m w is the viscosity of water, The present invention uses the porosity of the rock mass and the tortuosity determined by other relevant test parameters to accurately describe the bending and return characteristics of the fluid path, creating conditions for further determining the permeability coefficient of the rock mass.

[0017] Optionally, the determination of the permeability coefficient of the rock mass to be determined by the tortuosity, the porosity and the test parameters includes: calculating an expression for the permeability coefficient of the rock mass to be determined by the tortuosity, the porosity and the test parameters; and determining the permeability coefficient of the rock mass to be determined according to the result of the expression calculation. The present invention comprehensively considers the influence of the tortuosity, porosity and particle grading of the rock mass, and can comprehensively and accurately reflect the permeability performance of the fluid flowing in the rock mass, which is conducive to providing strong theoretical support and practical guidance for engineering fields such as surface water infiltration analysis, pollutant migration prediction, and oil and gas resource exploitation.

[0018] Optionally, the expression of the permeability coefficient is as follows:

[0019] ,

[0020] in, K is the permeability coefficient of rock and soil, is the tortuosity of the rock mass, is the porosity of the rock mass, r wis the density of pure distilled water, d 50 is the average particle size of the rock mass, m w is the viscosity of water, The present invention uses the permeability coefficient determined by the porosity, tortuosity and particle grading of the rock mass to accurately describe the flow characteristics of the fluid in the rock mass, which is conducive to scientifically evaluating the permeability of the rock mass and ensuring the safety and economy of the project.

[0021] In the second aspect, the present invention provides a system for determining the permeability coefficient of a rock and soil mass taking into account the influence of tortuosity, the system comprising an input device, a processor, an output device, and a memory, wherein the input device, the processor, the output device, and the memory are interconnected, wherein the memory is used to store a computer program, the computer program comprises program instructions, the processor is configured to call the program instructions, and the system uses the method for determining the permeability coefficient of a rock and soil mass taking into account the influence of tortuosity. The system for determining the permeability coefficient of a rock and soil mass taking into account the influence of tortuosity provided by the present invention has a high degree of integration, smooth information transmission between various components, can cope with permeability tests under different geological conditions, and can accurately reflect the water permeability of the rock and soil mass, which is conducive to a comprehensive understanding of the permeability characteristics of the rock and soil mass, and lays a solid foundation for formulating scientific and reasonable anti-seepage measures and foundation treatment plans.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention fully considers the comprehensive influence of rock mass particle grading, rock mass porosity and rock mass tortuosity on the rock mass permeability, and can better reflect the actual permeability of the rock mass.

[0024] 2. The process of determining the permeability coefficient of rock and soil mass in the present invention is relatively simple, and the cost is lower, which is more conducive to application in practical engineering technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A flow chart of a method for determining a rock mass permeability coefficient taking into account the influence of tortuosity according to an embodiment of the present invention;

[0026] Figure 2 Schematic diagram of the structure of a system for determining the permeability coefficient of a rock mass taking into account the influence of tortuosity according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The specific embodiments of the present invention will be described in detail below. It should be noted that the embodiments described herein are only for illustration and are not intended to limit the present invention. In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present invention. However, it is obvious to those of ordinary skill in the art that these specific details do not need to be adopted to implement the present invention. In other examples, in order to avoid confusing the present invention, known circuits, software or methods are not specifically described.

[0028] Throughout the specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "in one embodiment," "in an embodiment," "an example," or "an example" appearing in various places throughout the specification do not necessarily all refer to the same embodiment or example. In addition, particular features, structures, or characteristics may be combined in one or more embodiments or examples in any suitable combination and / or subcombination. In addition, it should be understood by those of ordinary skill in the art that the figures provided herein are for illustrative purposes and that the figures are not necessarily drawn to scale.

[0029] See also Figure 1 The embodiment of the present invention provides a method for determining the permeability coefficient of a rock mass taking into account the influence of tortuosity, the method comprising the following steps:

[0030] S1. Obtain the test parameters of the rock and soil mass to be determined.

[0031] The method of obtaining the test parameters of the rock and soil mass to be determined comprises the following steps:

[0032] S 11 , obtain the density of the rock and soil mass to be determined r .

[0033] Obtaining the density of the rock mass to be determined r In the process, a rock and soil density determination test was adopted, and the rock and soil density determination test included a water injection method, a sand injection method and a ring knife method.

[0034] In one embodiment, a water flooding test is used, and the water flooding test comprises the following steps:

[0035] First, a representative rock and soil test area is selected, and the ground at the rock and soil test area is leveled to remove loose soil layers on the surface to reduce test errors.

[0036] Furthermore, the diameter of the rock and soil test pit is determined according to the maximum particle size of the rock and soil sample and with reference to relevant standards.

[0037] Furthermore, pits are dug to take samples of the rock and soil mass, and the steps of the pit digging and sampling are as follows: a pit mouth contour line is drawn at a selected location according to a determined rock and soil test pit diameter; the pit is dug down to a required depth within the contour line, and the samples in the pit are loaded into a soil container while digging, while disturbing the soil layer at the bottom of the pit should be avoided; the mass of the rock and soil sample is accurately weighed using a scale, and the water content of the rock and soil sample is recorded for subsequent calculations.

[0038] Furthermore, a film bag is laid in the test pit, and the steps of laying the film bag are as follows: a ring of corresponding size is placed on the dug test pit and leveled with a level ruler; a plastic film bag with a volume larger than the test pit is laid flat in the pit, and the film is pressed around the ring to ensure that the film bag fits tightly against the edge of the test pit.

[0039] Furthermore, a water filling test is carried out on the test pit, and the steps of the water filling test are as follows: record the initial water level height in the water storage cylinder; turn on the water outlet pipe switch of the water storage cylinder, and slowly inject water into the plastic film bag; when there is no change in the water surface in the bag, record the water level height in the water storage cylinder.

[0040] Furthermore, the cross-sectional area of ​​the water storage cylinder and the water level height difference are multiplied to obtain the volume of the test pit.

[0041] Finally, the mass of the rock and soil sample is divided by the volume of the test pit to obtain the rock and soil density.

[0042] S 12 , obtain the mass water content of the rock and soil mass to be determined oh .

[0043] In obtaining the mass water content of the rock mass to be determined oh In the process, the methods adopted include but are not limited to drying.

[0044] In one embodiment, a drying method is used, and the drying method comprises the following steps:

[0045] First, a representative sample is taken from the rock mass and placed in a container of known mass.

[0046] Further, the container containing the sample is placed in a constant temperature oven, the temperature is set between 105°C and 110°C, and baking is continued until the sample mass is constant, which usually takes several hours, to ensure that the free water and hygroscopic water in the sample are completely evaporated.

[0047] Furthermore, after drying, the samples were quickly taken out and placed in a desiccator to cool down to prevent the samples from reabsorbing moisture from the air.

[0048] Finally, a high-precision balance is used to measure the total mass of the dried sample and the container, and the mass moisture content of the rock and soil is calculated.

[0049] S 13, obtain the specific gravity of the rock and soil mass to be determined G s .

[0050] Obtaining the specific gravity of the rock and soil mass to be determined G s In the process, the measurement methods used include but are not limited to the specific gravity bottle method and the siphon tube method.

[0051] In one embodiment, the pycnometer method and the siphon tube method are used simultaneously, and the implementation steps are as follows:

[0052] First, using the pycnometer method, the dried rock and soil samples were placed in a pycnometer, pure water was injected and boiled to exclude air, then the water temperature was stabilized in a constant temperature water bath, the total mass of the bottle, water and soil was accurately weighed, and a curve of the relationship between temperature and the total mass of bottle water was plotted.

[0053] Furthermore, the siphon method is used to place the rock and soil sample in a siphon, drain the water in the sample through siphon action, and measure the quality and temperature of the drained water. During this process, it is necessary to ensure that the water surface in the siphon is calm to obtain accurate readings.

[0054] Finally, the data obtained by the two methods are combined and the specific gravity of the rock and soil mass is calculated using the existing formula. This process requires extremely high instrument precision and operation accuracy to ensure the reliability of the measurement results.

[0055] S 14 , obtain the equivalent particle size of the rock and soil mass to be determined d 20 and average particle size d 50 .

[0056] In obtaining the equivalent particle size of the rock and soil mass to be determined d 20 and average particle size d 50 During the process, the tests used include but are not limited to particle analysis tests.

[0057] In one embodiment, a particle analysis test is used, which comprises the following steps:

[0058] First, the particle size analysis of the rock and soil samples is carried out through particle analysis test methods such as sieve analysis, density meter method or pipette method. The sieve analysis method is suitable for particles with a particle size greater than 0.075 mm, while the density meter method and pipette method are suitable for particles with a particle size less than 0.075 mm.

[0059] Furthermore, during the test, the mass data of each particle group is collected, and the percentage of each particle group in the total mass of the soil particles is calculated, and the mass data is used to draw a particle grading curve.

[0060] Furthermore, a particle gradation curve is drawn on semi-logarithmic coordinate paper with the mass percentage of soil with a particle size smaller than a certain diameter as the ordinate and the logarithm of the particle diameter as the abscissa. The curve intuitively reflects the distribution of each particle group in the rock and soil mass.

[0061] Finally, two points with ordinates of 20% and 50% are selected on the curve, and the abscissas corresponding to the two points are the equivalent particle size of the rock and soil mass, respectively. d 20 The average particle size d 50 .

[0062] S2. Determine the porosity of the rock mass to be determined using the test parameters.

[0063] Determining the porosity of the rock mass to be determined by using the test parameters comprises the following steps:

[0064] S 21 , using the test parameters, calculate the expression for the porosity of the rock and soil mass to be determined.

[0065] In one embodiment, the porosity of the rock mass to be determined is determined, and the determination process includes the following steps:

[0066] First, based on the existing query results, the expression of the porosity of the rock and soil mass is obtained, which is as follows:

[0067] ,

[0068] in, is the porosity of the rock mass, is the density of pure distilled water at 4°C, r is the density of the rock mass, oh is the mass water content of the rock mass, G s is the specific gravity of rock mass.

[0069] Furthermore, the test parameters obtained through multiple groups of test measurements are substituted into the expression of porosity for calculation.

[0070] Finally, multiple groups of calculation results of the expression are obtained.

[0071] S 22 , determine the porosity of the rock and soil mass to be determined based on the result calculated by the expression.

[0072] In the process of determining the porosity of the rock mass to be determined, it is necessary to perform data processing on the results of multiple groups of calculations of the expression.

[0073] In one embodiment, data processing is performed using spreadsheet software, and the data processing includes the following steps:

[0074] First, the results of the multiple sets of calculations are organized in a spreadsheet.

[0075] Furthermore, the largest and smallest data in the electronic table are removed.

[0076] Further, the AVERAGE function is called to calculate the average value of the remaining data in the spreadsheet.

[0077] Finally, the average value is determined as the porosity of the rock mass to be determined.

[0078] In another embodiment, data processing is performed using the MATLAB programming language, and the data processing comprises the following steps:

[0079] First, the results of the plurality of groups of calculations are input.

[0080] Furthermore, the largest and smallest data among the plurality of groups of calculated results are removed.

[0081] Furthermore, the sum function SUM is called to perform addition processing on the remaining data.

[0082] Furthermore, the result of the addition processing of the remaining data is divided by the number of the remaining data to obtain an average value of the remaining data.

[0083] Finally, the average value is determined as the porosity of the rock mass to be determined.

[0084] S3. Determine the tortuosity of the rock mass to be determined based on the porosity and the test parameters.

[0085] Determining the tortuosity of the rock mass to be determined according to the porosity and the test parameters comprises the following steps:

[0086] S 31 , calculating the expression of the tortuosity of the rock and soil mass to be determined according to the porosity and the test parameters;

[0087] In one embodiment, the tortuosity of the rock mass to be determined is determined, and the determination process includes the following steps:

[0088] First, based on the existing query results, the expression of rock and soil tortuosity is obtained, which is as follows:

[0089] ,

[0090] in, is the tortuosity of the rock mass, is the porosity of the rock mass, r w is the density of pure distilled water, d 20 is the equivalent particle size of the rock mass, d 50 is the average particle size of the rock mass, m w is the viscosity of water, is the acceleration due to gravity.

[0091] Furthermore, the obtained multiple groups of porosity and test parameters are substituted into the tortuosity expression for calculation.

[0092] Finally, multiple groups of calculation results of the expression are obtained.

[0093] S 32 , determining the tortuosity of the rock and soil mass to be determined according to the result calculated by the expression.

[0094] In the process of determining the tortuosity of the rock mass to be determined, it is necessary to perform data processing on the results of multiple groups of calculations of the expression.

[0095] In one embodiment, data processing is performed using spreadsheet software, and the data processing includes the following steps:

[0096] First, the results of the multiple sets of calculations are organized in a spreadsheet.

[0097] Furthermore, the largest and smallest data in the electronic table are removed.

[0098] Further, the AVERAGE function is called to calculate the average value of the remaining data in the spreadsheet.

[0099] Finally, the average value is determined as the tortuosity of the rock mass to be determined.

[0100] In another embodiment, data processing is performed using the MATLAB programming language, and the data processing comprises the following steps:

[0101] First, the results of the plurality of groups of calculations are input.

[0102] Furthermore, the largest and smallest data among the plurality of groups of calculated results are removed.

[0103] Furthermore, the sum function SUM is called to perform addition processing on the remaining data.

[0104] Furthermore, the result of the addition processing of the remaining data is divided by the number of the remaining data to obtain an average value of the remaining data.

[0105] Finally, the average value is determined as the tortuosity of the rock mass to be determined.

[0106] S4. Determine the permeability coefficient of the rock mass to be determined through the tortuosity, the porosity and the test parameters.

[0107] Determining the permeability coefficient of the rock mass to be determined by the tortuosity, the porosity and the test parameters comprises the following steps:

[0108] S 41 , calculating the expression of the permeability coefficient of the rock mass to be determined through the tortuosity, the porosity and the test parameters.

[0109] In a first embodiment, the permeability coefficient of the rock mass to be determined is analyzed, and the analysis includes the following steps:

[0110] First, a rock and soil permeability coefficient model is constructed. The permeability coefficient model construction process is as follows:

[0111] By querying existing results, the permeability of rock and soil is obtained k Tortuosity t The relational expression is as follows:

[0112] ,

[0113] in, k is the rock permeability, is the rock mass tortuosity, D f is the dimensionless fractal dimension of the pore space in rock and soil mass, l max is the maximum diameter of the pores in the rock mass, l max , porosity f and average particle size d 50 Satisfies the following expression:

[0114] ,

[0115] Furthermore, the fractal dimension of the pores in the rock mass D f It is expressed as:

[0116] ,

[0117] in, l min It is the minimum diameter of pores in rock and soil.

[0118] Furthermore, the maximum diameter of the pores in the rock mass is l max and the minimum diameter of the pores in the rock mass l min Satisfies the following expression:

[0119] ,

[0120] in, d + The average particle size of rock mass d 50 With minimum particle size d min The ratio of

[0121] ,

[0122] Furthermore, the microporosity of rock and soil f c Porosity f Satisfies the following relationship:

[0123] ,

[0124] Furthermore, the permeability of rock and soil can be derived according to the above formula: k The expression that satisfies is:

[0125] ,

[0126] Furthermore, the minimum particle size of the rock mass d min Satisfies the following relationship:

[0127] ,

[0128] in, d m1 The minimum particle size of the sieve for rock and soil particle screening test is usually 7.50×10 -5 m.

[0129] Furthermore, due to the permeability of the rock mass k and permeability coefficient K The following relationship is satisfied:

[0130] ,

[0131] in, m w is the viscosity of water, r w is the density of water, take 1000kg / m 3 , is the acceleration due to gravity, take 9.8m / s 2 .

[0132] Therefore, the permeability coefficient of rock and soil is K Satisfies the following expression:

[0133] ,

[0134] Furthermore, the results of the density test, water content test and specific gravity test are substituted into the porosity expression to calculate the porosity of the rock and soil mass. f =24.00%.

[0135] Furthermore, the equivalent particle size of the rock and soil mass is obtained through particle analysis test. d 20 =5.80×10 -4 m and average particle size d 50 =9.44×10 -3 m.

[0136] Furthermore, the viscosity of water was obtained by consulting the existing research results on the viscosity standard of water. m w= 1.01×10 - 3 Pa·s.

[0137] Furthermore, the above-obtained relevant parameters are substituted into the tortuosity expression to calculate and obtain the rock and soil tortuosity t =4.36.

[0138] Furthermore, the relevant parameters obtained above are substituted into the expression corresponding to the rock and soil permeability model for calculation.

[0139] Furthermore, the permeability coefficient of the rock mass obtained by the above expression is K= 1.34×10 -4 m / s and the permeability coefficient obtained from the test K= 1.22×10 -4 m / s for comparison.

[0140] Finally, the results show that the error between the theoretical calculation result and the measurement result is extremely small. Therefore, the permeability coefficient of rock and soil can be determined quickly, reasonably, effectively and accurately through the present invention.

[0141] In the second embodiment, the permeability model of the rock mass to be determined is analyzed for the second time, and the analysis includes the following steps:

[0142] First, a rock and soil permeability model is constructed, and the model satisfies the same expression as the first embodiment.

[0143] Furthermore, the results of the density test, water content test and specific gravity test are substituted into the porosity expression to calculate the porosity of the rock and soil mass. f =18.50%.

[0144] Furthermore, the equivalent particle size of the rock and soil mass is obtained through particle analysis test. d 20 =1.23×10 -3 m and average particle size d 50 =6.26×10 -3 m.

[0145] Furthermore, the viscosity of water is obtained by consulting the existing water viscosity standards. m w= 1.01×10 -3 Pa·s.

[0146] Furthermore, the above-obtained relevant parameters are substituted into the tortuosity expression to calculate and obtain the rock and soil tortuosity t =2.30.

[0147] Furthermore, the relevant parameters obtained above are substituted into the permeability coefficient expression of the rock and soil mass to be determined for calculation.

[0148] Furthermore, the permeability coefficient of the rock mass obtained by the above expression is K= 1.66×10 -4 m / s and the permeability coefficient obtained from the test K= 1.51×10 -4 m / s for comparison.

[0149] Finally, the results show that the error between the theoretical calculation result and the measurement result is extremely small. Therefore, the permeability coefficient of rock and soil can be determined quickly, reasonably, effectively and accurately through the present invention.

[0150] In a third embodiment, a third analysis is performed on the permeability coefficient of the rock mass to be determined, and the analysis includes the following steps:

[0151] First, an expression for the permeability coefficient of the rock mass is obtained, which is the same as that in the first embodiment.

[0152] Furthermore, the results of the density test, water content test and specific gravity test are substituted into the porosity expression to calculate the porosity of the rock and soil mass. f =27.00%.

[0153] Furthermore, the equivalent particle size of the rock and soil mass is obtained through particle analysis test. d20 =5.80×10 -4 m and average particle size d 50 =9.44×10 -3 m.

[0154] Furthermore, the viscosity of water is obtained by consulting the existing water viscosity standards. m w= 1.01×10 -3 Pa·s.

[0155] Furthermore, the above-obtained relevant parameters are substituted into the tortuosity expression to calculate and obtain the rock and soil tortuosity t =4.10.

[0156] Furthermore, the relevant parameters obtained above are substituted into the expression corresponding to the rock and soil permeability model for calculation.

[0157] Furthermore, the permeability coefficient of the rock mass obtained by the above expression is K= 1.97×10 -4 m / s and the permeability coefficient obtained from the test K= 1.80×10 -4 m / s for comparison.

[0158] Finally, the results show that the error between the theoretical calculation result and the measurement result is extremely small. Therefore, the present invention can quickly, reasonably, effectively and accurately determine the permeability coefficient of rock and soil.

[0159] Only three embodiments are given above. The actual implementation process includes more embodiments for solving the permeability coefficient of rock and soil, and obtains calculation results of multiple groups of the above expressions.

[0160] S 42 , determine the permeability coefficient of the rock and soil mass to be determined based on the result calculated by the expression.

[0161] In the process of determining the permeability coefficient of the rock and soil body to be determined, it is necessary to perform data processing on the results of multiple groups of calculations of the expression.

[0162] In one embodiment, data processing is performed using spreadsheet software, and the data processing includes the following steps:

[0163] First, the results of the multiple sets of calculations are organized in a spreadsheet.

[0164] Furthermore, the largest and smallest data in the electronic table are removed.

[0165] Further, the AVERAGE function is called to calculate the average value of the remaining data in the spreadsheet.

[0166] Finally, the average value is determined as the permeability coefficient of the rock mass to be determined.

[0167] In another embodiment, data processing is performed using the MATLAB programming language, and the data processing comprises the following steps:

[0168] First, the results of the plurality of groups of calculations are input.

[0169] Furthermore, the largest and smallest data among the plurality of groups of calculated results are removed.

[0170] Furthermore, the sum function SUM is called to perform addition processing on the remaining data.

[0171] Furthermore, the result of the addition processing of the remaining data is divided by the number of the remaining data to obtain an average value of the remaining data.

[0172] Finally, the average value is determined as the permeability coefficient of the rock mass to be determined.

[0173] The permeability coefficients obtained by solving the above two embodiments are the same, which is K= 1.78×10 -4 m / s.

[0174] See also Figure 2 , Figure 2 The present invention is a schematic diagram of a system for determining the permeability coefficient of a rock and soil mass taking into account the influence of tortuosity in an embodiment of the present invention. The system includes an input device, a processor, an output device, and a memory, wherein the input device, the processor, the output device, and the memory are interconnected, and the system uses the method for determining the permeability coefficient of a rock and soil mass taking into account the influence of tortuosity.

[0175] Furthermore, the input device adopts a touch screen, and the touch screen is mainly used to input parameters obtained through density test, moisture content test, specific gravity test and particle analysis test.

[0176] Furthermore, the processor has built-in parameter algorithms, including a porosity algorithm, a tortuosity algorithm, and a permeability coefficient algorithm, for performing expression calculations on data input by an input device.

[0177] Furthermore, the output device uses a display screen, which is mainly used to display the permeability coefficient of the rock and soil mass obtained by calculation by the processor.

[0178] Furthermore, the memory adopts a high-speed solid-state hard disk to store the original data input by the input device and the result data processed by the processor. The memory has the characteristics of fast reading and writing speed, large capacity and high reliability, and can meet the needs of large data storage.

[0179] Based on the above embodiments, it can be concluded that the method and system for determining the permeability coefficient of rock and soil mass proposed in the present invention have the advantages of being simple, fast and reliable, and have high practical value and promotion value in the field of environmental protection and ecological restoration technology.

[0180] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A method for determining the permeability coefficient of rock and soil mass considering the influence of tortuosity, characterized in that: The method comprises the following steps: Obtaining test parameters of the rock and soil mass to be determined; Determine the porosity of the rock mass to be determined by using the test parameters; According to the porosity and the test parameters, the tortuosity of the rock mass to be determined is determined, and the expression of the tortuosity is as follows: in, is the tortuosity of the rock mass, is the porosity of the rock mass, is the density of pure distilled water, is the equivalent particle size of the rock mass, is the average particle size of the rock mass, is the viscosity of water, is the acceleration due to gravity; The permeability coefficient of the rock mass to be determined is determined by the tortuosity, the porosity and the test parameters. The expression of the permeability coefficient is as follows: in, is the permeability coefficient of rock and soil, is the tortuosity of the rock mass, is the porosity of the rock mass, is the density of pure distilled water, is the average particle size of the rock mass, is the viscosity of water, is the acceleration due to gravity.

2. A method for determining the permeability coefficient of rock and soil mass considering the influence of tortuosity according to claim 1, characterized in that: The method of obtaining the test parameters of the rock and soil mass to be determined includes: Get the density of the rock mass to be determined ; Obtain the mass water content of the rock and soil to be determined ; Obtain the specific gravity of the rock and soil mass to be determined .

3. The method for determining the permeability coefficient of rock and soil mass considering the influence of tortuosity according to claim 1, characterized in that: The obtaining of the test parameters of the rock and soil mass to be determined also includes: Obtain the particle grading parameters of the rock mass to be determined, the particle grading parameters include the equivalent particle size and average particle size .

4. A method for determining the permeability coefficient of rock and soil mass considering the influence of tortuosity according to claim 1, characterized in that: Determining the porosity of the rock mass to be determined by using the test parameters includes: Using the test parameters, calculating the expression for the porosity of the rock and soil mass to be determined; The porosity of the rock mass to be determined is determined according to the result calculated by the expression.

5. A method for determining the permeability coefficient of rock and soil mass considering the influence of tortuosity according to claim 4, characterized in that: The expression of porosity is as follows: in, is the porosity of the rock mass, For pure distilled water The density at is the density of the rock mass, is the mass water content of the rock mass, is the specific gravity of rock mass.

6. The method for determining the permeability coefficient of rock and soil mass considering the influence of tortuosity according to claim 1, characterized in that: Determining the tortuosity of the rock mass to be determined according to the porosity and the test parameters includes: Calculating the expression of the tortuosity of the rock and soil mass to be determined according to the porosity and the test parameters; The tortuosity of the rock and soil mass to be determined is determined according to the result calculated by the expression.

7. The method for determining the permeability coefficient of rock and soil mass considering the influence of tortuosity according to claim 1, characterized in that: Determining the permeability coefficient of the rock mass to be determined by using the tortuosity, the porosity and the test parameters includes: Calculating the expression of the permeability coefficient of the rock and soil mass to be determined by using the tortuosity, the porosity and the test parameters; The permeability coefficient of the rock and soil mass to be determined is determined according to the result calculated by the expression.

8. A system for determining the permeability coefficient of a rock and soil mass taking into account the influence of tortuosity, the system using the method for determining the permeability coefficient of a rock and soil mass taking into account the influence of tortuosity according to any one of claims 1 to 7, characterized in that: The system includes an input device, a processor, an output device and a memory, wherein the input device, the processor, the output device and the memory are connected to each other, wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is configured to call the program instructions.

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