Study On Seepage Stochastic Simulation Method Based On Full Coupling And Fracture Combination

The fractured rock mass is a complex medium frequently encountered in various projects.The mechanical parameters of the rock mass medium are highly variable,and it is not suitable to use the deterministic method to study the seepage problem of the rock mass.Instead,the stochastic finite element method should be used.The coupling field with random parameters is numerically simulated.The spatial variability of parameters can reflect the distribution of physical quantities such as head,seepage velocity,stress and displacement at each point in the coupling field through numerical calculation results.This paper introduces the analysis method of the seepage characteristics of the combined fractured rock mass and the relationship between the permeability and the stress of the combined fracture,and applies it to the program,and obtains a program scheme that can solve the combined fracture fluid-solid coupling problem;studies the full fluid-solid coupling The perturbation stochastic finite element method of the problem,the corresponding program was developed,and the reliability of the program was verified through a calculation example;at the end of this paper,the calculation scale was also expanded,and the Suntuan Coal Mine was used as the engineering background to establish the roadway surrounding rock fissure model.The mean value and random law of each physical quantity under the condition of variation based on permeability coefficient and stiffness coefficient are discussed,and the conclusions are as follows:(1)The seepage field has a non-negligible influence on the stress field,and weakens the stress components and displacements to a certain extent.The surface deformation of the roadway when the seepage field is considered is 32% lower than that without the seepage field.(2)The stress field has little effect on the water head distribution of the seepage field,but has a greater impact on the hydraulic gradient at each point in the seepage field,and the increase in the position of the largest hydraulic gradient reaches about23%;(3)When only the stress field is random alone: the stress variation degree near the roadway and the crack is relatively large,and the x-direction stress variation ratio in the middle of the crack is the largest,reaching more than 8%,indicating that it is greatly affected by randomness;When only the seepage field is random alone: the variability of the water head is very small,and the variability of the hydraulic gradient is large.Among them,the x-direction hydraulic gradient in the middle of the fracture has the largest variation ratio,which is about 6%,indicating that the spatial variability of the permeability coefficient is only Have a greater impact on the hydraulic gradient.Therefore,in the actual roadway excavation process,attention should be paid to the influence of randomness.This paper includes 42 diagrams,12 tables and 90 references.