A Numerical Simulation Method of Engineering Rock Mass Fracture Deterioration Based on Continuum

Abstract

The invention discloses a numerical simulation method for cracking and deterioration of engineering rock mass based on a continuum, which includes the steps of establishing a numerical model of an engineering object, selecting a constitutive model of the rock mass in the numerical model of the engineering object, and assigning corresponding mechanical parameters to the constitutive model In the step of setting the boundary conditions of the numerical model of the engineering object, the numerical model of the engineering object is excavated and the iterative calculation of the cracking and degradation of the engineering rock mass is performed to obtain the simulation results and conduct research and analysis according to the research object. On the basis of retaining the original numerical iterative calculation, the present invention adds the dynamic development of cracks disturbed by excavation during the process of stress redistribution in the surrounding rock and the deterioration of the Young's modulus of the surrounding rock, which is reflected by the data obtained from field observation or theoretical experience. Evolving the residual Young's modulus after degradation can make the numerical simulation process based on continuum medium more reasonable and rigorous, and then make the numerical simulation results more realistic and reliable.

Description

technical field [0001] The invention relates to the fields of rock mechanics, engineering and mining engineering, in particular to the technical field of numerical simulation of stability analysis and control design optimization of surrounding rock of a fractured rock mass. Background technique [0002] In the fields of tunnels, mining, hydropower, nuclear power and other fields of geotechnical engineering, especially in underground engineering, the disturbance of artificial excavation breaks the original stress state of the surrounding rock and causes the redistribution of stress in the surrounding rock. This process makes the original macroscopic and microscopic fractures in the rock develop, expand and even penetrate each other, which deteriorates the mechanical properties of the surrounding rock and causes different degrees of deformation and damage, thus affecting the stability of the surrounding rock. The stability control of surrounding rock is an important research t...

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Problems solved by technology

[0005] The finite element method can flexibly divide irregular grid units to simulate simulation objects of different shapes, and has wide applicability and high calculation accuracy. There are limitations in the simulation of complex engineering with scale and media

[0006] 2. Finite difference method

The mechanical parameters of the joints in the discrete element method need to be defined by the user, but these mechanical parameters are difficult to estimate accurately. Improper selection of the joint parameters will greatly affect the calculation results of the discrete element method, and it is impossible to accurately simulate and simulate the actual engineering

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