Engineering rock mass fracture degradation numerical simulation method based on continuous medium

Abstract

The invention discloses an engineering rock mass fracture degradation numerical simulation method based on a continuous medium. The engineering rock mass fracture degradation numerical simulation method comprises the following steps: establishing an engineering object numerical model; selecting a constitutive model of a rock mass in the engineering object numerical model, and endowing the constitutive model with corresponding mechanical parameters; setting an engineering object numerical model boundary condition; excavating the engineering object numerical model, and executing engineering rock mass fracture degradation iterative computation; and obtaining a simulation result, and carrying out research and analysis on a research object. On the basis of keeping original numerical iterative computation, the engineering rock mass fracture degradation numerical simulation method adds the dynamic development of a fracture due to excavation disturbance and caused surrounding rock Young modulus degradation in a stress redistribution process in the surrounding rock, a degraded residual Young modulus can be obtained by data inversion obtained by field observation or theoretical empirical estimation, and a numerical simulation process based on the continuous medium can be more reasonable and precise so as to make a numerical simulation result reliable and true.

Description

technical field [0001] The invention relates to the fields of rock mechanics and engineering and mining engineering, in particular to the field of numerical simulation technology for stability analysis and control design optimization of surrounding rocks of fractured rock masses. Background technique [0002] In geotechnical engineering tunnels, mining, hydropower, nuclear power and other fields, especially in underground engineering, artificial excavation disturbances break the original stress state of the surrounding rock and cause stress redistribution in the surrounding rock. This process makes the original macroscopic and microscopic cracks in the rock develop, expand and even penetrate each other, which deteriorates the mechanical properties of the surrounding rock and undergoes deformation and damage to varying degrees, thereby affecting the stability of the surrounding rock. The stability control of surrounding rock is an important research topic in the field of geot...

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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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