Numerical algorithm for simulating self-adaptive expansion of cracks

Abstract

The invention discloses a numerical algorithm for simulating self-adaptive expansion of cracks, which comprises the following steps of: S1, determining a solving region according to a target problem of crack expansion, taking a region in which the cracks are not expanded in the solving region as a continuous solving region, and carrying out solving calculation on the crack expansion in the continuous solving region by utilizing a clone point technology; s2, the maximum tensile stress and the Mohr-Coulomb composite strength criterion act on the grids in the continuous solution domain to serve as the basis of crack initiation and the extension direction, and grid reconstruction is conducted in the crack initiation area; and S3, inheriting original grid information into the newly generated grid by adopting a space mapping technology, setting a contact surface at the newly added crack surface, and performing mechanical characteristic description of the crack surface by adding normal and tangential springs in the contact surface. According to the method, the dynamic expansion process simulation of the crack is realized, the problem that the crack expansion path is limited by the initial grid topology is solved, and the accurate simulation of the crack expansion direction is realized.

Description

technical field [0001] The invention relates to the technical field of geological crack expansion, in particular to a numerical algorithm for simulating adaptive crack expansion. Background technique [0002] Geological bodies are characterized by discontinuity and inhomogeneity. At present, China is in a period of great infrastructure development. Water conservancy, transportation, mining, national defense and other projects all need to deal with geological bodies. Due to human interference, the stress field inside the geological body is redistributed, resulting in the generation of secondary cracks. Engineering practice shows that the occurrence of many geological disasters is caused by the initiation, expansion and penetration of cracks inside the rock mass. Therefore, it is of great guiding significance for engineering practice to study the propagation mechanism of fractures in geological bodies. [0003] With the rapid development of computer technology, it is an effe...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a numerical algorithm for simulating the adaptive expansion of cracks, so as to solve the technical problem in the prior art that the damage only occurs on the block interface, which is greatly affected by the initial grid, and cannot accurately describe the cracks.

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