基于改进刚体弹簧方法的开挖损伤演化分析

doi:10.13722/j.cnki.jrme.2015.0978

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Abstract This paper describes the numerical modeling of excavation damaged zone(EDZ) in surrounding rocks with embedded structural planes. A modified rigid body spring method(RBSM) was proposed to simulate the initiation and propagation of micro cracks. Both the tensile and shear failures were considered by introducing a failure criterion which combines the Hoek-Brown criterion and the tensile strength criterion. The rock material was represented by an equivalent discrete assembly of rigid blocks based on a degradation Voronoi mesh. A simple case was employed to demonstrate the validity of the proposed model，and the simulation results were compared with ones from the finite element method. At last，the EDZ of the diversion tunnel in the Jinping II hydropower project was studied using the proposed model with the emphasis on the NWW joint and some suggestions were given on the reinforcement project. The simulated EDZs were generally in agreement with the in-situ observation.

Key words： rock mechanics crack propagation structural planes excavation damaged zone(EDZ) rigid body spring method(RBSM)

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2015.0978 OR http://www.rockmech.org/EN/Y2015/V34/I10/1959

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