Surrounding Rock Stability Analysis and Rock Burst Prediction of Underground Cavity in High In Situ Stress

Abstract:

Based on Sidoroff isotropic elastic damage model, the damage deterioration constitutive equation was constructed for rigid and brittle rock mass. The excavation numerical simulation of a diversion tunnel with large section in Jinping hydro station was carried on. The displacement and stress evolution was analyzed considering stress transfer and dissipation of the tunnel surrounding rock mass. The stability evaluation parameters were put forward such as stress relaxation coefficient of surrounding rock mass, safety factor, the scale and distribution of plastic region of surrounding rock mass. The rock burst predication index was presented in viewpoint of energy such as sub-range statistic average energy release rate and sub-range statistic failure volume. The excavation methods for the diversion tunnel with large section were evaluated with multi criteria and the guideline for large section cavity in high in-situ stress was summarized.

• Periodical: Advanced Materials Research (Volumes 594-597)
• Pages: 1174-1181
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.594-597.1174
• Online since: November 2012
• Authors: Hai Yan Zang*, Guang Di Wang
• Keywords: Damage Deterioration Model, High In Situ Stress, Numerical Simulation, Relax Characteristics, Rock Burst

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