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《Journal of Yangtze River Scientific Research Institute》 2011-06
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Risk Analysis for Tunnel Rockburst Based on Fracture Mechanics and Stochastic FEM

ZHAO Yan-xi,LI Hao(Jiangsu Provincial Communication Planning and Designing Institute Co.,Ltd.,Nanjing 210005,China)  
Stress-strength ratio model is usually applied to rockburst prediction in China and abroad,but uncertainties in engineering are not taken into account in this method.A fracture mechanics model of rockburst mechanism is proposed in this paper.This model is based on the assumption that rockburst is caused by microcracks which parallel to the free surface.These microcracks will fracture,extend,and mutually connect under external load.Then visible macroscopic crack is formed and finally rockburst happens.Furthermore,a rockburst risk probability model is proposed using reliability theory and stochastic FEM method based on Lamination spallation buckling model.The model was applied to engineering project calculation and the result manifested its rationality.
【Fund】: 国家自然科学基金项目(50909038);; 国家科技支撑计划项目(2006BAB04A06)
【CateGory Index】: U451.2
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