隧洞围岩多轴强度安全系数的计算方法研究

Safety factor method is a well-established and widely used at present still the quantitative evaluation methods. The paper lining in a circular tunnel as an example, the calculation based on the Mohr-Coulomb strength criteria, and the definition of strength reduction factor and safe distance factor, in a complex state of stress the safety of the surrounding rock, and thus judged the three-dimensional surrounding rock of tunnel potentially dangerous area, with the elastic-plastic analysis of the comparison, the coefficient obtained safe distance factor from the more reasonable conclusion.