岩体力学参数敏感性正交数值模拟试验

Orthogonal Numerical Simulation on Sensitivity of Rock Mechanical Parameters

采用正交数值模拟试验方法研究了岩体力学参数对巷道围岩变形与破坏的影响.选择弹性模量(弹模)、泊松比、黏聚力、内摩擦角、抗拉强度、剪胀角等6个因素、5个水平的正交试验方法进行了相关的数值模拟试验.试验结果表明:黏聚力是影响巷道变形与破坏最敏感也是最重要的参数.随着黏聚力的加大,巷道围岩表面移近量及屈服范围均显著减小;内摩擦角对巷道围岩屈服范围有着明显的影响;弹模对巷道围岩表面移近量有着明显影响;泊松比、抗拉强度和剪胀角的影响相对较小.

In this paper, the effect of mechanical parameters of rock mass on roadway deformation and failure is analyzed by using orthogonal numerical simulation experiment which has six factors （Young＇s modulus, Poisson＇ s ratio, cohesion, internal angle of friction, tensile strength, dilation angle） with each factor having five levels. The experimental results show that cohesion is the most important and sensitive factor affecting the deformation and failure of roadway. As the cohesion increases, both the surface displacement and the plastic yield area decrease. Young＇s modulus have a significant effect on deformation, while internal friction angle on plastic yield area. But the Poisson＇s ratio, tension strength, and dilation angle have less effect on them.