基于正交设计的不同岩石力学参数下深部巷道变形及破坏特征

Deformation and Failure Characteristics of Deep Roadway Under Different Rock Mechanical Parameters Based on Orthogonal Design

为了研究不同岩石力学参数对深部巷道围岩稳定性的影响,选取与巷道围岩稳定性密切相关的弹性模量、抗拉强度、粘聚力、内摩擦角等4个力学参数,采用正交设计方法设计数值模拟计算分析,结果表明:不同因素组合下,顶板塑性区范围和变形量都要大于相同条件下底板和侧帮围岩;敏感性分析发现,内摩擦角、粘聚力对巷道围岩塑性区及变形量的影响程度较高,弹性模量和抗拉强度则相对较弱;同时,应用MATLAB软件拟合得到巷道围岩塑性区范围及变形量与各因素间的回归公式。

In order tO explore the influence of different me- chanical parameters on the stability of surrounding rock at deep roadway, 4 mechanical parameters closely related to the stability of surrounding rock were selected, including elastic modulus, tensile strength, cohesion and internal friction an- gle. Numerical simulation was carried out by orthogonal de- sign. The results showed that under the combination of dif- ferent factors, the plastic zone and deformation of roof were larger than that of bottom plate and side wall in the same conditions. The sensitivity analysis found that internal fric- tion angle and cohesion had slightly great influences on the plastic zone and deformation of surrounding rock, but elastic modulus and tensile strength had weak influences. Mean- while, the plastic zone and deformation of surrounding rock were obtained by MATLAB software, as well as their re-gression formulas with mechanical parameters.