考虑工程扰动和地质条件的巷帮极限平衡区分析

发布时间：2018-10-13 15:04

【摘要】：基于Hoek-Brown和Mohr-Coulomb强度准则,建立了与工程扰动程度D、岩体地质强度指标GSI相关的非线性岩体强度参数(内摩擦角、黏聚力)表达式,分析了参数D,GSI对内摩擦角和黏聚力的影响变化规律。以巷帮煤岩体处于完整与破碎两种极端条件为例,基于提出的非线性M-C准则,建立了与参数D,GSI有关的巷帮滑移面正应力和极限平衡区宽度方程式,并研究参数D,GSI对极限平衡区的影响。结果表明:参数D越小、GSI越大时,内摩擦角与黏聚力越大,说明岩体完整性越好,非线性岩体强度参数值越大;巷帮滑移面正应力随参数D的增大而减小,随参数GSI的增大而增大;极限平衡区宽度随参数D的增大而增大,随参数GSI的增大而减小。最后,通过工程实例分析,验证了研究成果的合理性。
[Abstract]:Based on Hoek-Brown and Mohr-Coulomb strength criterion, the expressions of nonlinear rock mass strength parameters (internal friction angle, cohesion force) related to engineering disturbance degree D and rock mass geological strength index GSI are established. The influence of the parameter DGSI on the internal friction angle and cohesion is analyzed. Taking the two extreme conditions of coal and rock mass in the roadway wall as an example, based on the nonlinear M-C criterion proposed, the normal stress equations of the slip plane and the width of the limit equilibrium zone are established, which are related to the parameter DGSI. The influence of the parameter DGSI on the limit equilibrium region is also studied. The results show that the smaller the parameter D, the greater the GSI, the greater the internal friction angle and cohesion force, the better the integrity of rock mass, the greater the strength parameter value of nonlinear rock mass, and the lower the normal stress of roadway slip plane decreases with the increase of parameter D. The width of limit equilibrium region increases with the increase of parameter D and decreases with the increase of parameter GSI. Finally, the rationality of the research results is verified by the analysis of engineering examples.
【作者单位】：四川大学水力学与山区河流开发保护国家重点实验室;四川大学水利水电学院;河南工程学院安全工程学院;北方民族大学化学与化学工程学院;
【基金】：国家自然科学基金煤炭联合基金重点资助项目(51134018);国家自然科学基金地区科学基金资助项目(51369001)
【分类号】：TD322

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