【摘要】 岩土体强度具有明显的非线性特性,采用非线性的岩体强度准则对岩质边坡的稳定性评价具有重要的应用价值。以Hoek-Brown破坏准则描述岩体的强度特性,采用等效切线法获得该破坏准则的等效粘聚力和等效内摩擦角,以用于岩质边坡稳定性计算。此外,采用地震作用系数考虑水平地震力的影响,推导出二级岩质边坡的稳定性系数表达式和安全系数方程。在此基础上,运用数值优化方法,计算最优的临界解。通过对比分析,第一级边坡坡角越小,地震作用系数增大使边坡稳定性降低的程度越明显。综合考虑边坡安全性和工程量,优化了台阶边坡的设计方案,取得良好的应用效果。更多还原

【Abstract】 There is an obvious nonlinear character on rock mass strength and it is of great significance in applications to evaluate the stability of rock mass slope by nonlinear strength criterion. Equivalent cohesion and internal friction angle calculated by equivalent tangent method were used for the calculation of stability of rock mass slope,whose strength was expressed by Hoek-Brown failure criterion. Expressions of stability coefficient and safety factor were conducted under the consideration of horizontal seismic force coefficient. Based on the works above,optimal solutions of critical heights were obtained by numerical optimization finally. Conclusions can be drawn that the smaller the slope angle was,the more significant the decreasing tendency of the slope stability along with the increase of horizontal seismic force coefficient. The design proposal of bench-shape should be made based on the comprehensive consideration of the slope safety and work amounts,and the results showed that the slope should shaped multistaged based on the original topography.更多还原