基于Hoek-Brown非线性极限平衡法的边坡安全系数

摘要

为了建立Hoek-Brown非线性准则下边坡安全系数计算的极限平衡法,通过理论推导与Hoek-Brown参数相对应的等效黏结力和内摩擦角,得到Hoek-Brown准则中简化Bishop极限平衡法计算边坡的安全系数公式,并分析Hoek-Brown参数对于边坡安全系数的影响,研究结果表明:岩体材料的等效黏结力与弱化因子D呈线性关系,而与岩体地质强度指标IGS、完整岩石单轴抗压强度σci和完整岩石参数mi呈非线性关系；等效内摩擦角与各Hoek-Brown参数均呈非线性关系.随D的增大,边坡安全系数F线性减小；随IGS的增大,F非线性增大；当σci较小时,F和σci关系呈现一定非线性特征,当σci较大时,二者呈现线性关系特征；F随mi的增大,呈先减小后增大的趋势.%In order to establish the limit equilibrium method of the safety factor calculation for slope stability,based on the nonlinear Hoek-Brown criterion,the Hoek-Brown parameters corresponding to the equivalent cohesion and internal friction angle were obtained through theoretical deduction,and the safety factor of the slope by simplify Bishop limit equilibrium method based on Hoek-Brown criterion was obtained.The analysis of effect of Hoek-Brown parameters on the safety factor of slope was carried out.The results show that the material equivalent cohesion and damage factor have a linear relationship,and the equivalent friction angle with the rock mass,geological strength index IGs,intact rock uniaxial compressive strength σci and integrity mi of rock parameters shows a nonlinear relationship.With the increase of D,the slope safety factor F decreases linearly; as IGs increases,F increases nonlinearly.When σci is small,F and σci shows certain nonlinear characteristic,when σci is large,they show linear relationship characteristics.As mi increases,F decreases first and then increases.