节理岩体正交各向异性等效强度参数研究

将节理裂隙视为岩体的损伤,利用岩体裂隙网络模拟技术、损伤力学和节理张量理论对等效抗剪强度参数(即黏聚力和摩擦系数)进行了研究。在岩体损伤力学研究成果的基础上,研究了包含多组节理裂隙的岩体在空间任意截面上损伤变量的近似计算方法;以损伤变量作为加权系数,将岩块和结构面抗剪强度参数的加权平均值作为岩体等效强度参数;根据岩体在各空间截面上的等效抗剪强度参数计算成果,将岩体抗剪强度参数等效为正交各向异性变化的抗剪强度参数;编制相应的计算程序,通过计算实例验证了研究成果和计算程序的正确性。

Study on orthotropic equivalent strength parameters of jointed rock mass

The joints and cracks of rock mass were considered as damage.The simulation method of joint network,damage mechanics and the theory of joint tensor were applied to analysis of equivalent shear strength parameters(i.e.,cohesion and friction factor).On the basis of analysis conclusion of rock mass damage mechanics,the approximate evaluation method of the damage variable in any spacial section was proposed.Taking the damage varible as weighted factor,the equivalent shear strength parameters of any spacial section were calculated in a weighted fashion with the shear strength parameters of intact rock and joints.The shear strength parameters of rock mass were fitted as orthotropic equivalent shear strength parameters by use of the spacial equivalent shear strength parameters.The computation codes of orthotropic equivalent shear strength parameters were developed and the example verification was carried out to test the rationality of the analytic results and the codes.