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以位于浙江省三门县蛇蟠岛清风洞古代凝灰岩采石场中的某组结构面(编号分别为J1～J4)为研究对象,利用反分析方法得到了结构面的长期抗剪强度参数:凝聚力c=0.078 MPa,内摩擦角φ=15.76°。反分析的具体步骤如下:①假设结构面J1～J4符合摩尔-库仑准则,且岩石为均质弹性和各向同性的;②根据结构面处于极限平衡状态(即稳定性系数k=1),列出以参数c、φ为未知数的极限平衡方程;③利用FLAC3D进行三维数值计算,并从计算结果中提取求解极限平衡方程所需的数据,并将数据代入上述方程便可得到4个二元一次方程;④求解此矛盾方程组即可得结构面的长期抗剪强度参数c、φ值。
A set of structural planes (numbered J1 ~ J4) located in the ancient tuff quarry of Qingfeng Cave, Snupan Island, Sanmen County, Zhejiang Province were used as research objects. The long-term shear strength parameters of the structural plane were obtained by back analysis method. Cohesion c = 0.078 MPa, internal friction angle φ = 15.76 °. The specific steps of back analysis are as follows: ① Assuming that the structural planes J1 ~ J4 are in accordance with the Mohr-Coulomb criterion and the rocks are homogeneous and isotropic; ② According to the equilibrium state of the structural plane (ie, the stability coefficient k = 1) The limit equilibrium equation with parameter c and φ as unknown is listed. ③ The three-dimensional numerical calculation with FLAC3D and the data needed to solve the limit equilibrium equation are extracted from the calculation results and the data are substituted into the above equation to obtain 4 binary Once equation; (4) Solve this contradictory equations to get the long-term shear strength parameters c, φ of the structural plane.