中文摘要：

岩体结构面连通率是反映结构面延伸程度和连通状况的一个重要参数，是确定裂隙岩体抗剪强度指标的关键和分析边坡稳定性的前提。对三维连通率的求解方法及其在估算抗剪强度参数中的应用进行探讨，在考虑结构面迹长和迹线与统计窗边线的交角均遵循一般概率分布类型的基础上，从概率统计角度推导出窗口法中结构面平均迹长的估算公式。利用基于平均迹长修正公式的三维结构面网络模拟方法对贵阳市鱼简河水利工程导流洞进口的岩体结构面进行模拟，在其三维可视化模型的基础上求得模拟区内不同截面的三维连通率，并利用三维连通率结果估算出岩体的综合抗剪强度参数。计算结果表明：该模拟区内岩体总体连通性较好，各向异性明显，70°～80°∠20°～40°范围内的截面为危险截面，最大连通率为0.9143，最小黏聚力和内摩擦角分别为1.135MPa和25.7°，工程建设中应予以重视。

英文摘要：

Connectivity rate of discontinuities in rock mass is an important parameter as a reflection of the joints＇ extendible extent and connectivity status, which is also a key factor of estimating the shear strength parameters of fractured rock mass, as well as the precondition of rock slope stability. A calculating method for three-dimensional connectivity rate of rock mass discontinuities has been presented based on 3D network simulation, and its application to shear strength parameters estimation is also discussed. A new technique to estimate the mean trace length in sampling windows by considering the general probabilistic distribution of trace length and obvious decline of discontinuities is suggested using probability statistic method. The estimated mean trace length has been used to construct 3D discontinuous network model of rock mass from the entrance of the diversion tunnel of Yujianhe Hydraulic Project in Guiyang Province. The precision of the model is improved. Based on the constructed 3D network model, the values of 3D connectivity rate in different cross-sections have been figured out by slice method and then they are used to estimate the shear strength parameters of the simulated rock mass through weighted average method. The results show that the anisotropy of rocks in this area is quite obvious and the connectivity is well-developed. The planes with tendency of 70° - 80° and inclination angle of 20°- 40° are dangerous cross sections, in which the maximum connectivity rate is 0.914 3 and the minimum cohesion and internal friction angle are 1.135 MPa and 25.7°respectively, therefore, more attentions should be paid to engineering construction.