摘要：Darcy's law only applying to the flow domain is extended to the entire fracture network domain including the dry *** partial differential equation(PDE) formulation for unconfined seepage flow problems for discrete fracture network is established,in which a boundary condition of Signorini's type is prescribed over the potential seepage *** order to reduce the difficulty in selecting trial functions,a new variational inequality formulation is presented and mathematically proved to be equivalent to the PDE *** numerical procedure based on the VI formulation is proposed and the corresponding algorithm has been *** a continuous penalized Heaviside function is introduced to replace a jump function in finite element analysis,oscillation of numerical integration for facture elements cut by the free surface is eliminated and stability of numerical solution is *** numerical results from two typical examples demonstrate,on the one hand the effectiveness and robustness of the proposed method,and on the other hand the capability of predicting main seepage pathways in fractured rocks and flow rates out of the drainage system,which is very important for performance assessments and design optimization of complex drainage system.

摘要：结合露天矿边坡实际情况,利用FLAC^(3D)数值模拟软件对露天矿边坡进行三维数值模拟分析,运用有限元强度折减法计算边坡稳定安全系数。为研究各因素对边坡稳定性的影响,选取6个典型边坡影响因素(内摩擦角、黏聚力、抗拉强度、重度、弹性模量和泊松比)设计正交试验,采用FLAC^(3D)数值软件对正交实验方案进行模拟运算,运用多因素灰色关联分析法分析计算结果,并与单因素分析进行对比。结果表明:根据计算不收敛这一判据,求解安全系数流程简单,在满足精度要求的情况下,求得边坡安全系数为1.96;2种分析方法计算得出的各因素敏感性大小基本一致,内摩擦角对边坡稳定性的影响最大,其次是黏聚力,泊松比的影响最小。其中,多因素分析过程中正交实验灰色理论耦合分析考虑各因素之间的交互作用,通过计算各影响因素之间的关联度,得出各影响因素的敏感性大小,所得结果更加可靠。