基于离散单元法的裂隙岩体渗流应力耦合分析

Coupling analysis of seepage and stress in fractured rock mass based on the distinct element method

文章从离散单元法的基本原理和岩体裂隙网络渗流的特点出发,以节理开度变化为纽带,对裂隙岩体渗流场与应力场耦合的离散网络模型进行分析,并用离散元数值方法结合算例分别进行了渗流场与应力场的耦合、非耦合计算。结果表明:耦合计算所得到的应力、位移和渗流量与非耦合计算得到的结果相比,都有不同程度的增大。因此,应从渗流场应力场两场耦合的角度考虑,才能提供更加符合实际的满足安全性的解答。

Based on the postulation of the distinct element method and the characteristics of fluid flow through joint networks of rock mass and taking the change in joint width as ligament, the fracture network model of the coupled seepage and stress fields in fractured rock mass is studied. The coupled and uncoupled analyses of the stress field and seepage field combining a computation example are studied respectively with the distinct element method. The results show that the stress, displacement and seepage discharge of coupled analysis are larger than those of uncoupled analysis. Therefore more actual and securer resolution can be obtained when the coupling of stress field and seepage field are considered.