DDA中裂隙岩体渗流网络识别方法的改进及应用

裂隙网络是岩体渗流的主要通道,对其进行准确高效的识别是实现基于DDA的渗流应力耦合方法的重要步骤。通过建立环块体裂隙排列数组,以裂隙为搜索路径,提出更简单、效率更高的节点识别方法;同时提出外边界、边界节点及外边界角点的识别方法,构建出包括以上要素的完整裂隙网络,使外水压力荷载能有效施加在块体系统上,扩展DDA裂隙网络识别方法的适用性。将此方法应用于基于DDA的渗流应力耦合模型,并结合算例进行考虑渗流应力耦合的数值计算。结果表明,该方法可准确识别出复杂裂隙网络,可结合基于DDA的渗流应力耦合程序完成模拟计算。研究成果为裂隙岩体在渗流状态下的失稳判断提供了依据。

Improvement and Application of Recognition Method of Seepage Network in Fractured Rock Mass in DDA

Fracture network is the main channel of seepage in rock mass.Accurate and efficient recognition of fracture network is an important step of the DDA-based seepage-stress coupling method.By setting up the matrix of fractures’sequence around the block and using fractures as the search path,a simpler and more efficient node recognition method was proposed in this paper.At the same time,the recognition methods of the outer boundary,boundary nodes and outer boundary vertices were proposed to build a fracture network consisted of the factors above.It enabled the external water pressure to be loaded effectively to the block system,and expanded the applicability of the recognition method of fracture network in DDA.The new method was applied to the seepage-stress coupling model based DDA,and the numerical calculation of seepage-stress coupling was completed in combination with examples.The results show that the method can accurately recognize the complex fracture network and complete the simulation calculation combined with the DDA-based seepage-stress coupling program.The research results provides a basis for judging the instability of fractured rock mass in the seepage state.