基于DDA方法一种流-固耦合模型的建立及裂隙体渗流场分析和应用  

Coupled hydro-mechanical model based DDA method for seepage analysis of fractured rock mass and its application

作　　者：虞松[1] 朱维申[2] 张云鹏[1] 

机构地区：[1]山东大学土建与水利学院工程力学系,山东济南250061 [2]山东大学岩土与结构工程研究中心,山东济南250061

出　　处：《岩土力学》2015年第2期555-560,共6页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.41072234);岩土力学与工程国家重点实验室开放课题(No.Z013008)

摘　　要：以非连续变形分析方法(DDA)为基础并采用稳态流体计算方法将二者结合进行裂隙岩体流-固耦合分析。利用DDA方法生成裂隙岩体模型,在此基础上采用矩阵搜索等方法形成新的裂隙水通网络模型。采用稳态迭代算法和立方定律求得裂隙水压力,并把裂隙水压力作为线载荷施加到块体边界,在DDA算法中每个迭代步完成后更新裂隙开度和水压值,与DDA算法结合研究裂隙水与块体之间相互作用关系。利用以上裂隙岩体流-固耦合计算方法研究了某水封油库开挖和运行过程洞室围岩流量和密封性,为该工程预测水封效果提供了有益的主要依据,也是国内首次采用DDA方法做大型工程的流-固耦合模型分析。A coupling analysis model is proposed to study the hydro-mechanical response of the fluid flow in fractured rock mass with the method of discontinuous deformation analysis （DDA）. A model of fractured rock mass is generated with the DDA method. Based on this model, the fracture water network is also generated with the matrix search method. In the fluid flow analysis, the cubic law is applied to study the steady flow along the fractures using the steady-state equilibrium iteration method. Hydraulic pressure is treated as a line loading in the DDA framework, and the aperture and hydraulic pressure in the fracture line are updated every iteration step, followed by the coupled motion equations expressed in the DDA framework, to study the interaction between the fluid flow along the fractures and the movement of the rock blocks. A real case of cavern excavation is selected to study the influence of fluid flow with water tunnel during the excavation and operation phases with the proposed DDA coupled 2D hydro-mechanical model. The results show that the DDA coupled hydro-mechanical model is suitable for the stability and seepage analysis of practical engineering problems.

关 键 词：水通网络生成 流-固耦合模型 非连续变形分析 流量 地下油库 

分 类 号：TU457[建筑科学—岩土工程]