非连续变形分析方法的改进及应用1）

首先,采用位移收敛判据对非连续变形的岩石断裂分析进行改进并程序实现. 其次,将非连续变形分析方法和裂隙网络渗流模型结合起来,建立了渗流应力耦合分析模型,研究了裂隙岩体变形对渗流的影响以及渗流与应力耦合作用下裂隙岩体的变形破坏特征. 研究发现,主干裂隙控制着渗流场分布,考虑耦合作用时的水头值比不考虑耦合作用时大,说明考虑耦合后坡体更容易变形失稳. 改进前后裂纹扩展形态基本不变,表明程序计算的收敛判据是有效的.

IMPROVEMENTS OF DISCONTINUOUS DEFORMATION ANALYSIS AND ITS APPLICATION 1)

The DDARF (discontinuous deformation analysis for rock failure) method is improved by using the displacement convergence criterion and a program is developed for the method. Combining the discontinuous deformation analysis (DDA) and the fracture network seepage (FNS) model,a hydro-mechanical coupling model is established. The effects of the deformation of the fractured rock mass on the fracture seepage and the failure characteristics of the rock mass under the hydro-mechanical coupling are studied. It is found that the main fracture plays a role of controlling the distribution of the seepage field. The water head with consideration of the coupling effect is larger than that without considering the coupling effect. Meanwhile, it is shown that the coupling helps the slope deformation and will lead to failure more easily. The program convergence criteria in the DDARF are compared with those of the laboratory tests and the engineering example. The form of the crack propagation does not change before and after the improvement. The results show that the program convergence criteria of the DDARF are effective.