岩石边坡裂隙渗流的流形元模拟

为了能够更好地考虑裂隙渗流在岩石边坡破坏中的作用,在考虑裂纹扩展的数值流形方法程序基础上,从最小势能原理出发,阐述了渗流与变形的耦合作用机理并推导了相应的耦合方程,在程序中实现了对渗流与断裂的模拟。最后利用该程序对含初始裂隙的岩石边坡在渗流作用下的破坏过程进行了模拟。模拟结果很好地再现了边坡在渗流作用下的实际破坏过程。同时通过对裂纹扩展过程中应力强度因子的计算发现,第一应力强度因子始终大于第二应力强度因子,且随着计算时间增加,二者的差值逐渐增大,裂纹扩展以Ⅰ型为主。

NUMERICAL SIMULATION OF CRACK SEEPAGE IN ROCK SLOPE WITH MANIFOLD METHOD

In order to perfectly consider the role of crack seepage in rock slope failure, on basis of numerical manifold method program with the function of crack propagation, the coupling mechanism of seepage and deformation is illustrated and the corresponding coupling equations are deduced from the viewpoint of minimum potential energy principle. The simulation of seepage and fracture is implemented in the program. This program is used to simulate the failure of rock slope with an initial crack under seepage load. The results show that the crack begins to propagate under the initial water pressure, and gradually runs through the rockmass to form the block. Therefore, the block breaks away the original rockmass under the action of gravity. Meanwhile, from the calculation of the stress intensity factor (SIF) in the crack propagation, it can be seen that the first SIF value is always larger than the second one. With calculation time going on, the difference between them becomes larger. Hence, the crack propagation is mainly the type Ⅰ mode.