含孔岩体破裂过程的无单元法数值模拟

根据岩体损伤程度对其渗透性和强度的影响,利用定义的损伤变量建立了应力-渗流-损伤的耦合分析模型.综合考虑应力、渗流、损伤之间的相互作用影响,模拟分析了含孔岩体在不同水压力作用下破裂的过程.分析表明,内水压力是促使裂纹扩展的一个重要因素,内水压力增加可以使原来停止扩展的裂纹重新扩展或者使原来闭合的裂纹重新张开,而且裂纹张开度的变化将导致裂纹内的渗流特性发生改变.

Numerical simulation of cracking process of rock mass with hole by element-free method

The influence of rock damage degree on the permeability coefficient and intensity of a rock mass was described by defining a damage variable,and a stress-seepage-damage coupling analysis model was established and used to simulate the cracking process of a rock mass with a hole.The results show that the inner water pressure is an important factor in the crack's propagation,and that the increment of inner water pressure can make the crack re-expand,or make the closed crack re-open.It is also indicated that the change of the crack width will result in the change of seepage characteristics within the crack.