非均匀性对岩石水压致裂过程的影响

Influence of heterogeneity on hydraulic fracturing in rocks

使用岩石破裂失稳的渗流应力耦合系统研究带有圆孔的圆形岩石试件水压作用下的开裂、扩展和失稳过程。结果表明,岩石的非均质性导致破裂的初始压力和失稳压力明显不同,水压破裂路径不规则发展。

Circular samples with borehole are numerically loaded using flowcoupled Rock Failure Process Analysis code (F-RFPA2D) under internal hydraulic pressure rising at a constant rate under zero confining pressure to investigate the hydraulic fracture initiation, propagation and breakdown. Our findings are:heterogeneity of rock has a significant influence on initiation?breakdown pressure and irregular hydraulic fracture trajectory;hydraulic fracture initiation occurs considerably early before breakdown pressure is reached;the random location of the individual inhomogeneities results in an irregular hydraulic fracture trajectory.