割缝钻孔水压致裂增透过程的数值模拟

Numerical Simulation of Process of Hydraulic Fracturing of Slotted Drilling

利用岩石破裂过程渗流-应力耦合分析系统RFPA2D-Flow,对比分析了单孔和割缝钻孔水力压裂失稳破裂过程。结果表明:割缝钻孔预制缝槽转移集中应力达到卸压效果,诱导高压水流沿缝槽形成主裂隙向外扩展,有效削弱煤岩的强度和整体性达到水压致裂增透的效果;水压致裂裂隙路径的粗糙度和不规则展布受围岩非均匀性的影响十分显著。

Using the coupled seepage and stress of rock failure process analysis system RFPA2D-Flow,analysis of the single drilling and slotted drilling hydraulic fracturing buckling failure process.The results showed that the slotted drilling precast slot transfer unloading effect of stress concentration,induction of high pressure water flow along the slot form the main crack extension outward,effectively weaken the strength of the coal and rock and integrity to achieve the effect of hydraulic fracturing increase through; hydraulic fracturing fracture roughness of the path and irregular distribution affected by surrounding rock heterogeneity is significant.