Study on numerical simulation of hydrofracturing process in rock containing circle hole

摘要

Hydraulic fracturing is a typical failure process of coupling seepage flow and stress.Numerical simulation of the hydraulic fracturing process is studied by using Coupling System RFPA2D of Flow and Solid in Rock Failure Process.The research results show that pore water pressure under the rock burst is divided into three stages: crack initiation stage, micro crack extension stage and the stage of crack instability propagation, the crack initiation and propagation can be judged by rock failure process changes in the flow and stress, when crack grow into the instability of extension stage, acoustic emission occurs a large kick, the kick pressure is called the critical buckling pressure of rock failure process, monitoring critical pressure with acoustic emission have certain guiding significance for engineering practices.