Abstract：By using the Rock Failure Process and Analysis code (RFPA)，which is based on the flow-stress- damage (FSD) coupling model，the behavior of multiple hydraulic fractures in the homogeneous rocks is simulated and investigated. The simulation results reflect macroscopic failure evolution process induced by microscopic fracture subjected to hydraulic loading，which agrees well with the experimental results. Based on the simulation research，it is pointed out that the pore pressure magnitude on a local scale around crack tip and the distribution of pore pressure on a global scale may both affect the behaviors of cracks and fractured pressure. The fractures always propagate towards the regions with higher local pore pressure and the fracture pressure decreases with the increment of local pore pressure. The research provides valuable guidance to the designers of hydraulic fracturing engineering.
