多裂隙岩体渗流特性数值模拟研究

Study on numerical simulation of seepage law for multi-crack rock

为了研究在水力压裂作用下多裂隙岩体的渗流特性,本文采用岩石破裂过程RFPA数值分析系统和控制变量法,研究多裂隙岩体在不同裂隙角度、不同围压及轴压时,裂隙的扩展演化过程。模拟结果表明:随着岩体天然裂隙角度的增加,裂隙的萌生和扩展逐渐减弱;外界条件对水力压裂作用下裂纹的萌生和扩展是不可忽略的,其最大主应力控制着裂纹的扩展演化。

In order to study the seepage properties of fractured rock mass under the role of hydraulic fracturing, the paper adopted numerical analysis system RFPA in process of rock failure and control variate method to study the evolutionary process of crack for fractured rock mass at different angles,confining pressures, axial compression. Simulation results show that crack initiation and expansion gradually diminishe with the increase of angle of crack. The action of external conditions on crack initi- ation and expansion under hydraulic fracturing is not ignored. The evolution of crack is controlled by the maximum main stress.