论文部分内容阅读
为研究隧洞围岩周边径向裂隙的水力劈裂问题,利用复势法分别给出了高水压和构造应力两种因素作用下围岩径向裂隙应力强度因子的解析公式。研究表明:在压应力构造应力场中,构造应力只主导裂隙的Ⅱ型扩展,围岩孔隙水压力只主导裂隙的Ⅰ型扩展;侧压力系数和构造主应力与裂隙夹角是影响裂隙Ⅱ型扩展的重要因素。研究结论对于进一步研究高水压和构造应力对径向裂隙的水力劈裂效应具有重要的参考价值。
In order to study the hydraulic fracturing of radial fractures around the surrounding rock of tunnel, the analytical formula of stress intensity factor of the radial fractures of surrounding rock under high hydraulic pressure and tectonic stress is given by the complex potential method. The results show that in the stress field of compressive stress, the tectonic stress only dominates the type Ⅱ expansion of the fracture, and the pore water pressure of the surrounding rock only dominates the type Ⅰ expansion of the fracture. The lateral pressure coefficient and the angle between the tectonic principal stress and the fracture are the factors that affect the fracture type Ⅱ Expansion of the important factors. The conclusion of the study is of great value to further study the hydraulic fracturing effect of high hydraulic pressure and tectonic stress on radial fractures.