水驱型层状岩质边坡破坏机理的讨论

摘要

The failure of the hydraulic-driven layered rock slope is a gradual process.Based on the fracture mechanic,the formula of critical depth which water-filled in the slope was deduced;the mechanism through microcracks in the initial stage of the landslide was analyzed;the reason of fracture between layers were explained.The results show that,in a long time,water influences the slope by physical and chemical effect.The critical length of layer is related to angle of slope,porosity,thick,hydro-static pressure and hydraulic gradient slope.A sudden increase pressure of water accelerates the slope failure.According to above,the new idea of governance was put forward.%水驱型层状岩质边坡的破坏是一个渐进的过程.以断裂力学为理论基础,推导了边坡后缘裂隙充水的临界深度公式;分析了滑坡发生初期内部微裂纹的贯通机制;对顺层赋水边坡的层间破坏给出了解释.研究结果表明,水对坡体的影响在相当长的时间里是以物理化学作用为主,层状岩体破坏的临界长度与坡角、孔隙率、层厚、水头和水力坡降有关,内水压力的骤然升高会加速边坡失稳,据此提出了新的治理思路.