基于随机动力学的边坡安全坡角估值方法探讨

对于广泛分布大量裂隙的岩质边坡，有些并无明显的软弱面，裂隙的分布方位对边坡稳定性就起着控制作用，但在实际工作中，往往存在安全坡角取值不准确的问题。传统方法是找到边坡内部裂隙的优势分组，应用赤平投影方法估计边坡安全坡角。随机动力学稳定性分析认为，最危险滑动面的滑动方向为边坡的倾向方向，岩壁上测量出的每一条裂隙都是随机的，对边坡的失稳都会造成一定的影响，裂隙可形成单一滑动面破坏或裂隙之间可随机组合形成楔形体进而对边坡造成破坏。以大连港东换流站的开挖边坡为实例，采用随机动力学方法与赤平投影分析相结合进行对比分析，给出合理的安全坡角。

Discussion on estimation method of safety slope angle based on stochastic dynamics

Some of the rocky slopes with a great quantity of fractures haven't weak planes, so the position of the fracture distribution is the key to the stability of the slope. The estimation of safety slope angle is usually incorrect in practical work. The conventional estimation method of safety slope is to find out the preponderant combination of the fractures inside the slope and use the stereographic method to estimate the safety angle. According to the stability analysis on the basis of stochastic dynamics, the sliding direction of the most dangerous sliding surface is the inclination of the slope. Every fracture on the rock face is stochastic, which influence the stability of the slope. These fractures may result in single sliding surface destruction or form wedge stochastically to cause the slope failure. The excavated slope of Donghuangliu Station of Dalian Port is taken for an example, the stochastic dynamics method and stereographic method are combined in the analysis to obtain the reasonable safety slope angle.