基于改进地下水力分布假设,运用极限平衡方法,综合考虑锚固效应、冰雪冻胀作用和地震荷载的影响,推导出典型岩石边坡倾覆稳定系数计算式。算例分析表明:采用改进后的水力分布假设进行岩石边坡倾覆稳定性分析更加合理;出流缝堵塞、地下水位升高、锚杆(索)锚固力和设置高度降低、冰雪冻胀作用加强、水平背向坡体和竖直向上的等效地震荷载对岩石边坡倾覆稳定性不利;锚杆(索)设置角度对边坡倾覆稳定性影响不大。同时,绘制了饱水岩石边坡倾覆稳定系数与几何要素之间的关系图,据此可迅速判定复杂条件下一定几何要素饱水边坡的倾覆稳定状态,便于工程实际运用。
Based on the assumption of improved groundwater pressure distribution,using limit equilibrium method,considering the influence of anchoring effect,frost-heaving force of ice and snow,and seismic loading,the calculation formula of overturning stability factor of typical rock slope is derived. The calculation example analysis shows that( 1) it is more reasonable for the overturning stability analysis of the rock slope by using the assumption of improved water pressure distribution;( 2) blocked outflow joint, higher groundwater level,lower anchoring force and height of anchor rod( rope),stronger frost-heaving force of ice and snow,equivalent seismic loading which horizontally inwards the slope and upward vertically have adverse effect on the rock slope overturning stability;( 3) the impact of the design angle of the anchor rod( rope) on the overturning stability of the rock slope is small. Meanwhile,the relationship diagram between overturning stability factor and geometry of saturated rock slope is drawn,thus the overturning stability status of saturated rock slope with a certain geometry under complex conditions can be quickly determined,which can be easily used in engineering practice.