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通过对坡顶荷载作用下的边坡进行受力分析,得到竖直条分下边坡稳定性安全系数简化Bishop法计算公式。将坡顶荷载划分为矩形、梯形和三角形这3种型式,分别研究各型式在坡顶荷载位置、大小及长度变化时其对边坡稳定性的影响规律,可得:(1)当坡顶荷载的位置增大时,边坡所得的安全系数增大,当坡顶荷载的大小及长度增大时,边坡所得的安全系数减小;(2)当坡顶荷载远离坡顶点一定距离时,坡顶荷载对边坡的稳定性基本无影响;(3)当坡顶荷载的长度达到一定程度时,其对边坡稳定性的影响趋于稳定;(4)坡顶荷载的大小变化对边坡的临界滑动面影响较小;(4)从对边坡稳定性影响的大小来看,矩形荷载最大,梯形荷载次之,三角形荷载最小。
Through the stress analysis of the slope under the action of the slope load, the simplified Bishop method formula for the safety factor of slope stability under the vertical section is obtained. The top load is divided into three types: rectangle, trapezoid and triangle. The influence of each type on the stability of slope when load position, size and length change are studied respectively. (1) When the location of load increases, the safety factor of slope increases. When the size and length of slope load increase, the safety factor of slope decreases. (2) When the load of slope is far away from the peak of slope, (3) When the length of slope top load reaches a certain extent, its influence on slope stability tends to be stable; (4) The change of the load on the top of the slope The influence of the critical slip surface of the slope is small; (4) According to the influence on the stability of the slope, the rectangle load is the largest, the trapezoidal load is the second, and the triangle load is the smallest.