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本文在分析两次基坑边坡塌方事故的基础上,总结了两个边坡的共性。分别选取直线和圆弧线作为滑移线,利用条分法进行稳定性演算,并与有限元强度折减法求得的安全系数进行比较,发现直线条分法与强度折减法得到安全系数相近,都大于圆弧条分法得到的安全系数,而且有限元法得到的塑性贯通区近似直线而非圆弧线,充分证明了坑底为岩石、边坡部分为土层的基坑边坡,其失稳滑移线应取直线。最后依据两次事故的经验,针对该类边坡的支护设计提出一些建议。
Based on the analysis of two landslip accidents of foundation pit, this article summarizes the commonality of the two slopes. The straight line and the arc line are respectively selected as the slip line, and the stability calculation is made by using the bar method. Compared with the safety factor calculated by the finite element strength reduction method, it is found that the safety factor obtained by the straight line method and the strength reduction method is similar, Are greater than the safety factor obtained by the arc bar method, and the plastic through-area obtained by the finite element method approximates a straight line instead of a circular arc, which fully proves that the bottom of the pit is rock and the slope part is a foundation pit slope, The slip line should be taken straight line. Finally, based on the experience of the two accidents, some suggestions are put forward for the support design of the slope.