真空联合堆载预压填土边坡稳定性计算方法

摘要

According to the mechanism of vacuum surcharge preloading, it is necessary to consider the influences of consolidation effective stress and lateral shrink stress on the backfill soil slope stability under vacuum preloading. This paper deals with calculation method on the Matlab platform for backfill soil slope stability of vacuum surcharge preloading.%根据真空预压的机理，探讨了真空固结产生的有效应力及真空作用下特有的侧向收缩应力对真空联合堆载预压下填土稳定性的影响。依据竖向真空压力呈线性损失的假设，对稳定性公式进行优化，采用编制的matlab程序进行土坡稳定性计算，并与未考虑侧向收缩应力的稳定性计算结果进行比较。结果表明：考虑侧向收缩应力的稳定性安全系数一般提高14%；一次性堆载高度可以达到6m，较以往的计算方面提高了2m左右。