土岩复合地层基坑围护结构变形受力简化计算方法

Simplified Calculation Method for Deformation Force of Foundation Pit Retaining Structure in Soil-rock Composite Stratum

基于土岩复合地层特性,将基坑开挖分为土层开挖和岩层开挖两个阶段,假定围护结构嵌岩端为固定端,并忽略岩层开挖阶段岩石对基坑围护结构的侧向压力,推导得出各阶段围护结构的变形受力公式,提出了土岩复合地层基坑围护结构变形受力简化计算方法。通过案例基坑对比分析了文章提出的理论计算方法和数值模拟的计算结果。结果表明文章提出的简化计算方法的假设具有一定的合理性和适用性,计算结果具有一定的参考价值。

Based on the characteristics of soil-rock composite stratum,the excavation of foundation pit is divided into two stages:soil layer excavation and rock layer excavation,retaining structure rock-socketed segment is assumed to be the fixed end,and ignore rock lateral pressure of rock excavation stage,the deformation and force formula of the enclosure structure at each stage is deduced,the results of simplified calculation method and numerical simulation are compared and analyzed by setting a case foundation pit.The results show that the assumption of the simplified calculation method is reasonable and applicable to a certain extent,and the calculation results have a certain reference value.