悬臂支护中土体加固的影响分析

Analysis on the Influence of the Soil Reinforcement in Cantilever Retaining

在软土地区的基坑支护工程中,对于浅基坑常采用在基坑底部加固的方法来减小基坑侧向位移。为了探究坑底加固土体对围护结构的变形和内力影响规律,以弹性支点法为基础建立了悬臂式支护基坑的有限元模型,分析了坑内土体不同加固深度及加固程度对支护结构变形及内力的影响。分析认为,围护结构位移随坑底加固深度增加而逐渐减小,达到一定深度时位移趋于一致,支护结构内力受影响较小;加固程度增大,位移减小,且存在临界加固程度。因此,选择合理的坑内土体的加固深度及程度可以达到安全、经济的目的。

In soft soil foundation pit support engineering, the foundation pit was often used in the foundation pit reinforcement method to reduce the lateral displacement of the foundation pit. In order to explore the bottom soil reinforcement of retaining structure deformation and internal force of influence, to the elastic supporting method as the foundation established the finite element model of the foundation pit, the model was used to analyze the reinforcement effect of depth and degree of cantilever retaining structure deformation and internal force of the soil inside the pit. The results showed that the displacement of the cantilever retaining structure with the reinforcement depth and degree of increasing decreases, but also the existence of critical reinforcement depth and degree; internal force of cantilever retaining structure by strengthening depth and extent was less affected. Therefore, it was reasonable to determine the depth and extent of the reinforcement of the pit could not only ensure the safety of the foundation pit, but also could save the cost of the project.