某基坑支护中圆撑与角撑的应用对比分析

Contrastive analysis on the application of circular brace and angle brace in a foundation pit support

采用有限元计算软件Midas GTS NX,对圆撑和角撑两种支撑体系下的基坑开挖过程进行了对比计算,得出圆撑的围护桩变形比角撑大,但能满足基坑的变形要求,且围护桩变形与实际情况更为吻合。相对于角撑,圆撑能减少支撑的长度和立柱桩的数量,具有更好的经济性,且能提供更大的施工空间,值得优先推广运用。论证了圆撑支护的合理性。

By using the finite element software Midas GTS NX,the excavation process of foundation pit under two kinds of bracing systems,circular brace and angular brace,is compared and calculated.It is concluded that the deformation of retaining pile with circular brace is larger than that of angular brace,but it can meet the deformation requirements of foundation pit,and the deformation of retaining pile is more consistent with the actual situation.Compared with angle bracing,circular bracing can reduce the length of bracing and the number of column piles,has better economy,and can provide greater construction space,which is worthy of priority promotion and application.The rationality of circular bracing is demonstrated.