软土基坑桩锚支护结构变形特征数值模拟分析——以连云港某基坑桩锚支护为例

Numerical Modelling of Deformation Characteristics of Pile-Anchor Retaining Structure of Soft-soil Foundation Pit— A Case Study of a Pile-Anchor Retaining Structure of a Foundation Pit in Lianyungang

为分析桩锚支护结构在软土基坑支护中的适用性,结合连云港地区某基坑工程实例,分析了桩锚支护结构的变形特征,并通过建立的数值模型计算了不同锚索锚固角度对基坑变形的影响。结果表明:软土基坑支护中锚索锚固角度与边坡支护中存在差异,在软土基坑支护中无最优锚固角,而是锚索锚固角度越小越有利;在软土基坑中,桩锚支护结构容易产生转动现象,这种现象更加剧了土体的变形,且锚索锚固角度越大时越容易转动,当锚固角度达一定值时桩底甚至出现了反向位移。

In order to analyze the applicability of the pile-anchor retaining structure in soft-soil foundation pit sup- port, taking a foundation pit project in Lianyungang as an example,this paper analyzes the deformation characteris- tics of pile-anchor retaining structure, and establishes the numerical model to compute the impacts of different an- choring angles on foundation pit deformation. The results show that the anchoring angles in soft-soil foundation pit are different from those in slope retaining, which means there is no optimal anchoring angles, instead, the smaller the anchoring angle is,the more favorable it is to the foundation pit retaining ~ in soft-soil foundation pit,the pile an- chor structure tends to rotate, which exacerbates the deformation of soil, and the larger the anchoring angle is, the more easily the retaining structure rotates. There even appears a reverse displacement at the pile bottom when the anchor angle reaches a certain value.