软土区域基坑倾斜桩支护优化方案研究

Study on Optimization Scheme of Inclined Pile Supporting for Foundation Pit in Soft Soil Area

倾斜桩支护结构具有造价低、变形小、便于开挖等特点,然而其支护性能及方案优化尚缺乏深入研究。本文基于天津国印二期基坑工程,运用有限元方法对比研究双排倾斜桩支护结构与传统支护体系的变形与受力性能,并提出最优支护方案。研究结果表明:双排倾斜桩支护结构中,冠梁及斜桩组成一个空间结构,斜桩受到较大轴力,内斜桩和外斜桩分别起到类似斜撑和锚杆的作用。相比于传统支护结构,双排倾斜桩支护结构能够显著减小结构位移和内力,同时锚索的加入能进一步提高其支护性能。

Inclined pile supporting structure has the characteristics of low cost,small deformation and easy excavation.However,there is a lack of in-depth research on the supporting performance of inclined pile and its scheme optimization.Based on the excavation project of Tianjin Guoyin Phase Ⅱ,this paper used the finite element method to compare and study the deformation and mechanical performance of the double-row inclined pile supporting structure with the traditional support systems,and put forward the optimal support scheme.The results show that in the double-row inclined pile supporting structure,the crown beam and inclined pile constitute a spatial structure,the inclined pile is subjected to greater axial force,and the inner inclined pile and outer inclined pile play a similar role to the inclined strut and anchor,respectively.Compared with the traditional supporting structure,the double-row inclined pile supporting structure can significantly reduce the structural displacement and internal forces,and the installation of anchor could further improve its supporting performance.