双排桩设计在高层建筑深基坑支护中的应用

Application of Double-Row Piles in Deep Excavation Supporting System of High-Rise Buildings

在总结几种经典的双排桩计算模型基础上提出了局部土压力分析方法,该方法考虑了桩与土的摩擦角δ及土体的黏聚力c。局部土压力分析方法主要是针对桩间局部土体及桩后的部分土体的研究,通过试算法得出假设的滑裂面与水平面的夹角,进而求得桩间及桩后局部土体的主动土压力。采用有限杆单元法、弹性地基梁理论并结合提出的局部土压力分析方法是一种新的双排支护桩计算方法。并将此方法应用到工程实例中,探讨了双排桩在不同排距条件下对桩身弯矩和位移的影响。

A local horizontal earth pressure estimation method is proposed based on the review of existing methods of estimating lateral earth pressure on double-row piles.The proposed method considers the friction angles between the pile and adjacent soils as well as cohesion of soils.This method focuses soils between piles and after the double-row pile structure and the angle of slip surface to the horizontal line is obtained through trial and error so that the active earth pressure on the double-row pile structure can be derived.This proposed earth pressure method is based on the finite bar element theory and elastic beam theory and is applied in a case history to evaluate the effect of spacing between front and rear piles on the bending moment and displacement on piles.