不同约束条件下的围护桩受力分析  

Mechanical Analysis of Fender Piles under Different Constraints

作　　者：郭力[1] 何朋立[1] 

机构地区：[1]洛阳理工学院土木系,河南洛阳471023

出　　处：《地下空间与工程学报》2015年第4期874-878,共5页Chinese Journal of Underground Space and Engineering

摘　　要：在基坑支护中围护桩被广泛采用,且常与其他形式的加固措施联合使用,因而将围护桩作为悬臂式结构进行计算分析,在一定程度上是不合理的。以合肥某地铁车站深基坑为例,将不同形式的加固措施抽象为力学上的约束条件。采用有限元方法计算分析了不同约束条件下围护桩的受力与变形。计算结果表明,对围护桩顶端施加侧向位移约束可有效减小桩体的侧向变形与所受弯矩,因而应尽可能地施加水平支撑或锚杆。对桩顶端角位移的约束也可有效减小桩体的侧向变形,因此,冠梁的存在是必要的。深基坑的施工中,应采取多种措施增加围护桩的约束,提高其稳定性,从而更好地保证基坑安全。The fender piles are extensively used as retaining structure in the foundation pit excavation. And it is always combined with other reinforcement measures. So it is unreasonable to a certain degree that the fender pile is analyzed as cantilever structure. Taking the deep foundation pit of a subway station in Hefei Province for instance,different reinforcement measures were abstracted as mechanical restrained conditions. And the behavior of fender pile under various restrained conditions was analyzed by FEM. The results showed that applying the constraint on lateral displacement of fender pile top could effectively reduce the lateral deformation and bending moment of the pile.Therefore,the horizontal bracings and anchor rods should be used as far as possible. The constraint on angular displacement of fender pile top also could effectively reduce the lateral deformation of pile. So the use of top beam was necessary. During construction of deep foundation pit,various measures should be implemented to increase constraints on fender pile. This would enhance stability of fender pile,and better ensure the safety of foundation pit.

关 键 词：围护桩 约束条件 基坑 稳定性 地铁 

分 类 号：TU473.2[建筑科学—结构工程]