软土地基上桥台桩基受力算法研究  

Research on Algorithm for Mechanics of Abutment Pile Foundation on Soft Ground

作　　者：易笃韬[1] 邵旭东[1] 李立峰[1] 许春绵 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]江门市交通局,广东江门529000

出　　处：《中国公路学报》2007年第5期59-64,共6页China Journal of Highway and Transport

基　　金：国家高技术研究发展计划("八六三"计划)项目(2006AA11Z104)

摘　　要：结合位于珠江三角洲软土地区的2座梁桥桥台病害的实地检测情况,对软土地基上桥台受力机理进行了分析。通过结合Ito基于塑性变形理论推导的用于计算位于移动土体中的桩基所受到的挤压力的理论计算公式和有限元分析方法,建立了符合软土地基桥台桩基实际受力情况的平面杆系计算模型。通过将计算结果与随后进行的16根桥台桩基的钻芯取样结果进行对比,揭示出了这2座桥的桥台桩基产生严重断裂的真正力学原因,从而初步找到了一种适合于软土地基上桥台桩基的计算方法。Authors discussed the mechanical mechanism of the abutment on soft ground based upon the field investigation on the damaged abutments of two beam bridges located in the area of Pearl River Delta. A suitable analytical approach modeling the practical characteristics of abutment pile foundation on soft ground was constructed by combining the FEM with the ho formula, which was used to calculate the extrusion pressure of piles in movable soil mass based upon plastic deformation theory. The effectiveness of the analytical modeling was confirmed through core drilling on the total number of 16 piles of abutments. It is concluded that the analytical approach can explain the real causes of pile breaking, and it is feasible to compute and design the abutment pile foundation on soft ground.

关 键 词：桥梁工程 桥台桩基 模型分析 挤压力 软土地基 断桩 

分 类 号：U443.15[建筑科学—桥梁与隧道工程]