城市地铁施工近邻短桩桥基加固效果研究

A study on the reinforcement of a short-piled overpass foundation in the vicinity of metro construction

结合北京地铁10号线国贸站西北风道施工对邻近短桩桥基影响的工程问题,运用ABAQUS软件,在对施工过程进行三维动态模拟的同时,针对不同的桥基加固方案,重点研究施工过程中桥基的变形和受力性态以及桩土相互作用机理,并将部分计算结果与量测结果进行比较。研究表明,桩基托换能够有效地减少施工期间桥基的沉降;通过地面支撑减载以及在短桩底部进行局部注浆加固处理不能有效地减少施工对桥基的沉降影响。所取得的研究成果为该工程施工提供决策和指导作用,也可供类似工程参考。

With regard to the effect on the adjacent short-piled overpass foundation induced by the construction of the Guomao station of Beijing Metro line 10, using the ABAQUS software, considering different reinforcement measures to protect the short-piled foundation, the metro construction process and its effect on the adjacent short-piled foundation are simulated, with an emphasis on the deformation and mechanics of the short-piled foundation as well as the mechanism of pile-soil interactions. It is found that the pile foundation settlement can be effectively controlled by underpinning, whereas ground-surface temporary support of the overpass or local grouting around the pile tips appears to have no significant effect on the pile foundation settlement.