临河地铁深基坑开挖在大偏压作用下的支护结构性状研究

某地铁深基坑紧邻河边,且开挖过程中基坑两侧荷载不一致,存在大偏压,施工风险较大。为了深入研究临河深基坑开挖过程中大偏压作用下支护结构的受力性状,运用岩土工程有限元软件PLAXIS模拟临河大偏压深基坑开挖全过程。计算结果表明,在大偏压作用下,临河基坑两侧的支护结构位移、内力与普通的基坑存在较大差异,设计中需根据实际受力采用相应的支护结构及加固措施。另外,对加固形式、支护结构刚度等不同工况进行计算,总结了一些基本规律,为临河深基坑在大偏压作用下支护结构的设计提供有益的参考。

Research on Characteristics of Retaining Structures for Riverine Subway Deep Excavation under Excessive Eccentric Compression

This paper introduces one subway deep foundation pit adjacent to the river. In the process of the excavation of the foundation pit,the loads on both side of the pit are unsymmetrical and the incurred excessive eccentric compression imposes great risks. In order to reveal the deformation and internal force of the retaining structures,PLAXIS is adopted to simulate the excavating process. The analytical results show that under the unsymmetrical load,there are big differences in retaining structure displacement and internal force between the riverine deep foundation pit and the common foundation pit. Thus,corresponding retaining structure and the reinforcement measures should be considered in the design. In addition,this article also addresses the different reinforcement mode and stiffness conditions and summarizes some basic laws, which may provide some references for the design of riverine deep foundation pit retaining structure under excessive eccentric compression.