地铁基坑开挖下周围土体应力-变形分析  

Stress-deformation analysis of soil around subway foundation pit excavation

作　　者：尹明远 Yin Mingyuan(China Railway 15th Bureau Group Co.,Ltd.,Shanghai 200070,China)

机构地区：[1]中铁十五局集团有限公司,上海200070

出　　处：《山西建筑》2024年第1期89-93,共5页Shanxi Architecture

摘　　要：通过开挖应力路径的理论,对地铁基坑周围土体的应力-应变进行分析。从基坑侧面土体、底部土体、开挖过渡区土体的应力-应变三方面进行论述,得出了基坑边侧土体应变为负,有向基坑方向的水平位移,对基坑支护结构产生挤压,竖直方向应变为正,土体会下沉;基坑底部土体应变为负,会向上隆起,水平向应变为正,土体会压缩;过渡区域土体影响较小。解决了基坑开挖情况下无法严格控制基坑变形的问题,从而可以考虑不同施工顺序对周边环境、支护结构及结构应力变形影响,进而提升了基坑安全可靠性。Based on the theory of excavation stress path,the stress-strain of soil around subway foundation pit is analyzed.The stress-strain of soil on the side of the foundation pit,soil at the bottom and soil in the excavation transition area is discussed.It is concluded that the strain of soil on the side of the foundation pit is negative,there is horizontal displacement in the direction of the foundation pit,which compresses the supporting structure of the foundation pit,and the vertical strain is positive,and the soil will sink.If the soil strain at the bottom of the foundation pit is negative,it will uplift upward,and if the horizontal strain is positive,the soil will compress.The influence of soil in the transition area is small.It solves the problem that the deformation of foundation pit cannot be strictly controlled under the condition of foundation pit excavation.Thus,the influence of different construction sequences on the surrounding environment,supporting structure and structural stress and deformation can be considered,and the safety and reliability of foundation pit can be improved.

关 键 词：应力路径 基坑开挖 应力 应变 

分 类 号：TU431[建筑科学—岩土工程]