某基坑开挖施工对邻近铁路的影响分析

Analysis on the Infl uence of Excavation Construction of a Foundation Pit on Adjacent Railway

文章以某基坑邻近既有高速铁路线路为工程背景,采用数值模拟的方法对基坑围护结构及开挖施工进行研究分析,结果表明,高铁路基最大沉降为-0.95 mm,顺线路方向最大位移为0.63 mm,垂直线路方向最大位移为0.9 mm,均能满足规定要求的1 mm限值要求;对邻近铁路侧考虑加强支护及坑内分块开挖,有效控制基坑变形;通过基坑侧壁安全等级的差异化设计,取得了保护铁路安全并实现投资控制的双赢结果。

Based on the engineering background of a foundation pit adjacent to the existing high-speed railway line,the numerical simulation method is used to study and analyze the retaining structure and excavation construction of the foundation pit.The results show that the maximum settlement of the high-speed railway subgrade is-0.95 mm,the maximum displacement in the direction of the line is 0.63 mm,and the maximum displacement in the direction of the vertical line is 0.9 mm,all of which can meet the specified limit of 1 mm;strengthening the support and block excavation in the pit on the side adjacent to railway have been considered to effectively control the deformation of the foundation pit;through the differential design of the safety level of the side walls of the foundation pit,a win-win result of protecting the railway safety and realizing the investment control has been achieved.