考虑空间效应的深基坑变形特性研究

Research on deformation characteristics of deep foundation pit considering spatial effects

以太原市地铁深基坑工程为研究背景,采用数值模拟的方法分析了同一基坑不同位置的变形规律,以及不同几何尺寸基坑的变形特点。研究结果表明:基坑围护结构的水平位移和地表沉降均存在明显的空间效应;基坑深度和宽度一定时,当长宽比大于3时,空间效应作用消失,可采用二维平面计算方法进行分析。

Taking the deep foundation pit of Taiyuan Metro as the research background,numerical simulation method was used to analyze the deformation laws of the same foundation pit at different positions,as well as the deformation characteristics of the foundation pit with different geometric dimensions.The research results indicate that there are significant spatial effects on the horizontal displacement and surface settlement of the foundation pit.When the depth and width of the foundation pit are con-stant,and the aspect ratio is greater than 3,the spatial effect disappears,and a two-dimensional plane calculation method can be used for analysis.