超深地铁基坑开挖围护结构的变形分析

Deformation Analysis of Enclosure Structure of Ultra-deep Subway Foundation Pit Excavation

文中通过对超深地铁基坑开挖围护结构变形数据的分析可知,随着基坑的开挖,地连墙的水平位移随开挖深度的增大而增大,呈现出中间大、两头小的“弓”字型。基坑标准段处,地连墙最大水平位移与开挖深度的比值介于0.069%与0.397%,均值为0.213%;端头井处,地连墙最大水平位移与开挖深度的比值介于0.030%与0.228%,均值为0.093%。基坑开挖深度与地连墙最大水平位移值所在深度呈双曲线关系。

Based on the analysis of deformation data of the enclosure structure of ultra-deep subway foundation pit excavation,the following results are obtained:With the excavation of foundation pit,the horizontal displacement of underground diaphragm wall increases with the increase of excavation depth,showing a"bow"type with large middle and small two ends.At the standard section of foundation pit,the ratio of the maximum horizontal displacement of the underground diaphragm wall to the excavation depth is between 0.069%and 0.397%,and the average value is 0.213%;At the end well,the ratio of the maximum horizontal displacement of the diaphragm wall to the excavation depth is between 0.030%and 0.228%,and the average value is 0.093%.The relationship between the excavation depth of foundation pit and the depth of the maximum horizontal displacement of the diaphragm wall is hyperbolic.