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基于Clough系统刚度,提出一种可综合考虑内撑式基坑围护墙、内支撑和墙后土体刚度的支护体系综合刚度表达式,以较好地预测基坑变形。将Clough支护刚度、Bolton支护刚度和文中综合支护刚度应用于天津地铁6号线22个基坑工程469个围护墙测斜案例中,结果表明,基坑围护结构最大变形随着无量纲综合支护体系刚度(η?)的增大而减小,当η?增大到一定值后,其变形值趋于恒定。进一步分析土体不排水抗剪强度调动率,得到天津地铁6号线地铁基坑墙后土体调动率不大于0.6,远小于上限值0.8,说明天津地铁基坑建设具有足够的安全储备。研究成果可为同类工程经济性和安全性设计提供借鉴。
Based on the stiffness of the Clough system, a comprehensive stiffness formula of the retaining system considering the stiffness of the retaining wall, the inner support and the soil behind the retaining wall is proposed to predict the deformation of the foundation pit well. The application of Clough retaining stiffness, Bolton retaining stiffness and comprehensive support stiffness in the text to 469 cases of wall fencing in 22 excavations in Line 6 of Tianjin Subway project shows that the maximum deformation of the retaining structure of foundation pit varies with The stiffness of the dimensionless composite support system decreases with the increase of the η (η). When η increases to a certain value, the deformation value tends to be constant. Further analysis of soil undrained shear strength transfer rate, get Tianjin Metro Line 6 subway foundation pit wall soil mobilization rate of not more than 0.6, much less than the upper limit of 0.8, indicating that the construction of Tianjin Metro Foundation pit has sufficient safety reserves. The research results can provide reference for engineering economics and safety design of similar projects.