河北工业科技2026，Vol.43Issue(2)：126-137,12.DOI:10.7535/hbgykj.2026yx02004
应用伺服钢支撑的超深盖挖逆作基坑变形分析
Deformation analysis of ultra-deep excavation with reverse construction foundation pit using servo steel supports
摘要
Abstract
To clarify the application effect of the servo support system in top-down excavationreverse foundation pit and meet the requirements for refined design and construction of ultra-deep top-down excavation reverse foundation pit in soft soil areas,this study took Xiawafang Station of Tianjin Metro Line 8 as a case study.The deformation characteristics of an ultra-deep top-down excavation in soft soil supported by servo steel supports were investigated based on field monitoring data.The results show that the deep horizontal displacement of the diaphragm wall increases in stages with excavation depth,with a maximum horizontal displacement of approximately 40 mm.After the installation of servo steel supports,the average increment of deep horizontal displacement in the servo-controlled area is close to 0 mm,while the maximum increment in the passive support area of the standard section reaches about 15 mm,indicating that servo steel supports can effectively restrain the deformation of the diaphragm wall and reduce the deformation differences along the excavation.The vertical displacement of the wall is significantly influenced by the construction sequence,and the uplift of the earlier excavated area is about 30%～40%larger than that of the later excavated area.The maximum ground surface settlement around the excavation is about 25 mm,which is approximately 0.6 times the maximum horizontal displacement of the diaphragm wall.The maximum settlement occurs at a distance of 5～15 m from the edge of the excavation.The results provide data support for the design and construction of servo support systems in ultra-deep top-down excavations in soft soil areas.关键词
地下工程/伺服钢支撑/逆作法基坑/基坑变形/案例分析Key words
underground engineering/servo steel support/reverse construction foundation pit/foundation pit deformation/case analysis分类
建筑与水利引用本文复制引用
仲志武..应用伺服钢支撑的超深盖挖逆作基坑变形分析[J].河北工业科技,2026,43(2):126-137,12.基金项目
中铁建交运集团有限公司科研计划课题(2024-03) （2024-03）
