软土基坑伺服钢支撑轴力变化对相邻支撑轴力与围护结构变形的影响
文璐1,2狄宏规1,2陈金铭3郭慧吉1,2周顺华1,2
Effect of Axial Force Adjustment of Servo Steel Struts on Axial Force of Adjacent Struts and Enclosure Structure Deformation of Foundation Pit in Soft Soil
WEN LuDI HongguiCHEN JinmingGUO HuijiZHOU Shunhua
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作者信息:1.同济大学道路与交通工程教育部重点实验室，201804，上海；
2.上海市轨道交通结构耐久性与系统安全重点实验室，201804，上海；
3.宁波市轨道交通集团有限公司,315012,宁波
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Affiliation:Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, 201804, Shanghai, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2020.11.018
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中图分类号/CLCN:TU94+2
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栏目/Col:研究报告
摘要:
基于软土基坑伺服钢支撑轴力加、卸载现场试验，研究伺服钢支撑轴力变化对相邻支撑轴力及开挖变形的影响。结果表明：沿水平方向及竖向，相邻钢支撑轴力均随着调整伺服钢支撑轴力的增大而减小，随着调整支撑的减小而增大，且成线性关系，水平方向上的影响范围为10 m左右；合理增大伺服钢支撑轴力可以有效地控制围护结构变形，但支撑轴力过大时，会使围护结构的侧移分布模式向“踢脚型”发展；在两道伺服钢支撑中间设置普通钢支撑，会使普通钢支撑轴力较小。
Abstracts:
The effect of the axial force adjustment of the servo steel struts on the axial forces of adjacent struts and excavation deformation of the foundation pit is investigated based on the field test of axial force adjustment of servo steel struts. The results show that, along the horizontal and vertical directions, the axial force of adjacent steel struts decreases with the increase of axial force of the adjusted servo steel strut, and increases with the decrease of adjustment, displaying linear relationship with influence range of maximum 10 meters vertically. The enclosure structure deformation can be effectively controlled by reasonably increasing the axial forces of the servo steel struts. However, the enclosure structure will develop “kick-type” deformation under excessive axial force of the struts. Setting up ordinary steel strut between two servo steel struts has smaller axial force.
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