钢支撑伺服系统在深基坑中应用及优化研究
Application and Optimization Study of Steel Support Servo System in Deep Foundation Pit
黄展军 1唐晓林 2彭俊仁 1丁海滨 2邱友根 1喻义天 2徐长节2
作者信息
- 1. 南昌轨道交通集团有限公司 南昌市 330038
- 2. 华东交通大学 江西省岩土工程基础设施安全与控制重点实验室 南昌市 330013;江西省地下空间技术开发工程研究中心 南昌市 330013
- 折叠
摘要
依托杭州武林门地铁基坑,通过实测分析和建立基坑三维结构数值模型对基坑进行数值模拟并进行优化研究.结果表明:在实际工程中,钢支撑伺服系统施加伺服轴力过于保守,未能充分利用钢支撑性能,造成资源的浪费.通过对钢支撑伺服系统施加不同的伺服轴力和减少钢支撑的数量两方面进行优化分析,得出钢支撑伺服轴力在原基础上增加600 kN控制变形效果最好;与普通预应力钢支撑相比,左侧地下连续墙水平位移由19.31 mm减少到11.95 mm,减少了 38％,右侧地下连续墙水平位移由25.44 mm减少到16.56 mm,减少了 35％;从原八道支撑基础上减少为六道支撑,通过调控支撑轴力,得到相似的基坑位移和周边环境变形,在满足变形控制的要求上又符合施工的安全性和经济性.
Abstract
Based on the foundation pit of Wulinmen Metro in Hangzhou,numerical simulation and optimization study of foundation pit are carried out through analysis of actual measurement and establishment of the three-dimensional structure numerical model of the foundation pit.The results show that in practical engineering,the servo axial force applied by the steel support servo system is conservative,which fails to make full use of the steel support performance,resulting in a waste of resources.Through the optimization analysis of the steel support servo system by applying different servo axial force and reducing the number of steel supports,it is concluded that the steel support servo axial force increased by 600 kN on the original basis has the best deformation control effect.Compared with ordinary prestressed steel supports,the horizontal displacement of the left ground wall is reduced by 38％from 19.31 mm to 11.95 mm.The horizontal displacement of the ground wall on the right is reduced by 35％from 25.44 mm to 16.56 mm.The original eight supports are reduced to six supports,and by adjusting the supporting axial force,similar foundation pit displacement and surrounding environmental deformation can be obtained,which meets the requirements of deformation control and conforms to the safety and economy of construction.
关键词
基坑工程/伺服钢支撑/实测与数值模拟/优化轴力及道数Key words
foundation pit engineering/servo steel support/real measurement and numerical simulation/optimization of axial force and number of tracks引用本文复制引用
基金项目
南昌轨道交通集团科研项目(2019HGKYB002)
浙江省重点研发项目(2021C01131)
国家杰出青年科学基金资助项目(51725802)
江西省交通运输厅科技项目(2021Z0004)
国家自然科学基金项目(51878276)
出版年
2024
NETL
NSTL
万方数据