市政技术2024，Vol.42Issue(6)：52-59,67,9.DOI:10.19922/j.1009-7767.2024.06.052
淤泥质土综合管廊基坑变形超限及支护优化研究
Research on Deformation Overlimit and Support Optimization of the Foundation Pit of Silt Soil Utility Tunnel
摘要
Abstract
Aiming at the deformation overlimit of foundation pit in silt soil utility tunnel during the construction,combined with the actual engineering,Midas GTS finite element software was used to simulate the excavation and backfilling process of the foundation pit,and the consistency between numerical simulation results and field data was verified.Then,the deformation and the stress information of the pit were extracted and analyzed to propose a green support optimization method of frame double-row steel sheet pile+steel support.The results show that both the displacement and displacement rate exceed the warning value,and the displacement rate has more warning pre-cursor for the displacement overlimit;The uplift at the bottom of the foundation pit can better reflect the deformation state of the foundation pit;When the displacement reach 55％of the total increment,it is the most dangerous stage.The full-stage deformation of the steel sheet pile presents a'bow'shape.When the excavation completes,the defor-mation of the steel sheet pile is the largest at the position about 0.5H(H is the length of the steel sheet pile);The supporting structure of frame double row steel sheet pile+steel support is adopted to effectively controls the defor-mation of the foundation pit and the retaining structure.The deformation of the steel sheet pile is cantilevered after the support optimization.The displacement is controlled within 20 mm.The proposed frame double-row steel sheet pile+steel support structure can be recycled and reused to achieve green construction.The relevant research con-clusions can provide reference for similar projects.关键词
综合管廊基坑/淤泥质土/变形超限/支护优化/钢支撑/钢板桩Key words
foundation pit of the utility tunnel/silt soil/deformation overlimit/support optimization/steel supports/steel sheet piles分类
土木建筑引用本文复制引用
王勇轩,袁长丰,李振,刘辛波,张顺哲,仲臣..淤泥质土综合管廊基坑变形超限及支护优化研究[J].市政技术,2024,42(6):52-59,67,9.基金项目
山东省重点研发计划(公益类专项)项目资助(2018GSF120005) （公益类专项）
