广东水利水电Issue(1)：31-38,8.
TBM引水隧洞组合结构联合承载特性及荷载分担率研究
Study on Combined Bearing Characteristics and Load Sharing Ratio of TBM Diversion Tunnel Composite Structure
摘要
Abstract
In order to explore the influence of the combined bearing characteristics of the TBM headrace tunnel under the condition of Class V surrounding rock and the study of the load sharing rate,based on the finite element software and relying on the Rong jiang Guan bu headrace tunnel project,a three-dimensional calculation model is established to carry out the construction excavation and stress of the segments,and the characteristics of the calculation results are analyzed.The results show that the vertical settlement value of the surface section gradually increases from the beginning to the end of the TBM tunnel excavation,and the beginning and end of the excavation are relatively dangerous stages,so attention should be paid to monitoring in practical projects;The vertical displacement and maximum compressive stress of the segment in the combined bearing of the composite structure are smaller than the segment alone bearing,and the maximum compressive stress of the segment under external pressure is 18.22MPa,which meets the corresponding specification requirements;Under the control of external pressure,the load is mainly borne by segments,and the steel ring and anchor bolt are used as reserve force to share the load,of which 93.06％is shared by segments,6.11％is shared by inner tensioned steel ring,and 0.84％is shared by anchor bolt.Therefore,the composite structure can provide a reference for the safety design of segments in the headrace tunnel project.关键词
组合结构/有限元/施工开挖/管片应力/荷载分担Key words
composite structure/finite element/construction excavation/segment stress/load sharing分类
建筑与水利引用本文复制引用
方腾卫,杨孟,张建伟,陈磊,曹克磊..TBM引水隧洞组合结构联合承载特性及荷载分担率研究[J].广东水利水电,2024,(1):31-38,8.基金项目
水工岩石力学教育部重点实验室开放基金项目(编号:RMHSE1902) （编号:RMHSE1902）
广州市基础研究计划项目(编号:202002030467). （编号:202002030467）
