摘要
为探究TBM(Tunnel Boring Machine)高埋深引水隧洞中组合结构在拼接成环管片错台和张开度的影响,基于有限元软件,依托榕江关埠引水隧洞建立计算模型,开展组合结构在不同工况下组合结构的受力和变形状态、管片的错台和张开度的研究。结果表明:组合结构联合承载中管片的最大压应力均小于管片单独承载;组合结构有效抑制管片的变形,相比于管片结构,组合结构的管片三方向位移值降低了11.2%~20.5%;组合结构中内张钢圈和化学螺栓的Mises应力分别为80.7 MPa、15.48 MPa;组合结构有效抑制了管片的张开度和错台发展,且错台减小较为明显,减小了49%,在最不利工况下,管片接缝处张开度和错台最大量分别达到0.029 mm、0.220 mm,可为类似的引水隧洞工程设计和施工提供参考。
In order to explore the influence of the composite structure in the TBM high buried headrace tunnel that is spliced into a ring segment at the bottom,based on the finite element software and relying on the Rong jiang Guan bu headrace tunnel,a calculation model is established to carry out the research on the stress and deformation state of the composite structure under different load conditions,the dislocation and opening of the segment.The results show that the maximum compressive stress of the segment in the combined bearing capacity of the composite structure is less than that of the segment alone;The combined structure can effectively restrain the deformation of the segment.Compared with the segment structure,the three-dimensional displacement of the segment of the combined structure decreases by 11.2%~20.5%;The Mises stress of the inner tensioned steel ring and chemical bolt in the composite structure is 80.7MPa and 15.48MPa respectively;The combined structure effectively inhibits the opening and stagger development of the segment,and the stagger decreases significantly,reducing by 49%.Under the most unfavorable working conditions,the opening and stagger at the segment joint reach 0.029mm and 0.220mm respectively,it can provide reference for the design and construction of similar diversion tunnel works.
作者
方腾卫
冯日荣
张建伟
陈磊
曹克磊
FANG Tengwei;FENG Rirong;ZHANG Jianwei;CHEN Lei;CAO Kelei(Guangdong Hydropower Planning&Design Institute Co.,Ltd.,Guangzhou 510170,China;Guangdong Huasui Construction Group Co.,Ltd.,Guangzhou 510228,China;School of Water Conservancy,North China University of Water Resources and Electric Power,Zhengzhou 450046,China)
出处
《广东水利水电》
2023年第11期1-8,共8页
Guangdong Water Resources and Hydropower
基金
水工岩石力学教育部重点实验室开放基金(编号:RMHSE1902)
广州市基础研究计划(编号:202002030467)。
关键词
引水隧洞
组合结构
错台和张开度
联合承载
headrace tunnel
composite structure
numerical simulation
segment
