TBM引水隧洞施工模拟管片力学特性影响因素分析  

Analysis of Factors Influencing Mechanical Characteristics of TBM Diversion Tunnel Construction Simulation Segments

作　　者：陈磊 张建伟 李火坤[2] 杨帆[3] 郭新蕾[3] 张文远[3] 黄伟[2] CHEN Lei;ZHANG Jianwei;LI Huokun;YANG Fan;GUO Xinlei;ZHANG Wenyuan;HUANG Wei(School of Water Conservancy,North China University of Water Resources and Electric Power,Zhengzhou 450046,China;Engineering and Construction College,Nanchang University,Nanchang 330031,China;China Institute of Water Resources and Hydropower Research,Beijing 100048,China)

机构地区：[1]华北水利水电大学水利学院,郑州450046 [2]南昌大学工程建设学院,南昌330031 [3]中国水利水电科学研究院,北京100048

出　　处：《广东水利水电》2024年第2期27-33,39,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项目(编号:RMHSE1902);广州市基础研究计划项目(编号:202002030467)。

摘　　要：为探究不同影响因素对引水隧洞施工过程管片位移和应力的影响,以榕江-关埠引水隧洞工程典型区间段为例,建立“围岩-管片-内张钢圈”组合结构的三维精细化有限元模型,模拟引水隧洞工程的施工开挖过程,研究隧洞埋深、围岩类型和注浆体刚度3个因素对施工期管片力学特性的影响。结果表明:TBM引水隧洞施工开挖过程中管片位移随着开挖环数增加而逐渐增大,减小隧洞埋深、增强围岩类型(Ⅴ类→Ⅱ类)和增强注浆属性将会降低管片的位移,其最大值分别为1.670 mm、1.406 mm和1.863 mm;管片压应力随开挖环数增加而逐渐增大,拉应力呈先减小后增加的趋势;增大隧洞埋深、降低围岩类型(Ⅱ类→Ⅴ类)和削弱注浆属性将会增加管片的应力,其中管片压应力最大值分别为5.765 MPa、4.833 MPa和6.165 MPa,均满足规范要求。在实际工程中,建议对埋深大和围岩质量差的隧洞工程重点监测,研究结果可为类似的引水隧洞工程提供参考。To explore the effects of different influencing factors on the displacement and stress of the segments during the construction process of the diversion tunnel,a three-dimensional refined finite element model of the"surrounding rock-segment-inner tensioned steel ring"composite structure was established using a typical section of the Rongjiang Guanbu diversion tunnel project as an example.The excavation process of the diversion tunnel project was simulated,and the effects of tunnel burial depth,surrounding rock type,and grouting stiffness on the mechanical properties of the segments during the construction period were studied.The results show that during the excavation process of TBM diversion tunnel construction,the displacement of the pipe segment gradually increases with the increase of the number of excavation rings,reducing the burial depth of the tunnel,enhancing the type of surrounding rock(Class V→Class II),and enhancing the grouting properties will reduce the displacement of the pipe segment,with maximum values of 1.670mm,1.406mm,and 1.863mm,respectively,the compressive stress of the pipe segment gradually increases with the increase of the number of excavation rings,while the tensile stress shows a trend of first decreasing and then increasing,increasing the burial depth of the tunnel,reducing the type of surrounding rock(Class II→Class V),and weakening the grouting properties will increase the stress of the pipe segment.The maximum compressive stress values of the pipe segment are 5.765MPa,4.833MPa,and 6.165MPa,respectively,which meet the requirements of the specifications.In practical engineering,it is recommended to focus on monitoring tunnel projects with large burial depth and poor surrounding rock quality.The research results can provide reference for similar diversion tunnel projects.

关 键 词：引水隧洞 施工模拟 管片力学特性 影响因素 

分 类 号：TV672.1[水利工程—水利水电工程]