河床冲淤对越江盾构隧道管片内力及变形的影响  

Influence of river channel scouring and silting on internal force and deformation of segments in shield tunnels across rivers

作　　者：李方利 李雪[2] LI Fangli;LI Xue(China Railway Construction Kunlun Metro Investment and Construction Management Co.,Ltd.,Chengdu 610041,China;College of Earth Science and Technology,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]中铁建昆仑地铁投资建设管理有限公司,四川成都610041 [2]西南石油大学地球科学与技术学院,四川成都610500

出　　处：《人民长江》2022年第11期119-124,共6页Yangtze River

摘　　要：河床冲刷淤积对越江盾构隧道的内力及变形影响显著,是越江盾构隧道设计的关键因素。以南京地铁3号线大直径越江隧道工程为背景,详细分析了长江深切槽段水位变化及河床冲淤演变对越江盾构隧道的影响。以300 a一遇冲刷线和100 a一遇洪水及枯水期水位为相关工况,基于梁-弹簧模型计算了冲刷前后及典型水位组合工况下管片内力及接头变形量。研究结果表明:水位的变化对盾构隧道管片弯矩的影响较小,而河床冲刷使管片内力有很大程度的降低,最大正负弯矩降幅平均达到56%。管片接头最大弯矩及最大张开量均发生在洪水水位、未冲刷工况。研究成果可为类似越江盾构隧道工程提供借鉴。River channel scouring and silting significantly influence internal force and deformation of segments in shield tunnels,which is a key parameter in design of shield tunnels across rivers.Based on the large diameter cross-river tunnel project of Nanjing Metro Line 3,the influences from variation of water level and the riverbed scouring and silting of a deep trough in the Yangtze River on the shield tunnel are analyzed in detail.Setting the 300-year scouring line and 100-year flood and dry water levels as working cases,the internal force and joint deformation of the segments before and after scouring are calculated based on the beam-spring calculation model.The results show that the change of water level has limited effect on the bending moment of shield tunnel segments,while the riverbed scouring reduces the internal forces of segments obviously,in which the maximum positive and negative bending moments decrease by 56%on average.The maximum bending moment and maximum opening of segment joint appear in case of flood level without scouring.The research results can provide reference for similar projects.

关 键 词：越江隧道 盾构管片 管片内力 冲刷淤积 水位变化 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]