考虑地层厚度空间变异性的水下隧道差异变形预测  

Differential Deformation Prediction of Underwater Tunnel Considering Formation Spatial Variability

作　　者：姜育科 沈才华[2] 陈伟 方忠强 邱志康 JIANG Yuke;SHEN Caihua;CHEN Wei;FANG Zhongqiang;QIU Zhikang(Zhongjiao Tunnel Bridge(Nanjing)Technology Co.,Ltd.,Nanjing 211800,China;College of Civil Engineering and Transportation,Hohai University,Nanjing 210098,China;Huashe Design Group Co.,Ltd.,Nanjing 210014,China)

机构地区：[1]中交隧桥(南京)技术有限公司,江苏南京211800 [2]河海大学土木与交通学院,江苏南京210098 [3]华设设计集团股份有限公司,江苏南京210014

出　　处：《大连交通大学学报》2024年第4期76-82,共7页Journal of Dalian Jiaotong University

基　　金：国家自然科学基金项目(52278400)。

摘　　要：为了解决地层空间变异性等不确定因素极大地增加了水下交通隧道的隧道全寿命安全性能预测难度的问题,依托南京市定淮门隧道实际工程,通过统计分析获得了敏感性地层厚度的空间变异性累积概率分布函数,并考虑不同水压耦合作用效应,揭示了南线和北线空间变异性地层中隧道的差异变形及内力变化规律。研究结论表明:管片拱顶竖向位移随着粉细砂地层厚度累积概率和隧道周围水压的增大而增大;随着上覆粉质黏土夹粉砂层厚度累积概率的增大,管片最大水平位移也越来越大。总体上土层厚度的空间变异性对隧道的位移、错缝量、内力均有很大影响,不同的空间变异性对隧道的安全性影响规律不同,应引起重视,设计时若采用传统方法无法预知其风险,设计带有一定隐患。Based on the practical engineering of Dinghuaimen Tunnel in Nanjing,the cumulative probability distri⁃bution function of spatial variability of the thickness of sensitive strata was obtained through statistical analysis with the consideration of the coupling effect of different water pressures,and the differential deformation and internal force variation rule of the tunnel in the spatial variability stratum of the south and north lines were revealed.It is found that the vertical displacement of the segment vault is increased with the increase of the cumulative probability of the thickness of the fine sand stratum and the water pressure around the tunnel.With the increase of the cumula⁃tive probability of the thickness of the overlying silty clay and silty sand layer,the maximum horizontal displace⁃ment of the segment is increased.On the whole,the spatial variability of soil layer thickness has a great impact on the displacement,fault amount and internal force of the tunnel.Different spatial variability has a different influence on the safety of the tunnel,which should be paid attention to.If the traditional method is adopted in the design,the risk cannot be predicted,and the design has certain hidden dangers.

关 键 词：空间变异性 数值模拟 差异变形 水下隧道 累积概率 

分 类 号：U459.5[建筑科学—桥梁与隧道工程]