非均质地层隧道竖向荷载计算方法研究  

Research on the Calculation Method of Vertical Load Acting on Tunnels in Inhomogeneous Strata

作　　者：门小雄 李政国 姜弘 任辉 包鹤立 Men Xiaoxiong;Li Zhengguo;Jiang Hong;Ren Hui;Bao Heli(Zhuhai Rail Transit Co.,Ltd.,Zhuhai 519060,Guangdong,P.R.China;Department of Geotechnical Engineering,Tongji University,Shanghai 200092,P.R.China;State Key Laboratory of Geotechnical and Underground Engineering,Ministry of Education,Shanghai 200092,P.R.China;Shanghai Urban Construction Design&Research Institude(Group)Co.,Ltd.,Shanghai 200125,P.R.China)

机构地区：[1]珠海市轨道交通有限公司,广东珠海519060 [2]同济大学地下建筑与工程系,上海200092 [3]教育部岩土与地下工程重点实验室,上海200092 [4]上海市城市建设设计研究总院(集团)有限公司,上海200125

出　　处：《地下空间与工程学报》2023年第5期1444-1453,共10页Chinese Journal of Underground Space and Engineering

基　　金：上海市科委科研计划项目(19DZ1200903);珠海交通集团有限公司科技项目(2320004000294)。

摘　　要：隧道穿越非均质地层时,由于土层物理力学性质差异较大,经典太沙基理论计算得到的竖向荷载与实际误差较大。基于经典太沙基理论,建立了一种基于折线滑动面的非均质地层隧道竖向荷载计算方法,针对软弱土层在隧道断面上方和隧道穿越软弱土层两类工况,考虑5种穿越场景,推导了非均质地层隧道竖向土压力计算公式。通过与珠海隧道、狮子洋隧道的现场实测土压力值进行对比,验证了所提出方法的正确性。通过对软弱土层内摩擦角、厚度和与隧道相对位置等参数进行敏感性分析,并与太沙基理论及直线滑动面模型的计算结果对比,明确了非均质地层隧道竖向荷载随软弱地层关键参数的变化规律。When the tunnel passes through inhomogeneous strata,due to the sharp difference in the physical and mechanical properties between different strata,the vertical load acting on tunnels calculated by the classic Terzaghi theory deviates significantly from the real situation.Based on the classic Terzaghi theory,the paper proposes a new calculation method of vertical load acting on tunnels in inhomogeneous strata by assuming the sliding plane as poly straight lines.Considering five tunnel-crossing scenarios,the calculation formulae of vertical load are derived for the case when the soft layer is above the tunnel and the case when the tunnel passes through the soft layer,respectively.The proposed model is validated by comparing with the earth pressures measured in the Zhuhai Tunnel and Shiziyang Tunnel projects.The variational law of vertical load acting on tunnels in inhomogeneous strata with the key parameters of soft layer is obtained through parametric studies on the internal friction angle,thickness and position relative to tunnel of the soft layer and by comparing with the calculation results of the classic Terzaghi model and the straight sliding plane model.

关 键 词：隧道 非均质地层 竖向荷载 现场试验验证 计算方法 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]