杭州地铁1号线越江隧道累积沉降研究

Study on Cumulative Settlement of Cross-River Tunnel of Hangzhou Metro Line 1

列车荷载作用下软土地区盾构隧道的长期沉降问题不容忽视。针对杭州地铁1号线越江隧道工程,基于经验拟合的理论计算公式,并结合动三轴试验、有限元分析等手段,计算分析隧道下卧土层的不排水循环累积塑性变形和累积孔压消散引起的固结变形;采用分层总和法对隧道的车载累积沉降进行计算,分析得到隧道的长期沉降规律,以期为隧道的长期沉降控制提供指导。

Taking the cross-river tunnel project on Hangzhou metro line 1 as an example, based on theoretical calculation formula combination experience, with dynamic tri-axial test methods, and finite element analysis etc, the paper makes computation and analysis on un-drained cyclic accumulation plastic deibn-nation of tunnel sub-soil and concretion deformation caused by cumulative pore pressure dissipation. Using hierarchical summation method for calculation of tunnels cumulative subsidence under train load, the analysis works out the tunnel long-term settlement pattern, providing guidance for tunnel long-term subsidence control.