摘要
为研究小净距平行隧道下卧土体长期沉降规律,以上海地铁1号线人民广场站—新闸路站区间隧道为工程背景,采用ABAQUS软件建立平行隧道仿真模型。以人工激励函数模拟列车荷载,并采用反映动偏应力的长期沉降模型,结合分层总和法计算隧道及对称轴处土体沉降值,分析隧道净距、列车运营速度和隧道衬砌刚度对土体沉降的影响。结果表明:土体沉降值随列车运营次数增加呈指数增长,相较于衬砌刚度,隧道净距、列车运营速度等两种因素对土体沉降影响较大;随着净距增加,隧道长期沉降值先减小后增大,最后减小至趋于单线运营时沉降值,当净距为1.2~1.8倍隧道外径时,隧道沉降值最大;模型对称轴处土体沉降值随净距增加呈指数减小;车速越大,沉降越小,衬砌刚度越大,沉降越小。
In order to study the long-term settlement laws of the soil under the small-spaced double tunnels, double-tunnel simulation model is established by using ABAQUS software while taking Shanghai Metro Line 1 section tunnel from People’s Square Station to Xinzha Road Station as the engineering background. Dynamic deviatoric stress model for long-term settlement of soil combined with layer-wise summation method is adopted to calculate tunnel settlement and soil settlement at the axis of symmetry of the model. The influence of clear-distance, train speed and stiffness of tunnel lining on the soil settlement is analyzed. The results show that the long-term settlement of the soil increases exponentially with the increase of the number of train operations. Compared with the stiffness of the lining, both of the clear-distance and the train speed have greater impact on the soil settlement. As the clear-distance increases, the settlement decreases first and then increases, and finally decreases to the settlement value tending to single-line operation. When the clear-distance is 1.2 to 1.8 times the outer diameter of the tunnel, the tunnel settlement gets maximum value. The soil settlement at the axis of symmetry of the model decreases exponentially with the increase of the clear-distance;the tunnel settlement decreases with the increase of train speed or tunnel lining stiffness.
作者
刘羽航
徐国元
黎伟
LIU Yuhang;XU Guoyuan;LI Wei(School of Civil Engineering&Transportation,South China University of Technology,Guangzhou 510641,China)
出处
《铁道标准设计》
北大核心
2022年第2期92-97,104,共7页
Railway Standard Design
基金
国家自然科学基金项目(51508200)。
关键词
地铁
小净距平行隧道
隧道沉降
数值模拟
列车循环荷载
subway
small-spaced double tunnels
tunnel settlement
numerical simulation
train cyclic load
