摘要
基于FLAC3D有限差分软件建立了包括地裂缝和地铁隧道的数值模拟模型,分析了从下向上、从左向右和从右向左三种渗流方式使地下水位上升不同的高度对地裂缝场地地铁隧道的影响。发现随着地下水位的上升,地表回弹量不断增大,在地裂缝和地铁隧道对应的地表附近存在回弹位移减小区,相比于其他两种渗流方式,从下向上渗流引起的地表位移值最大;隧道衬砌内力受渗流方式及水位上升区间的影响而变化,10 m处为转折点;隧道衬砌水平位移增量呈线性不断增长,竖向位移增量呈先增大后减小的趋势,从左向右渗流方式对隧道衬砌水平位移的影响最大。
Based on the FLAC3D finite difference software,a numerical simulation model including ground fissures and subway tunnels was established,and three seepage methods from bottom to top,from left to right and from right to left were analyzed to make the groundwater level rise to different heights on the ground fissure site subway tunnel Impact.It is found that as the groundwater level rises,the amount of ground rebound continues to increase,and there is a reduced rebound displacement near the ground fissures and subway tunnels.Compared with the other two seepage methods,the ground surface displacement value caused by seepage from bottom to top is the largest,the internal force of the tunnel lining changes due to the seepage mode and the rising interval of the water level,and the turning point is at 10 m,the horizontal displacement increment of the tunnel lining continuously increases linearly,and the vertical displacement increment first increases and then decreases.The seepage mode from left to right has the greatest impact on the horizontal displacement of the tunnel lining.
作者
武昭
Wu Zhao(Tongji University,Shanghai 200092,China)
出处
《山西建筑》
2021年第9期127-129,共3页
Shanxi Architecture
关键词
地裂缝场地
水位上升
地铁隧道
数值模拟
ground fissure site
water level rise
subway tunnel
numerical simulation
