地铁盾构掘进对地表及建筑物沉降的影响研究——以深圳地铁16号线为例

A Study of the Influence of Shield Tunneling on Ground Surface and Building Settlement-Taking Shenzhen Metro Line 16 as an Example

研究盾构掘进对周边地表及建筑物沉降造成的影响,是软土地区盾构隧道安全施工和正常运营的基本要求.以深圳地铁16号线龙东村站—龙南站盾构区间粉质黏土层为背景,建立数值模型进行模拟计算,并与实测结果进行对比验证,研究盾构掘进对地表及建筑物沉降的影响.结果表明,右线开挖完,地表最大沉降值位于右线隧道中心线处,左线开挖完,地表最大沉降值也位于右线隧道中心线处;单线盾构掘进引起的地表横向沉降曲线均是单峰形态,双线盾构掘进引起的地表横向沉降曲线往往会呈现出双峰或多峰等形态;右线盾构开挖时,建筑物监测点沉降随盾构掘进过程呈现整体下降的趋势,左线盾构到达建筑物监测点时,建筑物监测点逐渐开始隆起,在左线盾构通过后,建筑物监测点沉降值逐渐趋于稳定.

It is a basic requirement for safe construction and normal operation of shield tunneling in soft soil area to study the influence of shield tunneling on surrounding grounds and building settlement.Taking the silty clay layer in the shield section between Longdongcun Station and Longnan Station of Shenzhen Metro Line 16 as the background,a numerical model was established to conduct simulation calculation,and the results were compared with the measured results,so as to study the impact of shield tunneling on the ground surface and building settlement.The results show that after the excavation of the right track,the maximum surface settlement is located at the center line of the right track tunnel,and after the excavation of the left track,the maximum surface settlement is also located at the center line of the right track tunnel;the surface transverse settlement curves caused by single track shield tunneling are all unimodal,while the surface transverse settlement curves caused by double track shield tunneling tend to be bimodal or multi modal;during the right line shield tunneling,the settlement of building monitoring points show an overall downward trend simultaneous with the shield tunneling process.When the left line shield reaches the building monitoring points,the building monitoring points gradually begin to rise.After the left line shield passes,the settlement value of building monitoring points gradually becomes stable.