繁华城区深厚淤泥质地层地铁明挖区间变形规律研究

Deformation Law of Foundation Pit in Subway in Muddy Stratum Layer in Downtown Area

为了研究深厚淤泥质条件下基坑的变形规律,依托深圳地铁在建明挖地铁隧道区间基坑工程,采用现场监测方法,通过分析在建隧道区间基坑周边复杂环境,重点研究了淤泥质黏土地层对基坑建设的影响。研究结果表明:地铁明挖区间现场监测能够及时准确地预警基坑及周边既有建(构)筑物的变形特征;地铁明挖区间基坑两侧既有市政道路路面变形随着基坑建设由西向东逐渐加剧;明挖区间同一监测断面上,同时由于淤泥质黏土蠕变作用,其侧向位移也随着时间增加而缓慢增大。

With the rapid development of the coastal cities in the east,the urban subway tunnels always need to be built near the coast. Due to the muddy stratum in the coastal strata,collapse happened a lot. Therefore with the site monitoring data,the influence of muddy stratum on foundation pit is analyzed,based on the foundation pit in subway in Shenzhen. The following conclusion could be drawn： the deformation behavior could be predicted with monitoring data,and the deformation of road near the foundation pit gets larger from west to east. The lateral deformation gets larger with the excavation be done gradually as the result of the creep of muddy stratum.