摘要
城市地铁设计必须了解所处地区地铁隧道施工引起地表沉降的规律。文章依托深圳地铁5号线工程实例,在对其18个暗挖区间隧道庞大的地表沉降监测数据合理选取的基础上,采用数理统计方法对选取的超过22 000个数据进行了整理和分析,得到了各个暗挖区间地表沉降沿隧道纵向和横向的总体分布和变化规律。研究结果表明:在各暗挖区间中地表最大累计沉降的分布规律是不均匀的,最大的达到了688.7 mm,最小的仅有7.8 mm,平均为82.3 mm;而隧道横向地表沉降的范围也各不相同,最大为140.47 m,最小为28.63 m,平均为46.78 m;实测数据与现有规范允许的最大地表沉降控制标准差别较大,建议采用适于深圳富水复合地层地铁隧道暗挖施工地表沉降新的三级控制基准。
In urban metro design, it is necessary to understand the laws of surface subsidence caused by subway tunnel construction. Using the Shenzhen Metro Line 5 as an example, over 22,000 surface subsidence monitoring data were properly selected from 19 bored running tunnels for a statistical analysis, and the laws of the longitudinal and transverse distribution as well as the variations of the surface subsidences along the tunnel in each bored running tunnel were obtained. The resuhs show that the distribution law of the maximmn accumulative surface subsidence in each runningtunnel is uneven （with an average of 82.3mm, a maximum of 688.7mm and a minimum of only 7.8m@ and the range of transverse surface subsidence in the tunnel is different from one another （with a maximum of 140.47m, minimum of 28.63m and average of 46.78@. Because of the large differences between the measured data and the maximum surface settlement control standards allowed by existing specifications, adoption of the new three-level control baseline that is suitable for controlling the surface subsidence caused by the bored excavation of subway tunnels in water-rich mixed ground is suggested for reasons of economy and rationality.
出处
《现代隧道技术》
EI
北大核心
2014年第2期76-82,共7页
Modern Tunnelling Technology
基金
国家重点基础研究发展计划资助项目(2014CB046906)
关键词
城市地铁隧道
复合地层
地表沉降
暗挖施工
统计分析
Urban subway tunnel
Mixed ground
Surface subsidence
Bored excavation
Statistical analysis
