深圳地铁国-老区间重叠隧道施工引起的地表沉降规律分析

深圳地铁一期工程国贸站—老街站区间暗挖隧道设计为单洞双层重叠隧道，国内地铁工程首次采用该种特殊结构形式，隧道采用台阶法分四步开挖。根据施工地表沉降实测资料，对施工引起的地表沉降规律进行了分析，如重叠隧道施工引起地表沉降范围、沉降大小、沉降历时规律与特点等。对影响地表沉降规律的主要因素地质条件、台阶长度等进行较全面的分析，并提出了控制地表沉降的相应的对策与措施。

Analysis on Pattern of Surface Subsidence Caused by Tunnel Construction: Case Study on Guomao Station～Laojie Station Overlapped Running Tunnel on Shenzhen Metro

Guomao Station - Laojie Station mined running tunnel on phase 1 of Shenzhen Metro is designed as a single- tube overlapped two-storey tunnel. It is the first time in China that such a special tunnel structure has been adopted in Metro works. The tunnel is excavated by means of heading/bench excavation method, which includes 4 steps. In the paper, the pattern of the surface subsidence caused by tunnel construction, such as the scope of the surface subsidence caused by overlapped tunnel construction, the magnitude of the surface subsidence, the regularity and features of the surface subsidence as a function of time, is analyzed on basis of the monitoring data. The major factors influencing the surface subsidence pattern, such as the geological conditions and the bench lengths, are also thoroughly analyzed and some subsidence-controlling countermeasures are recommended in the paper.