(1. Department of Civil Engineering，Beijing Jiaotong University，Beijing 100044，China；2. China Construction Eighth
Engineering Division Cop.，Ltd.，Shanghai 200135，China)
Abstract：The largest cross-sectional area of Hongqihegou Station in Chongqing Metro third line has reached 760 m2. The shallow station tunnel is located in urban area，the engineering condition is very complex. The tunnel is shallow buried and the ratio of depth to span is small(only 0.4). By comparing different methods，a new excavation method named reserved cross rock beam-pillar is proposed；and the parameters are optimized with numerical analysis. The rock pillar is 8 m of width and the rock pillars excavation is 1 m of length. The surface subsidence and section convergence are monitored which are caused by the tunnel construction. The surrounding rock is stable during excavation，which proves that the proposed method is feasible in practice. Through the monitoring，the displacements law caused by construction process is researched. The result can provide experience to similar projects.
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2013, Vol. 32 
