ISSN 2096-4498
CN 44-1745/U
Tunnel Construction ›› 2009, Vol. 29 ›› Issue (6): 658-663.DOI: B
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WANG Guo-Xin, XIAO Long-Ge, WANG Yu-Ling
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Abstract:
Hongqihegou station on No.3 line of Chongqing mass rapid transit system is located in the central busy urban area, where the surrounding environment is complex. The maximum crosssection area of the station tunnel is 730m2, the cover of the station tunnel is 8.6m and the coverspan ratio of the station tunnel is about 0.4. Therefore, the station tunnel is a typical extrashallowcovered extralarge crosssection tunnel. Prior to commencement of the works, comparison and contrast are made on several optional excavation methods of the station tunnel and conclusion is drawn that each excavation method has its own advantages and disadvantages and that effective construction measures must be taken for each excavation method so as to achieve successful excavation. The discussions on the optional excavation methods of the station tunnel can provide reference for the construction of similar extralarge crosssection tunnels in the future.
Key words: tunnel  , station  , shallow cover  , large crosssection excavation method
CLC Number:
U 455
WANG Guo-Xin, XIAO Long-Ge, WANG Yu-Ling. Discussion on Excavation Methods of Shallowcovered Extralarge Crosssection Urban Tunnels[J]. Tunnel Construction, 2009, 29(6): 658-663.
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