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| The Design and Construction of the Entrance to SubwayM ined Tunnel from Deep Foundation Pit |
| CAO Hong-ling |
| Chian Railway Siyuan Survey and DesignGroup Co., Ltd,Wuhan, Hubei 430063, China |
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Abstract Research purposes: In construction of subway tunnel in section, it is popular that the entrance to themined tunnel is directly from deep foundation pi.t For the stability of open cut deep foundation pit and the safety ofmined tunnel entrance, it is necessary to take the measures in design and construction organization. Based on the successful completion of the tunnel in the section betweenWushanPark Station andHuashiStation of line 3 ofGuangzhoumetro, in this paper, the introduction is given to the key point sof design and construction ofentrance to themined tunnel from the foundation pitand its experience can be as the reference to the similarworks.
Research conclusions:(1) For ensuring the safe construction of the entrance to the tunne,l it is necessary to take measures of reinforcing the bed ofentrance to the tunnel in advance and strengthening the primary support to the tunnel. (2) During the excavation of foundation pi,t some constructionworks for the entrance to themined tunnel can be done through reasonable construction organization fornotonly reducing the repeated works and speeding up the construction of the entrance to the tunne,l but also forensuring the stability ofopen cut foundation andmaking the tunnel safe entry.
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Received: 13 April 2009
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2009, Vol. 26 
