Abstract：In order to reduce the effect of steel casing construction on deformation and displacement of metro tunnel，the procession of steel casing is need to be analyzed before construction. The depth of precession which affects tunnels seriously and the maximum mechanical pressure in different precession depths are obtained by numerical simulation. With the help of maximum mechanical pressure and oil pressure gauge，the precession of steel casing is strictly controlled. The field test data shows that when steel casing is under the horizontal axis of the tunnel，the height of soil column reaches the critical height and the plugging has happened. Then，the soil column begins to squeeze the lower soil and lead to the tunnel uplift，offset and produce elliptical deformation. In order to strictly control the deformation and displacement of the tunnel during the steel casing construction，the method of setting up holes beside the tunnels to relax the squeezing stress during the precession，or choosing a reasonable construction sequence to reduce the effects of excess pore water pressure on the tunnel is proposed.
吉茂杰，刘国彬. 开挖卸荷引起地铁隧道位移的预测方法[J]. 同济大学学报：自然科学版，2001，29(5)：531-535.(JI Maojie，LIU Guobin. Prediction method of displacement of subway tunnel due to excavation[J]. Journal of Tongji University：Natural Science， 2001，29(5)：531-535.(in Chinese))
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2013, Vol. 32 
