钢套管施工对地铁隧道影响分析及变形控制研究

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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.

Key words： tunnelling engineering steel casing mechanical pressure soil column plugging critical height deformation and displacement

Received: 28 April 2012

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https://rockmech.whrsm.ac.cn/EN/Y2013/V32/Is2/3584

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