CAJ | 학술논문

为了减小钢套管施工对地铁隧道变形及位移的影响，施工前需对钢套管的旋进过程进行分析。通过数值模拟得到对隧道影响较大的旋进深度和不同旋进深度下作用于钢套管的最大机械下压力，以此下压力配合旋压机械上的油压表来严格控制钢套管的旋入过程。现场实测结果表明：当钢套管旋进到隧道水平轴线以下时，管内土柱达到临界高度并发生闭塞，从而挤压套管下部土体，导致隧道上浮、偏移，并产生椭圆形变形。为了严格控制施工期间隧道的变形量及位移量，本文提出在隧道旁打设应力释放孔来减小钢套管旋进时对隧道的挤压影响，或选择合理施工顺序来减小超孔隙水压力对地铁隧道的影响。
위료감소강투관시공대지철수도변형급위이적영향，시공전수대강투관적선진과정진행분석。통과수치모의득도대수도영향교대적선진심도화불동선진심도하작용우강투관적최대궤계하압력，이차하압력배합선압궤계상적유압표래엄격공제강투관적선입과정。현장실측결과표명：당강투관선진도수도수평축선이하시，관내토주체도림계고도병발생폐새，종이제압투관하부토체，도치수도상부、편이，병산생타원형변형。위료엄격공제시공기간수도적변형량급위이량，본문제출재수도방타설응력석방공래감소강투관선진시대수도적제압영향，혹선택합리시공순서래감소초공극수압력대지철수도적영향。
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.