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一、概述延安东路越江隧道采用网格式盾构施工,盾构开挖必然会有土体损失Vs,Vs=V-Vo,V为施工开挖掉的土体体积,Vo为隧道所占的体积,土体损失使隧道周围的土层位移,使地表产生沉降,遇到复杂地层时,盾构正面若失稳,大量土体拥入盾构,对地面建筑物会造成严重的后果。另外,这种盾构在推进时会挤压、扰动地基的相应土层,还可能产生地表隆起或出现主动破坏区;在盾构通过之后,受挤压、扰动的土体会产生固结沉降现象,因此使地表
I. Overview The Yan’an East Road Crossing River Tunnel adopts the grid-type shield construction. The shield tunneling will inevitably have soil loss Vs, Vs = V-Vo, where V is the soil volume excavated from the construction, Vo is the tunnel Volume and soil loss displace the soil layer around the tunnel, causing the surface to settle. When faced with complex strata, if the front of the shield is not stable, a large amount of soil will enter the shield, which will cause serious consequences to the ground structure. In addition, the shield will be squeezed when advancing, perturbing the corresponding foundation soil, may also produce surface uplift or active destruction zone; after the shield through the extrusion, disturbed soil will have consolidation settlement phenomenon , So make the surface