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8 盾构的导向与纠偏(调向)在盾构推进过程中,盾构的位置决定着在其掩护下进行的隧道衬砌的位置.所以推进盾构需要有一定精确度与执行谨慎的操作过程.盾构在推进行程中会受到一些阻力,其中包括有:由于盾构表面与地层间的摩擦而引起的阻力:由于地层施加在开挖支撑面上的压力而引起的阻力以及切口环切削欠挖地层所引起的阻力,这些阻力的大小在隧道周边上以及开挖面各处都是不相同的,所以在盾构推进时,会不可避免地要发生一定的偏斜.
8 Guidance and Correction of Shields (Tunneling) During the process of shield advancement, the position of the shield determines the position of the tunnel lining under its cover. Therefore, the advancement of the shield requires certain accuracy and prudent operation procedures. Shields are subject to some resistance during advancement strokes, including resistance due to friction between the surface of the shield and the formation: resistance due to pressure exerted by the formation on the excavation support surface, and cutting of the notch ring The resistance caused by under-digging formations is not the same in the periphery of the tunnel and in the excavation surface. Therefore, when the shield advances, it will inevitably occur a certain deflection.