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预留变形量指满足隧道净空及结构尺寸外,还得考虑初期支护变形的情况,这种预留的变形是隧道初期支护允许和合理的。对于二车道Ⅴ级围岩预留变形量的大小在《公路隧道设计规范》(2004)有明确规定,即结合实际埋置深度、施工方法和支护情况等,预留80n m～120m m。对于易产生大变形的黄土隧道,规范所规定的上限值120m m预留变形量在特定隧道情况下不能满足初期支护变形要求,后期二衬施工易产生侵限情况。
Reserved deformation refers to meet the tunnel clearance and structure dimensions, but also have to consider the initial deformation of the support, the reservation of the deformation of the initial tunnel support allows and reasonable. For the second-lane Ⅴ grade rock reserves the size of the deformation in the “Highway Tunnel Design Code” (2004) has made it clear that the combination of the actual depth of embedding, construction methods and support conditions, set aside 80n m ~ 120m. For loess tunnels prone to large deformations, the prescribed deformation limit of 120m m can not meet the requirements of initial support deformation under certain tunnel conditions, and the subsequent construction of the second lining tends to create intrusion.