作　　者： ; ; ;

机构地区： 同济大学

出　　处： 《岩石力学与工程学报》 2012年第10期2096-2102,共7页

摘　　要： 基于隧道衬砌拱顶结构1∶1的荷载试验,建立衬砌裂缝深度与衬砌刚度的关系,提出裂缝处衬砌刚度计算的梁弹簧模型。基于梁弹簧模型分析裂缝位置、裂缝深度和地层抗力对衬砌结构承载力的影响。计算结果表明:隧道拱顶安全系数随裂缝深度增加呈线性降低,裂缝深度为衬砌厚度的50%时,安全系数则降低78%;相同裂缝深度情况下,裂缝在拱顶时最不利,裂缝在拱腰、边墙以及拱脚时对结构安全系数影响较小;地层抗力对拱顶、边墙以及拱腰的安全系数影响较大,对拱脚的安全系数影响较小。 Based on 1 ： 1 load test of the tunnel lining vault, the relationship between lining crack depth and lining stiffness is established： and a beam-spring model is put forward to calculate the stiffness of lining crack. Using the beam-spring model, the effects of crack location, crack depth and strata resistance on bearing capacity of lining structure are analyzed. The calculation results show that the tunnel vault safety factor reduces linearly with the increasing crack depth： when crack depth is 50% of lining thickness, the safety factor is reduced by 78%. Under the same crack depth, cracks in the vault are most disadvantageous; cracks in the arch of the waist, side wall or arch foot, the influence on safety factor is smaller. The effects of strata resistance on safety factor of the vault, side walls and arch waist are larger; but the effect on safety factor of the feet of arch is smaller.

关 键 词： 隧道工程 隧道衬砌 纵向裂缝 承载力 安全系数

领　　域： [建筑科学] [交通运输工程]