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.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2012年第10期2096-2102,共7页
Chinese Journal of Rock Mechanics and Engineering
关键词
隧道工程
隧道衬砌
纵向裂缝
承载力
安全系数
tunnelling engineering
tunnel lining
longitudinal cracks
bearing capacity
safety factor
