摘要
基于弹性板理论,考虑板壳剪切变形的影响,将隧道作为弹性地基上的柱壳,采用弹性柱壳理论及简化三角函数表达的地基位移函数,经理论推导,提出将盾构管片隧道刚度离散为显式的环向剪切刚度及径向剪切刚度,并从理论上计算分析和探讨板壳弯曲刚度和剪切刚度对隧道横断面结构内力的影响,得出提高隧道切向剪切刚度能够改善纵向结构传力性能,减少横向弯曲变形等重要结论;提出在软弱地层中,隧道横向采用一定刚度的柔性设计,而隧道纵向则采用一定柔度的刚性设计的设计思想,这对于优化现行隧道纵、环向刚度设计具有指导意义,是隧道纵向剪切传递理论的一个重要补充。
Based on the elastic plate theory, taking the influence of shear deformation into consideration, tunnel is regarded as the cylindrical shell on elastic foundation. By applying the theory of elastic cylindrical shell and simplified circular function, the overall stiffness of segment tunnel is separated as circumferential and radial shear stiffness and their effects on the deformation and internal forces are analyzed. The results show that it can improve the tunnel longitudinal structure behavior and reduce the bending moment of tunnel cross section by raising the stiffness of circumferential shear stiffness. It is suggested that a flexible ring with an appropriate stiffness should be applied in cross section design and a rigid design with certain flexibility in longitudinal section in soft ground. The conclusions are an important supplement for the theory of tunnel longitudinal shear transfer, which benefits to the optimization of the tunnel design.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2006年第7期1486-1493,共8页
Chinese Journal of Rock Mechanics and Engineering
关键词
隧道工程
纵向剪切
弹性地基柱壳
三角位移函数
剪切刚度
tunneling engineering
, longitudinal shear
cylindrical shell on elastic foundation
triangular displacement function
shear stiffness
