摘要
求解地铁管片结构在爆炸荷载下的破坏响应时,管片结构及其周围介质在初始地应力场作用下的应力和变形状态至关重要,直接影响到地铁管片结构的抗爆炸承载能力。为解决对管片结构和周围介质的静力状态进行直接分析计算对硬件和软件要求非常高且计算较难收敛的问题,考虑到地铁管片结构纵向地层条件基本不变,将模型简化为二维模型进行计算,并将模拟计算结果映射到相应三维模型中,再考虑锚固螺栓初始预紧力的影响,求解得到了地铁管片结构的初始应力和应变状态。并对不同埋深状态的管片结构初始地应力进行了计算比较。计算表明:该方法能很好简化并解决盾构隧道复杂结构三维模型的静力分析问题。
Initial stress and strain state is an important factor for the transient response analysis of subway segmented tunnel under blast loading, since it directly influences the explosion-resistant capacity of the tunnel. Due to the existence of contact surfaces between segments, direct computation of the state with large-scale 3D model demands high- performance hardware and software and moreover the convergence of the computation is difficult. As the deformation in the longitudinal direction is much smaller than that in other directions, the initial state may be obtained based on the computation results of plane strain analysis. Nodal displacement mapping method and dynamic relaxation computation are utilized in this work. In addition, the pre-load modeling on bolts is also carried out. Furthermore, the initial states at different buried depths are computed and compared. All results indicate that this new method can solve static state problem of subway segmented tunnel in a simple and reasonable way.
出处
《土木工程学报》
EI
CSCD
北大核心
2013年第4期78-84,共7页
China Civil Engineering Journal
基金
国家自然科学基金面上项目(50978253)
国家自然科学基金创新研究群体基金:侵彻冲击爆炸效应及防护研究(51021001)
国家基础研究发展计划(973项目)(2009CB724608)
关键词
盾构隧道
初始状态
动力松弛算法
预紧力模拟
应力重分布
shield tunnel
initial stress and strain state
dynamic relaxation algorithm
pre-load modeling
stress redistribution
