摘要
当高速列车通过隧道时,其周围所产生的气压波不可避免地对轨旁电力附属设施造成气动冲击影响。配电箱作为一种隧道内广泛分布的轨旁电力附属设施,在气动荷载作用下,其锚固安全性会受到一定影响。以配电箱为研究对象,利用Abaqus与Fluent进行联合仿真分析其结构安全性。利用流体力学计算软件Fluent,建立空气−高速列车−隧道三维CFD数值计算模型,得到了气动荷载时程曲线;基于Abaqus有限元计算软件,建立配电箱−锚栓−隧道结构的三维精细化有限元模型,研究气动−地层荷载联合作用下配电箱、锚栓与衬砌的动力响应特性以及高速铁路隧道轨旁配电箱的破坏模式与影响因素。研究结果表明:在气动−地层荷载联合作用下,相对于配电箱以及锚栓本身,锚栓安装基座的衬砌表层混凝土最容易发生破坏;混凝土的破坏形状呈现以锚栓中心为轴线的表层椎体分布特征,混凝土潜在破坏模式为渐进式剥离破坏与黏结破坏;混凝土内拉应力与锚栓直径呈现明显的负相关性,为避免因混凝土破坏而造成配电箱脱落等安全事故,可适当提高锚栓直径。
When the high-speed train passes through the tunnel,the air pressure wave generated around high-speed train would inevitably cause aerodynamic impact on the trackside power auxiliary facilities.As a widely distributed trackside power auxiliary facility in the tunnel,the anchorage safety of distribution box is affected by aerodynamic load.By taking the distribution box as the research object,commercial Abaqus®and Fluent®software programs were used for coupled simulations to analyze its structural safety.The three-dimensional(3D)CFD numerical model of the air-high-speed train-tunnel systemwas established by using the hydrodynamics software program Fluent®,and the time-history curves of theaerodynamic load wereobtained.Then,based on finite element software program Abaqus®,the refined 3D finite element model the distribution box-anchor-tunnel system was established,and the characteristics of dynamic responses of the distribution boxes,anchors,and lining under the coupling effect of aerodynamic ground load were studied.The failure mode and influencing factors of trackside distribution box in high-speed railway tunnel were studied.The results show that under the coupling effect of aerodynamic and ground loads,the lining surface concrete of the anchor installation base is most likely to be damaged as compared with the distribution boxes and the anchors themselves;the failure shape of concrete presents the distribution characteristics of surface vertebral bodies with the anchor bolt center as the axis,and the potential failure modes of concrete are progressive peel failure and bond failure.There is an obvious negative correlation between the internal tensile stress of concrete and the diameter of anchor.To avoid safety accidents such as falling-offdistribution boxes caused by concrete damage,the diameter of anchor bolt can be appropriately increased.
作者
曹宏凯
施成华
杨伟超
邓锷
何洪
CAO Hongkai;SHI Chenghua;YANG Weichao;DENG E;HE Hong(School of Civil Engineering,Central South University,Changsha 410075,China)
出处
《铁道科学与工程学报》
EI
CAS
CSCD
北大核心
2022年第4期874-882,共9页
Journal of Railway Science and Engineering
基金
国家自然科学基金资助项目(51978670)
国铁集团科技开发项目(K2019G041)。
关键词
联合仿真
气动荷载
配电箱
锚栓
二次衬砌
破坏形状
coupled simulation
aerodynamic load
distribution box
anchor
secondary lining
failure shape
