摘要
研究目的:随着我国的基础设施建设趋于完善,新建铁路常需要跨越既有构筑物。当新建高速铁路以路基形式跨越地铁隧道时,合理评价列车运行振动对地铁及路基结构的影响,具有重要的工程实用意义。本文以沪杭客专采用桩板结构跨越浅埋地铁工程为例,分析列车运营时桩板结构、地铁隧道的动力响应特性。研究结论:通过建立桩板结构—地基—地铁模型进行动力仿真分析,研究了单线两节车体加载条件下系统各部位的动力响应特性。结果表明:(1)随列车时速的增加,测点加速度呈线性趋势增加,动应力呈指数趋势增加,动位移呈线性趋势减小;(2)列车激振力引起的动响应通过承载板—托梁—桩基—桩周土体衰减很快,传递至地铁衬砌结构的动响应较小;(3)列车激振力作用下,地铁速度峰值随时速增加近似线性增大,最大值仅为0.96 cm/s,满足规范要求;(4)仿真试验计算值与实车试验测试值总体上较为接近,说明采用三维动力数值仿真试验对桩板结构—地基—地铁振动系统进行动力分析,其计算结果可靠,用以研究桩板结构的动力特性及评判地铁结构在上部铁路激振力下的安全性是可行的。
Research purposes： With the infrastructure construction in China getting better and better gradually, the new - built high - speed railway often has to cross the existing structures. When the subgrade of high - speed railway has to cross the existing subway, the correct evaluation of the impact of the train vibration on the metro and the roadbed structure is important. Taking the pile - slab structure subgrade of the Shanghai - Hangzhou Passenger Dedicated Line crossing shallow subway engineering as an example, this paper studies the dynamic response characteristics of the pile - slab structure and the subway tunnels under the train operation. Research conclusions： The pile - slab structure - foundation - subway numerical model was built to make the dynamic simulation analysis and study the dynamic response characteristics of the system under the condition of loading on two coaches on the single track. The results showed： （ 1 ） With increase of train speed, the acceleration of the measured point increased linearly, the dynamic stress increased exponentially and the dynamic displacement decreased linearly. （2） The dynamic response caused by the excited force decayed quickly through the bearing plate, the joists, the pile foundation and the soil around the pile, so the dynamic response to the subway lining structure was very small. （3） Under the effect of train excited force, the peak value of the subway increased linearly with increase of the train running speed, and the maximum value was about 0.96 cm/s and it satisfied the specification requirement. （4） The three - dimensional dynamic simulation result was very close to the real tested value. So the dynamic numerical model is reliable for making the dynamic analysis of the pile - slab structure - foundation - subway system and is feasible for studying the dynamic characteristics of the pile - slab structure and evaluating the safety of the subway structure under the effect of the excited force of train.
出处
《铁道工程学报》
EI
北大核心
2013年第9期23-29,共7页
Journal of Railway Engineering Society
关键词
沪杭客专
路基
桩板结构
地铁
动力仿真分析
Shanghai - Hangzhou Passenger Dedicated Line
subgrade
pile - slab structure
subway
dynamic simulationanalysis
