岩溶段连拱隧道列车振动响应及地基累积变形

发布时间：2018-04-15 02:22

本文选题：连拱隧道 + 列车振动　；参考：《中南大学学报(自然科学版)》2014年03期

【摘要】：采用动力有限差分数值计算方法,针对列车荷载作用下,宜万铁路白云山隧道穿越大型溶腔段连拱隧道结构动力响应问题进行计算分析,并进一步基于Dingqing Li塑性应变模型,探讨列车长期反复荷载作用下岩溶地基的累积沉降变形计算方法。研究结果表明:穿越大型溶腔的白云山隧道连拱结构段,各典型位置受列车荷载振动影响不明显,最大拉压应力峰值和位移变形均小于结构材料的设计值和正常使用允许值;隧底岩溶地基在列车长期荷载反复作用100 a后,累积塑性变形小于20 mm,能够满足列车高速运行对线路平顺性的要求,不会对列车长期运营造成破坏性影响。
[Abstract]:Dynamic finite difference numerical method is used to analyze the dynamic response of Baiyunshan tunnel under train load, which is based on Dingqing Li plastic strain model.This paper discusses the method of calculating the cumulative settlement and deformation of karst foundation under the action of train long term repeated load.The results show that the typical position of Baiyunshan tunnel is not affected obviously by train load vibration, and the maximum tensile and compressive stress and displacement are smaller than the design value of structural material and the allowable value of normal use.The accumulated plastic deformation is less than 20 mm after the repeated action of long term load on the tunnel bottom karst foundation for 100 years, which can meet the requirements of the high speed running of the train on the ride comfort of the railway line, and will not have a destructive effect on the long term operation of the train.
【作者单位】：中南大学土木工程学院;高速铁路建造技术国家工程实验室;铁道第三勘察设计院集团有限公司;
【基金】：国家重点基础研究发展计划(“973”计划)项目(2011CB013802) 国家自然科学基金高铁联合基金重点资助项目(U1134208) 国家自然科学基金资助项目(50808176,51108461,53008310) 湖南省高校创新平台开发基金资助项目(10K075) 中国建筑第五工程局有限公司项目(2011)
【分类号】：U451.3

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