摘要
以大西客运专线跨山西太原盆地祁县东观变电站地裂缝带为工程背景,采用Midas/GTS有限元分析软件,建立地裂缝带—路基—天然地基三维动力有限元计算模型,进行高速铁路双线对向和单线行车条件下天然地基路基的垂向动力响应以及双线对向行车条件下不同车速时地裂缝带上下盘天然地基路基垂向动力响应的规律研究。结果表明:地裂缝带对路基动力响应影响显著,且上盘大于下盘;双线对向行车时路基动位移、动加速度和动应力沿路基纵向均呈波形变化且变化较大,而单线行车时变化较平稳,仅在地裂缝带位置处出现错台现象,且双线行车时路基动力响应明显大于单线行车时;双线对向行车时路基动应力在地裂缝带附近出现骤增现象,动应力和动加速度在路基中的影响临界深度分别为35和20 m,动位移沿垂向衰减呈2次函数关系;跨地裂缝带路基动位移和动应力与车速满足1次函数关系,加速度与车速满足2次函数关系。
Taking the Daxi passenger dedicated line crossing the ground fissure zone of the Dongguan substation in Qixian County, Taiyuan Basin of Shanxi Province as the engineering background, Midas/GTS finite element analysis software was used to establish a three-dimensional dynamic finite element calculation model of the ground fissure zone-subgrade-natural foundation. The vertical dynamic response of natural foundation subgrade was studied under the conditions of double-track train operation in opposite directions and single-track train operation. The laws of the vertical dynamic response of natural foundation subgrade on the hanging and foot walls of ground fissure zone under the conditions of double-track train operation in opposite directions at different train speeds were investigated. Results show that the ground fissure zone has a significant impact on the dynamic response of subgrade, and the hanging wall is greater than the footwall. The dynamic displacement,dynamic acceleration and dynamic stress of the subgrade change greatly in waveform along the longitudinal direction of the subgrade under the condition of double-track train operation in opposite directions. However,the change under single track train operation is more stable, and the dislocation only occurs at ground fissure zone, and the dynamic response of the subgrade under double-track train operation is significantly greater than that under single-track train operation. The dynamic stress of the subgrade increases sharply near the ground fissure zone under double-track train operation in opposite directions. The critical effect depths of the dynamic stress and acceleration in the subgrade are 35 m and 20 m respectively, and the dynamic displacement decreases along the vertical direction in a quadratic function relationship. The dynamic displacement and dynamic stress in subgrade crossing ground fissure zone meet the first-order function relationship with the train speed, while the acceleration and train speed meet the quadratic function relationship.
作者
黄强兵
薛力铭
何国辉
王涛
HUANG Qiangbing;XUE Liming;HE Guohui;WANG Tao(Department of Geological Engineering,Chang'an University,Xi'an Shaanxi 710054,China;Key Laboratory of Western China's Mineral Resources and Geological Engineering of Ministry of Education,Chang'an University,Xi'an Shaanxi 710054,China)
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2020年第5期11-19,共9页
China Railway Science
基金
国家自然科学基金资助项目(41772274,41072222)。
关键词
高速铁路
双线路基
地裂缝带
天然地基
列车荷载
动力响应
High-speed railway
Double-track subgrade
Ground fissure zone
Natural foundation
Train load
Dynamic response
