Dynamic response analysis of railway embankments under train loads in permafrost regions of the Qinghai-Tibet Plateau
Dynamic response analysis of railway embankments under train loads in permafrost regions of the Qinghai-Tibet Plateau
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青藏高原多年冻土区铁路路基动力响应分析
DOI：
10.1016/j.soildyn.2018.04.047
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发表时间：
2018-09
影响因子：
4
通讯作者：
Wang Lili
中科院分区：
文献类型：
--
作者：
Wu Zhijian;Chen Tuo;Zhao Tao;Wang Lili
利用青藏铁路北路河段多年冻土区碎石路基和平填路基的实时强震观测试验，采集列车通过时的实时加速度数据。利用现场试验数据和动力有限元分析软件(二维、非线性)，分析了列车荷载作用下两种路基的动力传递特性、位移响应以及应力应变关系。通过对比素填路堤的动力响应特性，分析了青藏铁路碎石路堤的动力传递机理。结果表明，振动加速度在碎石层中的传递减弱，提高了路堤的稳定性。碎石路段列车荷载引起的振动沉降量明显减小，最大沉降量仅为0.81 mm，而平填路堤的最大沉降量可达1.87 mm。因此，碎石层改变了路堤内部的应力应变状态，增大了路堤的最大主应力，减小了最大剪应变的幅度和范围。
Using real-time strong-motion observation tests of a crushed-rock embankment and a plain-fill embankment in a permafrost region of the Beiluhe River section along Qinghai-Tibet Railway (QTR), we collected the real-time acceleration data when trains were passing. We used field test data and dynamic finite element analysis software (two-dimensional, nonlinear) to analyze the characteristics of dynamic transmission, displacement response, and the stress-strain relationship of both types of embankments bearing the load of a train. By comparing the dynamic response characteristics of the plain-fill embankment, we analyzed the dynamic transmission mechanism of the crushed-rock embankment of QTR. The results showed that vibration acceleration transmission was decreased through the crushed-rock layer, which could improve the stability of the embankment. Also, the vibration settlement caused by train loading was decreased obviously in the crushed-rock layer, in which the maximum settlement displacement was only 0.81 mm, while that of the plain-fill embankment reached 1.87 mm. Thus, the crushed-rock layer changed the state of stress-strain within the embankment, which helped increase the maximum principal stress of the embankment and decrease the amplitude and range of the maximum shear strain.
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影响因子：
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作者：
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DOI：
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