Numerical modelling of vibration response in loess hills due to a high-speed train on railway viaduct

IF 0.7 4区 地球科学 Q4 GEOGRAPHY, PHYSICAL
WuJian Yan , Hang Zhang , HaiZhong Zheng , ZhiJian Wu , XinXin Tian
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引用次数: 0

Abstract

In order to accurately analyze vibration characteristics and site effects of loess hills under moving load of a high-speed train, four types of loess hill models under railway viaduct was established by ABAQUS of finite element analysis software by field test. The dynamic response and stability of loess hills under two different vibration sources under high-speed train load were studied by using two-dimensional equivalent linear response time-history analysis, and the influence of the mechanical parameters of loess on the vibration of different types of loess hill was analyzed. Results show that there are obvious differences between peak displacement cloud maps of loess hills under the railway viaduct under gravity and train load action. We analyzed the influence of the change of elastic modulus on vibration propagation of soil of foundation and loess knoll, and found that the change of elastic modulus of soil in different position of foundation has more effect on vibration propagation than that of loess knoll soil. At the same time, the vertical acceleration cloud maps of the four types of loess hills are obviously different.

高架桥上高速列车对黄土丘陵振动响应的数值模拟
为了准确分析高速列车移动荷载作用下黄土丘陵的振动特性和场地效应,通过现场试验,利用有限元分析软件ABAQUS建立了铁路高架桥下黄土丘陵的4类模型。采用二维等效线性响应时程分析方法,研究了高速列车荷载作用下两种不同振动源下黄土丘陵区的动力响应及稳定性,分析了黄土力学参数对不同类型黄土丘陵区振动的影响。结果表明:铁路高架桥下黄土丘陵在重力和列车荷载作用下的峰值位移云图存在明显差异;分析了弹性模量变化对地基土和黄土丘土振动传播的影响,发现地基不同位置土体弹性模量变化对振动传播的影响大于黄土丘土。同时,4种黄土丘陵类型的垂直加速度云图存在明显差异。
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CiteScore
1.40
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