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地震激励下列车-轨道-隧道-土体相互作用系统动力分析

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  • 国家科技期刊平台
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为研究地震激励下列车-轨道-隧道-土体相互作用系统的动力学行为,建立三维列车-轨道-隧道-土体耦合时变动力学模型,以不同强度的地震波和轨道不平顺为系统激励源,通过实际地震动记录进行规格化处理纵向、横向和垂向地震动波,分析不同土质条件、地震强度下列车-轨道-隧道-土体系统动力响应特征.研究结果表明:地震作用可显著增大隧道内列车动力响应,在不同土质条件下,横向轮轨力的波动较无地震激励时显著增大,波动幅度平均增加92.23%,而垂向轮轨力的波动幅度平均增加7.14%,车体垂向、横向加速度分别增大89.50%和25.93%;在不同地震强度下,轮轨横向力与轮轨垂向力在地震强度为0.40g时达到最大,分别为46.760 1 kN与94.8637 kN,相较于地震强度0.35g时分别增大182.68%与5.35%,脱轨系数相较于地震强度0.35g时增幅达到168.28%;地震下土体振动呈放大效应,土体弹性模量较外部激励对放大系数的影响十分显著,其中,放大系数在土体弹性模量最大时为4.080 4;隧道的存在会隔断土体振动传播,隧道顶部土体加速度较隧道底部土体加速度降低约86%.
Dynamic analysis of train-track-tunnel-soil interaction system under seismic excitation
In order to study the dynamic behavior of the train-rail-tunnel-soil interaction system under seismic excitation,a three-dimensional train-rail-tunnel-soil coupled time-varying dynamics model was established,and the dynamic response characteristics of the train-rail-tunnel-soil system under different soil conditions and seismic intensities were analyzed with different intensity seismic waves and track irregularities as the excitation sources of the system,the specification of the longitudinal,lateral and vertical ground vibration waves through the actual ground vibration records.The dynamic response characteristics of the train-track-tunnel system were analyzed under different soil conditions and seismic intensities.The results show that the seismic action can significantly increase the dynamic response of the train in the tunnel,in which the fluctuation of lateral wheel-rail force under different soil conditions increases significantly compared with that in the absence of seismic excitation,and the fluctuation amplitude increases by an average of 92.23%,while the fluctuation amplitude of the vertical wheel-rail force increases by an average of 7.14%,and the car body vertical and lateral acceleration increases by 89.50%and 25.93%,respectively.At different seismic intensities,the wheel-rail lateral force and the wheel-rail vertical force reach the maximum at 0.40g,which are 46.760 1 kN and 94.863 7 kN,respectively,and increase by 182.68%and 5.35%,respectively,compared with 0.35g,and the derailment coefficient increases by 168.28%compared with 0.35g.The vibration of the soil body during the earthquake shows an amplification effect,and the modulus of soil body is higher than the magnification coefficient,which is very large.The effect of external excitation on the amplification coefficient is very significant,in which the amplification coefficient is 4.080 4 at the maximum elastic modulus of the soil.The acceleration of the soil at the top of the tunnel is reduced by about 86%compared with that at the bottom of the tunnel due to the existence of the tunnel which isolates the soil vibration propagation.

train-track-tunnel-soil interactionearthquake effectsdynamic responseamplification factornumerical simulation

徐磊、王炫钧、余志武、李正

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中南大学土木工程学院,湖南长沙,410075

高速铁路建造技术国家工程研究中心,湖南长沙,410075

列车-轨道-隧道-土体相互作用 地震作用 动力响应 放大系数 数值仿真

国家自然科学基金资助项目国家自然科学基金资助项目国家自然科学基金资助项目中国中铁重大专项中国中铁重大专项中国科学青年人才托举工程项目湖南省自然科学基金资助项目湖南省自然科学基金资助项目中国中铁重大课题中南大学创新驱动计划项目

5237846852008404U19342172020-Special-022021-Special-082020-2022QNRC0022021JJ308502022JJ200702021-Major-022023CXQD072

2024

10.11817/j.issn.1672-7207.2024.06.026

中南大学学报(自然科学版)
中南大学

中南大学学报(自然科学版)

CSTPCD北大核心
影响因子：0.938
ISSN：1672-7207
年,卷(期)：2024.55(6)
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