地震列车荷载耦合作用下桩网复合路基动力响应
邓友生1,2张克钦1李辉3李文杰1肇慧玲1马二立1
Dynamic Response of Pile-Net Composite Subgrade under Coupled Seismic-Train Load Effect
DENG Yousheng1,2ZHANG Keqin1LI Hui3LI Wenjie1ZHAO Huiling1MA Erli1
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作者信息:1.西安科技大学桩承结构研究中心， 710054， 西安
2.西安交通工程学院轨道交通工程安全与智能控制重点实验室， 710030， 西安
3.青海大学土木水利学院， 810016， 西宁
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Affiliation:1.Pile-Supported Structures Research & Test Center, Xi’ an University of Science and Technology, 710054, Xi’ an, China
2.Key Laboratory of Rail Traffic Engineering Safety ＆ Intelligent Control, Xi’an Traffic Engineering Institute, 710030, Xi’an, China
3.School of Civil Engineering and Water Resource, Qinghai University, 810016, Xining, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2025.05.023
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中图分类号/CLCN:U213.244
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栏目/Col:土建工程
摘要:
［目的］随着高速铁路的快速发展，列车行驶过程中遇到地震的可能性大幅提高，因此有必要研究不同列车运行速度与峰值加速度下的桩网复合路基动力响应问题。［方法］以京沪高速铁路上铺设的CRTSⅡ型板式无砟轨道为例，基于有限元软件建立三维轨道-桩网复合路基模型，通过子程序施加列车移动荷载与地震波，分析其轨道振动、动应力传递、桩体受力及行车安全性。［结果及结论］当列车运行速度较高时，列车与地震的共振效应明显，峰值加速度对于轨道的竖向振动影响较小。地基的动应力幅值主要由地震作用控制，地基表面的动土应力会出现突变增大的情况。随着水平距离的增加，桩土动应力比呈先增大后减小的变化趋势，土工格栅的拉应力逐渐增加，并在到达土工格栅边缘时变为负值。桩体轴力与弯矩幅值随着峰值加速度与列车运行速度的增加而增加，越靠近土工格栅边缘的桩体受列车运行速度的影响越小。列车在行驶中的脱轨系数受地震峰值加速度的影响较小，但受列车运行速度的影响较大，在地震中可通过降低列车运行速度来提升行车安全性。
Abstracts:
［Objective］With the rapid development of high-speed railways, the possibility of encountering earthquakes during train operation has significantly increased. Therefore, it is necessary to study the dynamic response of pile-net composite subgrades at different train running speeds and peak accelerations.［Method］Taking the CRTS Ⅱ plate-type ballastless track laid on the Beijing-Shanghai High Speed Railway as an example, a three-dimensional track-pile-net composite subgrade model is established using finite element software. Track vibration, dynamic stress transfer, pile forces, and driving safety are analyzed by applying train moving loads and seismic waves with subroutines.［Result & Conclusion］When the train runs at a higher speed, the resonance effect between the train and seismic is obvious, and the peak acceleration shows less effect on vertical track vibrations. The dynamic stress amplitude of foundation is dominated by seismic action, and the dynamic soil stress on the foundation surface shows a sudden increase. With the increase of horizontal distance, the pile-soil dynamic stress ratio exhibits a trend of first increasing and then decreasing, and the geogrid tensile stress gradually increases and turns negative when reaching the geogrid edge. The axial force and the bending moment amplitude of the pile body increase with the uplift of peak accelerations and train speeds. The closer the pile body is to the geogrid edge, the less it is affected by train operation speed. The train derailment coefficient in operation is less affected by the seismic peak acceleration, but is more affected by train operation speed. In case of earthquake, the operation safety can be enhanced by reducing train operation speed.
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