| 动荷载作用下高温冻土路基动力响应的模拟试验研究 |
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| 引用本文： | 常利武,徐艳杰,乐金朝.动荷载作用下高温冻土路基动力响应的模拟试验研究[J].铁道学报,2011(11):80-84. |
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| 作者姓名： | 常利武 徐艳杰 乐金朝 |
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| 作者单位： | 郑州大学水利与环境学院;中原工学院建筑工程学院;华北水利水电学院资源与环境学院; |
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| 摘 要： | 高温冻土地区铁路路基,由于列车动荷载对土体产生扰动而影响其稳定性。通过分析影响冻土路基应力、变形及温度场等主要因素,建立冻土路基模拟试验装置;在路基内部及周围地表布设压力和变形传感器,并用自行设计列车动荷载加载装置对路基施加模拟荷载,进行冻土路基动力响应模拟试验。试验获得不同动荷载频率作用下路基周围地表变形以及内部土压力的变化规律。试验结果表明:动荷载频率对地表竖向位移及路基土压力的影响均存在一个临界值,采用适当的列车行驶速度可减小对冻土路基的挠动;路基内部温度场监测结果表明,动荷载可引起土体局部温升,建议采用积极的防护措施以保护路基的冻结状态。研究成果可为维护青藏铁路路基稳定提供参考。
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| 关 键 词： | 冻土路基 响应 模拟试验 动荷载 青藏铁路 |
Simulation Experiment of Dynamic Responses of High Temperature Frozen Subgrade to Dynamic Loading |
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| CHANG Li-wu, XU Yan-jie YUE Jin-chao.Simulation Experiment of Dynamic Responses of High Temperature Frozen Subgrade to Dynamic Loading[J].Journal of the China railway Society,2011(11):80-84. |
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| Authors: | CHANG Li-wu XU Yan-jie YUE Jin-chao |
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| Affiliation: | CHANG Li-wu1,2 XU Yan-jie3 YUE Jin-chao1(1.School of Water Conservancy and Environment,Zhengzhou University,Zhengzhou 450001,China,2.School of Civil Engineering and Architecture,Zhongyuan University of Technology,Zhengzhou 450007,3.School of Resources and Environment,North China Institute of Water Conservancy and Hydroelectric Power,Zhengzhou 450011,China) |
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| Abstract: | Dynamic loads of the train disturb the stability of the soil body of the railway subgrade in high-temperature permafrost regions.The test set for simulation of the frozen-soil subgrade was designed by analysis of the main influencing factors such as the inner soil pressures,displacements and temperature field of the subgrade.Using the self-made experimental loading device to apply dynamic loads onto the subgrade and placing pressure and deformation sensors inside the subgrade and on the surface of the surro... |
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| Keywords: | frozen subgrade response simulated experiment dynamic loads the Qinghai-Tibet Railway |
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