重载铁路隧道基底结构长期动力特性试验研究

发布时间：2019-05-16 02:21

【摘要】：针对重载铁路隧道基底结构受列车荷载作用更大的特点,根据付营子隧道现场大型激振试验实现了27 t轴重的重载列车动力加载和长期荷载作用,与远程实测动力数据进行比对验证了试验的客观准确性。讨论了双线重载铁路隧道基底结构在大轴重、高密度的运输环境下由上至下的道床、仰拱填充、仰拱结构和围岩表面的接触压力动力响应和长期变化。研究表明,激振试验能够很好的模拟27 t轴重作用下双线重载铁路隧道基底结构的动力特性,具体表现为各结构表面重载线路轨道下方相应位置的动力响应和长期效应最为明显,且由上至下随竖向深度逐渐减弱。各位置的动压力长期效应受该位置的列车动荷载附加值影响,动力响应越大,长期效应越明显。试验结果可为双线重载铁路隧道基底结构的稳定性评价和设计参数提供理论基础。
[Abstract]:In view of the fact that the basement structure of heavy load railway tunnel is more subjected to train load, the dynamic load and long term load of 27 t axle load are realized according to the large scale excitation test of Fuyingzi tunnel. The objective accuracy of the test is verified by comparing with the remote measured dynamic data. The dynamic response and long-term variation of contact pressure of double-track heavy-duty railway tunnel basement structure from top to bottom under large axial load and high density transportation environment, inverted arch filling, inverted arch structure and surrounding rock surface are discussed. The results show that the excitation test can simulate the dynamic characteristics of the basement structure of the double-track heavy-duty railway tunnel under the action of 27t axial load. The dynamic response and long-term effect of the corresponding position below the track of the heavy load line on the surface of each structure are the most obvious, and gradually weaken with the vertical depth from top to bottom. The long-term effect of dynamic pressure at each position is affected by the added value of train dynamic load at that position. The greater the dynamic response is, the more obvious the long-term effect is. The test results can provide a theoretical basis for the stability evaluation and design parameters of the basement structure of the double-track and heavy-duty railway tunnel.
【作者单位】：西南交通大学土木工程学院;西南交通大学交通隧道工程教育部重点实验室;
【基金】：中国铁路总公司科技研究开发计划课题合同(2014G005-A) 西南交通大学博士研究生创新基金国家自然科学基金面上项目(51578458) 中央高校基本科研业务费专项资金资助项目(2682016CX001)
【分类号】：U239.4;U451

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