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以遂渝线无碴轨道路基为背景,通过室内模型试验研究,分析了在循环加载条件下路基基床的动态力学特性。试验结果表明,动应力响应在基床表层横断面方向上呈“W”形分布,混凝土基础板轨下位置响应最大,中线处和端部响应较小,但随着深度的增加,逐渐变为盆形分布特征;在基床表层范围内,动态响应最为强烈,且随深度的增加,衰减速率较快;加载频率对动应力影响较小,对动位移及加速度影响较大。另外,在遂渝线无碴轨道综合试验段现场实车试验中,分别进行了CRH2型动车组和货物列车不同运行速度下路基基床的动力学响应测试研究,验证并评价了遂渝线无碴轨道路基基床工程适应性。
Based on the ballastless track subgrade of Suining-Chongqing railway line, the dynamic mechanical characteristics of the subgrade under cyclic loading are analyzed by indoor model test. The experimental results show that the dynamic stress response is “W” -shaped in the cross-sectional direction of the bed surface, and the maximum response is found under the concrete foundation slab track. The response at the midline and the end is small, but gradually increases with depth The dynamic response is the most intense in the surface area of bedrock, and the decay rate is faster with the increase of depth. The loading frequency has little effect on dynamic stress and has a great influence on the dynamic displacement and acceleration. In addition, in the real-vehicle test of the comprehensive test section of Suiyu-Ballastless Track, the dynamic response of subgrade bed under different operating speeds of CRH2 type EMUs and freight trains was tested and verified. Adaptability of ballast track subgrade bed engineering.