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遂渝线无砟轨道综合试验段是我国首条成区段铺设的无砟轨道铁路,在综合试验段上试用桩网结构解决土质路基上铺设无砟轨道的技术难题。为考察桩网结构路基在不同列车荷载作用下的响应规律,尤其是对网垫层的动力作用大小,结合工程实践,对无砟轨道桩网结构路基进行现场动车组和货物列车试验测试。结果表明:采用无砟轨道结构可以有效改善列车荷载对路基基床的动力作用,测得的动应力与加速度值均远小于有砟轨道结构测得的值;列车轴重对无砟轨道路基的动应力影响明显,对加速度响应也有一定影响;无论是动车组还是货物列车,其运行速度对路堤部分的动响应影响均有限;动应力与加速度经3 m高的路堤后衰减,对桩网结构路基下部的网垫层已基本无影响。
The comprehensive test section of the Suiyu-Shanghai ballastless track is the first ballastless track railway paved in the section of China. The technical problems of laying ballastless track on soil-based roadbed are tested with the pile-net structure in the comprehensive test section. In order to investigate the response of pile-net structure subgrade under different train loads, especially on the dynamic effect of subsoil, combined with the engineering practice, the on-site EMU and freight train test was carried out on the pile foundation of ballastless track pile structure. The results show that the ballastless track structure can effectively improve the dynamic effect of train load on the subgrade bed, and the measured dynamic stress and acceleration values are far less than those measured by the ballasted track structure. The effect of train axle load on the ballastless track subgrade The dynamic stress has obvious influence on the acceleration response, and also affects the acceleration response to a certain extent. Whether it is the EMU or the freight train, the influence of the running speed on the dynamic response of the embankment part is limited. The dynamic stress and acceleration decay after 3 m high embankment, The subsoil underlay has almost no effect.