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详细地掌握高速铁路路基的动态特性与累积变形特性是对其进行合理设计的基础。结合达成线的建设,修建了路基试验段,埋设测试元件,使用新型的ZSS50循环加载设备,对试验段路基进行了现场循环加载试验研究,模拟了不同轴重列车的动力作用,分析了路基的动态特性及沉降规律。测试结果表明:路基的动态指标及工后沉降均满足设计要求,列车轴重对路基的动态特性影响显著;路基面动态响应沿横向的分布是不均匀的,轨下位置最大,轨枕端部位置次之,线路中线处最小,总体上呈马鞍形分布;动态响应随路基深度的增加而逐渐减小,在基床表层范围内衰减较快;ZSS50循环加载设备可准确模拟不同轴重、不同时速列车对线路的动力作用,且操作简单、坚固耐用,是研究铁路轨道及路基动态特性的理想设备。
To master the dynamic characteristics and cumulative deformation characteristics of high speed railway subgrade in detail is the basis of its rational design. Combined with the construction of Dacheng Line, the subgrade test section was built, the test components were buried, and the new ZSS50 cycle loading equipment was used to carry out the on-site cyclic loading test research on the subgrade in the test section. The dynamic effects of the train with different axle loads were simulated. Dynamic characteristics and settlement law. The test results show that the dynamic indexes of subgrade and post-construction settlement all meet the design requirements. The axle load of train has a significant influence on the dynamic characteristics of subgrade. The distribution of dynamic response of subgrade is not uniform along the horizontal direction, The second one is that the midline of the line is the smallest and saddle-shaped in the whole. The dynamic response decreases with the increase of the subgrade depth and decays rapidly in the surface of the bed. The ZSS50 cycle loading device can accurately simulate the different shaft weights and different Speed train on the line of the dynamic role, and the simple operation, durable, is to study the dynamic characteristics of the railway track and subgrade ideal equipment.