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结合合肥—南京客货共线铁路试验段进行路基原位动载试验,通过模拟测试路基在相同机车轴重不同通过车速情况下的弹性变形及振动加速度,对路基在不同行车速度条件下的动力响应作以研究。通过对循环荷载下沿线路横向不同距离路基弹性变形、加速度以及轨下不同深度动应力测试,获得路基弹性变形、加速度以及动应力衰减规律。研究表明,现有规范对弹性变形的建议值不尽合理,提出时速200 km及以上客运专线铁路弹性变形合理建议值,为新建铁路客运专线设计及规范提供依据。
Combined with the experimental section of Hefei-Nanjing passenger-freight railway, the subgrade dynamic test was carried out. Through the simulation test, the dynamic deformation of subgrade at different driving speeds under the same locomotive axle load was analyzed by elastic deformation and vibration acceleration. Respond to study. The law of elastic deformation, acceleration and dynamic stress attenuation of subgrade are obtained by testing the dynamic deformation of the subgrade at different distances along the horizontal direction under cyclic loading and the dynamic stress at different depths under the track. The research shows that the proposed values of elastic deformation are not reasonable, and the reasonable recommended value of elastic deformation for passenger dedicated railway line with a speed of 200 km / h is proposed to provide the basis for the design and specification of new passenger dedicated railway line.