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基于列车—轨道耦合动力学理论,考虑无砟轨道各部件间及无砟轨道与路基间接触状态非线性,建立列车—板式无砟轨道—路基三维非线性有限元耦合动力学模型,进行自重荷载、轨道中长波随机不平顺、轨道短波随机不平顺、路基不均匀沉降荷载、无砟轨道板温度梯度荷载共同作用下,高速铁路CRTS-Ⅰ型板式无砟轨道路基不均匀沉降限值研究。结果表明:无砟轨道板温度梯度荷载对无砟轨道各部件受力均有较明显的影响,因此在进行无砟轨道线路路基不均匀沉降限值研究时有必要同时考虑无砟轨道板温度梯度荷载的影响;路基上CRTS-Ⅰ型板式无砟轨道线路的路基不均匀沉降限值由底座板疲劳破坏控制,路基不均匀沉降幅值达到7mm时无砟轨道底座板的最大拉力达到疲劳破坏限值1.674MPa,因此建议高速铁路CRTS-Ⅰ型板式无砟轨道路基的不均匀沉降限值为7mm/20m。
Based on the theory of train-track coupling dynamics, considering the nonlinear state of contact between ballastless track parts and ballastless track and the roadbed, a three-dimensional nonlinear finite element coupled dynamic model of train-slab ballastless track-subgrade is established, Research on the Undifferentiated Settlement Limit of CRTS-Ⅰ Plate-type Ballastless Track Subgrade under High-speed Railway Under the Combined Action of Straggle-wave Random Irregularity, Straggle Short Stochastic Irregularity, Unbalanced Subgrade Settlement and Temperature Gradient Load of Ballastless Track Plates. The results show that the temperature gradient load of ballastless track slabs affects the stress of each part of ballastless track significantly. Therefore, it is necessary to consider the temperature gradient of ballastless track slab Load; the uneven subgrade settlement of CRTS-Ⅰ slab ballastless track on subgrade is controlled by the fatigue failure of the base plate, and the maximum tensile force of ballastless track base plate reaches the limit of fatigue failure when the subgrade uneven settlement amplitude reaches 7mm The value of 1.674MPa, it is proposed high-speed railway CRTS-Ⅰ plate-type ballastless track subgrade uneven settlement of 7mm / 20m.