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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-路基上CRTS-Ⅱ型板式无砟轨道三维非线性有限元耦合动力学模型,在自重荷载、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,对高速铁路CRTS-Ⅱ型板式无砟轨道线路路基不均匀沉降限值进行研究。研究结果表明:无砟轨道板温度梯度荷载对CRTS-Ⅱ型板式无砟轨道各部件受力均有比较明显的影响;在进行CRTS-Ⅱ型板式无砟轨道线路路基不均匀沉降限值研究时,有必要同时考虑轨道板温度梯度荷载的影响;对于路基上CRTS-Ⅱ型板式无砟轨道线路,路基不均匀沉降限值与无砟轨道裂缝间距有很大关系,当裂缝间距为1.3 m时,路基不均匀沉降限值由车体振动加速度控制,其限值为13 mm/20 m(即不均匀沉降波长为20 m,波幅为13 mm);当裂缝间距为2.6 m时,路基不均匀沉降限值由扣件最大拉力控制,其限值为10 mm/20 m。
Based on the theory of train-track coupling dynamics, considering the nonlinear state of the contact between ballastless track parts and ballastless track and the roadbed, a three-dimensional nonlinear finite element coupled dynamic model of CRTS-Ⅱ slab ballastless track on train-subgrade , Under the joint action of self-weight load, random long-wave track irregularity, random short-track irregular wave, subsided subgrade load and temperature gradient load of ballastless track slab, the uneven subgrade of CRTS-Ⅱ slab track of high-speed railway The settlement limit is studied. The results show that the temperature gradient load of ballastless track slabs has obvious influence on the stress of each component of CRTS-Ⅱ slab ballastless track. When studying the non-uniform subgrade settlement of CRTS-Ⅱ slab track, , It is necessary to consider the influence of the temperature gradient load on the track slab at the same time. For the CRTS-Ⅱ slab track on the subgrade, the non-uniform subsidence settlement limit is closely related to the crack spacing of the ballastless track. When the crack spacing is 1.3 m , The uneven subgrade settlement limit is controlled by the vehicle body vibration acceleration with the limit of 13 mm / 20 m (ie, the uneven settlement wavelength is 20 m and the amplitude is 13 mm). When the crack spacing is 2.6 m, the subgrade is uneven The settlement limit is controlled by the maximum pull of the fastener with a limit of 10 mm / 20 m.