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目的:对于高速铁路,老化和雨水冲刷浸泡将导致无砟轨道水泥沥青砂浆(CA砂浆)软化现象。CA砂浆的软化严重影响轨道动力特性,甚至危害高速列车行车安全。通过仿真计算,系统地调查CA砂浆软化对高速列车行车安全以及轨道动力特性的影响。创新点:系统地对比CA砂浆软化对车辆-轨道动力学特性和轨道层间破坏的影响,为工程实际提供参考。方法:1.通过建立三维车辆-轨道耦合动力学模型以及CA砂浆软化模型,分析CA砂浆软化对行车安全以及轨道动力特性的影响(图2);2.通过轨道-路基非线性有限差分耦合模型,分析CA砂浆软化对轨道层间破坏的影响(图3)。结论:通过车辆运行安全性分析、轨道位移限值分析以及轨道层间失效分析,得出以下结论:1.CA砂浆软化系数达到10~100时,轨道层间剪切失效开始快速发展;2.CA砂浆软化系数不能超过1000,当CA砂浆软化系数超过该值时,高速列车将面临脱轨危险。
Purpose: For high-speed railway, aging and rainwater scouring will lead to softening of ballastless asphalt cement mortar (CA mortar). CA mortar softening seriously affect orbit dynamic characteristics, and even endanger the safety of high-speed train driving. Through the simulation calculation, the effect of CA mortar softening on driving safety and orbit dynamic characteristics of high-speed trains is systematically investigated. Innovative point: systematically contrast the impact of CA mortar softening on vehicle-orbit dynamics and track damage, providing a reference for engineering practice. Through the establishment of three-dimensional vehicle-track coupling dynamics model and CA mortar softening model, the effect of CA mortar softening on driving safety and orbit dynamic characteristics is analyzed (Fig. 2) .2. By using the nonlinear finite difference coupling model , Analysis of the impact of CA mortar softening of track damage between layers (Figure 3). CONCLUSIONS: Through the analysis of vehicle running safety, the limit of orbit displacement and the failure analysis of orbit layers, the following conclusions are drawn: 1. When the softening coefficient of mortar reaches 10 to 100, the failure of interlaminar shear splitting begins to develop rapidly; CA mortar softening coefficient can not exceed 1000, when the CA mortar softening coefficient exceeds this value, high-speed train will face derailment danger.