论文部分内容阅读
采用非线性动力有限元分析,并借助正交试验设计,对列车荷载作用下有砟轨道路基动力响应的影响因素(道床模量、道床阻尼、道床厚度、路基模量、路基阻尼、路基高度、地基模量)进行了敏感性判别分析。结果表明:道床厚度、路基模量和阻尼是路基动力响应的3个最主要影响参数,增加道床厚度、增大路基模量和阻尼是减小路基动力响应的有效手段;增加道床厚度对减小路基动应力最敏感,而增大路基模量最能有效减小路基的动变形和加速度。
Nonlinear dynamic finite element analysis and orthogonal design are used to study the influence factors of dynamic response of ballast track subgrade (such as ballast bed mass, damping of ballast bed, ballast bed thickness, subgrade modulus, subgrade damping, The modulus of foundation) has carried on the sensitivity discrimination analysis. The results show that the thickness of ballast bed, the subgrade modulus and damping are the three most important influence parameters of subgrade dynamic response. Increasing ballast bed thickness, increasing subgrade modulus and damping are effective measures to reduce subgrade dynamic response. Increasing ballast bed thickness decreases The dynamic stress of the subgrade is the most sensitive, and increasing the subgrade modulus can effectively reduce the dynamic deformation and acceleration of the subgrade.