特种荷载作用下高速铁路路基本体参数敏感性研究  

Study on the Sensitivity of Basic Body Parameters of High-Speed Railway Subgrade Under Special Load

作　　者：王新泽[1] WANG Xinze(China Railway 18^(th)Bureau Group No.2 Engineering Co.Ltd.,Tangshan Hebei 063000,China)

机构地区：[1]中铁十八局集团第二工程有限公司,河北唐山063000

出　　处：《铁道建筑技术》2023年第2期77-82,共6页Railway Construction Technology

基　　金：天津市科技计划项目(20YDTPJC00660)。

摘　　要：为研究高速铁路路基本体参数对特种荷载的敏感性,建立有限元模型并设计正交试验进行参数敏感性分析。参考汉巴南客专CRTSⅢ型板式无砟轨道-路基结构,结合瞬态动力学理论与人工边界方法,进行参数化有限元建模;设计正交试验,改变路基本体材料参数得到相应动力响应;利用极差分析和方差分析两种方式研究路基本体力学参数对特种荷载的敏感性。结果表明:路基本体弹性模量E对各项动力响应的敏感性最大且远大于其他参数,适当采取压实措施增大路基本体弹性模量对高速铁路路基承受特种荷载有显著防护效果,但结合振动加速度a计算结果,E值应该控制在150 MPa左右最为合适;路基本体填料塑性参数c、φ对特种荷载作用下高铁路基动力响应影响作用较小,即机动站坪设计对岩土填料种类并无特殊要求。To study the sensitivity of basic body parameters of a high-speed railway subgrade to special loads, a finite element model was established and orthogonal tests were designed to analyze the sensitivity of parameters. Firstly, referring to the CRTSⅢ slab ballastless track-subgrade structure of Hanzhong-Bazhong-Nanchong Passenger Dedicated Line, the parametric finite element modeling was carried out in combination with the transient dynamics theory and the artificial boundary method;secondly, the orthogonal test was designed to change the material parameters of the subgrade body to obtain the corresponding dynamic response. Finally, the sensitivity of the basic physical parameters of the subgrade to special loads was analyzed by range analysis and variance analysis. The research shows that the elastic modulus E of the subgrade body is the most sensitive to various dynamic responses and is much greater than other parameters. Properly taking compaction measures to increase the elastic modulus of the subgrade body has a significant protective effect on the subgrade of high-speed railway bearing special loads, but combined with the calculation results of vibration acceleration a, the value of E should be controlled at about 150 MPa;the plasticity parameters c and φ of subgrade body filler have little effect on the dynamic response of high-speed railway subgrade under special loads, that is, the design of mobile station has no special requirements on the types of geotechnical fillers.

关 键 词：铁路路基 参数敏感性 数值计算 无砟轨道-路基耦合系统 正交试验 粘弹性人工边界 

分 类 号：U238[交通运输工程—道路与铁道工程] U213.1