加固路基-列车耦合系统地震响应及安全性分析  

Dynamic response and running safety evaluation of a strengthened embankment-train system during earthquake

作　　者：楼云锋[1,2] 时亚州[3] 陈荣[4] 杨勋[1,2] 金先龙[1,2] LOU Yunfeng;SHI Yazhou;CHEN Rong;YANG Xun;JIN Xianlong(School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;State Key Laboratory of Mechanical System and Vibration,Shanghai Jiao Tong University,Shanghai 200240,China;Shanghai Spaceflight Precision Machinery Institute,Shanghai 201600,China;704 Research Institute,China Shipbuilding Industry Corporation,Shanghai 200031,China)

机构地区：[1]上海交通大学机械与动力工程学院,上海200240 [2]上海交通大学,机械系统与振动国家重点试验室,上海200240 [3]上海航天精密机械研究所,上海201600 [4]中国船舶重工集团公司第704研究所,上海200031

出　　处：《振动与冲击》2020年第14期148-155,共8页Journal of Vibration and Shock

基　　金：国家重点研发计划项目课题(2016YFB0201800);国家自然基金项目(51475287,11772192)。

摘　　要：以某计划铺设路基线路为研究对象,考虑黏-弹性人工边界、土壤的非线性、结构间动态接触,建立了列车-路堤-土体耦合系统有限元模型。采用Drucker-Prager材料本构,并进行修正。轮对和钢轨采用双向对称接触方式在轮对与钢轨表面间建立垂向接触对和侧向接触对,轮轨间作用力采用罚函数方法计算。提出了软土地基加固方案,对比分析了地基加固前后,列车-路堤-地基系统的地震响应;讨论了软土路基震后残余变形对列车地震脱轨安全性的影响程度及规律。计算结果表明:地基加固对地震激励下列车-轨道结构动力响应以及列车运行安全性影响显著,加固后脱轨系数、轮重减载率和车体加速度均显著减小。Taking a subgrade line and the running train as research objects, a finite element model of the train-embankment-soil dynamic coupling system was established taking account of the nonlinear material behavior of soil, the viscous-spring artificial boundary, and the dynamic contact between structures. The Drucker-Prager material model was adopted and modified. Making use of the penalty function, the vertical contact interface and the lateral contact interface between the wheel and the rail surface were considered as automatic surface-to-surface contact. The seismic responses of the embankment foundation before and after reinforcement were analyzed. The influence of residual deformation after earthquake on the derailment safety of the running train was discussed. The results show that the dynamic responses of the train and the safety of running train subjected to earthquake are significantly affected by the reinforcement of soft subgrade. After strengthening, the derailment factor, the offload ratio, and the acceleration of the vehicle body are significantly reduced.

关 键 词：列车-路堤-土体耦合系统 软土地基 残余变形 地震响应 列车安全性 

分 类 号：U211.3[交通运输工程—道路与铁道工程]