基于模型试验的高铁路基动力累积变形研究  

Study of accumulative deformation of high-speed railways based on physical model testing

作　　者：边学成[1,2] 蒋红光[1,2] 申文明[1,2] 陈云敏[1,2] 

机构地区：[1]浙江大学软弱土与环境土工教育部重点实验室,浙江杭州310058 [2]浙江大学岩土工程研究所,浙江杭州310058

出　　处：《土木工程学报》2011年第6期112-119,共8页China Civil Engineering Journal

基　　金：国家自然科学基金(10702063);国家"十一五"高速铁路支撑计划(2009BAG12A01-B-12-3);浙江省研究生创新科研项目(YK2009007)

摘　　要：高速列车运行中的轮轴往复动荷载引起铁路线下结构产生累积变形,导致轨道平顺性变差,影响列车运行的舒适性和安全性,列车交通荷载引起的路基累积变形是高速铁路线路设计和运营维护中必须考虑的一个重要问题。基于残余应变模型建立了列车轮轴循环动荷载作用下路基填料和下卧层地基土体的累积变形计算方法;通过物理模型试验验证了该模型和计算方法的合理性,并确定了相应的关键参数取值方法,实验结果表明该模型参数具有较好的一致性。最后,通过将计算模型应用到具体的高速铁路线路动力沉降分析中,揭示了路基基床底层和地基累积变形的发展规律,分析了列车轴重和循环次数等主要控制因素的影响作用。High-speed train traffic loading causes accumulative deformation in railway infrastructure and accelerates track irregularity,which will reduce passenger riding comfort and even endanger safe running.Prediction of accumulative deformation in railway infrastructure caused by train traffic loading is essential for high-speed railway design and maintenance.A model for prediction of deformation of roadbed material and subgrade soil under cyclic loading is developed by using residual strain theory.Physical model tests were carried out to calibrate the proposed model and determine the parameters.Calculation results show that the parameters used in the proposed model are fairly consistent under various testing conditions.To illustrate the feasibility of the model,a high-speed railway currently under construction is employed for a case study.The predicted permanent deformation in roadbed and subgrade soil under train loadings is presented,and the parameters influencing railway permanent deformation,such as wheel axle loads and cycle number,are discussed.

关 键 词：循环荷载 路基填料 地基土 累积变形 高速铁路 

分 类 号：TU375.4[建筑科学—结构工程]