项目名称： 既有线开行大轴重列车路基动力湿化变形机理及适应性研究

项目编号： No.51478279

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 建筑环境与结构工程学科

项目作者： 冯怀平

作者单位： 石家庄铁道大学

项目金额： 80万元

中文摘要： 既有线路开行大轴重列车是铁路发展的一个方向，然而,既有线设计标准低，频繁出现的路基病害不仅增加维护费用也影响行车安全。动应力与水的耦合作用是造成路基病害、恶化的最主要原因，揭示其相互作用机理、评估线路状况的适应性，对确保运营安全有重要意义。本项目采用实时测试动三轴实验中土样水分迁移规律，探索动应力与浸水的耦合作用过程，掌握变形控制参数特征；以非饱和多相介质理论为基础，提出动力-湿化变形模型及计算方法，对揭示轴重增加引起的翻浆冒泥、不均匀沉降等病害的产生规律，为制定合理的病害治理方法有着重要价值；对评价既有线路开行大轴重列车的适应性有重要意义，为我国既有线路重载化和路基强化技术提供理论和技术保障。

中文关键词： 路基工程；重载铁路；动力特性；湿化变形；状态评估

英文摘要： It has become a main trend that running heavy-axle load train in existing line. Subgrade diseases, however, frequently happens, which lead to not only increase of expenses for repair, but also decrease for the running safety. It is the coupling effect of dynamic load and wetting process which is the main reason for the beginning and development of subgrade diseases. As a result, it is very important for safety running to find the reaction mechanism between dynamic load and water seepage in addition to the assessment of existing line. In this project, the water distribution along triaxial sample is measured in time when dynamic triaxial tests is taking. By this way, the coupling process for dynamic load and water is investigated. From tests the main parameters which affect the dynamic wetting process are confirmed. Then, based on the theory of unsaturated theory, a dynamic and wetting coupled model and FEM program will be provided. By this model, the devolvement of diseases, such as mud-pumping, uneven settlement, can be investigated. It is also have benefits for design of repair method, assessment of subgrade and confirming the requirements for embankment. The achievements will offer important theoretical and technical support to run heavy-axle train on existing line.

英文关键词： Subgrade Engineering;Heavy-haul railways;Dynamic characteristics;Wetting deformation;Condition assessment