项目名称： 化学-力学耦合作用下无砟轨道中水泥基部件钙溶蚀动力学及影响规律研究

项目编号： No.51478476

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： 邓德华

作者单位： 中南大学

项目金额： 80万元

中文摘要： 在我国高速铁路运营中，因雨水的化学和高速列车动载的耦合作用无砟轨道中的轨道板、充填层、底座和道床板等水泥基部件间结合面处出现较普遍的钙溶蚀现象，它严重影响轨道结构的平顺性、耐久性和列车运行的舒适性和安全性。虽然水泥基材料的钙溶蚀问题已有大量研究成果，但化学-力学耦合作用下钙溶蚀动力学及影响规律的研究报道少见。本项目拟根据无砟轨道结构和服役环境特点，采用雨水-动载耦合作用模拟试验和硝酸铵溶液-动载耦合作用加速模拟试验等，研究蒸养混凝土、现浇混凝土和水泥乳化沥青砂浆等三种水泥基材料的钙溶蚀动力学，建立动力学方程；采用现代分析手段和测试方法，分析钙溶蚀对水泥基材料的组成、微结构和静、动态力学行为的影响规律；运用相关理论知识，构建静、动态力学性能衰变模型。在此基础上，研究组合试件中不同材料结合面上钙溶蚀及其对试件几何尺寸的影响规律，为既有无砟轨道的维护和新建无砟轨道的技术改进提供理论依据。

中文关键词： 水泥基材料；钙溶蚀；化学-力学耦合作用；无砟轨道；高速铁路

英文摘要： During the service of high-speed railway, due to the coupled chemo-mechanical action resulting from rain and the dynamic load of high train, calcium leaching of the cement-based components in ballastless tracks is widely appeared. Thus, the smooth-going and durability of ballastless tracks as well as the ride comfort and operation safety of high train are considerably affected by the accumulation of damage resulting from the coupled chemo- mechanical deterioration. However, researches on the deterioration of cement-based materials due to coupled chemo-mechanical action of both the chemical attack of rain and the dynamic load are seldom reported. For that reason, in this proposal, according to the service and load conditions of different types of ballastless track structures, laboratory simulation tests of the coupled rain-dynamic load or the coupled ammonium nitrate-dynamic load are used to investigate the dynamics of calcium leaching of three cement-based materials such as steam cured concrete, plain concrete and cement-asphalt mortar. Through analyzing the characteristics of the microstructures, phases as well as mechanical properties of the leached specimens, the coupled chemo-mechanic deterioration models of three cement-based materials are studied. Based on above researches, the behavior of the two-unit specimens suffering from coupled chemo-mechanical action is analyzed.

英文关键词： cement-based materials;calcium leaching;coupled chemo-mechanical deteriaotion;ballastless track;high-speed railway