高速列车与环境耦合作用下双块式无砟轨道结构体系经时综合性能研究

Bi-block ballastless track is one of the most important track stucture, which is widely used in Chinese already built, in construction or to be built high-speed railway. By now, it is superficial in research on the evolution law and mechanism of bi-block ballastless track comprehensive work performance. The criterion and technology are quite incomplete, the scientificity remains to be proven in trials. All of those are just very important matter of science in the process of high-speed railway construction and operation. The program is going to develop the comprehensive superiority of the crossing of railway track, structural engineering and material science. In the course of the program, a model of bi-block ballastless track on subgrade with a scale of 1:1 will be built and the coupling effect of train load and environment will be considered. Many research methods will be used and reflected which include theoretical analysis, numerical simulation, macroscopic test, phenomena observation, microanalysis, model test, field investigation ans so on. finally, the evolution law of bi-block ballastless track comprehensive work performance retaining under coupling effect of high-speed train and environment will be studied, the evolution mechanism of bi-block ballastless track comprehensive work performance retaining will be revealed, the assessment technology of bi-block ballastless track comprehensive work performancce retaining will be constructed, and technical measure to improve bi-block ballastless track comprehensive work performance retaining will be developed. All of the researches are of great importance to establish and perfect the bi-block ballastless track design theory, assessment system and maitaince method with self-owned intellectual property rights.

双块式无砟轨道是我国已建、在建和待建高速铁路中应用最广泛的轨道结构型之一。由于服役时间较短，关于其服役期间经时综合性能演化规律及机理的认识还不够深入，相关的评判标准和技术很不系统，科学性也有待进一步检验，这恰是我国高速铁路建设和运营过程中急需掌握的重大科技问题。本项目拟发挥多学科交叉的综合优势，以轨道结构理论为基础，结合结构工程和材料学理论，以路基上双块式无砟轨道结构体系实尺模型为研究对象，以充分考虑列车荷载与环境耦合作用的实验室模拟为试验手段，应用理论分析与数值仿真，宏观测试、现象观察与微观分析，实尺模型试验与现场调研分析相互映证的研究方法，研究高速列车与环境耦合作用下结构体系经时综合性能演化规律，揭示其演化机理，建立结构体系经时综合性能评定成套技术，研发提升结构体系经时综合性能的技术措施，为建立和完善具有我国自主知识产权的双块式无砟轨道设计理论、评估体系、养护维修方法提供重要技术支撑。

本课题以双块式无砟轨道结构服役期间经时综合性能演化为背景，通过现场取样、现场试验，研究得出了改善道床板与支承层粘结力的支承层表面处理方法；通过双块式无砟轨道结构温度场现场长期连续测试，获得一个完整周期的双块式无砟轨道结构温度场变化规律；开展了双块式无砟轨道结构动力特性足尺模型试验研究，揭示了路基上双块式无砟轨道结构各层受力与振动传递规律及破坏特征；基于太阳辐射及边界表面换热理论，建立温度场分析模型，揭示了不同纬度、线路走向等因素对双块式无砟轨道温度场的影响规律；建立了双块式无砟轨道结构体系精细化数值仿真分析模型，获得了列车、温度荷载作用下双块式无砟轨道结构各层受力分布特征；采用可靠度理论与有限元分析相结合的研究方法，开展了双块式无砟轨道结构体系经时性能评价方法研究；提出了提升双块式无砟轨道结构体系经时综合性能的技术措施；发表论文19篇，获国家专利5项、软件著作权2项，获科技进步奖1项，培养研究生6名（已毕业4名），取得了较好的研究成果。