现代有轨电车路基动力响应机理与设计理论研究

As a green transportation mode of sustainable development, modern tram has a broad development prospect in China. However, because the research on the dynamic response of modern tram subgrade under dynamic load has still been in initial stage, there is not a complete set of design theory to guide the engineering practice in China, which could easily result in an irrational design. Therefore, this program performs a research on dynamic response mechanism and design theory of modern tram subgrade. First, the response characteristics of the foundation soil with different depths under modern tram moving load are obtained by conducting a field test. Then, a series of dynamic triaxial tests and hollow cylinder tests are conducted to reveal the effects of modern tram load on the dynamic pore pressure, and rebound and permanent deformation of subgrade. After that, large dynamic triaxial tests and numerical analysis are performed to investigate the dynamic characteristics of subgrade with shallow reinforcement techniques as well as its effect on the permanent deformation of subgrade. Based on the above research, theoretical analysis is conducted to establish design theory and calculations of modern tram subgrade considering the combined action of pavement structure and subgrade. The research is significantly meaningful in both academic and practical phases to reveal the dynamic response mechanism of modern tram subgrade, and to develop the design theory and calculations of modern tram in China.

现代有轨电车是一种可持续发展的绿色交通方式，在我国有着广阔的发展前景。但是由于目前对现代有轨电车动载下路基的动力响应机理研究尚处起步阶段，我国还没有一套完整的设计理论来指导工程实践，容易造成设计的不尽合理。本课题开展现代有轨电车路基动力响应机理与设计理论研究。首先，通过现场试验获得现代有轨电车循环荷载下不同深度地基土对振动荷载的响应特征；其次，通过循环三轴试验和空心圆柱试验揭示现代有轨电车移动荷载对地基土动孔压、回弹变形和永久变形的影响；而后，采用大型循环三轴试验和数值分析研究浅层软基处理形成的加固区的动力特性，分析浅层加固技术对路基长期变形特性的影响；基于以上研究成果，通过理论分析建立基于路面结构与路基共同作用的现代有轨电车路基设计理论和计算方法。研究成果对于揭示现代有轨电车路基动力响应机理，发展我国现代有轨电车设计理论和计算方法具有重要的理论和实际意义。

现代有轨电车是一种可持续发展的绿色交通方式，可以缓解城市交通问题和大气污染问题。同时，考虑经济的因素，在二三线城市或一线城市的郊区地带发展现代有轨电车公共交通系统，可以形成多层次的功能分工合理、互补、衔接良好的一体化城市绿色公共交通系统。.目前对现代有轨电车动载下路基的动力响应机理研究尚处起步阶段，我国还没有一套完整的设计理论来指导工程实践，容易造成设计的不尽合理。本课题开展现代有轨电车路基动力响应机理与设计理论研究。首先，通过现场试验获得现代有轨电车循环荷载下不同深度地基土对振动荷载的响应特征；其次，通过循环三轴试验揭示现代有轨电车移动荷载对地基土动孔压、回弹变形和永久变形的影响；而后，采用大型循环三轴试验和数值分析研究浅层软基处理形成的加固区的动力特性，分析浅层加固技术对路基长期变形特性的影响；基于以上研究成果，通过理论分析建立基于路面结构与路基共同作用的现代有轨电车路基设计理论和计算方法。研究成果对于揭示现代有轨电车路基动力响应机理，发展我国现代有轨电车设计理论和计算方法具有重要的理论和实际意义。