高速铁路路基长期动力稳定性评价方法研究

项目名称： 高速铁路路基长期动力稳定性评价方法研究

项目编号： No.51278499

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 建筑科学

项目作者： 杨果林

作者单位： 中南大学

项目金额： 80万元

中文摘要： 目前我国铁路路基长期动力稳定性评价采用临界动应力法，然而高速铁路路基长期动力稳定不仅是强度问题，而且是变形控制问题，现行评价方法已不能满足高速铁路发展需求。结合拟建的云桂高速铁路膨胀土、红粘土路基工程实体，进行动三轴、疲劳动三轴、共（自）振柱及跨孔波速法试验，获得两类路基的动剪应变、动强度、动剪模量和阻尼比等动力评价参数；通过现场激振试验，获得两类路基的动应力、振动速度、加速度等沿基床不同位置的变化规律。根据试验结果,在临界动应力法的基础上，引进国外的动剪应变法和有效振速法，并对这三种评价方法进行改进和完善，形成新的三种评价方法；运用三种新的评价方法对云桂高速铁路两类路基进行长期动力稳定性评价，提出合理的基床换填厚度，地基处治和加固深度,供实际工程采用。对三种新的评价方法进行通用性研究，通过相关部分评审后，将其纳入到《高速铁路路基设计规范》中。

中文关键词： 高速铁路；路基工程；长期动力稳定性；评价方法；

英文摘要： Currently, the long-term dynamic stability evaluation of railway subgrade bed is based on critical dynamic stress in China. However, the long-term dynamic stability of high-speed railway subgrade bed is not only decided by the strength but also the deformation. The critical dynamic stress can not meet the development of highspeed railway. Rely on two types of subgrade bed which are constructed on swelling soil and red clay foundtion along the YunGui highspeed railway. Obtained the dynamic evaluating parameters such as shear strain, dynamic strength, dynamic shear modulus and damping of the two types of soil by the dynamic triaxial test, Fatigue dynamic triaxial test, Resonant(Vibration) column test and in-situ cross-hole wave velocity method experiment, the changing regularity of dynamic stress, vibration velocity, acceleration along the different locations of the subgrade bed through in-situ vibration test. Combined with the experiments results, we try to introduce two new types of dynamic stability evaluation methods of the railway subgrade bed beyond the dynamic stress method, the dynamic shear strain method and dynamic effective velocity method, and improve the limitation of these three evaluation methods. To evaluate the dynamic stability of the cutting bed of Yun-Gui high-speed railway by the three improve

英文关键词： high-speed railway；subgrade engineering；long-term dynamic stability；evaluation methods；