高速铁路碎石类A、B组填料的动力特性研究

针对碎石类A、B填料填筑的高速铁路路基的长期动变形稳定性问题,以室内短时动三轴试验为依托,依据高速铁路路基的工作条件,建立动三轴试验模型,对碎石类A、B组填料的基床底层和路基本体进行了动模量和阻尼比试验研究,提出了压实度、围压等是动模量和阻尼比最主要影响因素及其相关性;建立了考虑压实度、围压影响的动模量、阻尼比与动剪应变之间的关系模型,证实了动应力-动应变关系可用修正的Hardin-Drnevich模型进行描述,对高速铁路长期动变形稳定性的深入研究具有重要意义。

Dynamic research of subgrade soil of group A,B crushed stone filler in high speed railway

The dynamic triaxial test model was established aiming on the long-term dynamic deformation stability problems of the high speed railway subgrade that made of group A,B crushed stone fillers based on the short-time indoor dynamic triaxial test and the working conditions of the high speed railway subgrade.The dynamic modulus and damping ratio test was conducted for the bed bottom and subgrade body of the group A,B crushed stone fillers.Then,we concluded that the compaction degree,confined pressure are the main influential factors of dynamic modulus and damping ratio.Finally,we established the correlation model of dynamic modulus,damping ratio and dynamic shear strain by considering the influence of compaction degree and the confined pressure.It is confirmed that the dynamic stress-strain relationships can be described using the modified Hardin-Drnevich model.This is of great significance for the indepth study of long-term dynamic deformation stability of high speed railway.