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论文采用大型动三轴试验机对花岗岩和石灰岩道碴进行了试验 ,研究了弹性特征与道碴变形随循环加载的关系 ,分析了包括道碴材质、密实度、应力状态及加载次数的影响。试验发现 ,道床弹性是其固有特性 ,主要受其材料特性影响 ,在稳定阶段 ,应力状态影响不大 ,弹性值大小离散性不大 ;花岗岩与石灰岩道碴最大的区别在于前者弹性和累积变形曲线都是稳定和平滑曲线 ,而后者弹性和累积变形曲线波动性比较大 ,反映其抵抗循环荷载的能力比较差 ,粉化、破碎和流动伴随着整个荷载作用过程中 ,从一定意义上揭示了石灰岩道碴对快速和重载的不适应性
In this paper, granite and limestone ballast were tested with a large-scale dynamic triaxial testing machine. The relationship between the elastic characteristics and ballast deformation with cyclic loading was studied. The effects of ballast material, density, stress state and loading times were analyzed. It is found that the elasticity of ballast is its inherent characteristic, which is mainly affected by its material properties. In the stable stage, the influence of stress state is not obvious and the dispersion of elastic value is not large. The biggest difference between granite and limestone ballast lies in the former elastic and cumulative deformation curve Are both stable and smooth curve, while the latter is more volatile and cumulative deformation curve, reflecting its ability to resist cyclic loading is relatively poor, chalking, crushing and flow along with the entire load process, in a certain sense reveals the limestone Ballast is not suitable for fast and heavy loads