列车振动荷载作用下原状黄土动力特性试验

在动三轴试验的基础上，对列车振动荷载作用下原状黄土的动力特性进行研究。试验结果表明:原状黄土在一定的动应力作用下，应变随着振次的增大而增大，随固结应力的增大而减小。应变与动应力在一定条件下近似为双曲线模型。当动应力比较小时，应变与动应力呈近似的直线关系，但随着动应力增大超过了某一临界值时，原状黄土所产生的应变急剧增加，且增加速率随着振动次数的增加而增加。在一定的振动次数下，土样的应变随振动频率的增大而减小，且频率越小的土样越先出现转折点。原状黄土在固结应力比K_c为1时，动弹性模量随着动应变的增加而减小，且逐渐趋于稳定。动阻尼比随应变增大没有明显的增大趋势，分布比较离散，但其值均在0.10～0.30的范围以内变化。 

Experimental study on dynamic properties of intact loess under train vibrating load

Based on a lot of dynamic triaxial tests,some dynamic characteristics on intact loess under the train vi-bration load are studies.The test results showed that when the intact loess was under certain dynamic stress,strain increased with the increase of the number of vibration,and decreased with the decrease of consolidation stress.The relation between stress and strain can be fitted with hyperbolic model under certain conditions.When dynamic stress was smaller,strain could be fitted linearly with dynamic str...