Large-scale dynamic triaxial tests under train-induced repeated load were conducted to study the variation of resilient modulus of the coarse-grained soil under different moisture contents, dynamic stress amplitudes, number of loading cycles and confining pressures. The results show that the state of specimens under the dynamic load can be divided into three categories: stable, critical and failure in accordance with the development trends of the accumulated plastic strain. For the saturated stable specimen, the resilient modulus tends to be stable at about 1000 cycles, while for the unsaturated stable specimen, the resilient modulus shows an increase trend with the increasing number of loading cycles. Resilient modulus increases with the increase of dynamic stress amplitude and confining pressure, but decreases with the increase of moisture content. The larger the amplitude of confining pressure and dynamic stress is, the more the resilient modulus decreases with the increase of moisture content.

开展了列车反复荷载下大尺度动三轴试验，研究了不同含水率、动应力幅、荷载循环次数和围压下粗粒土回弹模量的变化规律。结果表明,试件在动载荷作用下的状态按照累积塑性应变的发展趋势可分为稳定、临界和失效三类。对于饱和稳定试件，弹性模量在1000次左右趋于稳定，而对于不饱和稳定试件，随着加载次数的增加，弹性模量呈增加趋势。弹性模量随着动应力幅值和围压的增加而增加，但随着含水量的增加而降低。围压和动应力的幅值越大，回弹模量随着含水量的增加而降低的越多。