关键词: 凸起地形, 铁路环境振动, 加速度, 振动位移

Abstract: A two-dimensional finite element calculation model of subgrade-hill under the vibration of train is established, and the influence of the width, shape, aspect ratio of hill and soil properties on railway environmental vibration is studied. The result shows that the ground acceleration of railway environmental vibration is reduced, but the horizontal vibration displacement is significantly amplified, and the influence on vertical vibration displacement is not obvious. With the increase of the width and aspect ratio of the hill, the amplification effect of horizontal vibration displacement becomes notable. The larger the aspect ratio is, the more obvious the vertical and horizontal ground accelerations decrease. The influence of semicircular and trapezoidal hill on railway environmental vibration is consistent, but the horizontal acceleration at the top of the triangular hill is locally amplified, and the amplification effect of horizontal vibration displacement is more obvious than that of the trapezoidal and semicircular hills. When the soil is soft, the effect of the hill becomes significant.

Key words: hill, railway environmental vibration, acceleration, vibration displacement