【摘要】 采用线弹塑性砂岩路堑边坡模型和有限元分析方法对碎石土砂岩路堑边坡以及顺层砂岩路堑边坡进行时程分析,通过研究水平和竖直方向峰值加速度放大系数与路堑边坡坡面相对高程之间的关系,得出水平方向峰值加速度放大系数随着相对高程的增加而不断增加,竖直方向峰值加速度放大系数随着相对高程的增加而不断减小或者先减小后增加的结论。同时也发现峰值加速度放大系数的变化速率不仅与路堑边坡岩层交界面有关,还与其力学属性有关;在岩层交界面附近水平方向和竖直方向峰值加速度的放大效应明显;砂岩路堑边坡在新鲜岩层表现出较小的放大效应,而在风化程度越高的岩层,其放大效应越大。更多还原

【Abstract】 The paper adapts linear elastic-plastic sandstone cutting slope model and the finite element analysis method for the gravel and bedding sandstone cutting slope. By the analysis of the relationship between magnification coefficient of horizontal and vertical peak ground acceleration( PGA) and relative height of slope surface,the horizontal PGA amplification coefficient increases with the increase of the relative height,while the vertical PGA amplification coefficient decreases or decreases first then increases with that. Meanwhile,the change rate of PGA amplification coefficient is not only related with rock interface but also mechanical properties; the horizontal and vertical PGA amplification effect is obvious at rock interface; the fresh sandstone shows smaller amplification effect,and the weathering degree of strata is higher,amplification effect is more obvious.更多还原