台阶型加筋土边坡动力响应

Seismic Responses of Tiered Geosynthetic Reinforced Slope

为了研究台阶型加筋土边坡的动力响应,首先以印度理工学院振动台试验挡墙为原型,验证了有限元数值模拟方法的有效性;然后以一位于我国西南部、抗震设防烈度为7度的边坡工程为背景,利用有限元软件PLAXIS,在坡顶与坡脚相对位置不变的情况下,分析了其动力响应随台阶宽度变化的规律。结果表明,台阶宽度越大,坡面横向位移越小,但过大的台阶宽度对横向位移的减小效果不明显,存在一个最优宽度使最大坡面横向位移取得最小值;随着台阶宽度的增大,填土体积随之上升,下层边坡中筋材最大内力呈放大趋势,其沿高程的分布方式由反"∠"形逐渐过渡到类"3"字形。

In order to study the seismic responses of tiered geosynthetic reinforced slope,the suitability of numerical approach was validated by comparing with the measured results from a test wall in Indian Institute of Technology(IIT).Then,using a tiered reinforced slope located in the southwest China as a reference and the validated numerical simulation method,the seismic responses of tiered reinforced slope with different offset distances were analyzed,while keeping the relative positions of the slope crest and the toe.It is shown that the lateral facing displacements decreased with an increase in the offset distance.However,the effect of overly-large offset distance on the facing displacements is not obvious,and there existed an optimum offset distance.With the increase of offset distance,the volume of backfill soil increased,and the maximum reinforcement load in the lower tier was also higher.The distribution of the maximum reinforcement load along the elevation in the lower tier evolved from an opposite∠-shape to a 3-shape.