土钉支护抗震性能的振动台试验研究

为研究土钉支护结构体系的抗震性能,设计并完成了土钉支护边坡1:12比尺的振动台试验,研究了土钉支护边坡的动力反应特征和规律。结果表明:土钉支护边坡坡面的最大变形主要发生在边坡坡腹处,坡顶与坡趾的变形相对较小;增大土钉倾角会增大边坡的侧向位移,增加土钉长度以及减小土钉间距则会减小边坡侧向位移;土钉支护最大作用带基本位于土钉支护区的中前部,呈折线形,与计算假设的圆弧形不同,而且该作用带与滑裂面的位置并不相同;边坡土体中部和下部的加速度放大系数较小而且比较接近,边坡上部土体的加速度放大系数则较大。

Study on Aseismic Behavior of Soil Nailing System by Shaking Table Test

In order to investigate the aseismic behavior of soil nailing slope,shaking table tests of 1:12 reduced scale models were designed and carried out.Dynamic characteristics of the soil nailing slope were obtained from the model tests.The maximum lateral displacement mainly occurs at the abdomen of the slope,and the displacements at the crest and foot are relatively small.Increasing nail dip will increase the lateral displacement,while increasing nail length or reducing nail space will minish the lateral displacement. The shape of most functional belt is polygonal-shape instead of hypothetical arc.And the most functional belt is located in the foreside or middle part of the soil nailing area,which is not in accordance with the slide plane appearing in vibration condition.The response accelerations in the middle of the slope and at the bottom are smaller and very close,and are larger at the top part.