土钉支护边坡动力性能参数分析

Parametric analysis for aseismic behavior of soil nailing system

为研究土钉支护参数对土钉支护边坡抗震性能的影响,通过设计并完成振动台模型试验,研究了在不同支护参数(如土钉倾角、土钉长度、土钉间距等)下边坡的动力反应特征。试验结果表明:土钉支护边坡有较好的抗震性能;试验过程中,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,与滑裂面位置并不相同。

In order to investigate the influences of parameters on aseismic behavior of soil nailing system,some shaking table tests are designed and carried out.Dynamic characteristics of the soil nailing system with different parameters（such as nail inclination,nail length,nail space） are studied.It is found that the soil nailing system has good aseismic behavior.The maximum lateral displacement mainly occurs at the abdomen of the slope during the tests,but the displacements at the crest and foot are relatively small.Increasing the soil-nail obliquity will increase the lateral displacement,but increasing the length or reducing the space of soil nail will minish the lateral displacement.The shape of the maximal function belt is polygonal-shape,and the maximum function belt is located in the foreside or middle part of the soil nailing area,which is not the sliding plane appearing under vibration condition.