边坡筋锚三维网柔性防护结构的稳定性分析

Stability analysis of flexible protection structure for slope reinforced anchor 3D-geomat

针对降雨时边坡筋锚三维网柔性防护结构可能沿坡面滑动失稳的问题,基于极限平衡理论,考虑雨水击溅和坡面水流冲刷作用,建立了降雨条件下边坡筋锚三维网柔性防护结构的稳定性分析模型,并进行了实例分析,探讨了边坡倾角、降雨强度、防护结构层厚度、锚钉间距、锚钉锚固长度对防护结构稳定性的影响。结果表明:与无降雨相比,降雨条件下边坡筋锚三维网柔性防护结构受到的下滑力增大,抗滑力减小,防护结构的稳定性明显降低;在相同的防护结构设计参数下,防护结构的稳定性随边坡倾角增加而减小,当坡面形成径流后,降雨强度对防护结构稳定性的影响比较小;在相同的边坡条件下,防护结构的稳定性系数随锚钉间距、结构层厚度的增大而减小,随锚钉锚固长度的增加而增大;锚钉间距和锚固长度对防护结构稳定性的影响最显著,锚钉间距可通过建立的模型合理确定,锚固长度不宜小于0.5 m。

Aiming at the problem of sliding instability along slope surface during rainfall for 3D mesh flexible protection structure with reinforcement and anchorage,a stability analysis model of slope protection structure under rainfall condition was established based on limit equilibrium theory,considering the splash of rainwater and the scouring effect of flow on the slope surface.Case study was performed and the effects of slope inclination,rainfall intensity,protective layer thickness,distance between anchors and anchorage length on the stability were discussed.The results show that under rainfall conditions,the sliding force of the slope protective structure increases,the anti-sliding force decreases,and the stability of the protective structure decreases obviously.Under the same design parameters for the protective structure,the stability of protective structure decreases with the increase of slope inclination.When runoff forms on the slope surface,the influence of rainfall intensity is relatively small.Under the same slope condition,the stability coefficient of the protective structure decreases with the increase of the distance between anchors and the thickness of the structural layer,and increases with the increase of anchorage length.The distance between anchors and anchorage length have the most significant influence on the stability of protective structure.The distance between anchors should be reasonably determined by the stability analysis model proposed in this paper,and the anchorage length should not be less than 0.5 m.