串联式锚板抗拔承载力及影响因素

Analysis of the Tensile Properties and Influencing Factors of Tandem Double Anchored Plates

基于室内模型试验对比研究了单锚板和串联式双锚板的拉拔性状。基于FLAC 3D有限差分软件,建立了串联式双锚板的拉拔性能数值模拟模型,获得了上拔力–上拔位移关系曲线,同时,对其影响因素进行了探讨。研究结果表明:1) 串联式双锚板的承载能力远大于单锚板。无论是单锚板或是串联式双锚板,上拔力–上拔位移关系的典型曲线为双曲线,且面积相同的圆形锚板的承载力远大于方形锚板。2) 土的强度参数对串联式双锚板上拔力–上拔位移关系影响明显。3) 对于串联式双锚板,在下锚板埋设深度一定,且为深埋锚板的条件下,土的重度对上拔力–上拔位移关系影响很小,同时,双锚板之间存在临界间距,当锚板间距大于临界间距,随着上锚板埋深增大,串联式双锚板的承载力增加。

In this paper,the drawing properties of single anchor plate and tandem double anchor plate are compared based on the indoor model experiment.The numerical simulation model for the pull-out property of the tandem double anchor plate is established by using FLAC 3D finite difference nu-merical simulation analysis software,and the relationship curve between the uplift force and uplift displacement is obtained.At the same time,the influencing factors are discussed.The results show that:1)The carrying capacity of the tandem double anchored plate is much higher than that of the single anchored plate.The typical curve of the relationship between the uplift force and uplift displacement is hyperbolic,and the bearing capacity of circular anchor plates with the same area is much larger than that of square anchor plates.2)Soil strength parameters have obvious influence on the relationship between uplift force and uplift displacement of the tandem double-anchored plates.3)For the tandem double anchoring plates,under the condition that the buried depth of the lower anchoring plates is constant and the depth of the anchoring plates is deep;the unit weight of soil has little effect on the relationship between uplift force and uplift displacement;at the same time,tandem double anchor plate exists critical spacing.The anchor plate spacing is greater than the critical spacing,as on the anchor plate depth increases,tandem double anchor plate bearing capacity increases.