新型伞状锚的抗拔性能  

Pull out resistance of a new type umbrella-shape anchor

作　　者：刘益[1] 梅国雄[1] 宋林辉[1] 宰金珉[1] 

机构地区：[1]南京工业大学土木工程学院,江苏南京210009

出　　处：《南京工业大学学报（自然科学版）》2009年第2期48-52,共5页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：江苏省六大人才高峰项目(06-F-014);江苏省建设系统科技计划项目(JS200416)

摘　　要：针对现有抗拔锚杆承载力过小的不足,设计出一种新型伞状抗拔锚,并运用模型试验手段分析其抗拔性能及受力特点.试验结果表明,新型伞状锚的抗拔性能优于同等条件下的传统抗拔桩,且伞状锚锚头灌浆后的效果最佳.结合有限元模拟,明确了伞状锚的抗拔力主要由锚头兜住的土体质量以及兜住与未兜住土体之间的抗剪强度提供.基于试验和数值模拟分析提出伞状锚的极限承载力特征值估算公式,为伞状锚的工程应用奠定了理论基础.A new type umbrella-shape anti-float anchor was designed and manufactured to improve the traditional anchors. The model test were adopted to analyze pull out resistance and the anti-float mechanism was defined by finite element analysis. Three pull out test results indicate that the anti-float performance of the new type anchors was superior to that of traditional vertical piles. Moreover, umbrella-shape anchor with grunting in anchor head is much better. According to the mechanical analysis of the umbrella-shape anchor, it was shown that the bearing capacity depended on the weight of soil seized by the anchor head and the shear strength along the interface between seized and unseized soils. Therefore, the ultimate bearing capacity estimation formula of the umbrella-shape anchor was used as foundation for the engineering application of umbrella-shape anchors.

关 键 词：伞状抗拔锚 抗拔性能 拉拔机理 抗剪强度 

分 类 号：TU473.1[建筑科学—结构工程]