岩土力学2012，Vol.33Issue(12)：3645-3652,8.
砂土中扩体锚杆承载特性模型试验研究
Model test research on bearing capacity characteristics of underreamed ground anchor in sand
摘要
Abstract
The effects of size and embedment depth of underreamed ground anchor under vertical pullout on its bearing capacity characteristics were researched through 25 model tests. The test results exhibited two different modes of underreamed ground anchor depending on depth/diameter ratio, namely shallow and deep underreamed ground anchor. During pullout, the two type underreamed ground anchors experienced several phases, such as soil elastic deformation, shear failure on normal anchor section-soil interface, soil elastoplastic deformation phase and shear failure as well. And they manifested general shear failure and local shear failure. In comparison between underreamed ground anchor and normal tension-type anchor, the test results indicated that in ultimate bearing capacity, bearing capacity ratio and safety, underreamed ground anchor had substantial superiority in comparison with normal tension-type anchor. In order to improve the bearing capacity, expanding diameter of underreamed section had more obvious advantages. Furthermore, there was an optimal diameter of underreamed section by the bearing capacity ratio analysis. So it is highly recommended to seek an optimal dimension of underreamed ground anchor to get more economic benefits in practice.关键词
扩体锚杆/深径比/极限承载力/承载比/砂土Key words
underreamed ground anchor/ depth/diameter ratio/ ultimate bearing capacity/ bearing capacity ratio/ sand分类
建筑与水利引用本文复制引用
郭钢,刘钟,邓益兵,杨松,马利军..砂土中扩体锚杆承载特性模型试验研究[J].岩土力学,2012,33(12):3645-3652,8.基金项目
新型扩体锚固技术及机具装备研发(No.财企[2012]171). （No.财企[2012]171）
