附肢土层抗拔锚杆承载性能试验研究  

Bearing performance of new uplift anchor with side branches

作　　者：杨明辉[1] 邹航[1] 赵明华[1] 罗宏[1] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082

出　　处：《中南大学学报（自然科学版）》2015年第12期4634-4639,共6页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51278184);教育部博士点基金资助项目(20070532008);湖南大学青年教师成长基金资助项目(2015)~~

摘　　要：针对传统抗拔锚杆抗拔性能的不足,研发一种附肢土层抗拔锚杆。该锚杆由锚索及与之呈一定角度的侧边附肢组成,附肢通过锲入周边土体,与土体相互作用而达到提高锚杆承载力的目的。首先开展不同附肢数量、不同附肢角度的附肢抗拔锚杆与传统抗拔锚杆的室内承载性能对比试验。在此基础上,分析附肢抗拔锚杆的承载机理,并提出承载力特征值的估算公式。研究结果表明:附肢抗拔锚杆承载性能明显优于传统抗拔锚杆的承载性能,其承载能力可得到大幅度提升。附肢抗拔锚杆承载过程可分为3阶段,其承载能力主要由锚杆与周围土体间的摩阻力、锚固体自重以及附肢所兜土体与周围土体间的摩阻力三者组成。Considering the deficiencies of traditional uplift anchor, a new kind of uplift anchor with branches attached to soil was developed. The uplift anchor was composed of the anchor and angled side branches. With its branches carving into and interacting with the surrounding soil, the carrying capacity of uplift anchor was improved. Uplift behavior comparison tests were carried out between uplift anchors with different side branches and different angles and traditional uplift anchors. On this basis, the work mechanism of new uplift anchor was analyzed, and the estimation formula of ultimate bearing capacity to facilitate its engineering applications was proposed. The results show that the new uplift behavior performance is significantly better than that of the traditional anchor, and that its carrying capacity can be greatly improved. The loading process of uplift anchor with side branches can be divided into three stages, the carrying capacity is mainly composed of friction between anchor and its surrounding soil, the weight of anchoring body, the friction between the soil pocketed by branches and its surrounding soil.

关 键 词：抗拔锚杆 附肢 抗拔试验 承载性能 

分 类 号：TU473[建筑科学—结构工程]