BFRP抗浮锚杆抗拔性能现场试验与荷载传递特性  

Load transfer behavior of BFRP anti-floating anchors based on field pull-out tests

作　　者：白晓宇[1] 吴泽坤 王凤姣 孙淦 张明义[1] 闫楠[1] BAI Xiaoyu;WU Zekun;WANG Fengjiao;SUN Gan;ZHANG Mingyi;YAN Nan(School of Civil Engineering,Qingdao University of Technology,Qingdao,Shandong 266520,China)

机构地区：[1]青岛理工大学土木工程学院,山东青岛266520

出　　处：《岩石力学与工程学报》2024年第6期1335-1346,共12页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(51708316);山东省自然科学基金重点项目(ZR2020KE009);山东省泰山学者项目(tsqn202306234)。

摘　　要：玄武岩纤维增强聚合物(basalt fiber reinforced polymer,BFRP)锚杆具有自重轻、抗拉强度高、耐腐蚀性能好等优点,率先将BFRP锚杆应用于滨海某医院的地下室抗浮中。基于5根不同锚固长度、不同直径的全螺纹BFRP抗浮锚杆的极限抗拔试验,分析抗浮锚杆的破坏形态,明确锚杆杆体和锚固体的荷载-位移变化规律,探究BFRP抗浮锚杆杆体轴力和剪应力随锚固深度的分布规律,并讨论BFRP锚杆的破坏机制。研究表明:(1)2组BFRP抗浮锚杆的抗拔承载力均超过400 kN,完全满足工程的抗浮要求;(2)随着锚固长度与杆体直径的增加,抗浮锚杆的极限抗拔承载力略有增加,但杆体位移相应增大;(3)BFRP抗浮锚杆轴向应力在孔口处最大,随深度增加而加速降低,轴向应力的传递深度约为锚固长度的2/3,通过增加锚固长度来提升抗浮锚杆的抗拔承载力有限;(4)BFRP抗浮锚杆的剪应力先沿锚固深度迅速增加,在锚固深度0.75 m附近达到峰值后逐渐减小,剪应力峰值随荷载水平的增加而增大。试验结果为BFRP抗浮锚杆的应用奠定了基础。The basalt fiber reinforced polymer(BFRP)anchor rod has advantages such as lightweight,high tensile strength and excellent corrosion resistance.This study pioneers the application of BFRP anchor rods in the basement anti-floating of a coastal hospital.The ultimate pull-out tests were conducted on five full-threaded BFRP anti-floating anchor rods with different anchorage lengths and diameters.The failure modes of the anti-floating anchor rods were analyzed,and the load-displacement relationship of the anchor rod and the anchor body was determined.The distribution of the axial force and the shear stress along the depth of the BFRP anchor rod was investigated,and the failure mechanism of BFRP anchor rods was discussed.The research reveals that:(1)The ultimate pull-out capacity of both groups of BFRP anti-floating anchor rods exceeds 400 kN,fully satisfying the anti-floating requirements of the project.(2)With the increase in the anchorage length and the rod diameter,the ultimate pull-out capacity of the anti-floating anchor rods slightly increases,but the displacement of the rod also increases accordingly.(3)The axial stress of BFRP anchor rod is maximum at the hole opening and decreases with increasing the depth.The area of stress transfer extends approximately two-thirds of the anchorage length.It is limited to improve the pull-out bearing capacity of the anti-floating anchor road through increasing the anchorage length.(4)The shear stress in the BFRP anchor rod initially increases rapidly along the depth of the anchorage,and then gradually decreases after reaching a peak near the anchorage depth of 0.75 m.The peak shear stress increases with increasing the load level.The results of the study provide a foundation for the application of BFRP anti-floating anchor rods.

关 键 词：岩石力学 玄武岩纤维增强聚合物 BFRP抗浮锚杆 极限载荷试验 荷载传递 轴力 剪应力 

分 类 号：TU45[建筑科学—岩土工程]