朱磊　张明义　白晓宇　王永洪　赵天杨

摘要：

通过现场拉拔破坏性试验，测得不同直径的GFRP抗浮锚杆在基础底板内的极限承载力和滑移量，并与实际工程中不同形式的钢筋抗浮锚杆作比较，分析其承载性能和粘结特性。研究表明，在相同的混凝土强度与养护条件下，相同直径的GFRP抗浮锚杆的极限承载力、平均粘结强度与钢筋抗浮锚杆相比较高，且GFRP抗浮锚杆的变形能够满足实际工程需求，充分验证了GFRP材料用作抗浮锚杆的先进性与合理性。基于试验结果与理论分析，给出了GFRP抗浮锚杆与基础底板的最佳锚固面积，并提出了计算公式。

关键词：

GFRP抗浮锚杆；承载力；锚固性能；最佳锚固面积；平均粘结强度

中图分类号：TU470

文獻标志码：A文章编号：16744764（2017）02010708

Abstract：

Through spot pullout destructive test， ultimate bearing capacity and slippage in the foundation slab of GFRP antifloating anchors with different diameter were monitored. Compared with some kinds of steel antifloating anchors in the actual engineering， their bearing performance and bond behavior were analyzed. The results showed that under the same strength and curing condition of the concrete， ultimate bearing capacity of GFRP antifloating anchor was larger than steel antifloating anchor with same diameter， the average bond strength between GFRP antifloating anchor and foundation slab was higher than the steel antifloating anchor， moreover the deformation of GFRP antifloating anchor can meet the engineering requirements， all of those fully verify that GFRP material as an antifloating anchor was advanced and reasonable. Based on the experimental results and theoretical analysis， the best anchoring area between GFRP anchor and foundation slab was determined， the computational formula was proposed.

Keywords：

GFRP antifloating anchor； bearing capacity； anchorage performance；the best anchoring area；the average bond strength

锚杆结构以其优越的经济性和较高的可靠性，被广泛应用于地下抗浮工程，特别是大型地下工程。建筑抗浮工程常位于地下水位以下，锚杆结构因受到地下水中酸、碱离子等的腐蚀作用，而不断锈蚀、老化，致使其耐久性降低，进而影响建筑物的安全性[12]。玻璃纤维增强聚合物（GFRP）锚杆是近年来发展运用的新型材料锚杆，它具有抗拉强度高、抗腐蚀性能好、抗电磁干扰能力强及松弛性低等优点[3]。由GFRP锚杆在腐蚀环境[4]、砂浆[56]和混凝土[79]中的诸多试验研究结果可知，将其应用于抗浮工程中不仅可以从根本上解决建（构）筑物抗浮锚杆的耐久性问题，而且解决了地铁等城市轨道交通建设项目中因杂散电流存在而不能使用抗浮锚杆的问题。……