全长黏结非金属抗浮锚杆体系设计方法研究

Research on design method of full-length bonded non-metal anti-floating anchor system

从全长黏结非金属抗浮锚杆的作用机理和破坏模式出发,对非金属抗浮锚杆的选型、内锚固段设计、外锚固段设计以及稳定性验算进行论述。研究结果表明:在锚杆选型中,应充分利用直径小、强度高的GFRP抗浮锚杆替代大直径钢筋锚杆;在外锚固设计中,明确了内锚固段极限黏结长度的计算方法,提出了机械锚固、金属-GFRP混合连接以及不同直径锚筋连接的设计方法,为抗浮工程设计提供了新思路;在内锚固设计中,建议在保证锚杆抗拔承载力的前提下,适当缩短锚固段长度;在抗浮稳定性设计中,应采用综合安全系数法和分项系数表达方式进行抗浮体系验算。

Based on the mechanism and failure mode of full-length bonded non-metallic anti-floating anchor, the selection of non-metallic anti-floating anchor, the design of internal and external anchorage sections and the stability checking calculation were discussed. The results show that GFRP anti-floating anchor with small diameter and high strength should be fully used to replace large diameter steel anchor in anchor selection. In the external anchorage design, the calculation method of the ultimate bond length of the internal anchorage section is clarified,and the design methods of mechanical anchorage, metal-GFRP hybrid connection and different diameter anchor bar connection are proposed, which provides a new idea for anti-floating engineering design. In the internal anchorage design, it is suggested that the anchorage length should be appropriately shortened on the premise of ensuring the uplift bearing capacity of the anchor. In the design of anti-floating stability, the comprehensive safety factor method and the expression of partial coefficient should be used to check the anti-floating system.