Abstract：To investigate the load-carrying performance and load transfer mechanism of glass fiber reinforced polymer micro uplift piles (GFRP-MUP), field ultimate load tests were conducted on both GFRP-MUP and steel-bar micro uplift piles (SB-MUP). Based on the field tests and numerical simulations, the damage evolution characteristics of the anchored solid were revealed. The study demonstrates that: (1) The average destructive load of GFRP-MUP can reach up to 941.7 kN, approximately 1.73 times the bearing capacity of SB-MUP of the same specification, fully meeting the project’s flotation resistance requirements in terms of pullout bearing capacity. (2) Under extreme loading conditions, the GFRP-MUP anchorage body was pulled out with an average displacement of 26.1 mm, identifying the anchorage body-rock interface as the weak part of the anchoring system. (3) The shear stress of the anchor bars in both materials of micro uplift piles initially increases and then decreases, with the highest shear stress at the GFRP bar-anchorage body interface reaching 4.30 MPa. This indicates that GFRP bars can serve as a suitable substitute for steel bars in anti-buoyancy structures. (4) Damage to the GFRP-MUP anchorage body under extreme load is primarily concentrated within 2.7 meters below the orifice. Compared with SB-MUP, it is preferable to use micro uplift piles with shorter anchorage lengths and larger anchorage diameters to control the overall displacement of the anti-buoyancy structure and enhance anchorage efficiency.
白晓宇，张英杰，吴泽坤，孙 淦，刘俊伟，闫 楠. GFRP筋微型抗拔桩承载性能与荷载传递机制[J]. 岩石力学与工程学报, 2025, 44(6): 1624-1635.
BAI Xiaoyu, ZHANG Yingjie, WU Zekun, SUN Gan, LIU Junwei, YAN Nan. The bearing capacity and load transfer mechanism of GFRP bar micro uplift pile. , 2025, 44(6): 1624-1635.
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2025, Vol. 44 
