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玻璃纤维复材(GFRP)筋与砂浆的黏结性能是其应用于土钉支护结构中重要的参数。对6组不同直径和不同埋深的GFRP筋砂浆拉拔试件进行单调和循环拉拔试验,研究GFRP筋与砂浆黏结性能。结果表明:GFRP筋在砂浆中的拉拔破坏模式与长度锚固相关;砂浆强度对20筋体极限黏结强度影响不大,而对22、25筋体的黏结强度发挥有影响;分级循环加载拉拔中,黏结滑移曲线均会发生斜率的变化,且在拉拔力卸载后出现一段残余变形,存在非线性变形,在化学胶着力消失后,滑动摩擦力与机械咬合力呈现线性特征;GFRP筋与砂浆黏结滑移本构模型中,τ-s曲线上升段与改进的BPE模型的上升段趋势吻合,但还需进一步研究模型参数。
Bonding properties between glass fiber reinforced plastic (GFRP) bars and mortar are important parameters in the application of soil nailing support structure. Six groups of GFRP tendons with different diameters and different depths were pulled for monotonic and cyclic drawing tests to study the bonding properties between GFRP bars and mortar. The results show that the failure mode of GFRP tendon in mortar is related to the length of anchorage. The mortar strength has little effect on the ultimate bond strength of 筋20 tendon but affects the bond strength of 22 and 25 tendons. The grading cycle In the process of loading and drawing, the slope of the bond-slip curve will change, and a residual deformation occurs after the unloading of the drawing force, and there is a nonlinear deformation. After the chemical adhesion disappears, the sliding friction and mechanical occlusion force show a linear characteristic In the constitutive model of GFRP tendon-mortar bond-slip model, the ascending trend of τ-s curve agrees with that of the improved BPE model, but the model parameters need to be further studied.