多循环荷载下BFRP抗浮锚杆锚固性能现场试验

doi:10.13722/j.cnki.jrme.2023.1210

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摘要玄武岩纤维增强聚合物(basalt fiber reinforced polymer，BFRP)锚杆凭借抗拉强度高、耐腐蚀性好等优点，可代替传统钢筋锚杆解决抗浮锚杆在腐蚀性环境中的耐久性问题，本次试验采用循环加载方式，对不同锚固长度、不同直径的全螺纹BFRP锚杆承载性能开展研究。结果表明：循环荷载作用下锚杆杆体及锚固体荷载–位移曲线呈现滞回状，卸载时锚杆位移回弹率较高，BFRP抗浮锚杆弹性工作性状明显。锚杆杆体受循环荷载作用出现损伤，相同锚固深度锚杆杆体应变随循环次数的增加而增大；不同锚固深度的锚杆，随循环荷载次数增加，锚杆杆体应变增幅及每级荷载卸荷后产生的塑性变形逐渐增大，且锚杆杆体应变向深部传递。BFRP抗浮锚杆杆体轴力从孔口处自上而下衰减，杆体轴力作用范围在距孔口向下2.5 m范围内，循环荷载次数增加导致锚杆轴力增大，传递深度更深，但自孔口向下0.5～1.0 m范围锚杆杆体轴力衰减值随循环次数增加逐渐减小。锚杆杆体轴应力变化量受循环荷载影响较大，不同循环荷载作用下锚杆杆体轴应力变化量存在峰值。BFRP抗浮锚杆剪应力随锚固深度增加迅速增大，在孔口以下深度0.75 m处达到峰值后逐渐减小，剪应力峰值随循环次数增加出现衰减趋势。

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	吴泽坤1
	白晓宇1
	孙淦1
	王凤姣1
	闫楠1
	董旭光2

关键词 ：桩基工程, BFRP抗浮锚杆, 循环加载试验, 荷载传递, 损伤, 轴力, 剪应力

Abstract：Basalt fiber reinforced polymer(BFRP) anchors have the advantages of high tensile strength and good corrosion resistance，which can replace the traditional steel anchors to solve the durability problem of anti-floating anchors in corrosive environment. In this test，cyclic loading was used to study the load carrying performance of fully threaded BFRP anchors with different anchorage lengths and diameters. The results show that the load-displacement curves of anchor rod and anchor solid under cyclic loading present hysteresis. The anchor displacement rebound rate is high when unloading，and the elasticity of BFRP anti-floating anchors is obvious. Anchor rod is damaged by cyclic loading，and the strain of anchor rod with the same anchorage depth increases with the increase of cyclic times. For anchors with different anchorage depths，with the increase of cyclic loading times，the strain increase of the anchor rod body and the plastic deformation generated after unloading of each level of loading gradually increased，and the strain of the anchor rod body was transferred to the deeper part of the anchor body. The axial force of BFRP anti-floating anchors? rods attenuated from the mouth of the aperture from the top to the bottom，and the range of the rods? axial force was in the range of 2.5 m from the mouth of the aperture downward. The increase in the number of cyclic loadings resulted in an increase in the anchor rod axial force and a deeper transfer depth，but the attenuation value of the anchor rod axial force in the range of 0.5–1.0 m downward from the orifice gradually decreased with the increase in the number of cycles. The amount of change of axial stress of anchor rods is greatly affected by cyclic loading，and there is a peak value of change of axial stress of anchor rods under different cyclic loading.The shear stress of BFRP anti-floating anchors increases rapidly with the increase of anchorage depth，and reaches the peak value at the depth of 0.75 m below the mouth of the borehole，and then decreases gradually，and the peak value of the shear stress appears to be attenuated with the increase of the number of cycles.

Key words： pile foundation BFRP anti-float anchor cyclic loading test load transfer damage axial force；shearing stress

引用本文:

吴泽坤1，白晓宇1，孙淦1，王凤姣1，闫楠1，董旭光2. 多循环荷载下BFRP抗浮锚杆锚固性能现场试验[J]. 岩石力学与工程学报, 2024, 43(9): 2314-2328.
WU Zekun1，BAI Xiaoyu1，SUN Gan1，WANG Fengjiao1，YAN Nan1，DONG Xuguang2. Field test of anchorage performance of BFRP anti-floating anchors under multiple cyclic loads. , 2024, 43(9): 2314-2328.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.1210 或 https://rockmech.whrsm.ac.cn/CN/Y2024/V43/I9/2314

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