全长黏结GFRP抗浮锚杆界面剪切特性试验研究

doi:10.13722/j.cnki.jrme.2017.1616

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摘要针对在中风化花岗岩中不同直径、不同锚固长度的钢筋和GFRP抗浮锚杆，依托现场拉拔破坏性试验，首次利用三重光纤光栅传感器串同步测得GFRP抗浮锚杆杆体、灌浆体中央和第二界面(灌浆体与岩体界面)轴向应力、剪应力分布形式，并借助改进的位移测试装置获取了锚杆杆体和灌浆体的相对滑移量，研究GFRP抗浮锚杆的多界面剪切特性。结果表明：GFRP抗浮锚杆体系协同作用较钢筋抗浮锚杆效果较好，直径28 mm、锚固长度4.5 m的GFRP抗浮锚杆极限承载力达400 kN，上拔量小，能够满足工程需要。GFRP抗浮锚杆灌浆体最大轴向应力仅为1 200～1 800 kPa，有效作用长度为1.5～1.8 m，且存在极大轴力衰减段；最大剪应力为160～260 kPa，有效作用长度为1.8 m左右，应力集中明显。第二界面最大轴向应力值仅为灌浆体内1/6，也存在极大轴力衰减段，且有向下移动的趋势；最大剪应力值为灌浆体内1/3，有效作用长度在1.2 m左右。试验结果揭示了GFRP抗浮锚杆的力学传递机制，进一步明确了锚杆杆体与灌浆体之间的锚固特性和黏结性能。

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	白晓宇1
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	张明义1
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	朱磊1
	王永洪1
	赵天杨1
	陈小钰1

关键词 ：岩石力学, 中风化花岗岩, GFRP抗浮锚杆, 三重光纤光栅传感器串, 剪应力, 现场试验

Abstract：The field pull-out tests were conducted to the steel rebar and GFRP anti-floating anchor with sockets of different lengths and diameters buried in medium weathered granite. The distribution of the axial force and shear stress in GFRP anti-floating anchor body，anchorage body center and second interface(anchorage body/rock) were synchronously measured with the triple fiber grating sensors. The relative slippage between the anchor and anchorage body was obtained by the improved slippage test device and the multi-interface shear behavior of GFRP anti-floating anchor was studied. The synergy between GFRP anti-floating anchors was found to be better than the steel anchor in anti-floating. The bearing capacity of the GFRP anchor with diameter of 28 mm，anchorage length of 4.5 mm was up to 400 kN and its pull-out displacement was small，which meet the engineering needs. The maximum axial force of GFRP anchor is only 1 200–1 800 kPa，with the effective length of 1.5–1.8 m，and has a section of axial force attenuation. The maximum shear stress is 160–260 kPa，with the effective length of 1.8 m and significant stress concentration. The maximum axial force of the second interface is 1/6 times that of anchorage body and the section of axial force attenuation also exists but with a downward trend. The maximum shear stress occurred at 1/3 in anchorage body，with the effective length of 1.2 m.

Key words： rock mechanics medium weathered granite GFRP anti-floating anchor triple fiber bragg grating sensor shear stress field test

引用本文:

白晓宇1，2，张明义1，2，朱磊1，王永洪1，赵天杨1，陈小钰1. 全长黏结GFRP抗浮锚杆界面剪切特性试验研究[J]. 岩石力学与工程学报, 2018, 37(6): 1407-1418.
BAI Xiaoyu1，2，ZHANG Mingyi1，2，ZHU Lei1，WANG Yonghong1，ZHAO Tianyang1，CHEN Xiaoyu1. Experimental study on shear characteristics of interface of full-bonding glass fiber reinforced polymer anti-floating anchors. , 2018, 37(6): 1407-1418.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2017.1616 或 http://www.rockmech.org/CN/Y2018/V37/I6/1407

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