螺纹钢锚杆楔形端部搅拌树脂锚固剂运移特征及锚固实验

doi:10.13722/j.cnki.jrme.2021.0544

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摘要锚固施工时在钻孔内搅拌树脂锚固剂属于隐蔽性工作，不易掌握搅拌后锚固剂的分布情况。采用理论分析、数值模拟及实验室实验相结合的方法，分析螺纹钢锚杆楔形端部形态对锚固剂搅拌效果的影响规律。理论分析表明，锚杆楔形搅拌端的切削角对锚固剂上的作用力及搅拌效果影响较大。锚杆楔形搅拌端会使锚固剂封袋顶部产生凹陷，在锚杆转动时增加了锚固剂所受的旋转力有助于破坏锚固剂封袋，提高树脂胶泥与固化剂的流动性；数值模拟分析发现，当双楔形角为75°、“一”字型尖端处有横肋、偏距C = 0时，螺纹钢锚杆楔形搅拌端上方锚固剂搅拌更均匀、流速更大、在锚固孔内扩散范围更广；同时，发现在锚杆楔形搅拌端的“一”字型尖端加制凹槽后，更有助于提升锚固剂的搅拌效率；由锚杆锚固性能实验可知，在对称双楔形角为75°的锚杆搅拌端加制凹槽后，拉拔力峰值的平均值提升约15%，相比原型锚杆试件拉拔力峰值的平均值提升了约36%。研究成果对于提高锚杆锚固质量、改善锚固性能具有一定的理论与工程应用价值。

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	刘少伟1
	2
	崔磊1
	马念杰3
	姜彦军4
	李永恩5
	张英6
	卢运海7

关键词 ：岩土工程, 螺纹钢锚杆, 锚杆楔形搅拌端, 树脂锚固剂, 运移特征, 端部形态改进

Abstract：During anchorage construction，stirring the resin in the borehole is a hidden work，so it is not easy to master the distribution of the resin after stirring. In this paper，through the combination of theoretical analysis，numerical simulation and laboratory experiments，the influence of the wedge-shaped end of rebar bolts on the stirring effect of the resin is analyzed. The theoretical analysis shows that the cutting angle of the wedge-shaped stirring end has a great influence on the force acting on the resin and the stirring effect. The wedge-shaped stirring end of the bolts will make the top of the bag of the resin concave and increase the rotation force of the resin when the bolts rotate，which will help to destroy the bag of the resin and to improve the fluidity of the resin. Numerical simulation shows that，in the case of a double wedge angle of 75°，ribs at the top of the “straight” type bolts and the offset C = 0，the stirring effect of the resin above the wedge-shaped stirring end of the bolts is more uniform，the flow velocity is larger and the diffusion range in the borehole is wider. At the same time，it is helpful to improve the stirring efficiency of the resin by adding a groove at the “straight” tip of the wedge-shaped stirring end of the bolts. According to the anchoring performance test of the bolts，it is found that after the stirring end of the bolts is added grooves，the average value of the peak pull-out force is increased by about 15% and by about 36% compared with the average peak pull-out force of the common bolts. The research results have certain theoretical and engineering application values for improving the anchoring quality and performance of bolts.

Key words： geotechnical engineering rebar bolts wedge-shaped end of bolts resin flow characteristics optimization of bolts end shape

引用本文:

刘少伟1，2，崔磊1，马念杰3，姜彦军4，李永恩5，张英6，卢运海7. 螺纹钢锚杆楔形端部搅拌树脂锚固剂运移特征及锚固实验[J]. 岩石力学与工程学报, 2022, 41(1): 40-52.
LIU Shaowei1，2，CUI Lei1，MA Nianjie3，JIANG Yanjun4，LI Yongen5，ZHANG Ying6，LU Yunhai7. Flow characteristics of stirring resin at wedge end of bolts and anchorage test. , 2022, 41(1): 40-52.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0544 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I1/40

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