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| Flow characteristics of stirring resin at wedge end of bolts and anchorage test |
| LIU Shaowei1，2，CUI Lei1，MA Nianjie3，JIANG Yanjun4，LI Yongen5，ZHANG Ying6，LU Yunhai7 |
| (1. School of Energy Science and Engineering，Henan Polytechnic University，Jiaozuo，Henan 454000，China；2. State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization，Jiaozuo，Henan 454000，China；3. School of Energy and Mining Engineering，China University Mining and Technology(Beijing)，Beijing 100083，China；4. Xinzheng Coal Electricity Zhengzhou Coal Industry Group，Zhengzhou，Henan 451184，China；5. Department of Coal Management，Shenhua Guoneng Group Co.，Ltd.，China Coal Technology，Beijing 100033，China；6. Zhongyun International Engineering Co.，Ltd.，Zhengzhou，Henan 450000，China；7. Sichuan Coal Industry Group Limited Liability Company，Chengdu，Sichuan 610031，China) |
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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.
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2022, Vol. 41 
