Mechanical behaviour analysis of fully grouted GFRP rock bolts subjected to pre-tension load and blast dynamic load

被引：0
|
作者：
Wang W. [1 ]
Song Q. [1 ]
机构：
[1] Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Resources, School of Resource and Environmental Engineering, Wuhan University of Science and Technology, Wuhan, 430081, Hubei
来源：
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | 2019年 / 36卷 / 01期
关键词：
Blast load; Fully grouted rock bolt; GFRP rock bolt; Ground support; Mechanical behavior;
D O I：
10.13545/j.cnki.jmse.2019.01.019
中图分类号：
学科分类号：
摘要：
In order to analyze the mechanical behavior of glass-fiber-reinforced plastic (GFRP) rock bolt under the blast dynamic load, a new approach was proposed to describe the mechanical behaviour of fully grouted GFRP rock bolts under combined action of dynamic and static loads, the approach was applied to analyze the axial and shear stresses distribution characteristics of GFRP rock bolt under blast dynamic load, the paper analyzed the influence of the quantity of explosives, the distance between the point of interest and the blasting source and the Young's modulus of rock on the mechanical behaviour of GFRP bolts. It was found that large axial and shear stresses of fully grouted GFRP rock bolt are mainly distributed in a small region near the bolt collar, and the influence of the quantity of explosives on rock bolt is significant. The axial and shear stresses decreased quickly with the distance between the point of interest and the blasting source increased, for the case examined where the bolt is within the range of 10-15 meters from the blasting point, the influence of blast load on rock bolt is significant and the installed GFRP rock bolt is easy to break in the region near the bolt collar. With the increase of the Young's modulus of rock, the axial stress of rock bolt is decreased and the shear stress of rock bolt is increased firstly and then decreased. The predicted distributions of axial and shear stresses in the rock bolt under blast loads are consistent with published laboratory results and the field test results of GFRP rock bolts. The proposed model provides a method to quantitatively evaluate the effect of blasting on the mechanical behavior of GFRP rock bolts so that a better ground support system can be designed in practical mining applications. © 2019, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.
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页码：140 / 148
页数：8
相关论文
共 30 条
  • [1] Kovari K., History of the sprayed concrete lining method-part II: milestones up to the 1960s, Tunnelling and Underground Space Technology, 18, 1, pp. 71-83, (2003)
  • [2] Bai X., Zhang M., Li W., Et al., Laboratory test study and mechanism analysis of external anchorage performance of GFRP anti-floating anchors, Journal of Central South University(Science and Technology), 46, 10, pp. 3841-3847, (2015)
  • [3] Wang W., Ma X., Ma S., Et al., The GFRP bolt support test in Jinshandian iron mine and the existing problem, Metal Mine, 41, 10, pp. 1-4, (2012)
  • [4] Yang Z., Gu J., Yang B., Numerical analysis of reinforcement effects and response to dynamic loads characteristics of rock bolts, Rock and Soil Mechanics, 30, 9, pp. 2805-2809, (2009)
  • [5] Shan R., Zhou J., Xia Y., Et al., Experimental investigation on dynamic response of rock bolt under blasting load, Chinese Journal of Rock Mechanics and Engineering, 30, 8, pp. 1540-1546, (2011)
  • [6] Shan R., Zhou J., Xia Y., Et al., Axial stress distribution of grouted rock bolts subjected to blast loading, Rock and Soil Mechanics, 32, 10, pp. 2965-2971, (2011)
  • [7] Zhou J., Wang X., Jia Z., Vibration rule and damage of anchorage structure subjected to blasting using model test, Chinese Journal of Rock Mechanics and Engineering, 32, 6, pp. 1257-1263, (2013)
  • [8] Liu S., Pan J., Mao D., Et al., Experiment research on axial force quantitative loss law of anchor bolt inblasting in highimpact danger roadway, Journal of China Coal Society, 41, 5, pp. 1120-1128, (2016)
  • [9] Yi C., Lu W., Research on influence of blasting vibration on grouted rock bolt, Rock and Soil Mechanics, 27, 8, pp. 1312-1316, (2006)
  • [10] Wang G., Zhang S., Xie W., Et al., Numerical analysis of dynamic response and axial stress distribution of rock bolts under explosive loads, Journal of Mining & Safety Engineering, 26, 1, pp. 114-117, (2009)
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