Impact dynamic testsfor rock-coal-rock combination under different strain rates

被引：0
|
作者：
Miao L. [1 ,2 ]
Niu Y. [3 ]
Shi B. [1 ]
机构：
[1] School of Mining and Safety Engineering, Anhui University of Science and Technology, Huainan
[2] College of Energy and Transportation Engineering, Jiangsu Vocational Institute of Architectural Technology, Xuzhou
[3] College of Rail Transit, Jiangsu Province Xuzhou Technician Institute, Xuzhou
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2019年 / 38卷 / 17期
关键词：
Dynamics; Fractal dimension; Rock-coal-rock combination; Split Hopkinson pressure bar; Strain rate;
D O I：
10.13465/j.cnki.jvs.2019.17.018
中图分类号：
学科分类号：
摘要：
Here, in order to study dynamic properties of a rock-coal-rock combination,uniaxial dynamic impact compression tests were conductedfor the combination specimen using a split Hopkinson pressure bar (SHPB) with diameter of 75 mm under 5 different strain rates.The results showed that relations between air pressure and bullet velocity, bullet velocity and strain rate, strain rate and dynamic elastic modulus, strain rate and dynamic compressive strength as well as strain rate and fractal dimension areapproximately linear, respectively; when the specimen's σ-ε curve rises almostlinearly to about 75% of peak stress, with increase in stress, the curveslope gradually decreases until reaching peak stress; after the specimen is broken, the curve hasa precipice-like descent; the rock-coal-rock combination splits axiallyin loading direction during lower strain rate; but with increase in strain rate,distributionof rock blocks is gradually fine-grained; with increase in its broken degree, rock block fractal dimension rises linearly. © 2019, Editorial Office of Journal of Vibration and Shock. All right reserved.
引用
收藏
页码：137 / 143
页数：6
相关论文
共 18 条
  • [1] Xie H., Zhou H., Xue D., Et al., Research and consideration on deep coal mining and critical mining depth, Journal of China Coal Society, 37, 4, pp. 535-542, (2012)
  • [2] Qi Q., Li H., Deng Z., Et al., Studying of standard system and theory and technology of rock burst in domestic, Coal Minging Technology, 22, 1, pp. 1-5, (2017)
  • [3] Shan R., Cheng R., Gao W., Study on dynamic constitutive model of anthracite of Yunjialing coal mine, Chinese Journal of Rock Mechanics and Engineering, 25, 11, pp. 2258-2263, (2006)
  • [4] Li H., Liu D., Huang Y., Et al., Tests for time effect on concrete dynamic mechanical property under high temperature, Journal of Vibration and Shock, 34, 13, pp. 182-194, (2015)
  • [5] Liu X., Zhang R., Liu J., Dynamic test study of coal rock under different strain rates, Journal of China Coal Society, 37, 9, pp. 1528-1534, (2012)
  • [6] Xie H., Gao F., Zhou H., Et al., Fractal fracture and fragmentation in rocks, Journal of Disaster Prevention and Mitigation Engineering, 23, 4, pp. 1-9, (2003)
  • [7] Ma D., Ma Q., Yuan P., Et al., Comparison analysis and SHPB tests on artificial frozen clayin uniaxial load and confining pressure states, Journal of Vibration and Shock, 36, 19, pp. 255-260, (2017)
  • [8] Yang R., Chen J., Xiao C., Et al., A method to calculate the dynamic compressive strength of rock with single specimen, Journal of Vibration and Shock, 37, 4, pp. 123-127, (2018)
  • [9] Li X., Gong F., Zhao J., Et al., Test study of impact failure of rock subjected to one-dimensional coupled static and dynamic loads, Chinese Journal of Rock Mechanics and Engineering, 29, 2, pp. 251-260, (2010)
  • [10] Liu S., Qin Z., Lou J., Experimetal study of dynamic failure characteristics of coal-rock compound under one-dimensional static and dynamic loads, Chinese Journal of Geotechnical Engineering, 33, 10, pp. 2064-2075, (2014)
12