Experimental study on scale characteristics and energy dissipation law of dynamic broken blocks of deep sandstone based on 3D scanning

被引：0
|
作者：
Zhang Q. [1 ,2 ,3 ]
Niu L. [1 ]
Yuan L. [2 ,3 ]
Zheng T. [1 ]
Wang X. [1 ]
Li L. [1 ]
机构：
[1] School of Civil Engineering and Construction, Anhui University of Technology, Huainan
[2] Institute of Energy, Hefei Comprehensive National Science Center, Hefei
[3] State Key Laboratory of Deep Coal Mining Response and Disaster Prevention and Control, Anhui University of Technology, Huainan
来源：
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | 2022年 / 39卷 / 06期
关键词：
3D scanning and digital image technology; Dynamic compression test; Energy dissipation; Specific surface area; Split Hopkinson Pressure Bar;
D O I：
10.13545/j.cnki.jmse.2022.0398
中图分类号：
学科分类号：
摘要：
Under different impact loads, rocks are broken into blocks or particles of different sizes. In order to quantitatively study the energy absorption characteristics of rocks under dynamic loading and the scale characteristics of dynamically broken blocks, the separated Hopkinson pressure bar (SHPB) dynamic compression test was conducted on sandstone deep in coal mines. The dynamic compression strength laws of rock specimens under different impact loads were obtained, and the effects of incident energy on the absorbed energy densities of specimens and strain rate effects were explored. On this basis, the 3D scanning model of the crushed block was obtained by using 3D scanning technology and digital image processing technology, and the relationship between the scale characteristics of the crushed block and the absorbed energy of the sandstone specimen was explored. The study shows that: the dynamic compressive strength and absorbed energy of sandstone specimens have obvious strain rate effects, and the dynamic compressive strength and dynamic strain rate are approximately linear, while the absorbed energy shows an exponential relationship; the absorbed energy of the specimens differs at different incident energies, and the absorbed energy shows a linear increase with the incident energy; in the range of strain rate of 54-221.9 s-1, the 3D scanning technology can With the increase of impact load and input energy, the shape of broken block of specimen is gradually enriched, the particle size of broken block gradually decreases, block breaking. The broken shape and energy dissipation of brittle materials are the rate effect mechanism of materials. © 2022, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.
引用
收藏
页码：1218 / 1226
页数：8
相关论文
共 25 条
  • [1] PAN Yishan, DAI Lianpeng, LI Guozhen, Et al., Study on compound disaster of rock burst and roof falling in coal mines, Journal of China Coal Society, 46, 1, pp. 112-122, (2021)
  • [2] DOU Linming, WANG Shengchuan, GONG Siyuan, Et al., Cloud platform of rock-burst intelligent risk assessment and multi-parameter monitoring and early warning, Journal of China Coal Society, 45, 6, pp. 2248-2255, (2020)
  • [3] XIE Heping, Research review of the state key research development program of China:Deep rock mechanics and mining theory, Journal of China Coal Society, 44, 5, pp. 1283-1305, (2019)
  • [4] LI Xibing, GONG Fengqiang, Research progress and prospect of deep mining rock mechanics based on coupled static-dynamic loading testing, Journal of China Coal Society, 46, 3, pp. 846-866, (2021)
  • [5] XIA Kaiwen, WANG Shuai, XU Ying, Et al., Advances in experimental studies for deep rock dynamics, Chinese Journal of Rock Mechanics and Engineering, 40, 3, pp. 448-475, (2021)
  • [6] LIU Xiling, CUI Jiahui, WANG Jinpeng, Et al., Acoustic emission characteristics analysis of rock under impact loading of different strain rate, Blasting, 35, 1, pp. 1-8, (2018)
  • [7] LUO Y, WANG G, LI X P, Et al., Analysis of energy dissipation and crack evolution law of sandstone under impact load, International Journal of Rock Mechanics and Mining Sciences, 132, pp. 1-12, (2020)
  • [8] YU Yongqiang, ZHANG Wenlong, FAN Lidan, Et al., Strain rate effect and energy dissipation characteristics of sandstone in coal measures under impact loading, Journal of China Coal Society, 46, 7, pp. 2281-2293, (2021)
  • [9] DENG Y, CHEN M, JIN Y, Et al., Theoretical analysis and experimental research on the energy dissipation of rock crushing based on fractal theory, Journal of Natural Gas Science and Engineering, 33, pp. 231-239, (2016)
  • [10] LI Chengjie, XU Ying, YE Zhouyuan, Energy dissipation and crushing characteristics of coal-rock-like combined body under impact loading, Chinese Journal of Geotechnical Engineering, 42, 5, pp. 981-988, (2020)
123