Experimental study on mechanical response of anchored fractured coal under cyclic dynamic loading

LI Zhen’an; LI Zhuang

doi:10.13347/j.cnki.mkaq.20221767

Safety in Coal Mines > 2024 > 55(10): 158-165. > DOI: 10.13347/j.cnki.mkaq.20221767

LI Zhen’an, LI Zhuang. Experimental study on mechanical response of anchored fractured coal under cyclic dynamic loading[J]. Safety in Coal Mines, 2024, 55（10）: 158−165. DOI: 10.13347/j.cnki.mkaq.20221767

Citation:

PDF (2916 KB)

Experimental study on mechanical response of anchored fractured coal under cyclic dynamic loading

LI Zhen’an^1,,
LI Zhuang²

1.
Jining Coal Mine Safety Production Monitoring and Monitoring Center, Jining 272000, China
2.
College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China

More Information

Received Date: September 29, 2022
Revised Date: July 11, 2024

Graphical Abstract

Abstract

Abstract

In order to understand the mechanical response and failure characteristics of anchored fractured coal body under cyclic dynamic load, the dynamic load impact test of anchored fractured coal under cyclic impact dynamic load was carried out by using the split Hopkinson pressure bar test system. The effects of cyclic dynamic load times and dynamic load impact strength on the stress-strain curves, bolt axial force and macroscopic failure of anchored fractured coal were analyzed. The results show that with the increase of dynamic load strain rate, the strength of anchorage specimen increases, but with the increase of dynamic load impact times, the strength of anchorage specimen decreases. When the impact input energy is constant, with the increase of impact times, the internal cracks of coal gradually expand or even fail, and the limiting force of bolt on coal expansion decreases. Under high energy impact, the bolt cannot hinder the initiation and expansion of the internal cracks in the anchored fractured coal body, and the overall instantaneous failure of the anchored coal body is prone to occur.
- cyclic dynamic load,
- anchor bolt support,
- deep coal mine roadway,
- mechanical response,
- characteristics of destruction

FullText(HTML)

References (20)

References

[1]	靖洪文,孟庆彬,朱俊福,等. 深部巷道围岩松动圈稳定控制理论与技术进展[J]. 采矿与安全工程学报,2020,37(3):429−442. JING Hongwen, MENG Qingbin, ZHU Junfu, et al. Theoretical and technical progress of stability control of broken rock zone of deep roadway surrounding rock[J]. Journal of Mining & Safety Engineering, 2020, 37(3): 429−442.
[2]	付玉凯,鞠文君,吴拥政,等. 高冲击韧性锚杆吸能减冲原理及应用研究[J]. 煤炭科学技术,2019,47(11):68−75. FU Yukai, JU Wenjun, WU Yongzheng, et al. Study on principle application of energy absorption and bump reduction of high impact toughness rock bolt[J]. Coal Science and Technology, 2019, 47(11): 68−75.
[3]	蒋力帅,马念杰,白浪,等. 巷道复合顶板变形破坏特征与冒顶隐患分级[J]. 煤炭学报,2014,39(7):1205−1211. JIANG Lishuai, MA Nianjie, BAI Lang, et al. Deformation and failure characteristics and roof caving hidden danger classification of roadways compound roof[J]. Journal of China Coal Society, 2014, 39(7): 1205−1211.
[4]	康红普,林健,吴拥政,等. 锚杆构件力学性能及匹配性[J]. 煤炭学报,2015,40(1):11−23. KANG Hongpu, LIN Jian, WU Yongzheng, et al. Mechanical performances and compatibility of rock bolt components[J]. Journal of China Coal Society, 2015, 40(1): 11−23.
[5]	单仁亮,彭杨皓,孔祥松,等. 国内外煤巷支护技术研究进展[J]. 岩石力学与工程学报,2019,38(12):2377−2403. SHAN Renliang, PENG Yanghao, KONG Xiangsong, et al. Research progress of coal roadway support technology at home and abroad[J]. Chinese Journal of Rock Mechanics and Engineering, 2019, 38(12): 2377−2403.
[6]	李建忠,康红普,高富强,等. 原岩应力场作用下的锚杆支护应力场及作用分析[J]. 煤炭学报,2020,45(S1):99−109. LI Jianzhong, KANG Hongpu, GAO Fuqiang, et al. Analysis of bolt support stress field and bolt support effect under in-situ stress field[J]. Journal of China Coal Society, 2020, 45(S1): 99−109.
[7]	康红普. 我国煤矿巷道围岩控制技术发展70年及展望[J]. 岩石力学与工程学报,2021,40(1):1−30. KANG Hongpu. Seventy years development and prospects of strata control technologies for coal mine roadways in China[J]. Chinese Journal of Rock Mechanics and Engineering, 2021, 40(1): 1−30.
[8]	侯朝炯,王襄禹,柏建彪,等. 深部巷道围岩稳定性控制的基本理论与技术研究[J]. 中国矿业大学学报,2021,50(1):1−12. HOU Chaojiong, WANG Xiangyu, BAI Jianbiao, et al. Basic theory and technology study of stability control for surrounding rock in deep roadway[J]. Journal of China University of Mining & Technology, 2021, 50(1): 1−12.
[9]	谭云亮,郭伟耀,赵同彬,等. 深部巷道动静载试验系统研制及初步应用[J]. 岩石力学与工程学报,2022,41(8):1513−1524. TAN Yunliang, GUO Weiyao, ZHAO Tongbin, et al. Development and application of a novel deep roadway test system with dynamic-static loading[J]. Chinese Journal of Rock Mechanics and Engineering, 2022, 41(8): 1513−1524.
[10]	史新帅,靖洪文,赵振龙,等. 大尺度三维巷道冲击地压灾变演化与失稳模拟试验系统研制与应用[J]. 岩石力学与工程学报,2021,40(3):556−565. SHI Xinshuai, JING Hongwen, ZHAO Zhenlong, et al. Development and application of a large scale 3D roadway rockburst disaster evolution and instability simulation test system[J]. Chinese Journal of Rock Mechanics and Engineering, 2021, 40(3): 556−565.
[11]	焦建康,鞠文君. 动载扰动下巷道锚固承载结构冲击破坏机制[J]. 煤炭学报,2021,46(S1):94−105. JIAO Jiankang, JU Wenjun. Burst failure mechanism of roadway anchorage bearing structure under dynamic load disturbance[J]. Journal of China Coal Society, 2021, 46(S1): 94−105.
[12]	潘俊锋,刘少虹,高家明,等. 深部巷道冲击地压动静载分源防治理论与技术[J]. 煤炭学报,2020,45(5):1607−1613. PAN Junfeng, LIU Shaohong, GAO Jiaming, et al. Prevention theory and technology of rock burst with distinguish dynamic and static load sources in deep mine roadway[J]. Journal of China Coal Society, 2020, 45(5): 1607−1613.
[13]	IVANOVIĆ A, STARKEY A, NEILSON R D, et al. The influence of load on the frequency response of rock bolt anchorage[J]. Advances in Engineering Software, 2003, 34(11−12): 697−705.
[14]	山世昌,吴拥政,付玉凯,等. 冲击载荷下加锚岩体抗剪力学特性[J]. 采矿与岩层控制工程学报,2021,3(4):20−29. SHAN Shichang, WU Yongzheng, FU Yukai, et al. Experimental study on shear mechanical properties of anchored rock mass under impact load[J]. Journal of Mining and Strata Control Engineering, 2021, 3(4): 20−29.
[15]	吴拥政,付玉凯,郝登云. 加锚岩体侧向冲击载荷下动力响应规律研究[J]. 岩石力学与工程学报,2020,39(10):2014−2024. WU Yongzheng, FU Yukai, HAO Dengyun. Study on dynamic response law of anchored rock mass under lateral impact loads[J]. Chinese Journal of Rock Mechanics and Engineering, 2020, 39(10): 2014−2024.
[16]	余伟健,吴根水,刘泽,等. 煤-岩-锚组合锚固体单轴压缩试验及锚杆力学机制[J]. 岩石力学与工程学报,2020,39(1):57−68. YU Weijian, WU Genshui, LIU Ze, et al. Uniaxial compression test of coal-rock-bolt anchorage body and mechanical mechanisms of bolts[J]. Chinese Journal of Rock Mechanics and Engineering, 2020, 39(1): 57−68.
[17]	邱鹏奇,宁建国,王俊,等. 冲击动载作用下加锚岩体抗冲时效试验研究[J]. 煤炭学报,2021,46(11):3433−3444. QIU Pengqi, NING Jianguo, WANG Jun, et al. Experimental study on EPRD (effectiveness for a given period to resistance dynamic load) of bolted rock under dynamic load[J]. Journal of China Coal Society, 2021, 46(11): 3433−3444.
[18]	李壮,王俊,宁建国,等. 预紧力对锚固体抗动载冲击能力影响的试验研究[J]. 中国矿业大学学报,2021,50(3):459−468. LI Zhuang, WANG Jun, NING Jianguo, et al. Experimental research on influence of pre-tension on dynamic load impact resistance of anchorage body[J]. Journal of China University of Mining & Technology, 2021, 50(3): 459−468.
[19]	王光勇,顾金才,陈安敏,等. 锚固洞室在顶爆作用下破坏形式及破坏过程研究[J]. 岩土工程学报,2015,37(8):1381−1389. doi: 10.11779/CJGE201508004 WANG Guangyong, GU Jincai, CHEN Anmin, et al. Failure modes and process of tunnels reinforced by rockbolts under top explosion[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(8): 1381−1389. doi: 10.11779/CJGE201508004
[20]	ZAKHAROV V N, TROFIMOV V A, FILIPPOV Y A. Numerical modeling of rock bolt support in case of rheological behavior of rock mass in deformation[J]. Journal of Mining Science, 2021, 57(6): 883−893. doi: 10.1134/S1062739121060016

Cited By

Get Citation

PDF

XML

Article views PDF downloads

Turn off MathJax

Article Contents

Abstract

References

Experimental study on mechanical response of anchored fractured coal under cyclic dynamic loading

Abstract

References

Catalog

Export File

Citation

Format

Content