一维动静组合加载下磁铁矿石力学特性及破碎特征试验研究

doi:10.13722/j.cnki.jrme.2021.0148

Abstract
Figure/Table
References (0)
Related Citation (15)

Download: PDF (5133 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract To improve the rock crushing efficiency and reducing energy consumption of ore，the dynamic mechanical properties and breakage behaviour of magnetite under one-dimensional coupled dynamic and static loads were studied using the improved Hopkinson pressure bar(SHPB) apparatus. The effects of axial compression ratio and impact velocity on the crushing effect and energy utilization rate of magnetite ore were analysed. Results show that impact velocity mainly affects the impact resistance and crushing degree of magnetite ore. The smaller the sample fragmentation the more significant the influence of axial compression and the larger the cumulative strain，when the axial compression ratio is constant，with impact velocity increasing. The larger the axial compression ratio，the larger the cumulative strain increases. The axial compression ratio mainly affects the damage degree of the inner structure before the dynamic impact and the energy utilization rate of impact load of the magnetite ore. With axial compression ratio increasing，the dynamic compressive strength of magnetite samples has a maximum value. Under one-dimensional combined dynamic and static loading，the crushing effect and energy utilization rate of magnetite ore are controlled by axial compression ratio and impact velocity. The impact resistance of magnetite ore is enhanced by“low axial compression + high velocity”. The compression and shear effect of“high axial compression + low velocity”is not significant and the crushing effect is poor. “High axial compression + high velocity”makes the sample broken into a large number of debris powder，which has good crushing effect with low energy utilization rate. When the“extrusion + impact”rock breaking method is used to improve the crushing effect and energy utilization rate of magnetite ore，the optimal combination of axial compression ratio and impact velocity should be put forward on the premise of clear crushing fragmentation requirements and considering the combined effect of axial compression ratio and impact velocity comprehensively.

Key words： rock mechanics magnetite one-dimensional coupled dynamic and static loads axial compression ratio dynamic mechanical property broken characteristics

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	LIU Zhiyi1
	2
	GAN Deqing1
	2
	YU Zehao1
	2
	TIAN Xiaoxi1
	2
	WANG Ling1
	2

Cite this article:

LIU Zhiyi1,2,GAN Deqing1, et al. Experimental research on the dynamic mechanical properties and breakage behavior of magnetite under one-dimensional coupled dynamic and static loads[J]. , 2022, 41(S1): 2869-2880.

URL:

https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0148 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/IS1/2869

[1] 李夕兵，周子龙，王卫华. 岩石破碎工程发展现状与展望[C]// 2009—2010 岩石力学与岩石工程学科发展报告. 北京：[s. n.]，2010：142–149.(LI Xibing，ZHOU Zilong，WANG Weihua. The status and prospect of development in rock fragmentation engineering[C]// Report on the Development of Rock Mechanics and Rock Engineering Discipline in 2009—2010. Beijing：[s. n.]，2010：142–149.(in Chinese))
[2] GAN D Q，GAO F，ZHANG Y P，et al. Effects of the shape and size of irregular particles on specific breakage energy under drop Weight Impact[J]. Shock and Vibration，2019，(6)：1–14.
[3] HASSANI F，NEKOOVAGHT P M，GHARIB N. The influence of microwave irradiation on rocks for microwaveassisted underground excavation[J]. Journal of Rock Mechanics and Geotechnical Engineering，2016，8(1)：1–15.
[4] CHRISTENSEN R J，SWANSON S R，BROWN W S. Split-Hopkinson- bar tests on rock under confining pressure[J]. Experimental Mechanics，1972，12(11)：508–513.
[5] 李夕兵，宫凤强，王少锋，等. 深部硬岩矿山岩爆的动静组合加载力学机制与动力判据[J]. 岩石力学与工程学报，2019，38(4)：708–723.(LI Xibing，GONG Fengqiang，WANG Shaofeng，et al. Coupled static-dynamic loading mechanical mechanism and dynamic criterion of rockburst in deep hard rock mines[J]. Chinese Journal of Rock Mechanics and Engineering，2019，38(4)：708–723.(in Chinese))
[6] LI X B，GONG F Q，TAO M，et al. Failure mechanism and coupled static-dynamic loading theory in deep hard rock mining：A review[J]. Journal of Rock Mechanics and Geotechnical Engineering，2017，9(4)：767–782.
[7] 李夕兵，周子龙，叶州元，等. 岩石动静组合加载力学特性研究[J]. 岩石力学与工程学报，2008，27(7)：1 387–1 395.(LI Xibing，ZHOU Zilong，YE Zhouyuan，et al. Study of rock mechanical characteristics under coupled static and dynamic loads[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(7)：1 387–1 395.(in Chinese))
[8] LI X B，ZHOU Z L，LOK T S，et al. Innovative testing technique of rock subjected to coupled static and dynamic loads[J]. International Journal of Rock Mechanics and Mining Sciences，2008，45(5)：    739–748.
[9] 左宇军，李夕兵，唐春安，等. 二维动静组合加载下岩石破坏的试验研究[J]. 岩石力学与工程学报，2006，25(9)：1 809–1 820.(ZUO Yujun，LI Xibing，TANG Chun?an，et al. Experimental investigation on failure of rock subjected to 2D dynamic-static coupling loading[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(9)：1 809–1 820.(in Chinese))
[10] 殷志强，李夕兵，董陇军，等. 动静组合加载条件岩爆特性及倾向性指标[J]. 中南大学学报：自然科学版，2014，45(9)：3 249–3 256. (YIN Zhiqiang，LI Xibing，DONG Longjun，et al. Rockburst characteristics and proneness index under coupled static and dynamic loads[J]. Journal of Central South University：Science and Technology，2014，45(9)：3 249–3 256.(in Chinese))
[11] 宫凤强，张乐，李夕兵，等. 不同预静载硬岩在动力扰动下断裂特性的试验研究[J]. 岩石力学与工程学报，2017，36(8)：1 841–1 854. (GONG Fengqiang，ZHANG Le，LI Xibing，et al. Experimental study on fracture behaviors of hard rock under dynamic disturbance with different pre-static loads[J]. Chinese Journal of Rock Mechanics and Engineering，2017，36(8)：1 841–1 854.(in Chinese))
[12] GONG F Q，SI X F，LI X B，et al. Experimental investigation of strain rockburst in circular caverns under deep three-dimensional high-stress conditions[J]. Rock Mechanics and Rock Engineering，2018，52：    1 459–1 474.
[13] 宫凤强，李夕兵，刘希灵. 三轴SHPB加载下砂岩力学特性及破坏模式试验研究[J]. 振动与冲击，2012，31(8)：29–32.(GONG Fengqiang，LI Xibing，LIU Xiling. Tests for sandstone mechanical properties and failure model under triaxial SHPB loading[J]. Journal of Vibration and Shock，2012，31(8)：29–32.(in Chinese))
[14] 王文，李化敏，袁瑞甫，等. 动静组合加载含水煤样的力学特征及细观力学分析[J]. 煤炭学报，2016，41(3)：611–617.(WANG Wen，LI Huamin，YUAN Ruifu，et al. Micromechanics analysis and mechanical characteristics of water-saturated coal samples under coupled static-dynamic loads[J]. Journal of China Coal Society，2016，41(3)：611–617.(in Chinese))
[15] 杨英明，陶春梅，郭奕宏，等. 动静组合加载下煤体损伤及力学特性研究[J]. 采矿与安全工程学报，2019，36(1)：198–206.(YANG Yingming，TAO Chunmei，GUO Yihong，et al. Analysis on damage and mechanical properties of coal under coupled static-dynamic loading[J]. Journal of Mining and Safety Engineering，2019，36(1)：198–206.(in Chinese))
[16] 方兆惠，平琦，张号. 一维动静组合加载下石灰岩力学特性试验研究[J]. 安徽理工大学学报：自然科学版，2018，38(6)：36–41. (FANG Zhaohui，PING Qi，ZHANG Hao. Experimental study on mechanical properties of limestone under combined one-dimensional static and dynamic loading[J]. Journal of Anhui University of Science and Technology：Natural Science，2018，38(6)：36–41.(in Chinese))
[17] 唐礼忠，王春，程露萍，等. 一维静载及循环冲击共同作用下矽卡岩力学特性试验研究[J]. 中南大学学报：自然科学版，2015，46(10)：3 898–3 906.(TANG Lizhong，WANG Chun，CHENG Luping，et al. Experimental study of mechanical characteristics of skarn under one-dimensional coupled static and cyclic impact loads[J]. Journal of Central South University：Science and Technology，2015，46(10)：3 898–3 906.(in Chinese))
[18] 牛勇，李克钢，刘德克，等. 一维应力预加载下红砂岩冲击力学特性试验研究[J]. 实验力学，2016，31(3)：409–416.(NIU Yong，LI Kegang，LIU Deke，et al. Experimental investigation on impact dynamics properties of red sand stone subjected to one-dimensional stress preloading[J]. Journal of Experimental Mechanics，2016，31(3)：409–416.(in Chinese))
[19] 刘洋，刘长武. 冲击荷载下轴压对峰后破裂砂岩力学特性的影响[J]. 煤炭学报，2018，43(5)：1 281–1 288.(LIU Yang，LIU Changwu. Effect of axial static stress on mechanical properties of post-peak cracked sandstone under impact loading[J]. Journal of China Coal Society，2018，43(5)：1 281–1 288.(in Chinese))
[20] YIN T B，SHU R H，LI X B. Combined effects of temperature and axial pressure on dynamic mechanical properties of granite[J]. Transactions of Nonferrous Metals Society of China，2016，26(8)：   2 209–2 219.
[21] 谭青，孔亨，夏毅敏，等. 不同载荷下TBM盘形滚刀破岩试验研究[J]. 铁道科学与工程学报，2018，15(11)：2 956–2 963.(TAN Qing，KONG Heng，XIA Yimin，et al. Experimental research of TBM disc cutter cutting rock on different load case[J]. Journal of Railway Science and Engineering，2018，15(11)：2 956–2 963.(in Chinese))
[22] WANG S F，SUN L C，LI X B，et al. Experimental investigation of cut ability improvement for hard rock fragmentation using conical cutter[J]. International Journal of Geomechanics，2021，21(2)：1–11.
[23] 刘书斌，倪红坚，王勇，等. 多维冲击提高PDC钻头破岩效率的机制研究[J]. 振动与冲击，2021，40(2)：258–264.(LIU Shubin，NI Hongjian，WANG Yong，et al. Mechanism of multi-dimensional impact loads applied in increasing the rock cutting efficiency of a PDC bit[J]. Journal of Vibration and Shock，2021，40(2)：258–264.(in Chinese))
[24] 刘志义，甘德清，甘泽. 微波照射后磁铁矿石动力学性能及破碎特征研究[J]. 岩石力学与工程学报，2021，40(1)：126–136.(LIU Zhiyi，GAN Deqing，GAN Ze. Experimental research on the dynamic mechanical properties and breakage behaviors of magnetite caused by microwave irradiation[J]. Chinese Journal of Rock Mechanics and Engineering，2021，40(1)：126–136.(in Chinese))
[25] 宫凤强，李夕兵，饶秋华，等. 岩石SHPB试验中确定试样尺寸的参考方法[J]. 振动与冲击，2013，32(17)：24–28.(GONG Fengqing，LI Xibing，RAO Qiuhua，et al. Reference method for determining sample size in SHPB tests of rock materials[J]. Journal of Vibration and Shock，2013，32(17)：24–28.(in Chinese))