Citation: | HE Di,KONG Xiangguo,LI Shugang,et al. Study on dynamics characteristics and energy dissipation laws of coal fracture under low−speed impact load[J]. Coal Science and Technology,2024,52(11):273−284. DOI: 10.12438/cst.2023-1341 |
To explore the dynamic characteristics and energy dissipation laws of coal fracture instability under varied impact loads, using an improved Hopkinson bar (SHPB) test system was used to conduct one-dimensional impact load, impact load and axial static load coupling dynamic tests. The dynamic characteristics of coal samples under different impact speeds and axial static loads were studied, analyzing the macroscopic fracture morphology and pore evolution of coal samples were analyzed, the mechanism of coal rock fracture instability from the perspective of energy dissipation. The research results indicate that the stress-strain curves of coal samples under different impact load disturbances all include three stages: linear elasticity, plasticity, and plastic softening. Under one-dimensional impact load, the peak strength and peak strain of coal samples exhibit significant strain rate effects. As the strain rate increases, the peak strength and peak strain of coal samples gradually increase; Screening statistics show the mass distribution of broken fragments with different particle sizes. As the strain rate increases, the mass of larger particles decreases while the mass of smaller particles increases; The incident energy, reflected energy, and dissipated energy of coal samples gradually increase with the increase of impact load, and the energy dissipation density increases exponentially; Under the coupling effect of impact load and axial static load, a low-speed impact load of 5.54 m/s is set. As the axial static load increases, the peak strength continues to increase and the peak strain linearly weakens; Based on the characterization of pore structure using nuclear magnetic resonance (NMR) experiments, the internal micropores of coal samples continuously develop with the increase of axial static load, and the expansion trend of cracks along the axial direction increases; The incident energy of coal samples remains stable with the continuous increase of axial static load, while the reflection energy decreases and the dissipation energy gradually increases. The energy dissipation density increases linearly. According to the energy dissipation mechanism of coal rock, the initiation, expansion, and penetration of pores induce the occurrence of fracture and instability in coal; In the initial stage of axial static load, more dissipated energy was used for the development of internal micropores and crack expansion. Under the instantaneous disturbance of impact loads, the formation of macroscopic fracture within the coal is induced, which ultimately results in large-scale fracture instability. Under the instantaneous disturbance of impact load, it will induce the formation of macroscopic fracture surfaces in the coal body, resulting in large-scale fracture instability.
[1] |
袁亮,王恩元,马衍坤,等. 我国煤岩动力灾害研究进展及面临的科技难题[J]. 煤炭学报,2023,48(5):1825−1845.
YUAN Liang,WANG Enyuan,MA Yankun,et al. Research progress of coal and rock dynamic disasters and scientific and technological problems in China[J]. Journal of China Coal Society,2023,48(5):1825−1845.
|
[2] |
李海涛,齐庆新,赵善坤,等. 煤矿动力灾害广义“三因素”机理探讨[J]. 煤炭科学技术,2021,49(6):42−52.
LI Haitao,QI Qingxin,ZHAO Shankun,et al. Discussion on generalized “Three Factors” mechanism of coal mine dynamic disaster[J]. Coal Science and Technology,2021,49(6):42−52.
|
[3] |
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.
|
[4] |
孔祥国,杨送瑞,王恩元,等. 冲击载荷瞬时扰动原煤试样破裂演化及瓦斯放散特征研究[J]. 岩石力学与工程学报,2023,42(6):1384−1394.
KONG Xiangguo,YANG Songrui,WANG Enyuan,et al. Fracture evolution and gas emission characteristics of raw coal samples subjected to instantaneous disturbance of impact loads[J]. Chinese Journal of Rock Mechanics and Engineering,2023,42(6):1384−1394.
|
[5] |
宫凤强,赵英杰,王云亮,等. 煤的冲击倾向性研究进展及冲击地压“人-煤-环” 三要素机理[J]. 煤炭学报,2022,47(5):1974−2010.
GONG Fengqiang,ZHAO Yingjie,WANG Yunliang,et al. Research progress of coal bursting liability indices and coal burst “Human-Coal-Environment” three elements mechanism[J]. Journal of China Coal Society,2022,47(5):1974−2010.
|
[6] |
KOLSKY H. An investigation of the mechanical properties of materials at very high rates of loading[J]. Proceedings of the Physical Society Section B,1949,62(11):676−700. doi: 10.1088/0370-1301/62/11/302
|
[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):1387−1395.
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):1387−1395.
|
[8] |
宫凤强,李夕兵,刘希灵. 一维动静组合加载下砂岩动力学特性的试验研究[J]. 岩石力学与工程学报,2010,29(10):2076−2085.
GONG Fengqiang,LI Xibing,LIU Xiling. Experimental study of dynamic characteristics of sandstone under one-dimensional coupled static and dynamic loads[J]. Chinese Journal of Rock Mechanics and Engineering,2010,29(10):2076−2085.
|
[9] |
唐礼忠,程露萍,王春,等. 高静载条件下受频繁动力扰动时蛇纹岩动力学特性研究[J]. 岩土力学,2016,37(10):2737−2745.
TANG Lizhong,CHENG Luping,WANG Chun,et al. Dynamic characteristics of serpentinite under condition of high static load and frequent dynamic disturbance[J]. Rock and Soil Mechanics,2016,37(10):2737−2745.
|
[10] |
刘少虹,毛德兵,齐庆新,等. 动静加载下组合煤岩的应力波传播机制与能量耗散[J]. 煤炭学报,2014,39(S1):15−22.
LIU Shaohong,MAO Debing,QI Qingxin,et al. Stress wave propagation mechanism and energy dissipation of combined coal and rock under static and dynamic loading[J]. Journal of China Coal Society,2014,39(S1):15−22.
|
[11] |
潘俊锋,刘少虹,杨磊,等. 动静载作用下煤的动力学特性试验研究[J]. 中国矿业大学学报,2018,47(1):206−212.
PAN Junfeng,LIU Shaohong,YANG Lei,et al. Experimental study of dynamic characteristics of coal under static and dynamic loads[J]. Journal of China University of Mining & Technology,2018,47(1):206−212.
|
[12] |
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 & Safety Engineering,2019,36(1):198−206.
|
[13] |
窦林名,白金正,李许伟,等. 基于动静载叠加原理的冲击矿压灾害防治技术研究[J]. 煤炭科学技术,2018,46(10):1−8.
DOU Linming,BAI Jinzheng,LI Xuwei,et al. Study on prevention and control technology of rockburst disaster based on theory of dynamic and static combined load[J]. Coal Science and Technology,2018,46(10):1−8.
|
[14] |
宫凤强,代金豪,王明洋,等. 高地应力“强度&应力” 耦合判据及其分级标准[J]. 工程地质学报,2022,30(6):1893−1913.
GONG Fengqiang,DAI Jinhao,WANG Mingyang,et al. “Strength & stress” coupling criterion and its grading standard for high geostress[J]. Journal of Engineering Geology,2022,30(6):1893−1913.
|
[15] |
张俊文,宋治祥,刘金亮,等. 煤矿深部开采冲击地压灾害结构调控技术架构[J]. 煤炭科学技术,2022,50(2):27−36.
ZHANG Junwen,SONG Zhixiang,LIU Jinliang,et al. Architecture of structural regulation technology for rock burst disaster in deep mining of coal mine[J]. Coal Science and Technology,2022,50(2):27−36.
|
[16] |
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):3249−3256.
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):3249−3256.
|
[17] |
邓志刚. 动静载作用下煤岩多场耦合冲击危险性动态评价技术[J]. 煤炭科学技术,2021,49(4):121−132.
DENG Zhigang. Multi-field coupling dynamic evaluation method of rockburst hazard considering dynamic and static load[J]. Coal Science and Technology,2021,49(4):121−132.
|
[18] |
赵华涛,陶明,李夕兵,等. 一维动静组合加载下圆柱孔洞花岗岩的力学性能及破裂特征[J]. 中国有色金属学报,2023,33(9):3077−3091.
ZHAO Huatao,TAO Ming,LI Xibing,et al. Mechanical properties and fracture characteristics of granite with cylindrical voids under one-dimensional dynamic static combined loading[J]. The Chinese Journal of Nonferrous Metals,2023,33(9):3077−3091.
|
[19] |
任志伟,王俊,宁建国,等. 动静组合加载下煤体力学响应及能量演化规律试验研究[J]. 矿业研究与开发,2023,43(7):108−115.
REN Zhiwei,WANG Jun,NING Jianguo,et al. Test study on mechanical response and energy evolution of coal body under dynamic and static combined loading[J]. Mining Research and Development,2023,43(7):108−115.
|
[20] |
WANG K,FENG G R,BAI J W,et al. Dynamic behaviour and failure mechanism of coal subjected to coupled water-static-dynamic loads[J]. Soil Dynamics and Earthquake Engineering,2022,153:107084. doi: 10.1016/j.soildyn.2021.107084
|
[21] |
谢和平,高峰,鞠杨. 深部岩体力学研究与探索[J]. 岩石力学与工程学报,2015,34(11):2161−2178.
XIE Heping,GAO Feng,JU Yang. Research and development of rock mechanics in deep ground engineering[J]. Chinese Journal of Rock Mechanics and Engineering,2015,34(11):2161−2178.
|
[22] |
YU X,XU L C,REGENAUER-LIEB K,et al. Modeling the effects of gas slippage,cleat network topology and scale dependence of gas transport in coal seam gas reservoirs[J]. Fuel,2020,264:116715. doi: 10.1016/j.fuel.2019.116715
|
[23] |
彭志雄,曾亚武. 基于裂纹扩展作用下的岩石损伤力学模型[J]. 东北大学学报(自然科学版),2022,43(12):1784−1791.
PENG Zhixiong,ZENG Yawu. Microcrack propagation-based damage mechanics model of rock[J]. Journal of Northeastern University (Natural Science),2022,43(12):1784−1791.
|
[24] |
谢松彬,姚艳斌,陈基瑜,等. 煤储层微小孔孔隙结构的低场核磁共振研究[J]. 煤炭学报,2015,40(S1):170−176.
XIE Songbin,YAO Yanbin,CHEN Jiyu,et al. Study on pore structure of micro-pores in coal reservoirs by low-field NMR[J]. Journal of China Coal Society,2015,40(S1):170−176.
|
[25] |
LI H,LIN B Q,CHEN Z W,et al. Evolution of coal petrophysical properties under microwave irradiation stimulation for different water saturation conditions[J]. Energy & Fuels,2017,31(9):8852−8864.
|
[26] |
郑司建. 基于低场核磁共振的煤储层特性定量分析方法[D]. 北京:中国地质大学(北京),2021.
ZHENG Sijian. Quantitative analysis method of coal reservoir characteristics based on low-field nuclear magnetic resonance[D]. Beijing:China University of Geosciences,2021.
|
[27] |
LIU K,ZHANG Q B,WU G,et al. Dynamic mechanical and fracture behaviour of sandstone under multiaxial loads using a triaxial Hopkinson bar[J]. Rock Mechanics and Rock Engineering,2019,52(7):2175−2195. doi: 10.1007/s00603-018-1691-y
|
[28] |
沈荣喜,顾周杰,王恩元,等. 真三轴条件下煤样冲击动力学及破坏特征实验研究[J]. 煤炭学报,2023,48(5):2168−2178.
SHEN Rongxi,GU Zhoujie,WANG Enyuan,et al. Experimental study on impact dynamics and failure characteristics of coal specimen under true triaxial conditions[J]. Journal of China Coal Society,2023,48(5):2168−2178.
|
[29] |
LI D Y,HAN Z Y,ZHU Q Q,et al. Stress wave propagation and dynamic behavior of red sandstone with single bonded planar joint at various angles[J]. International Journal of Rock Mechanics and Mining Sciences,2019,117:162−170. doi: 10.1016/j.ijrmms.2019.03.011
|
[30] |
KONG X G,HE D,LIU X F,et al. Strain characteristics and energy dissipation laws of gas-bearing coal during impact fracture process[J]. Energy,2022,242:123028. doi: 10.1016/j.energy.2021.123028
|
[31] |
洪亮. 冲击荷载下岩石强度及破碎能耗特征的尺寸效应研究[D]. 长沙:中南大学,2008.
HONG Liang. Study on size effect of rock strength and crushing energy consumption characteristics under impact load[D]. Changsha:Central South University,2008.
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