Experimental study on fracture charge scale effect of coal specimen under uniaxial compression

doi:10.16265/j.cnki.issn1003-3033.2018.04.022

Abstract

Abstract: In order to study the difference in the occurrence and development of fractures in coal samples different in size, experiments were performed. Under uniaxial compression conditions, the relationship between the size of coal and the charge signal of coal fracture was studied by charge induction technology. The results show that electric charge per unit volume is a power function of the volume under uniaxial compression and electric charge per unit area is a power function of the area under uniaxial compression, that the existence of charge scale effect of coal specimen is due to the heterogeneity of coal samples, that there is low-level preexisting fracture in large volume or area coal specimen, so the probability of the expansion of original cracks and the generation and expansion of new cracks is greater in coal samples of large volume or area, and the numerous cracks cause the generation of more electrostatic charges.

Key words: fracture of coal, scale effect, quantity of electric charge of unit volume, power function, quantity of electric charge of unit area, initial fissure

CLC Number:

X936

WANG Yalin, PAN Yishan, MA Xiao, ZHU Xiaojing, LUO Hao. Experimental study on fracture charge scale effect of coal specimen under uniaxial compression[J]. China Safety Science Journal, 2018, 28(4): 128-132.

References

[1] 潘一山, 赵扬锋,李国臻,等. 冲击地压预测的电荷感应技术及其应用[J]. 岩石力学与工程学报, 2012,31(增2): 3 988-3 993.
PAN Yishan, ZHAO Yangfeng, LI Guozhen, et al. Charge-induced technique of rock burst prediction and its application [J].Chinese Journal of Rock Mechanics and Engineering, 2012, 31(S2): 3 988-3 993.
[2] 赵扬锋, 潘一山.单轴压缩下花岗岩电磁信号的实验研究[J].中国地质灾害与防治学报, 2009,20(3): 132-137.
ZHAO Yangfeng, PAN Yishan. Study on the charge and magnetic signals of granite samples under uniaxial compression[J]. The Chinese Journal of Geological Hazard and Control, 2009,20(3): 132-137.
[3] 赵扬锋, 潘一山,李国臻,等. 岩石变形破裂过程中电荷感应信号的检测[J]. 防灾减灾工程学报, 2010,30(3): 252-255.
ZHAO Yangfeng, PAN Yishan, LI Guozhen, et al. Measuring of the charge-induced signal of rock during the deformation and fracture process [J]. Journal of Disaster Prevention and Mitigation Engineering, 2010, 30(3): 252-255.
[4] 赵扬锋, 潘一山, 刘玉春,等. 单轴压缩条件下煤样电荷感应试验研究[J]. 岩石力学与工程学报, 2011,30(2): 306-312.
ZHAO Yangfeng, PAN Yishan, LIU Yuchun, et al. Experimental study of charge induction of coal samples under uniaxial compression [J]. Chinese Journal of Rock Mechanics and Engineering, 2011, 30(2): 306-312.
[5] 潘一山, 唐治,李忠华,等. 不同加载速率下煤岩单轴压缩电荷感应规律研究[J]. 地球物理学报, 2013,56(3): 1 043-1 048.
PAN Yishan, TANG Zhi, LI Zhonghua, et al. Research on the charge inducing regularity of coal rock at different loading rate in uniaxial compression tests [J]. Chinese Journal of Geophysics, 2013, 56(3): 1 043-1 048.
[6] 潘一山, 罗浩, 唐治,等. 煤岩体拉伸失稳破坏电荷感应试验研究[J]. 岩石力学与工程学报, 2013,32(7): 1 297-1 303.
PAN Yishan, LUO Hao, TANG Zhi, et al. Study of charge induction law of coal and rock mass during tensile instability and failure [J]. Chinese Journal of Rock Mechanics and Engineering, 2013, 32 (7): 1 297-1 303.
[7] 肖晓春, 丁鑫, 潘一山,等. 颗粒煤岩破裂过程声发射与电荷感应试验[J]. 煤炭学报, 2015, 40(8): 1 796-1 804.
XIAO Xiaochun, DING Xin, PAN Yishan, et al. Experiment of acoustic emission and charge induction in granular coal rock failure [J]. Journal of China Coal Society, 2015, 40(8): 1 796-1 804.
[8] 罗浩, 潘一山, 赵扬锋,等. 含瓦斯煤体加载破坏声电前兆信息试验研究[J]. 煤炭学报, 2015, 40(3): 548-554.
LUO Hao, PAN Yishan, ZHAO Yangfeng, et al. Experimental study on acousto-charge precursory information of coal containing gas during loading failure process [J]. Journal of China Coal Society, 2015,40(3): 548-554.
[9] 唐治, 潘一山, 李国臻,等. 煤岩摩擦电荷感应规律分析[J]. 地球物理学进展, 2013,28(4): 975-979.
TANG Zhi, PAN Yishan, LI Guozhen, et al. The analysis of induced charge of electric friction in coal rock [J]. Progress in Geophysics, 2013,28(4): 975-979.
[10] 唐治, 潘一山, 李忠华,等. 煤岩破裂过程中电荷感应机理分析[J]. 岩土工程学报, 2013,30(2): 1 260-1 264.
TANG Zhi, PAN Yishan, LI Zhonghua, et al. Charge induction mechanism in the process of fracture of coal-rock [J].Chinese Journal of Geotechnical Engineering, 2013,30(2): 1 260-1 264.
[11] 王岗,潘一山,肖晓春,等. 煤体冲击倾向性指标与煤体破裂电荷关系试验研究[J]. 中国安全科学学报, 2016,26(10): 139-143.
WANG Gang, PAN Yishan, XIAO Xiaochun, et al. Experimental study on relationship between coal bodies burst tendency index and charge of coal bodies fracture [J].China Safety Science Journal, 2016,26(10): 139-143.
[12] 王岗,潘一山,肖晓春,等. 组合煤岩体冲击倾向性及破坏特征的电荷规律试验研究[J]. 中国安全科学学报, 2016,26(7): 135-140.
WANG Gang, PAN Yishan, XIAO Xiaochun, et al. Experimental study on charge law of coal-rock bodies burst tendency and failure characteristics[J]. China Safety Science Journal, 2016, 26(7): 135-140.
[13] 王剑波,朱珍德,刘金辉. 单轴压缩下煤岩尺寸效应的试验及理论研究 [J]. 水电能源科学, 2013, 31(1): 50-52.
WANG Jianbo, ZHU Zhende, LIU Jinhui. Experimental and theoretical study on size effect of coal under uniaxial compression [J]. Water Resources and Power, 2013, 31(1): 50-52.
[14] 张后全,徐建峰,贺永年,等. 灰岩单轴压缩实验室尺度效应研究 [J]. 岩石力学与工程学报, 2013, 31(2): 3 491-3 496.
ZHANG Houquan, XU Jianfeng, HE Yongnian, et al.Study of laboratory scale effect of limestone under uniaxial compression [J].Chinese Journal of Rock Mechanics and Engineering, 2013, 31(2): 3 491-3 496.

[1]	HE Wen, LU Bokai, SHI Wenfang, ZHU Siyu, LIU Jinpeng. Enhanced permeation effect of fine-grained tailings by ultrasound cavitation [J]. China Safety Science Journal, 2024, 34(5): 91-100.
[2]	XU Na, LIANG Yanxiang, WANG Liang, ZHAO Lili, ZHOU Xueqing, ZHANG Bo. Research on knowledge management in coal mine construction safety field based on knowledge graph [J]. China Safety Science Journal, 2024, 34(5): 28-35.
[3]	YANG Keming, LI Tingting, MA Jun, LI Yaxing, JIANG Kegui, ZHAO Xiangtong. Monitoring of settlement in mining industrial square based on optimal PS point acquisition method [J]. China Safety Science Journal, 2024, 34(5): 44-51.
[4]	PEI Xiaodong, YAO Zhiyuan, WANG Liang, SHAO Hao, WANG Kai, WU Zhengyan. Virtual simulation experimental system for mine fire monitoring and prevention based on Unity3D [J]. China Safety Science Journal, 2024, 34(3): 109-116.
[5]	XU Yongliang, SUN Meng, WANG Lanyun, WANG Yungang. Review of fire smoke flow characteristics and early warning prevention and control of mine belt conveyor [J]. China Safety Science Journal, 2024, 34(3): 117-128.
[6]	LI Min, LUO Ouwen, LU Yi, SHI Shiliang, LI He, LIN Zhijun. Research on spatial distribution pattern of coal spontaneous combustion hazardous zone under condition of regenerated roof [J]. China Safety Science Journal, 2024, 34(3): 129-136.
[7]	WU Fanghua, SHI Shiliang, LU Yi, GU Wangxin, TAN Jiale, LIU Weiting. Fire prevention and extinguishing performance of phosphogypsum based self-produced gas expansion slurry [J]. China Safety Science Journal, 2024, 34(3): 148-154.
[8]	DU Dongdong, LEI Wenjie, LI Donghui, LI Zhe. Study on deviation characteristic of gas extraction borehole drilling in underground coal mine [J]. China Safety Science Journal, 2024, 34(3): 155-161.
[9]	LI Yi, LU Wei, LI Jinliang, CHEN Yunlong, ZHAO Shujie. Study on influencing factors and dust suppression effect of coal seam injection gum-forming dust suppressant [J]. China Safety Science Journal, 2024, 34(3): 171-178.
[10]	YU Haimiao, XU Zepeng, ZHANG Shuo, QI Hui. Knowledge graph analysis of research progress in occupational health of coal miners [J]. China Safety Science Journal, 2024, 34(3): 230-236.
[11]	ZUO Mingcheng, JIAO Wenhua. Helmet-wearing recognition algorithm for coal mine underground operation scenarios [J]. China Safety Science Journal, 2024, 34(3): 237-246.
[12]	ZHANG Zunguo, YUAN Xinli, CHEN Yi, TANG Chao, MA Kaixin, CHEN Yongqiang. Energy evolution characteristics of sandstone under different stress cycle paths [J]. China Safety Science Journal, 2024, 34(2): 144-152.
[13]	YOU Bo, CUI Daxiong, LIU Heqing, LU Yi, YANG Xinyu. Simulation study on heat insulation and cooling of deep shaft tunnel with different heat insulation materials [J]. China Safety Science Journal, 2024, 34(2): 153-160.
[14]	WANG Yongjun, ZHENG Qian, ZHANG Hemeng, DONG Wei, ZHANG Xiaoming, SASAKI Kyuro. Correlation analysis between combustion of underground residual coal and surface carbon flux in goaf [J]. China Safety Science Journal, 2024, 34(2): 161-167.
[15]	GUO Xin, LU Yi, SHI Shiliang, LI He, LI Dafang. Mechanical properties and hydration mechanism of high-flow sealing hole grouting material [J]. China Safety Science Journal, 2024, 34(2): 168-175.