加载角度对煤声发射特征的影响试验研究

彭相愿; 高富强

加载角度对煤声发射特征的影响试验研究

计量
- 文章访问数: 14
- HTML全文浏览量: 0
- PDF下载量: 13
出版历程
- 发布日期: 2023-02-19

Acoustic emission characteristics of coal rocks under different loading angles

摘要

摘要: 为得到不同层理煤声发射参数并为其破裂机制和破裂前兆分析及判定提供参考，进行了层理角度为45°、90°、0°煤样单轴压缩声发射实验研究，分析不同加载角度煤样b值与应力及能量所对应关系，研究其声发射参数RA与AF值变化规律，并分析了加载角度为0°下的声发射b值与声发射r值。结果表明：峰值应力之后能量大量释放导致微裂纹贯通成大裂纹；加载角度为45°和90°的煤样b值相接近且明显大于0°煤样，各试件在达到峰值应力后b值均有下降趋势；加载角度为45°时，煤样破坏形式为张剪复合破坏；加载角度为90°和0°时煤样破坏形成为张拉破坏；b值大幅下降时段与r值大幅增加时段相同，r值可作为描述煤破坏程度的1个指标。
- 声发射 /
- b值 /
- 加载角度 /
- RA与AF值 /
- 破碎程度
Abstract: In order to obtain the acoustic emission parameters of different bedding coal and provide reference for the analysis and determination of its fracture mechanism and fracture precursors, the uniaxial compression acoustic emission experimental study of coal samples with bedding angles of 45°, 90° and 0° was carried out, the corresponding relationship between b values of coal samples with different loading angles and stress and energy was analyzed, the variation laws of acoustic emission parameters RA and AF values were studied, and the b value and r value under loading angle of 0 ° were analyzed. The results show that: after the peak stress, a large amount of energy is released, resulting in the penetration of micro cracks into large cracks. The b values of coal samples with loading angles of 45 ° and 90 ° are close to and significantly greater than that of 0 ° coal sample, and the b value of each specimen decreases after reaching the peak stress; when the loading angle is 45 °, the failure form of coal sample is tension shear composite failure. The loading angles of 90 ° and 0 ° are mainly tensile failure; the period of sharp decrease of b value is the same as that of sharp increase of r value, and r value can be used as an index to describe the degree of coal damage.
- acoustic emission /
- b value /
- loading angle /
- RA and AF values /
- degree of fragmentation

HTML全文

参考文献(27)

[1]	GUTENBER B, ICHTER C F. Frequency of earthquakes in California[J]. Bulletin of The Seismological Society of America, 1944, 34（4）: 185－188.
[2]	AGGELIS D G. Classification of cracking mode in concrete by acoustic emission parameters[J]. Mechanics Research Communications, 2011, 38（3）: 153-157.
[3]	AGGELIS D G, MPALASKAS A C, MATIKAS T E. Acoustic signature of different fracture modes in marble and cementitious materials under flexural load[J]. Mechanics Research Communications, 2013, 47: 39-43.
[4]	NEJATI H R, NAZERIGIVI A, SAYADI A R. Physical and mechanical phenomena associated with rock failure in Brazilian disc specimens[J]. International Journal of Environmental, Chemical, Ecological, Geological and Geophysical Engineering, 2018, 12（1）:35-39.
[5]	何满朝，赵菲，杜帅，等．不同卸载速率下岩爆破坏特征试验分析[J]．岩土力学，2014，35（10）：2737－2747. HE Manchao, ZHAO Fei, DU Shuai, et al. Rockburst characteristics based on experimental tests under different unloading rates[J]. Rock and Soil Mechanics, 2014, 35（10）: 2737-2747.
[6]	苗金丽，何满潮，李德建，等．花岗岩应变岩爆声发射特征及微观断裂机制[J]．岩石力学与工程学报，2009，28（8）：1593－1603. MIAO Jinli, HE Manchao, LI Dejian, et al. Acoustic emission characteristics of granite under strain rockburst test and its micro-fracture mechanism[J]. Chinese Journal of Rock Mechanics and Engineering, 2009, 28（8）: 1593-1603.
[7]	张黎明，马绍琼，任明远，等．不同围压下岩石破坏过程的声发射频率及b值特征[J].岩石力学与工程学报,2015，34（10）：2057-2063. ZHANG Liming, MA Shaoqiong, REN Mingyuan, et al. Acoustic emission frequency and b value characteristics in rock failure process under various confining pressures[J]. Chinese Journal of Rock Mechanics and Engineering, 2015, 34（10）: 2057-2063.
[8]	邓川．循环荷载作用下煤岩力学及声发射特征研究[J]．煤矿安全，2020，51（2）：63－69. DENG Chuan. Study on mechanical and acoustic emission characteristics of coal rock under cyclic loading[J]. Safety in Coal Mine, 2020, 51（2）: 63-69.
[9]	付斌，周宗红，王海泉，等．大理岩单轴循环加卸载破坏声发射先兆信息研究[J]．煤炭学报，2016，41（8）：1946－1953. FU Bin, ZHOU Zonghong, WANG Haiquan, et al. Precursor information study on acoustic emission characteristics of marble under uniaxial cyclic loading-unloading[J]. Journal of China Coal Society, 2016, 41（8）: 1946-1953.
[10]	李宏艳，康立军，徐子杰，等.不同冲击倾向煤体失稳破坏声发射先兆信息分析[J]．煤炭学报，2014，39（2）：384－388. LI Hongyan, KANG Lijun, XU Zijie, et al. Precursor information analysis on acoustic emission of coal with different outburst proneness[J]. Journal of China Coal Society, 2014, 39（2）: 384－388.
[11]	卢志国，鞠文君，高富强，等．结构性煤体间歇性破坏行为的实验及数值模拟研究[J]．岩石力学与工程学报，2020，39（5）：971－983. LU Zhiguo, JU Wenjun, GAO Fuqiang, et al. Experimental and numerical simulation research on intermittent failure of structural coal[J]. Chineses Journal of Rock Mechanics and Engineering, 2020, 39（5）: 971-983.
[12]	卢志国，鞠文君，王浩，等．硬煤冲击倾向各向异性特征及破坏模式试验研究[J]．岩石力学与工程学报，2019，38（4）：757－768. LU Zhiguo, JU Wenjun, WANG Hao, et al. Experimental study on anisotropic characteristics of impact tendency and failure model of hard coal[J]. Chineses Journal of Rock Mechanics and Engineering, 2019, 38（4）: 757-768.
[13]	储超群，吴顺川，张诗淮，等．层状砂岩力学行为各向异性与破裂特征[J]．中南大学学报（自然科学版），2020，51（8）：2232－2246. CHU Chaoqun, WU Shunchuan, ZHANG Shihuai, et al. Mechanical behavior anisotropy and fracture characteristics of bedded sandstone[J]. Chineses Journal of Central South University （Science and Technology）, 2020, 51（8）: 2232-2246.
[14]	张朝鹏，张茹，张泽天，等．单轴受压煤岩声发射特征的层理效应试验研究[J]．岩石力学与工程学报，2015，34（4）：770－778. ZHANG Chaopeng, ZHANG Ru, ZHANG Zetian, et al. Experimental research on effects of bedding plane on coal acoustic emission under uniaxial compression[J]. Chinese Journal of Rock Mechanics and Engineering, 2015, 34（4）: 770-778.
[15]	秦四清，李造鼎．岩石声发射事件在空间上的分形分布研究[J]．应用声学，1992（4）：19－21.
[16]	BENSON P M, VINCIGUERRA S, MEREDITH P G, et al. Laboratory simulation of volcano seismicity[J]. Science, 2008, 322（5899）: 249－252.
[17]	BURLINIL, VINCIGUERRA S, TORO G D, et al. Seismicity preceding volcanic eruptions: New experimental insights[J]. Geology, 2007, 35（2）:183－186.
[18]	VINOGRADOV S D. Acoustic observations incollieries of the kizelsk coal basin[J]. Bulletin of the Academy of Sciences of the USSR: Geophysics Series, 1957（6）: 126－131.
[19]	VINOGRADOV S D. Experimental study of the distribution of the number of fractures in respect to the energy liberated by the destruction of rocks[J]. Bulletin of the Academy of Sciences of the USSR: Geophysics Series, 1962（2）: 171.
[20]	刘希灵，潘梦成，李夕兵，等．动静加载条件下花岗岩声发射ｂ值特征的研究[J]．岩石力学与工程学报，2017，36（Ｓ1）：3148－3155. LIU Xiling, PAN Mengcheng, LI Xibing, et al. Acoustic emission b-value characteristics of granite under dynamic loading and static loading[J]. Chinese Journal of Rock Mechanics and Engineering, 2017, 36（S1）: 3148-3155.
[21]	COLOMBOIS, MAINIG, FORDEMC. Assessing damage of reinforced concrete beam using “b-value” analysis of acoustic emission signals[J]. Journal of Materials in Civil Engineering, 2003, 15（3）: 280－286.
[22]	SAGARRV, PRASAD BKR, KUMAR SS. Comparison of acoustic emission b-values with strains in reinforced concrete beams for damage evaluation[J]. Bridge Engineering, 2012, 165（BE4）: 233－244.
[23]	曾正文，马瑾，刘力强，等．岩石破裂扩展过程中的声发射ｂ值动态特征及意义[J]．地震地质，1995，17（1）：7-11. ZENG Zhengwen, MA Jin, LIU Liqiang, et al. AE b-value dynamic features during rockmass fracturing and their significances[J]. Seismology and Geology, 1995, 17（1）: 7-11.
[24]	LEI X, MA S. Laboratory acoustic emission study for earthquake generation process[J]. Earthquake Science, 2014, 27（6）: 627-646.
[25]	甘一雄，吴顺川，任义，等．基于声发射上升时间／振幅与平均频率值的花岗岩劈裂破坏评价指标研究[J]．岩土力学，2020，41（7）：2324－2332. GAN Yixiong, WU Shunchuan, REN Yi, et al. Evaluation indexes of granite splitting failure based on RA and AF of AE parameters[J]. Rock and Soil Mechanics, 2020, 41（7）: 2324-2332.
[26]	龚囱，李长洪，赵奎．红砂岩短时蠕变声发射ｂ值特征[J]．煤炭学报，2015，40（增刊1）：85－92. GONG Cong, LI Changhong, ZHAO Kui. Short-time creep acoustic emission b-value characteristics of red sandstone[J]. Journal of China Coal Society, 2015, 40（S1）: 85-92.
[27]	RAOM, LAKSHMIK. Analysis of b-value and improved b-value of acoustic emissions accompanying rock fracture[J]. Current Science, 2005, 89（9）: 1577-1582.