不同含水率煤岩受压变形破坏全过程声发射特征试验研究

Abstract
Figure/Table
References
Related Citation (0)

Download: PDF (316 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract Focusing on anthracites of No.3 coal seam in Zhaozhuang Mine，Jincheng Coal Mining Group，an experimental study was carried out to investigate the acoustic emission(AE) characteristics of coal samples with different moisture contents in conventional uniaxial compression test，by using island AG–250kN rigid rock testing machine，digital strain data acquisition instrument，AE monitoring system and self-developed coal-gas coupling micromechanics experimental device. The results show that the strength and AE characteristics of coal samples with different moisture contents have significant difference；and with the increase of moisture content of coal，uniaxial compressive strength of coal sample decreases gradually. The coal sample has greater strength and larger deformation in failure process；and it is almost linear elastic deformation happens before peak，continuing for a long time. In densification region，coal samples with different moisture contents have no AE signal，but there are only a small amount of signals in coal samples in dry state，basically without change. And its average AE event rate is 4–10 times as many as coal samples with different moisture contents. In elastic stage，the AE event rates of coal samples with different moisture contents and samples in dry state are all relatively steady and similar，but the duration of AE event rate in coal samples is longer in dry state. In the plastic stage，the AE signals in the two kinds of coal samples increase evidently. Average AE of coal samples in this stage is 5–7 times as many as that in elastic stage. In the failure stage，the duration of AE event rate of coal samples with different moisture contents is lower than those in dry state. Increasing water content makes ring count reduced，and the time of obvious AE lag. Experiment results show that water has obvious effects on the mechanical properties and AE characteristics of coal samples.

Key words： mining engineering different moisture contents uniaxial experiment failure process stress-strain properties acoustic emission(AE) characteristics

Received: 20 December 2012

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors

Cite this article:

URL:

http://www.rockmech.org/EN/Y2012/V31/I6/1115

[1]	谢强，张永兴，余贤斌. 石灰岩在单轴压缩条件下的声发射特性[J]. 重庆建筑大学学报，2002，24(1)：19-22.(XIE Qiang，ZHANG Yongxing，YU Xianbin. Study on acoustic emission of limestone in uniaxial compression test[J]. Journal of Chongqing Jianzhu University，2002，24(1)：19-22.(in Chinese)) " target="_blank">
[3]	高峰，李建军，李肖音，等. 岩石声发射特征的分形分析[J]. 武汉理工大学学报，2005，27(7)：67-69.(GAO Feng，LI Jianjun，LI Xiaoyin，et al. Fractal analysis of the characteristics of acoustic emission of rock[J]. Journal of Wuhan University of Technology，2005，27(7)：67-69.(in Chinese)) " target="_blank">
[5]	王金庄，邢女仕，吴立新. 矿山开采沉陷及其损害防治[M]. 北京：煤炭工业出版社，1995：75-78.(WANG Jinzhuang，XING Nushi，WU Lixin. Mining subsidence and damage prevention[M].Beijing：China Coal Industry Press，1995：75-78.(in Chinese)) " target="_blank">
[7]	吴立新，王金庄. 煤柱宽度的计算公式及其影响因素分析[J]. 矿山测量，1997，(1)：12-16.(WU Lixin，WANG Jinzhuang. Pillar width calculation formula and analysis of influential factors[J]. Mine Survey，1997，(1)：12-48.(in Chinese)) " target="_blank">
[9]	RUDAJEV V，VILHELM J，LOKAJICEK T. Laboratory studies of acoustic emission prior to uniaxial compressive rock failure[J]. International Journal of Rock Mechanics and Mining Sciences，2000，37(4)：699-704. " target="_blank">
[11]	曹树刚，刘延保，张立强. 突出煤体变形破坏声发射特征的综合分析[J]. 岩石力学与工程学报，2007，26(增1)：2 794-2 799.(CAO Shugang，LIU Yanbao，ZHANG Liqiang. Study on characteristics of acoustic emission in outburst coal[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(Supp.1)：2 794-2 799.(in Chinese)) " target="_blank">
[12]	张茹，谢和平，刘建锋，等. 单轴多级加载岩石破坏声发射特性试验研究[J]. 岩石力学与工程学报，2006，25(12)：2 584-2 588. (ZHANG Ru，XIE Heping，LIU Jianfeng，et al. Experimental study on acoustic emission characteristics of rock failure under uniaxial multilevel loadings[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(12)：2 584-2 588.(in Chinese)) " target="_blank">
[4]	张明，李仲奎，杨强，等. 准脆性材料声发射的损伤模型及统计分析[J]. 岩石力学与工程学报，2006，25(12)：2 493-2 501. (ZHANG Ming，LI Zhongkui，YANG Qiang，et al. A damage model and statistical analysis of acoustic emission for quasi-brittle materials[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(12)：2 493-2 501.(in Chinese)) " target="_blank">
[8]	LAVROV A. The Kaiser effect in rocks：principles and stress estimation techniques[J]. International Journal of Rock Mechanics and Mining Sciences，2003，40(2)：151-171.
[16]	李尤嘉，黄醒春，邱一平，等. 含水状态下膏溶角砾岩破裂全程的细观力学试验研究[J]. 岩土力学，2009，30(5)：1 221-1 225.(LI Youjia，HUANG Xingchun，QIU Yiping，et al. Mesomechanical testing study of microfracturing process property of gypsum breccias under condition of water damage[J]. Rock and Soil Mechanics，2009，30(5)：1 221-1 225.(in Chinese)) " target="_blank">
[13]	杨永杰，陈绍杰，韩国栋. 煤样压缩破坏过程的声发射试验[J]. 煤炭学报，2006，31(5)：562-565.(YANG Yongjie，CHEN Shaojie，HAN Guodong. Experiment on acoustic emission during compression rupture procedure of coal sample[J]. Journal of China Coal Society，2006，31(5)：562-565.(in Chinese))
[15]	唐书恒，颜志丰，朱宝存，等. 饱和含水煤岩单轴压缩条件下的声发射特征[J]. 煤炭学报，2010，35(1)：37-41.(TANG Shuheng，YAN Zhifeng，ZHU Baocun，et al. Acoustic emission characteristics of water-saturated coals in uniaxial compression experiment[J]. Journal of China Coal Society，2010，35(1)：37-41.(in Chinese))
[2]	赵兴东，田军，李元辉，等. 花岗岩破裂过程中的声发射活动性研究[J]. 中国矿业，2006，15(7)：74-76.(ZHAO Xingdong，TIAN Jun，LI Yuanhui，et al. Study on the activity during the failure process of granite samples[J]. China Mining Magazine，2006，15(7)：74-76.(in Chinese)) " target="_blank">
[6]	王旭春，黄福昌，张怀新，等. A. H.威尔逊煤柱设计公式探讨与改进[J]. 煤炭学报，2002，27(6)：604-608.(WANG Xuchun HUANG Fuchang，ZHANG Huaixin，et al. Discussion and improvement for A. H. Wilson?s coal pillar design formula[J]. Journal of China Coal Society，2002，27(6)：604-608.(in Chinese)) " target="_blank">
[10]	李庶林，尹贤刚，王泳嘉，等. 单轴受压岩石破坏全过程声发射特征研究[J]. 岩石力学与工程学报，2004，23(15)：2 499-2 503. (LI Shulin，YIN Xiangang，WANG Yongjia，et al. Study on acoustic emission characteristics of uniaxial compressive rock failure[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(15)：2 499-2 503. " target="_blank">
[14]	余贤斌，谢强，李心一，等. 直接拉伸、劈裂及单轴压缩试验下岩石的声发射特性[J]. 岩石力学与工程学报，2007，26(1)：137-142.(YU Xianbin，XIE Qiang，LI Xinyi，et al. Acoustic emission of rocks under direct tension，Brazilian and uniaxial compression[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(1)：137-142.(in Chinese))