Defining Stress Thresholds of Rock Failure Process Based on Acoustic Emission Activity Parameters

doi:10.12068/j.issn.1005-3026.2017.02.024

Abstract

Abstract: The uniaxial compression experiments were carried out on 25 granite samples by application of acoustic emission testing system in the laboratory. Through continuous real-time monitoring these characteristics of the acoustic emission sources such as event rate， cumulative energy， energy rate， time duration and amplitude in the failure process of granite rock samples， the stress thresholds at each loading stage were obtained in the whole failure process. Furthermore， by comparing the stress threshold at each stage with peak strength during the process of rock fracturing and with previous experimental results， we find that rock deformation characteristics are consistent with the evolution of the crack in rock.

Key words: acoustic emission, rock fracture, uniaxial compression, stress threshold

CLC Number:

TU45

ZHAO Xing-dong， XU Ji-tao， JI Xiang， LIU Jian-po. Defining Stress Thresholds of Rock Failure Process Based on Acoustic Emission Activity Parameters[J]. Journal of Northeastern University Natural Science, 2017, 38(2): 270-274.

References

[1]张渊，张贤，赵阳升.砂岩的热破裂过程［J］.地球物理学报，2005，48(3):656-659.(Zhang Yuan，Zhang Xian，Zhao Yang-sheng.Process of sandstone thermal cracking［J］.Chinese Journal of Geophysics，2005，48(3):656-659.)
[2]朱红光，谢和平，易成，等.岩石材料微裂隙演化的CT识别［J］.岩石力学与工程学报，2011，30(6):1230-1238.(Zhu Hong-guang，Xie He-ping，Yi Cheng，et al.CT identification of microcracks evolution for rock materials［J］.Chinese Journal of Rock Mechanics and Engineering，2011，30(6):1230-1238.)
[3]刘善军，吴立新，王川婴，等.遥感岩石力学(VIII)——论岩石破裂的热红外前兆［J］.岩石力学与工程学报，2004，23(10):1621-1627. (Liu Shan-jun，Wu Li-xin，Wang Chuan-ying，et al.Remote sensing-rock mechanics(VIII)—TIR omens of rock fracturing ［J］ Chinese Journal of Rock Mechanics and Engineering，2004，23(10):1621-1627.)
[4]Bieniawski Z T.Mechanism of brittle rock fracture.part I—theory of the fracture process［J］.International Journal of Rock Mechanics and Mining Sciences & Geomechanical Abstracts，1967a，4(4):395-406.
[5]Brace W F.Mechanism of brittle fracture of rocks［C］// State of Stress in the Earth′s Crust:Proceedings of the International Conference.New York:American Elsevier Publishing Company，1964:110-178.
[6]Martin C D.The strength of massive Lac du Bonnet granite around underground openings［D］.Winnipeg，Manitoba:University of Manitoba，1993.
[7]Diederichs M S，Kaiser P K，Eberhardt E.Damage initiation and propagation in hard rock during tunnelling and the influence of near-face stress rotation ［J］.International Journal of Rock Mechanics and Mining Sciences，2004，41(5):785-812.
[8]Eberhardt E，Stead D，Stimpson B，et al.Identifying crack initiation and propagation thresholds in brittle rock［J］.Canadian Geotechnical Journal，1998，35(2):222-233.
[9]Chang S H，Lee C I.Estimation of cracking and damage mechanisms in rock under triaxial compression by moment tensor analysis of acoustic emission ［J］.International Journal of Rock Mechanics & Mining Sciences，2004，41:1069-1086.
[10]Griffith A.The phenomena of rupture and flow in solids［J］.Philosophical Transactions of the Royal Society of London:A，1921，221:163-198.
[11]Bieniawski Z T.Mechanism of brittle rock fracture.part II—experimental studies［J］.International Journal of Rock Mechanics and Mining Sciences & Geomechanical Abstracts，1967b，4(4):407-423.
[12]张志镇.岩石变形破裂过程中的能量演化机制［D］.徐州:中国矿业大学，2013. (Zhang Zhi-zhen.Energy evolution mechanism during rock deformation and failure ［D］.Xuzhou:China University of Mining Technology，2013.)
[13]Eberhardt E.Brittle rock fracture and progressive damage in uniaxial compression［D］.Saskatoon: University of Saskatchewan，1998.
[14]Nickslar M，Martin C D.Evaluation of methods for determining crack initiation in compression tests on low-porosity rocks［J］.Rock Mechanics and Rock Engineering，2012，45(4): 607-617.
[15]周辉，孟凡震，卢景景，等.硬岩裂纹起裂强度和损伤强度取值方法探讨［J］.岩土力学，2014，35(4):913-918.(Zhou Hui，Meng Fan-zhen，Lu Jing-jing，et al.Discussion on methods for calculating crack initiation strength and crack damage strength for hard rock ［J］.Chinese Rock and Soil Mechanics，2014，35(4):913-918.)
[16]彭俊，蔡明，荣冠，等.裂纹闭合应力及其用于评价岩石微裂纹损伤［J］.岩石力学与工程学报，2015，34(1):1-10.(Peng Jun，Cai Ming，Rong Guan，et al.Crack closure stress and its use for assessing stress-induced microcrack damage ［J］.Chinese Journal of Rock Mechanics and Engineering，2015，34(1):1-10.)