首页|Identifying the real fracture hidden in rock microcrack zone by acoustic emission energy

Identifying the real fracture hidden in rock microcrack zone by acoustic emission energy

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Identifying the real fracture of rock hidden in acoustic emission(AE)source clusters(AE-depicted micro-crack zone)remains challenging and crucial.Here we revealed the AE energy(representing dissipated energy)distribution rule in the rock microcrack zone and proposed an AE-energy-based method for iden-tifying the real fracture.(1)A set of fracture experiments were performed on granite using wedge-loading,and the fracture process was detected and recorded by AE.The microcrack zone associated with the energy dissipation was characterized by AE sources and energy distribution,utilizing our self-developed AE analysis program(RockAE).(2)The accumulated AE energy,an index representing energy dissipation,across the AE-depicted microcrack zone followed the normal distribution model(the mean and variance relate to the real fracture path and the microcrack zone width).This result implies that the nucleation and coalescence of massive cracks(i.e.,real fracture generation process)are supposed to follow a normal distribution.(3)Then,we obtained the real fracture extension path by joining the peak positions of the AE energy normal distribution curve at different cross-sections of the microcrack zone.Consequently,we distinguished between the microcrack zone and the concealed real fracture within it.The deviation was validated as slight as 1-3 mm.

GeoEnergy exploitationRock fractureFracture identificationAcoustic emissionAE energy analysis

Yuekun Xing、Bingxiang Huang、Guangqing Zhang、Binghong Li、Hang Xu、Xuejie Jiao、Yang Yu、Taisen Han、Jinlong Chen

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State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources,China University of Mining and Technology,Xuzhou 221116,China

State Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum-Beijing,Beijing 102249,China

National Natural Science Foundation of ChinaFundamental Research Funds for the Central UniversitiesNational Key Research and Development Program of ChinaIndependent Research Project of State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources,CUMT

No.52274013No.2024ZDPYYQ1005No.2021YFC2902103No.SKLCRSM23X002

2024

矿业科学技术学报(英文版)
中国矿业大学

矿业科学技术学报(英文版)

CSTPCDEI
影响因子:1.222
ISSN:2095-2686
年,卷(期):2024.34(6)
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