Acoustic Emission Source Location Monitoring of Laboratory-Scale Hydraulic Fracturing of Coal Under True Triaxial Stress

2021 ◽  
Author(s):  
Nan Li ◽  
Weichen Sun ◽  
Bingxiang Huang ◽  
Dong Chen ◽  
Shaohua Zhang ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Hydraulic Fracturing ◽  
Source Location ◽  
Laboratory Scale ◽  
Triaxial Stress ◽  
Emission Source ◽  
True Triaxial ◽  
Acoustic Emission Source ◽  
True Triaxial Stress

scholarly journals Characteristics of Acoustic Emission Waveforms Induced by Hydraulic Fracturing of Coal under True Triaxial Stress in a Laboratory-Scale Experiment

Minerals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 104
Author(s):  
Nan Li ◽  
Liulin Fang ◽  
Bingxiang Huang ◽  
Peng Chen ◽  
Chao Cai ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Hydraulic Fracturing ◽  
Coal Sample ◽  
Injection Pressure ◽  
Triaxial Stress ◽  
Pressure Curve ◽  
Secondary Fracture ◽  
True Triaxial ◽  
True Triaxial Stress ◽  
Study Laboratory

Hydraulic fracturing (HF) is an effective technology to prevent and control coal dynamic disaster. The process of coal hydraulic fracturing (HF) induces a large number of microseismic/acoustic emission (MS/AE) waveforms. Understanding the characteristic of AE waveforms’ parameters is essential for evaluating the fracturing effect and optimizing the HF strategy in coal formation. In this study, laboratory hydraulic fracturing under true triaxial stress was performed on a cubic coal sample combined with AE monitoring. The injection pressure curve and temporal variation of AE waveforms’ parameters in different stages were analyzed in detail. The experimental results show that the characteristics of the AE waveforms’ parameters well reflect the HF growth behavior in coal. The majority of AE waveforms’ dominant frequency is distributed between 145 and 160 kHz during HF. The sharp decrease of the injection pressure curve and the sharp increase of the AE waveforms’ amplitude show that the fracture already runs through the coal sample during the initial fracture stage. The “trapezoidal” rise pattern of cumulative energy and most AE waveforms with low amplitude may indicate the stage of liquid storage space expansion. The largest proportion of AE waveforms’ energy and higher overall level of AE waveforms’ amplitude occur during the secondary fracture stage, which indicates the most severe degree of coal fracture and complex activity of internal fracture. The phenomenon shows the difference in fracture mechanism between the initial and secondary fracture stage. We propose a window-number index of AE waveforms for better response to hydraulic fracture, which can improve the accuracy of the HF process division.

Acoustic emission source location in composite structure by Voronoi construction using geodesic curve evolution

2009 ◽  
Vol 126 (5) ◽  
pp. 2324-2330 ◽  
Author(s):  
R. Gangadharan ◽  
G. Prasanna ◽  
M. R. Bhat ◽  
C. R. L. Murthy ◽  
S. Gopalakrishnan
Keyword(s):  
Acoustic Emission ◽  
Composite Structure ◽  
Source Location ◽  
Emission Source ◽  
Curve Evolution ◽  
Geodesic Curve ◽  
Acoustic Emission Source

Acoustic emission source location considering refraction in layered media with cylindrical surface

2020 ◽  
Vol 30 (3) ◽  
pp. 789-799 ◽  
Author(s):  
Zi-long ZHOU ◽  
Jing ZHOU ◽  
Xin CAI ◽  
Yi-chao RUI ◽  
Lian-jun CHEN ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Cylindrical Surface ◽  
Layered Media ◽  
Source Location ◽  
Emission Source ◽  
Acoustic Emission Source

A new acoustic emission source location technique based on wavelet transform and mode analysis

2006 ◽  
Vol 1 (3) ◽  
pp. 341-345 ◽  
Author(s):  
Jing-pin Jiao ◽  
Cun-fu He ◽  
Bin Wu ◽  
Ren-yuan Fei ◽  
Xiu-yan Wang
Keyword(s):  
Acoustic Emission ◽  
Wavelet Transform ◽  
Source Location ◽  
Emission Source ◽  
Mode Analysis ◽  
Acoustic Emission Source

Research on Acoustic Emission Source Location Imaging in Aluminum Alloy Plate-type Structure

2019 ◽  
Vol 48 (4) ◽  
pp. 20180831
Author(s):  
Shaofeng Wang ◽  
Daorui Wang ◽  
Jianguo Wang ◽  
Hailing Wang ◽  
Guang Xu ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Aluminum Alloy ◽  
Source Location ◽  
Type Structure ◽  
Emission Source ◽  
Alloy Plate ◽  
Acoustic Emission Source ◽  
Aluminum Alloy Plate ◽  
Plate Type
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