共 42 条
Acoustic emission signal characteristics and its critical slowing down phenomenon during the loading process of water-bearing sandstone
被引:36
作者:

Li, Hongru
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机构:
Tongji Univ, Coll Civil Engn, Dept Geotech Engn, Shanghai 200092, Peoples R China
Tongji Univ, Key Lab Geotech & Underground Engn, Minist Educ, Shanghai 200092, Peoples R China Tongji Univ, Coll Civil Engn, Dept Geotech Engn, Shanghai 200092, Peoples R China

Shen, Rongxi
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机构:
China Univ Min & Technol, Sch Safety Engn, Xuzhou 221116, Jiangsu, Peoples R China Tongji Univ, Coll Civil Engn, Dept Geotech Engn, Shanghai 200092, Peoples R China

Qiao, Yafei
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机构:
Tongji Univ, Coll Civil Engn, Dept Geotech Engn, Shanghai 200092, Peoples R China
Tongji Univ, Key Lab Geotech & Underground Engn, Minist Educ, Shanghai 200092, Peoples R China Tongji Univ, Coll Civil Engn, Dept Geotech Engn, Shanghai 200092, Peoples R China

He, Manchao
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h-index: 0
机构:
Tongji Univ, Coll Civil Engn, Dept Geotech Engn, Shanghai 200092, Peoples R China
China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Beijing 100083, Peoples R China Tongji Univ, Coll Civil Engn, Dept Geotech Engn, Shanghai 200092, Peoples R China
机构:
[1] Tongji Univ, Coll Civil Engn, Dept Geotech Engn, Shanghai 200092, Peoples R China
[2] Tongji Univ, Key Lab Geotech & Underground Engn, Minist Educ, Shanghai 200092, Peoples R China
[3] China Univ Min & Technol, Sch Safety Engn, Xuzhou 221116, Jiangsu, Peoples R China
[4] China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Beijing 100083, Peoples R China
基金:
中国国家自然科学基金;
关键词:
Acoustic emission;
Critical slowing down;
Water-bearing sandstone;
Failure precursor;
FRACTAL CHARACTERISTICS;
MECHANICAL-PROPERTIES;
COAL;
EVOLUTION;
CONCRETE;
BEHAVIOR;
ENERGY;
D O I:
10.1016/j.jappgeo.2021.104458
中图分类号:
P [天文学、地球科学];
学科分类号:
07 ;
摘要:
In deep underground engineering, the rock mass is often in a water-bearing state. Understanding the acoustic emission (AE) signal characteristics of water-bearing rock during loading process plays a crucial role in the monitoring and prediction of dynamic disasters in deep underground engineering. Therefore, sandstone samples with varying water contents were subjected to a series of uniaxial compression experiments, and AE signals were simultaneously collected. The mechanical properties and AE signal features of water-bearing sandstone were studied, and the influence mechanism of water on AE signals was expounded. Then, with reference to the critical slowing down theory, both the autocorrelation coefficient and the variance of the AE energy sequence were calculated, and the precursor characteristics of sandstone failure with varying water contents were discussed. It was pointed out that there was a critical slowing down phenomenon in AE signal. Compared with autocorrelation coefficient, variance is more sensitive to large-scale fracture of rock and has less false signal. Therefore, the sudden increase of variance can serve as an effective precursor that indicates rock failure. Moreover, for a sandstone sample with a higher the water content, the precursor point occurs earlier and appears to be more notable.
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页数:9
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