Acoustic emission characteristics and energy mechanism in karst limestone failure under uniaxial and triaxial compression

被引：63

作者：

Wang, Qingsong ^{[1
]}

Chen, Jianxun ^{[1
]}

Guo, Jiaqi ^{[1
,2
]}

Luo, Yanbin ^{[1
]}

Wang, Hongyu ^{[1
,3
]}

Liu, Qin ^{[1
]}

机构：

[1] Changan Univ, Sch Highway, Xian 710064, Shaanxi, Peoples R China

[2] Henan Polytech Univ, Sch Civil Engn, Jiaozuo 454000, Henan, Peoples R China

[3] Shaanxi Prov Transport Planning Design & Res Inst, Xian 710068, Shaanxi, Peoples R China

来源：

BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT | 2019年 / 78卷 / 03期

基金：

中国国家自然科学基金;

关键词：

Karst limestone; Uniaxial compression; AE; Triaxial compression; Energy mechanism; CONCRETE SPECIMENS; DAMAGE; ROCKS; DEFORMATION;

D O I：

10.1007/s10064-017-1189-y

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Acoustic emission (AE) tests were performed on saturated karst limestone under uniaxial and triaxial compression. Mechanical properties, AE characteristics, and the energy mechanism of rock failure were analyzed. The peak AE activity under uniaxial compression occurred near the peak stress of the rock. Under triaxial compression, the AE activities of the rock samples first decreased then increased with increases in confining pressure. AE activity exhibited a certain lag, and the peak AE appeared when the stress had decreased significantly. Stratification of the average signal level occurred at low confining pressures. The critical confining pressure was between 15 and 20MPa, and at this pressure a dramatic change occurred in the AE characteristics of the limestone. Total strain energy, dissipated energy, and elastic strain energy at peak stress showed good exponential relationships with confining pressure and peak rock strength.

引用

页码：1427 / 1442

页数：16

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