Study on b-value characteristics of acoustic emission of red sandstone during short-time creep process

被引：0

作者：

Gong, Cong ^{[1
,2
]}

Li, Chang-Hong ^{[1
,2
]}

Zhao, Kui ^{[3
]}

机构：

[1] Key Laboratory of the Ministry of Education of China for High-Efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing,100083, China

[2] School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing,100083, China

[3] School of Resource and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou,341000, China

来源：

Meitan Xuebao/Journal of the China Coal Society | 2015年 / 40卷

关键词：

Creep;

D O I：

10.13225/j.cnki.jccs.2014.0253

中图分类号：

学科分类号：

摘要：

The creep property is one of the most important factors that affect rock failure. Therefore, it is necessary to forecast rock creep failure. The creep tests on red sandstone were carried out using step loading and unloading method, and the characteristics of b-value acoustic emission were analyzed during the primary creep stage, the steady state creep stage, and the tertiary stage. The results show that the b-value increases in primary creep stage and steady state creep stage as the specimens are in volumetric deformation state, and keeps stable in steady state stage as the specimens are in both constant volume and dilatancy state. When the specimens step into tertiary creep stage, the b-value firstly takes on a declining trend, and then increases with time increasing, and finally declines again before the specimen failure. Therefore, the red sandstone creep failure can be forecasted by the variation characteristics of b-value to some extent. ©, 2015, China Coal Society. All right reserved.

引用

页码：85 / 92