Mechanical properties of granite under quasi-static compression combined shear loading

被引：0
|
作者：
He Q. [1 ,2 ]
Li Y. [3 ]
Zhou B. [1 ]
Wu B. [1 ,4 ]
Zhang X. [2 ]
Zhang S. [2 ]
机构：
[1] State Key Laboratory of Water Resource Protection and Utilization in Coal Mining, Beijing
[2] School of Mines, China University of Mining & Technology, 221116, Jiangsu
[3] State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, 116024, Liaoning
[4] School of Mechanics and Civil Engineering, China University of Mining& Technology-Beijing, Beijing
来源：
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | 2020年 / 37卷 / 03期
关键词：
Acoustic emission; Compression combined shear loading; Microcrack damage threshold; Microcrack initiation threshold; Pillar stability;
D O I：
10.13545/j.cnki.jmse.2020.03.018
中图分类号：
TB5 [声学工程];
学科分类号：
0702 ; 070206 ;
摘要：
Underthe condition of mildly inclined or inclined orebody, the pillars are usually subject to compression combined shear loading. A novel rock mechanical property test system has been used in this paper, combined with the acoustic emission technology, to obtain the mechanical behavior change of granite sample under quasi-static compression combined shear loading conditions. Both the microcrack initiation thresholdand microcrack damage thresholdof granite sample are linearly decreased with the increase of the angle of the sample. The ratio of microcrack initiation stress to peak intensity is basically unchanged in the range of 0° to 10° inclination angle. The ratio of microcrack damage stress to peak intensity gradually decreases when the pattern inclination angle increases to 10°. Compared with the uniaxial compression state, the peak intensity of the granite pattern decreased by 13.7% and 29.8% when the sample inclination angles were 5° and 10°, respectively. The failure mode of the sample gradually changed from axially separated fracture to shear failure. It is recommended to add a new parameter of rock strength under compression and shear to the empirical formula of strength of the pillar taking the influence of the pillar inclination angle on pillar strength into consideration. © 2020, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.
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收藏
页码：586 / 593
页数：7
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