Mechanical and Acoustic Emission (AE) Characteristics of Rocks under Biaxial Confinements

被引:24
作者
Du, Kun [1 ,2 ]
Liu, Minghui [1 ]
Yang, Chengzhi [1 ]
Tao, Ming [1 ]
Feng, Fukang [3 ]
Wang, Shaofeng [1 ]
机构
[1] Cent South Univ, Sch Resources & Safety Engn, Changsha 410083, Hunan, Peoples R China
[2] Cent South Univ, Adv Res Ctr, Changsha 410083, Hunan, Peoples R China
[3] Changchun Gold Res Inst Co Ltd, Changchun 130012, Jilin, Peoples R China
来源
APPLIED SCIENCES-BASEL | 2021年 / 11卷 / 02期
基金
中国国家自然科学基金;
关键词
biaxial compression test; biaxial compressive strength; deformation; acoustic emission; intermediate principal stress;
D O I
10.3390/app11020769
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The surrounding rocks of underground engineering are generally subjected to a biaxial compressive stress condition. The failure properties of rocks under such a stress condition are worthy of being studied to ensure the stability of surrounding rock. This study aims to investigate the mechanical characteristics and acoustic emission (AE) properties of granite, marble, and sandstone in biaxial compression tests. Under biaxial confinements, it is evident that the elastic moduli of the three types of rocks decrease, and the plasticity increases monotonously with the increase of the intermediate principal stress sigma(2). As sigma(2) increases, the biaxial compressive strength sigma(bcs) of rock increases initially and subsequently decreases. The lateral strain epsilon(2) of rock under biaxial confinement is controlled by both sigma(1) and sigma(2), and the restrain degree in the development of microcracks and the constrain extent in the expansion along the direction of sigma(2) are both enhanced gradually with increase in sigma(2). The sharp increase points of AE hit and AE count indicate that the failure will occur soon. The AF-RA distribution of AE signals shows that the increase of sigma(2) causes more tensile cracks in rock. According to the dip failure angle of macro-cracks in rock under biaxial confinement, the failure modes of granite and marble are slabbing, while failure mode of sandstone is shear. In addition, the sigma(2) has a positive effect on the mass ratio of large size fragments after rock failure. An exponent relationship between the sigma(bcs) and sigma(2) was found, and the inner apices-inscribed Drucker-Prager criterion can be used to predict the sigma(bcs) of rock.
引用
收藏
页码:1 / 20
页数:21
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