Experimental study on acoustic and mechanical properties of intermittent jointed rock mass

被引：0
|
作者：
Zhao X. [1 ]
Zhao X. [1 ]
Guo J. [2 ]
机构：
[1] Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, 611756, Sichuan
[2] School of Civil Engineering, Henan Polytechnic University, Jiaozuo, 454003, Henan
来源：
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2020年 / 39卷 / 07期
基金：
中国国家自然科学基金;
关键词：
Acoustic wave velocity; Intermittent jointed rock mass; Rock mechanics; Uniaxial compression strength(UCS);
D O I：
10.13722/j.cnki.jrme.2020.0008
中图分类号：
学科分类号：
摘要：
The influence of intermittent joints on the strength of rock masses and its evaluation method have always been one of the hotspots and difficulties in the field of rock mass mechanics. In this paper, 45 samples of intermittent jointed rock mass are made from gypsum with different combinations of joint inclination, density connectivity, and ultrasonic wave speed and uniaxial compression strength(UCS) tests are performed. The correlation characteristics between the mechanical and acoustic parameters are investigated, the influence of the distribution characteristics of joints on the rock mass failure mode and UCS is explored and consequently a determination method of the UCS of intermittent jointed rock mass is proposed. The results show that the P-wave velocity is positively correlated with the joint connectivity and has an approximately V-shaped change with increasing the joint dip angle, and that both the UCS and the elastic modulus(E) of the jointed rock mass increase with increasing the joint connectivity and the UCS presents an approximately U-shaped change with increasing the joint dip angle. Four fracturing modes of intermittent jointed rock masses are proposed and it is pointed out that samples are most prone to fail when the joint forms a 45°angle with the loading direction. Finally, a fitting relationship between the UCS of jointed rock masses and intact rock block is proposed by considering not only the P-wave velocity but also the internal friction angle of the rock block and the joint dip angle. © 2020, Science Press. All right reserved.
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页码：1408 / 1419
页数：11
相关论文
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