期刊
GEOMECHANICS AND ENGINEERING
卷 11, 期 3, 页码 345-359出版社
TECHNO-PRESS
DOI: 10.12989/gae.2016.11.3.345
关键词
particle flow; combined coal-rock; interfacial angle; failure pattern; mechanical properties
资金
- Natural Science Foundation of China [51474136]
- Open Research Program of Key Laboratory of Safety and High-efficiency Coal Mining, Ministry of Education (Anhui University of Science and Technology) [JYBSYS2014202, JYBSYS2014203]
- Foundation for the Author of National Excellent Doctoral Dissertation of P.R. China [201167]
In order to investigate the influence of the interfacial angel on failure characteristics and mechanism of combined coal-rock mass, 35 uniaxial/biaxial compressive simulation tests with 5 different interfacial angels of combined coal-rock samples were conducted by PFC2D software. The following conclusions are drawn: (1) The compressive strength and cohesion decrease with the increase of interfacial angle, which is defined as the angle between structure plane and the exterior normal of maximum principal plane, while the changes of elastic modulus and internal friction angle are not obvious; (2) The impact energy index K-E decreases with the increase of interfacial angle, and the slip failure of the interface can be predicted based on whether the number of acoustic emission (AE) hits has multiple peaks or not; (3) There are four typical failure patterns for combined coal-rock samples including I (V-shaped shear failure of coal), II (single-fracture shear failure of coal), III (shear failure of rock and coal), and IV (slip rupture of interface); and (4) A positive correlation between interfacial angle and interface effect is shown obviously, and the interfacial angle can be divided into weak-influencing scope (0-15 degrees), moderate-influencing scope (15-45 degrees), and strong-influencing scope (> 45 degrees), respectively. However, the confining pressure has a certain constraint effect on the interface effect.
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