Affiliation:
1. 1 School of Safety and Emergency Management Engineering Taiyuan University of Technology Taiyuan 030024 Shanxi China tyut.edu.cn
2. 2 Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education Wuhan Institute of Technology Wuhan 430205 China wit.edu.cn
3. 3 School of Energy and Mining Engineering China University of Mining and Technology (Beijing) 100083 Beijing China cumtb.edu.cn
4. 4 College of Architecture and Transportation Liaoning Technical University Fuxin 123000 Liaoning China lntu.edu.cn
Abstract
Abstract
In order to study the bedding effect of coal and rock deformation, the surface deformation fields of coal and rock at different bedding angles were obtained by means of digital image correlation (DIC). By optimizing the statistical index describing the nonuniformity of strain field, the initiation and evolution characteristics of deformation localization were analyzed quantitatively. The concepts of equivalent cohesive force and equivalent tensile strength were put forward, and a transverse isotropic constitutive model of coal and rock was established. The results show that the maximum shear deformation field of uniaxial compressed coal and rock in parallel bedding is more likely to show the three-stage characteristics of uniform stage, localization stage, and failure stage. In the vertical and parallel bedding directions, the modified statistical index curve of coal and rock in the process of uniaxial compression shows typical two-stage characteristics. When loading perpendicular to bedding, the starting stress of deformation localization of coal and rock is closer to the peak strength, and when loading parallel to bedding, coal and rock are easier to show localization characteristics.
Funder
Department of Education of Liaoning Province
Ministry of Education of the People's Republic of China
National Natural Science Foundation of China