Mechanical and crack evolution characteristics of coal-rock under different fracture-hole conditions: a numerical study based on particle flow code
Mechanical and crack evolution characteristics of coal-rock under different fracture-hole conditions: a numerical study based on particle flow code
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DOI：
10.1007/s12665-018-7486-3
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发表时间：
2018-04-01
影响因子：
2.8
通讯作者：
Tian, Long-gang
中科院分区：
文献类型：
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作者：
Wang, Xiao;Tian, Long-gang
煤岩材料中含有大量的裂隙和孔洞，研究其力学特性对认识煤体失稳机理具有重要意义。考虑不同倾角的裂隙和不同位置的孔洞，利用PFC 2D软件建立了多种缺陷煤岩试件，探讨了不同孔洞条件下煤岩的应力应变特征和裂纹演化规律。结果表明：不同裂隙开孔的煤岩试件的力学性能、裂纹演化特征、初始裂纹扩展形式和最终裂纹分布形式均不同;裂隙开孔角度的影响大于开孔位置的影响。随着断裂角的增大，峰值强度、峰值应变、峰值阶跃和裂纹总数均呈增大趋势，而裂纹初扩展长度则越来越短。
Coal-rock material contains many fractures and holes and it is of great significance to study their mechanical characteristics for understanding the instability mechanism of coal body. In this manuscript, considering fracture with different inclinations and hole with different positions, a variety of defective coal-rock specimens were established by PFC2D software, then characteristics of stress-strain and crack evolution law of coal-rock with different fracture-holes were discussed. The results show that mechanical properties, crack evolution characteristics, propagation forms of initial crack and final crack distribution form of coal-rock specimens with different fracture holes are different; the fracture angle has a larger influence than the hole position. Peak strength, peak strain, peak step and the total crack number show an increasing trend with the increase of fracture angle, while the crack initial propagation length becomes shorter and shorter.