煤体结构对压缩强度影响的颗粒流模拟  

Particle Flow Simulation of Influence of Coal Structure on Compressive Strength

作　　者：鲁海峰[1] 李慧颖 李璐 LU Haifeng;LI Huiying;LI Lu(School of Earth and Environment,Anhui University of Science and Technology,Huainan Anhui 232001,China)

机构地区：[1]安徽理工大学地球与环境学院,安徽淮南232001

出　　处：《安徽理工大学学报（自然科学版）》2022年第6期52-60,共9页Journal of Anhui University of Science and Technology:Natural Science

基　　金：国家自然科学基金资助项目(41977253);中国矿业大学煤炭资源与安全开采国家重点实验室开放基金资助项目(SKLCRSM20KFA06)。

摘　　要：煤体结构是影响煤强度的重要因素,对煤与瓦斯突出具有重要的控制作用。运用二维颗粒流程序PFC^(2D)分别建立了软煤、硬煤、软硬组合煤以及含夹矸煤的单轴压缩试验模型,模拟分析煤体软硬特性、软硬不同角度组合、不同夹矸厚度以及不同夹矸位置对压缩强度的影响规律,并将模拟结果与室内试验进行对比验证。研究结果表明,均质软煤压缩强度较低,均质硬煤较高,大致是软煤的3倍;不同角度组合体的压缩强度较均质煤体在角度低于75°时均有所降低;夹矸的存在增大了煤岩体的塑性特性,且当夹矸位置处于煤体中心时,压缩强度最大。研究成果对正确认识煤体结构对压缩强度的影响机理提供重要理论支撑。Coal structure is an important factor affecting coal strength and plays an important role in controlling coal and gas outburst.The uniaxial compression test models of soft coal,hard coal,soft-hard combined coal and gangue coal were established by using two-dimensional particle flow program PFC^(2D).The effects of soft and hard characteristics of coal,different angles of soft and hard combination,different gangue thickness and different gangue position on compressive strength were simulated and analyzed,and the simulation results were compared with laboratory tests.The results show that the compressive strength of homogeneous soft coal is low and that of homogeneous hard coal is high about three times that of soft coal.The compressive strength of different angle combinations is lower than that of homogeneous coal when the angle is lower than 75°.The existence of parting increases the plastic characteristics of coal and rock,and when the parting is in the center of coal,the compressive strength is the largest.The research results provide important theoretical support for correctly understanding the influence mechanism of coal structure on compressive strength.

关 键 词：PFC^(2D) 压缩强度 均质煤体 含夹矸煤体 

分 类 号：TD32[矿业工程—矿井建设]