压实过程中煤矸石颗粒流细观演化规律研究  

Study on particle flow mesoscopic evolution law of coal gangue in compaction process

作　　者：巨峰[1] 宁湃 何泽全 肖猛[1] 王广伟 JU Feng;NING Pai;HE Zequan;XIAO Meng;WANG Guangwei(State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;College of Mechanics and Civil Engineering,China University of Mining and Tech nology,Xuzhou,Jiangsu 221116,China;Shandong Xinjulong Energy Co Ltd,Heze,Shandong 274000,China)

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221116 [2]中国矿业大学力学与土木工程学院,江苏徐州221116 [3]山东新巨龙能源有限责任公司,山东菏泽274000

出　　处：《采矿与安全工程学报》2020年第1期183-191,共9页Journal of Mining & Safety Engineering

基　　金：国家重点研发计划项目(2018YFC0604706);国家自然科学基金项目(51674241)。

摘　　要：研究煤矿矸石充填材料压实变形中的细观演化规律对提升固体充填效果有重要意义。本文采用颗粒流数值软件PFC^2D,考虑压实过程中颗粒破碎,通过颗粒簇cluster单元构建煤矿矸石颗粒模型,分析在单轴侧限压缩条件下不同配比颗粒体系细观演化特征,研究颗粒力链分布、裂隙与细观特征之间的关系。结果表明:模拟模型的应力应变和破碎方式等方面与实验室试验结果有着良好的对应;分析模型颗粒内部力链分布和裂隙演化规律,发现多数力链集中在颗粒较大的颗粒单元附近,形成"骨架力链"现象,裂隙也主要产生在颗粒较大的颗粒单元周围,该现象导致大颗粒单元周围配位数个数与接触力大小较其他颗粒明显增加。It is of great significance to improve effect of solid filling by investigating the micro-evolution law of coal gangue filling materials in compaction deformation process. In this study, with taking particle breakage during compaction into account,particle flow numerical software PFC^2D was used to construct a coal gangue particle model using flexible cluster model. Micro-evolution characteristics of particle systems with different ratios under uniaxial confined compression were analyzed. Meanwhile, relationship between coordination number, contact force and micro-characteristics of particles was studied. Results show that the stress-strain and fracture mode of simulation model are in good agreement with experimental results. Distribution of force chains and cracks evolution in the model particles were analyzed. It is found that most of the force chains are concentrated near larger particle units, forming a "skeleton force chain" phenomenon. Meanwhile, cracks mainly occurred around larger particle units. This phenomenon could result in the number of coordination numbers and contact force around large particle unit being larger than those of other particles.

关 键 词：煤矿矸石 颗粒流 柔性簇 侧限压缩 细观演化 

分 类 号：TU452[建筑科学—岩土工程]