矿渣类颗粒介质结构对力链发展规律的影响  

Granule structure influences on force chain development in the slag medium

作　　者：陆敏凤 唐朝晖[1] 柴波[2] 宁可 祝洁雯 方熠 Lu Minfeng;Tang Zhaohui;Chai Bo;Ning Ke;Zhu Jiewen;Fang Yi(School of Engineering,China University of Geosciences(Wuhan),Wuhan 430074,China;School of Environmental Studies,China University of Geosciences(Wuhan),Wuhan 430074,China;Zhongjiao Second Highway Survey and Design Research Institute Co.,Ltd.,Wuhan 430074,China)

机构地区：[1]中国地质大学(武汉)工程学院,武汉430074 [2]中国地质大学(武汉)环境学院,武汉430074 [3]中交第二公路勘察设计研究院有限公司,武汉430074

出　　处：《地质科技通报》2022年第4期274-281,共8页Bulletin of Geological Science and Technology

基　　金：国家自然科学基金项目(41877253)。

摘　　要：矿业活动产生的渣体是不规则颗粒介质,具有级配复杂、结构不稳定的特征,颗粒间通过力链传递应力。以典型铜矿渣为研究对象,借助CT扫描技术获得矿渣的颗粒结构形态,通过开展不同粗颗粒含量的平面压缩试验和数值模拟试验,得到宏观力学变形曲线及力链发展过程和颗粒结构变化,讨论颗粒结构和力链发展协同作用对宏观力学性质的影响机制,以及颗粒介质材料压缩发展规律。结果表明:矿渣类颗粒介质材料的力链发展方向与压力方向一致;矿渣宏观抗压性能随>5 mm粗颗粒含量的增加先增后减,在最优粗细颗粒配比50%处达到最大抗压强度;颗粒结构和力链间软硬结构存在显著的协同演化;压缩过程中内部存在快速压密、颗粒破碎和稳定压缩3个阶段。在矿渣堆填过程中,除控制其粗颗粒在最优级配外,保持均匀填筑和合理的压实使其进入稳定压缩阶段也非常重要。The slag dumps formed by mining activities are irregular granular media.Their particle size gradations are complex and granule structures are unstable.The stress between particles is transferred through the dependently unstable force chain.Taking the typical copper slag as the study object,its granule structure was investigated using CT scanning technology.According to plane compression and corresponding numerical simulation tests on coarse particles of different mass fraction contents,stress-straincurves,force chain evolutions and granule structure changes were obtained.Further,the synergistic effect between granule structure and force chain evolutionon macro-mechanics was discussed.Meanwhile,the compression law of granular material was revealed.The results show that the direction of force chain evolution direction inslag granular materialis consistent with the direction of pressure.The macro-compressive strength of slag increases first and then decreases with increasing coarse particle(>5 mm)mass fraction content and reaches the maximum compressive strength at the optimal coarse particle ratio of 50%.The granule structure and the soft-hard structure inforce chains have a significant synergistic effect.The granule structure change in slag granular material will experience three stages during compression process:the rapid compaction stage,particle crushing stage and stable compression stage.In the process of slag landfill,it is important to keep uniform filling and reasonable compaction to make it enter the stable compression stage,as well as controlling the optimal grading of coarse particles.

关 键 词：矿渣 颗粒介质 颗粒结构 力链 平板压缩试验 

分 类 号：P642.2[天文地球—工程地质学]