Broken gangue has been extensively used in rockfill dams,subgrade,embankment,foundation cushion and other engineering construction.The deformation characteristics of broken gangue under the bear-ing compression play a decisive role in the firmness,stability and safety of these structures(build-ings),and the meso-fabric change of broken gangue under the bearing compression significantly affects its macro deformation.In this study,the transparent characterization and quantitative analysis of 3D fabric of broken gangue under the bearing compression were performed through CT scanning test,image processing and 3D reconstruction technology,and the influence mechanism of internal fabric of broken gangue on its macro deformation was revealed.The results show that:In the loading stage of 0-2 MPa,the sharp corners,thin edges on the blocks and the bar-shaped and blade-shaped blocks with poor regularity are broken first under the bearing compression;in the loading stage of 2-8 MPa,a large number of larger particles in the sample are crushed in the mode of fragmentation;in the loading stage of 8-10 MPa,the breakage degree of samples is relieved.The axial displacement of the block inside the sample occurs,as well as the lateral displacement of the block converging to the central axis of the sample.In the rapid deformation stage,the macro deformation of the broken gangue is mainly caused by the rearrangement and adjustment of the block structure and the break-age of the block;in the slow deformation stage,it is mainly caused by the breakage of the block;in the stable deformation stage,it is mainly caused by the optimization and adjustment of the bearing skeleton in the sample.

Junmeng Li;Yanli Huang;Shenyang Ouyang;Yachao Guo;Huadong Gao;Laiwei Wu;Yibing Shi;Lei Zhu

State Key Laboratory of Coal Resources and Safe Mining,School of Mines,China University of Mining&Technology,Xuzhou 221116,China;Key Laboratory of Deep Coal Resource Mining of Ministry of Education,China University of Mining&Technology,Xuzhou 221116,China;College of Mining Engineering and Geology,Xinjiang Institute of Engineering,Urumqi 830000,China;CT Room,Xuzhou Central Hospital,Xuzhou 221009,China

矿业科学技术学报（英文版）

[1]Junmeng Li;Yanli Huang;Shenyang Ouyang;Yachao Guo;Huadong Gao;Laiwei Wu;Yibing Shi;Lei Zhu-.Transparent characterization and quantitative analysis of broken gangue's 3D fabric under the bearing compression)[J].矿业科学技术学报（英文版）,2022(02):335-345

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