Analysis of characteristics of ore-rock granular shear motion based on DIC technology

被引：0
|
作者：
Jin A. [1 ,2 ]
Yao B. [1 ,2 ]
Tang K. [3 ]
Sun H. [1 ,2 ]
Zhao Y. [1 ,2 ]
机构：
[1] Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing
[2] School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing
[3] China Enfi Engineering Corporation, Beijing
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2022年 / 53卷 / 08期
基金：
中国博士后科学基金; 中国国家自然科学基金; 中央高校基本科研业务费专项资金资助;
关键词：
DIC; direct shear test; local strain; ore-rock granular; shear band;
D O I：
10.11817/j.issn.1672-7207.2022.08.025
中图分类号：
学科分类号：
摘要：
In order to explore the characteristics of the granular slope landslide and reveal the movement characteristics of the ore-rock granular under the shearing action, the direct shear test of the granular ore-rock was carried out using a self-designed visual shear model based on digital image correlation method(DIC). Under the shearing action, the particle movement on the shear plane, the evolution of local strain and the shear band were studied. The results show the following four facts. 1) The dilatancy effect occurs abruptly at 1/3 the length of the shear plane from the shear entrance, which is manifested in the positive and negative changes of the movement acceleration of the particle displacement and rotation. 2) As the shear rate increases, the local strain distribution gradually changes from a random location to the shear plane aggregation. The local strain probability density of the shear plane and the maximum shear band thickness of the upper and lower parts change with time in the form of a logistics function. 3) The local strain run across the shear plane which forms the "half-shuttle" shear band, the upper part is a circular arc surface, and the maximum thickness difference between the upper and lower parts is 2− 3 times the particle median diameter. 4) There are also mutation points of particle movement in the granular slope landslide similar to the direct shear test. Treatment at 1/3 of the shear plane length of the shear entrance can effectively prevent the slope landslide. © 2022 Central South University of Technology. All rights reserved.
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页码：3081 / 3091
页数：10
相关论文
共 39 条
  • [1] LI Jiancheng, Mining machinery: loading machinery, (1981)
  • [2] ZHENG Q J, LUO Q, YU A B., Continuum modelling of primary and secondary granular flows in a torsional shear cell [J], Powder Technology, 361, (2020)
  • [3] SUN Qicheng, WANG Guangqian, Introduction to granular material mechanics, (2009)
  • [4] LIU Dayou, Particle swarm and continuum, Multistream Academic Conference of Chinese Society of Engineering Thermophysics, pp. 1-11, (2008)
  • [5] WANG Guangjin, Study on the mechanical characteristics of granular media and slope stability with super-high bench dumping site, pp. 19-33, (2011)
  • [6] ZHANG Tianwen, Mechnical experimental research and strength reconstruction mechanism of soil-rock mixture mass in surface coal mines, Xuzhou: China University of Mining and Technology, pp. 7-13, (2017)
  • [7] LI Pengyue, SHU Jisen, HAN Liu, Et al., Research on rolling rule for different sized rock on granular slope, Industrial Minerals ＆ Processing, 44, 3, (2015)
  • [8] WANG Guangjin, YANG Chunhe, ZHANG Chao, Et al., Research on particle size grading and slope stability analysis of super-high dumping site, Rock and Soil Mechanics, 32, 3, (2011)
  • [9] ZHANG Mo, WANG Bin, ZHOU Yuxin, Et al., Inversion analysis of safety factor on shear strength of waste dump bulk materials[J], Metal Mine, 5, pp. 171-174, (2015)
  • [10] GARCIA F E, BRAY J D., Modeling the shear response of granular materials with discrete element assemblages of sphere-clusters[J], Computers and Geotechnics, 106, (2019)
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