基于DIC技术的矿岩散体剪切运动特征研究  

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

作　　者：金爱兵[1,2] 姚宝顺 唐坤林 孙浩[1,2] 赵怡晴 JIN Aibing;YAO Baoshun;TANG Kunlin;SUN Hao;ZHAO Yiqing(Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mines,University of Science and Technology Beijing,Beijing 100083,China;School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;China Enfi Engineering Corporation,Beijing 100038,China)

机构地区：[1]北京科技大学金属矿山高效开采与安全教育部重点实验室,北京100083 [2]北京科技大学土木与资源工程学院,北京100083 [3]中国恩菲工程技术有限公司,北京100038

出　　处：《中南大学学报（自然科学版）》2022年第8期3081-3091,共11页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(52004017,51804018);中国博士后科学基金资助项目(2020M670138);中央高校基本科研业务费专项资金资助项目(FRF-TP-19-026A1)。

摘　　要：为探究散体边坡滑坡特性,揭示矿岩散体剪切作用下运动特征,利用自主设计制作的可视化剪切模型并基于数字图像相关技术(digital image correlation method,DIC)开展矿岩散体直剪试验,研究剪切作用下矿岩散体颗粒剪切面颗粒运动、局部应变和剪切带的演变等。研究结果表明:1)在距剪入口1/3剪切面长度处剪胀效应发生突变,表现为颗粒位移和旋转的加速度正负发生改变;2)随着剪切率增加,局部应变分布由随机位置逐渐向剪切面聚集转变,剪切面局部应变概率密度以及上下两部分最大剪切带厚度随时间均呈logistics函数形式变化;3)局部应变贯穿剪切面形成类似于“半梭形”剪切带,上部呈圆弧面,上下两部分最大厚度差为颗粒中位粒径的2~3倍;4)散体边坡滑坡中也有类似直剪试验的颗粒运动突变点,在距剪入口1/3剪切面长度处进行治理能够有效预防边坡滑坡。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.

关 键 词：矿岩散体 直剪试验 局部应变 剪切带 DIC 

分 类 号：TD804[矿业工程—矿山开采] O347.7[理学—固体力学]