高台阶排土场粒径分布特征与抗剪强度特性  

Particle Size Distribution and Shear Strength Characteristics of High Slope Waste Dump

作　　者：杜俊 侯克鹏[2,3] 程涌 李晨晨 DU Jun;HOU Ke-peng;CHENG Yong;LI Chen-chen(College of Architecture and Civil Engineering,Kunming University,Kunming 650214,Yunnan,China;Faculty of Land Resource Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan,China;Yunnan Key Laboratory of Sino-German Blue Mining and Utilization of Special Underground Space,Kunming 650093,Yunnan,China;Yunnan Yarong Mining Technology Co Ltd,Kunming 650093,Yunnan,China)

机构地区：[1]昆明学院建筑工程学院,云南昆明650214 [2]昆明理工大学国土资源工程学院,云南昆明650093 [3]云南省中-德蓝色矿山与特殊地下空间开发利用重点实验室 [4]云南亚融矿业科技有限公司,云南昆明650093

出　　处：《矿冶工程》2022年第6期29-33,39,共6页Mining and Metallurgical Engineering

基　　金：云南省地方本科高校基础研究联合专项资金项目(202001BA070001-066);云南省省级“放管服”科研项目(2019-1-C-25318000002187)。

摘　　要：以南加排土场高台阶排土工程为例,运用颗粒分析试验测定土体粒径分布规律,并设计不同粗粒含量的重塑土样进行室内直剪试验。结果表明,排土台阶自上而下,粒径大于5 mm的粗颗粒含量由43.2%增至95.7%,其中粒径5~60 mm的颗粒含量先增后减,且最大含量58.6%位于台阶中下部;台阶底部多为超大粒径块石并呈现为颗粒架空结构。级配组成不同的重塑土样在受剪切变形时,剪切面萌生与扩展伴随有块石的旋转、咬合与翻滚,出现塑性流动破坏。土样应变硬化与剪缩特征显著,竖向荷载愈大,硬化现象与剪缩变形愈加明显,粗粒含量增多,土样剪缩变形量减小。从排土台阶坡顶至坡底,土体黏聚力减小而内摩擦角增大。With Nanjia high slope waste dump as an example,the distribution law of particle size of soil was investigated by particle analysis test,and an indoor direct shear test was conducted using the remolded soil with different content of coarse particles.The results show that the content of coarse particles(partical size more than 5 mm)increases from 43.2%to 95.7%downward the slope,and the content of particles with size in the range of 5 mm to 60 mm decreases after an initial increase,maximally up to 58.6%in the middle and lower part of the slope.There are more oversized particles distributed on the bottom of the slope,forming a structure with large voids.The initiation and expansion of the shear plane of the remolded soil samples with different content of coarse particles were accompanied by the rotation and rolling of rocks,resulting in plastic flow failure.The shear properties of soil show the characteristics of strain hardening and shear shrinkage.And the larger vertical load can lead to more obvious hardening phenomenon and shear shrinkage deformation.With an increase in the content of coarse particles,the shear shrinkage deformation of soil decreases.The soil cohesion decreases and internal friction angle increases from the top to the bottom of the dump slope.

关 键 词：高台阶排土场 土石混合体 粒径分布 抗剪强度 

分 类 号：TD854[矿业工程—金属矿开采]