Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第30卷    第11期    总第260期    2020年11月

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文章编号:1004-0609(2020)-11-2746-12
基于粒径效应影响的尾矿毛细特性试验
刘 迪1, 3,卢才武2, 3,连民杰2, 3, 4,顾清华2, 3

(1. 西安建筑科技大学 材料科学与工程学院,西安 710005;
2. 西安建筑科技大学 资源工程学院,西安 710005;
3. 西安建筑科技大学 矿山系统工程研究所,西安 710005;
4. 中钢集团矿业开发有限公司,北京 100080
)

摘 要: 为探究尾矿粒径对尾矿坝毛细水上升的影响机制,利用自主研发的在线监测毛细水上升试验系统(简称OM-CRT系统),针对尾细砂、尾粉砂和尾粉土尾矿,分别开展不同粒径尾矿的毛细水上升全过程试验,得到了尾矿毛细水上升高度、上升速度与时间的关系曲线及拟合方程,并分析毛细带不同断面含水率随时间的变化规律和影响因素。结果表明:尾矿毛细水上升湿润锋与时间呈对数函数关系,试验初期毛细水上升速度较快,随着试验时间的延长,毛细水上升速度逐渐减小并最终降为0,且毛细水上升高度及速度与尾矿粒径呈负相关;不同断面的瞬时含水率变化与时间的关系类似于水土特征曲线呈“S”形,3个柱体中含水率变化均随高度增长而减小;尾粉土试样底端毛细带的含水率为23.77%,形成了300 mm的稳定饱和毛细带。通过建立毛细管径与尾矿粒径的关系,进一步推导出粒径与毛细水上升高度的关系。毛细水上升试验很好地验证了尾矿中吸力以及毛细作用的存在,进一步验证了界面作用的原理。研究结果可为建立考虑毛细作用影响下的坝体稳定性分析方法和理论奠定基础,同时可为边坡等工程的稳定性研究工作提供一种新思路。

 

关键字: 尾矿;粒径效应;毛细特性;毛细水上升高度;瞬时含水量;饱和毛细带

Experiment on tailings capillary characteristics based on particle size effect
LIU Di1, 3, LU Cai-wu2, 3, LIAN Min-jie2, 3, 4, GU Qing-hua2, 3

1. College of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China;
2. School of Resource Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China;
3. Institute of Mining System Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China;
4. Sinosteel Mining Co., Ltd., Beijing 100080, China

Abstract:Using a self-developed system for online monitoring capillary rise test (OM-CRT) to explore the effect characteristics of tailings particle size on capillary water rise of tailings dam, the whole process of capillary water rise was tested according to the tail fine sand, the tail silty sand and the tail silty soil of different particle sizes, the relation curves and fitting equations of the rise height, rise speed and time of capillary water in tailings are obtained, and the variation rule and influencing factors of water content in capillary zone in different profiles with time were analyzed. The results show that the wetting front and time is logarithmic relationship when the tailings capillary water rises. The capillary water rises quickly in early trial, but with the test time increasing, the capillary water rises slowly and stops rising eventually. Therefore, the height and velocity of capillary water rise are negatively correlated with the tailings particle size. The relation between the instantaneous water content change and time in different profiles is similar to the characteristic curve of water and soil, showing the shape of ‘S’. The moisture content in three cylinders decreases with the height increasing. The moisture content in the capillary zone of the bottom of the tail silty soil sample is 23.77%, which forms a stable saturated capillary band of 300 mm. Through the relation between capillary diameter and tailings particle size is established, and the relation between particle size and capillary water rising height is further deduced. The capillary water rising test proves the existence of suction and capillary action in tailings and further verifies the principle of interface action. The research results can lay a foundation for the dam stability analysis method and theory under the influence of capillarity, and provide a new approach for the stability study of slope engineering.

 

Key words: tailings; particle size effect; capillary characteristics; capillary water rising height; instantaneous water content; saturation capillary zone

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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