强降雨工况尾矿库堆排坝体稳定性分析  

Stability Analysis of Tailings Dam Stacking Under Heavy Rainfall

作　　者：于浩泽 高义军 郭奇峰[1] 刘文胜 潘继良 张文飞 YU Haoze;GAO Yijun;GUO Qifeng;LIU Wensheng;PAN Jiliang;ZHANG Wenfei(School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;Nanshan Mining Co.,Ltd.,Anhui Magang Mining Resources Group Co.,Ltd.,Maanshan 243000,China)

机构地区：[1]北京科技大学土木与资源工程学院,北京100083 [2]安徽马钢矿业资源集团南山矿业有限公司,安徽马鞍山243000

出　　处：《金属矿山》2022年第10期209-217,共9页Metal Mine

基　　金：国家重点研发计划项目(编号:2021YFC3001301);中央高校基本科研业务费专项资金项目(编号:FRF-IDRY-20-032)。

摘　　要：针对凹山尾矿库和其堆排坝体,探讨强降雨作用下堆排尾矿库原坝渗流场特征及稳定性的变化,从而全面评估坡面堆排后尾矿库运行安全性。以现场勘测数据为基础,在ABAQUS有限元分析软件中建立二维模型,采用饱和—非饱和渗流理论对尾矿坝在强降雨作用下的渗流场进行分析,并基于强度折减法理论求得坝体稳定性安全系数。研究结果表明,由于降雨入渗提高了表层土饱和度,增加了基质吸力,减小了雨水的下渗速度,因此坝体坡面堆排有效地防止了原坝渗流场发生改变,保护了原坝体稳定,同时堆排体本身也因基质吸力减小而抗剪强度减小,本该出现在原始坝体内部的危险滑动面都出现在了堆排体内部。本研究为尾矿库坡面堆排提供了技术经验,并为尾矿库的堆排监测和滑坡预防提供重要参考依据。Aiming at the Aoshan tailings pond and its stacking dam body,this paper discusses the change of the seepage field characteristics and stability of the original dam of the tailings pond under the action of heavy rainfall,so as to comprehensively evaluate the operation safety of the tailings pond after the slope is discharged.Based on the field survey data,a two-dimensional model was established in the ABAQUS finite element analysis software,and the saturated-unsaturated seepage theory was used to analyze the seepage field of the tailings dam under the action of heavy rainfall,and the dam was obtained based on the strength reduction method theory.The research results show that since the rainfall infiltration increases the saturation of the topsoil,increases the suction force of the matrix,and reduces the infiltration rate of the rainwater,the stacking body effectively prevents the seepage field of the original dam from changing.The stability of the original dam is protected,and the shear strength of the stack body itself is also reduced due to the reduction of matrix suction.The dangerous sliding surfaces that should have appeared inside the original dam body all appeared inside the stack body.This study provides technical experience for tailings pond stacking and dumping,and provides an important reference for tailings pond stacking and drainage monitoring and landslide prevention.

关 键 词：尾矿库 坡面堆排 降雨入渗 ABAQUS 边坡稳定性 

分 类 号：TD926[矿业工程—选矿]