细粒含量对尾矿砂动力特性影响研究  

Study on the Effect of Fines Content on the Dynamic Properties of Tailing Sands

作　　者：刘金勇 蔡晓光 宋会彬[3] 郑学鑫[3,4] LIU Jinyong;CAI Xiaoguang;SONG Huibin;ZHENG Xuexin

机构地区：[1]江西铜业股份有限公司德兴铜矿,江西上饶334224 [2]中国地震灾害防御中心,北京100029 [3]中国恩菲工程技术有限公司,北京100038 [4]尾矿库灾害防控技术与装备国家矿山安全监察局重点实验室,北京100038

出　　处：《中国矿山工程》2025年第1期50-55,共6页China Mine Engineering

基　　金：国家重点研发计划资助项目“尾矿库水位动态精准监测与超前主动处置系统研发”(编号:2023YFC3012204)。

摘　　要：对于旋流器不同分级效果下的尾矿砂,在设计干密度和等压固结状态下,开展不同细粒含量尾矿砂的非饱和试样的共振柱试验,分析尾矿砂动模量和阻尼比与细粒含量有何种关系。试验结果表明,相同细粒含量条件下,最大动剪切模量与围压的变化规律一致。相同围压下,尾矿砂的最大动剪切模量随着细粒含量的增加而呈现降低趋势,说明细粒含量对尾矿砂抵抗剪切破坏的能力有一定的影响。在相同细粒含量下,三种尾矿砂的最大阻尼比均随着围压的增大而降低。由于临界细粒含量的存在,尾矿砂的最大阻尼比随着细粒含量的逐渐增多,其趋势表现为先上升后下降。本项研究成果可为不同细粒含量尾矿砂的动力反应分析提供基础数据,也可为地震高烈度地区中线法尾矿库的设计及管理提供参考依据。To explore the link between dynamic modulus and damping modulus of tailings sand,taking into account its fines content,the samples were conditioned under a specified dry density and isobaric consolidation,across different cyclone classification scenarios.This analysis sought to clarify how fines content affects the dynamic and damping behaviors of tailings sand,resonance column tests were conducted on unsaturated tailings sand samples with different fines contents.Test results indicated that at the same fines content,the maximum value of the dynamic shear modulus follows the law of variation of the ambient pressure.At the same pressure,the maximum dynamic shear modulus of the tailings sand showed a decreasing trend with increasing fines content,indicating that fines content has a certain effect on the shear damage resistance of the tailings sand.At the same fines content,the maximum damping modulus of the three tailings sands decreased with increasing ambient pressure.Due to the critical fines content,the maximum attenuation coefficients of the tailings sands tend to increase and then decrease with a gradual increase in fines content.The study′s outcomes furnish essential information for evaluating how tailings with varying fines content respond dynamically.These insights form a cornerstone for designing and managing intermediate tailings ponds in earthquake-prone areas.

关 键 词：细粒含量 尾矿砂 动力特性 共振柱试验 

分 类 号：TU411.8[建筑科学—岩土工程]