充填料浆泌水特性及其细观结构演变  

Bleeding Characteristics and the Evolution of Microstructure ofTailings Backfill Slurry

作　　者：谢经鹏 杨柳华 郑攻关 李一凡 XIE Jingpeng;YANG Liuhua;ZHENG Gongguan;LI Yifan(Anhui Copper Crown Industry Technology Research Institute Co.,Ltd.,Tongling 244000,China;School of Civil and Engineering,Henan Polytechnic University,Jiaozuo 454000,China)

机构地区：[1]安徽铜冠产业技术研究院有限责任公司,安徽铜陵244000 [2]河南理工大学土木工程学院,河南焦作454000

出　　处：《绿色矿冶》2024年第4期1-7,共7页Sustainable Mining and Metallurgy

基　　金：国家自然科学基金资助项目(52104129);河南省双一流学科建设专项项目(AQ20230735)。

摘　　要：充填料浆泌水对接顶率、挡墙压力及充填体力学性能均有较大影响,然而目前对料浆的泌水机制认识不明。为此,研究了灰砂比、料浆质量分数、颗粒级配及减水剂掺量对充填料浆泌水特征的影响,同时结合计算机断层扫描技术(CT)分析了泌水过程细观结构的演变。研究结果表明,料浆的泌水受到颗粒级配、灰砂比、质量分数及减水剂掺量的影响,增加细颗粒含量、灰砂比、质量分数均可以显著降低料浆的泌水,而掺入减水剂提高料浆泌水离析的风险。结合CT测试结果和多孔网络建模,充填料浆泌水过程可划分为5个阶段:诱导期、加速期、恒定期、密实期及固结期,在整个泌水周期内伴随着泌水通道的形成、发育及闭合演变。研究结果对深入认识料浆泌水过程以及实现充填料浆泌水调控具有重要意义。Bleeding of backfill material has a significant impact on the backfill rate,retaining wall pressure,and mechanical properties of the backfill body,but the current understanding of the bleeding mechanism is unclear.Therefore,the effects of the ash-sand ratio,quality ratio,particle size distribution,and superplasticizer dosage on the bleeding of backfill material were studied,and the evolution of the microstructure during the bleeding process was tested using CT technology.The results show that the bleeding of the backfill material is affected by the particle size distribution,ash-sand ratio,quality ratio,and superplasticizer dosage,and increasing the fine particles,ash-sand ratio,and quality ratio can significantly reduce the amount of bleeding,while adding superplasticizer increases the risk of bleeding.Based on the CT test results and Porous Network Modeling,the bleeding process of backfill material can be divided into five stages:induction period,accelerating period,constant period,consolidation period,and final consolidated period.The formation,development,and closure of the channels occur throughout the entire bleeding cycle.The research results are of great significance for deepening the understanding of the slurry bleeding process and achieving the regulation of slurry bleeding.

关 键 词：料浆泌水 细观结构 泌水通道 减水剂 

分 类 号：TD853[矿业工程—金属矿开采]