Experimental study on acoustic emission characteristics of cemented rock-tailings backfill
Experimental study on acoustic emission characteristics of cemented rock-tailings backfill
复制标题
胶结尾矿充填体声发射特性试验研究
DOI：
10.1016/j.conbuildmat.2021.125278
复制
发表时间：
2021-12-02
影响因子：
7.4
通讯作者：
Kang, Wei
中科院分区：
文献类型：
--
作者：
Qiu, Huafu;Zhang, Fushun;Kang, Wei
尾砂胶结充填是矿山充填的重要发展方向。针对尾砂胶结充填材料，进行了不同灰砂比（1：4、1：6、1：8）和废石含量（0%、10%、20%、30%、40%）的充填体单轴压缩声发射特性试验研究。通过声发射振铃计数、累计击数和r值特征分析，得到了充填体的强度和变形特征，揭示了灰砂比和废石含量对充填体力学性能的影响机理。结果表明：随着废石含量的增加，充填体原生孔隙增多，充填体弹性减小，塑性增大，充填体单轴抗压强度先增大后减小，充填体破坏后残余强度增大。通过SEM和XRD分析，发现充填体水化产物主要为C-S-H，其次为AFt和Ca（OH）2，C-S-H是水泥基材料强度的主要来源。
Cemented tailings backfill is an important development tendency of mine filling. Aiming at the cemented rocktailings backfill material, the experimental tests on the acoustic emission characteristic of the backfill body under uniaxial compression was carried out, in which different cement-sand ratios (1:4, 1:6, 1:8, respectively) and waste rock contents (0%, 10%, 20%, 30%, 40%, respectively) were adopted. Through characteristics analysis of AE ringing count, cumulative hits and r value, the strength and deformation characteristics of the backfill body were obtained, and the influence mechanism of cement-sand ratio and waste rock content on the mechanical properties of the backfill body was revealed. The results indicated that as the waste rock content increased, the primary pores of the backfill body increased, the elasticity of backfill reduced, the plasticity of backfill increased, the uniaxial compression strength of the backfill body firstly increased and then decreased, the residual strength in the post-failure stage of backfill increased. Through analysis of microstructure by SEM and XRD tests, it was found that the most hydration products of the backfill body were C-S-H, followed by AFt and Ca (OH) 2, while the C-S-H was the main source of the cement-based materials strength.