摘要
用一定量的粗骨料替代部分全尾砂进行胶结充填,不仅能够提高充填体的强度,还能减小充填体在载荷作用下的变形,满足了部分矿山较高的充填要求。胶结充填体的强度主要取决于充填料浆的配比,即骨料、胶凝材料、水的配比。本研究拟采用控制变量的试验方法,基于SEM电镜扫描和XRD试验,探究在废石—全尾砂混合骨料下胶结充填体强度及变形特性,探究废石掺量(≥40%)因素对胶结充填体强度以及变形破坏的影响规律和机理。研究表明:随着粗骨料的增加,充填体试样的单轴抗压强度逐渐减小。由于粗骨料含量太多,所形成的骨架太大,水化产物相对较少未能充分填满产生较多孔隙,对提高充填体强度产生了不利的影响。此外,随着废石掺量的增加,其强度有所下降,其破坏时的总应变量基本相同;其应力—应变曲线在初期基本重合,主要在端部裂隙闭合阶段之后逐渐分开。
Using a certain amount of coarse aggregate for exchanging part of the full tailings for cemented filling can not only improve the uniaxial compressive strength of the filling body,but also reduce the deformation of the filling body under the load,which meets the higher filling requirements of some mines.The uniaxial compressive strength of cemented backfill mainly depends on the concentration of filling slurry,that is,the ratio of aggregate,cementing material and water.This study intends to use the test method of controlled variables,based on SEM electron microscopy and XRD tests,to explore the strength and deformation characteristics of the cemented filling under the waste rock-full tailings mixed aggregate,and to investigate the strength and deformation of the cemented filling by the amount of waste rock(≥40%).With the increase of amount of the coarse aggregate,the uniaxial compressive strength of the filling sample gradually decreased.Because the amount of the coarse aggregate is too large,the formed skeleton is too large,the hydration products are relatively less,and relatively few hydration products fail to fill up sufficiently and produce more pores,which has an adverse effect on improving the strength of the filling.In addition,with the increase of the waste rock-aggregate ratio,its strength decreases,and its total strain at the time of failure is basically the same;its stress-strain curves basically coincide at the initial stage,and gradually separate after the end of crack closure stage.
作者
于恩毅
黄旭东
王珍岐
黄晢航
龚甲桂
Yu Enyi;Huang Xudong;Wang Zhenqi;Huang Zhehang;Gong Jiagui(School of Advanced Engineering,University of Science and Technology Beijing,Beijing 100083,China;Shandong Zhengyuan Geological Survey Institute of General Administration of Metallurgical Geology of China,Jinan 250014,China)
出处
《金属矿山》
CAS
北大核心
2020年第8期44-48,共5页
Metal Mine
关键词
废石掺量
废石—全尾砂胶结充填体
SEM电镜扫描
XRD
微观结构
强度和变形
Waste rock-aggregate ratio
Waste rock-full tailings cemented backfill
SEM scan with electric mirror
XRD
Microstructure
Strength and deformation
