采矿与岩层控制工程学报2026，Vol.8Issue(4)：126-141,16.DOI:10.13532/j.jmsce.cn10-1638/td.2025-1296
弱胶结充填体强度特性及其对重金属浸出抑制机理
Strength characteristics of weakly cemented backfill and its inhibition mechanism on heavy metal leaching
摘要
Abstract
The strength design of cemented backfill must simultaneously ensure stope stability and control the risk of heavy metal leaching.However,the mechanisms of long-term strength degradation and the critical condition for binder dosage remain unclear under prolonged service environments.Accordingly,this study investigates the performance evolution of weakly cemented backfill under chemical erosion,targeting four heavy metals(Pb,Cu,Zn,Cr),through static leaching tests,SEM,and XRD analysis.The results indicate that:① Cr exhibits the highest stability,followed by Pb and Zn,while Cu is the most susceptible to morphological transformation due to environmental and chemical influences.② The long-term stability of the backfill is highly dependent on the ambient pH.Specimens with a binder-to-tailings ratio of 1∶10 achieved the highest 90 d strength(2.11 MPa)under neutral conditions(pH=7),whereas those with a 1∶20 ratio showed the lowest strength(0.63 MPa)in an alkaline environment(pH=10).Acidic conditions induced early-stage erosion,while alkalinity led to late-stage expansion and degradation.③ The binder-to-tailings ratio significantly influences the immobilization efficiency.The highest leaching concentrations for Pb,Cu,Zn,and Cr were observed at the 1∶20 ratio,measuring 0.000 95,0.94,0.86,and 0.014 7 mg/L,respectively—approximately 2 to 3 times higher than those at the 1∶10 ratio.Despite this increase,all values complied with the Class III standards of the"Quality Standard for Groundwater"(GB/T 14848-2017).This research clarifies the interrelationships among environmental conditions,mix proportion,and backfill performance,providing a critical basis for the design of backfill in green mining.关键词
强度特性/重金属固化/胶材掺量/微观结构演变/水化产物Key words
strength characteristics/heavy metal immobilization/binder dosage/microstructural evolution/hydration product分类
矿业与冶金引用本文复制引用
焦华喆,李振龙,张庆澳,靳翔飞,许军强,王哲,王建栋,李公成,龚剑,周淼..弱胶结充填体强度特性及其对重金属浸出抑制机理[J].采矿与岩层控制工程学报,2026,8(4):126-141,16.基金项目
国家自然科学基金面上资助项目(52374121) （52374121）
国家重点研发计划资助项目(2023YFC2907203) （2023YFC2907203）
河南省科技研发计划联合基金(重点项目)资助项目(235200810016) （重点项目）
