胶结充填体早期损伤对后期力学性能的影响  

Effect of early damage of tailings cemented backfill on later mechanical properties

作　　者：甘德清 张雅洁 刘志义 路燕泽 GAN Deqing;ZHANG Yajie;LIU Zhiyi;LU Yanze(School of Mining Engineering,North China University of Science and Technology,Tangshan 063210,Hebei,China;Hebei Province Key Laboratory of Mining Development and Safety Engineering,North China University of Science and Technology,Tangshan 063210,Hebei,China;Collaborative Innovation Center of Green Development and Ecological Restoration of Mineral Resources,North China University of Science and Technology,Tangshan 063210,Hebei,China;Mine Green Intelligent Mining Technology Innovation Center of Hebei Province,North China University of Science and Technology,Tangshan 063210,Hebei,China;Shahe Zhongguan Iron Ore Co.,Ltd.,Hebei Iron and Steel Group,Xingtai 054100,Hebei,China)

机构地区：[1]华北理工大学矿业工程学院,河北唐山063210 [2]华北理工大学河北省矿业开发与安全工程实验室,河北唐山063210 [3]华北理工大学矿产资源绿色开发与生态修复协同创新中心,河北唐山063210 [4]华北理工大学河北省矿山绿色智能开采技术创新中心,河北唐山063210 [5]河北钢铁集团沙河中关铁矿有限公司,河北邢台054100

出　　处：《河南理工大学学报（自然科学版）》2024年第2期1-7,共7页Journal of Henan Polytechnic University（Natural Science）

基　　金：国家自然科学基金资助项目(52204134);河北省自然科学基金资助项目(E2021209127);中央引导地方科技专项项目(236Z4105G)。

摘　　要：目的为了探明胶结充填体早期损伤对后期承载性能的影响,方法通过开展早期受损充填体经养护一定龄期后的单轴压缩试验,以损伤龄期和压损程度为变量,以受损充填体的后期变形特性、抗压强度、弹性模量为后期力学性能评价指标,分析充填体损伤龄期和压损程度对其后期力学性能的影响规律。结果结果表明:在同一损伤龄期下,充填体在80%压损下后期峰值应力及残余应力最低;压损程度对龄期3,7 d的充填体后期变形特性影响较小,对龄期14,21 d的充填体后期变形特性弱化作用较大;80%以下的压损程度对龄期3,7 d充填体后期抗压强度影响较小,各个压损程度对龄期14,21 d充填体后期抗压强度影响较大,压损程度越大,后期抗压强度越低;各龄期充填体后期弹性模量均随压损程度的增大而增大。养护龄期14 d之后的充填体受损后对其后期力学性能影响显著,且不同压损程度对龄期14 d之后的充填体后期力学影响显著。结论研究结果可为上向水平充填采矿方法中充填质量的控制提供理论指导。Objectives To explore the impact of early damage to cemented tailings backfill on its later bearing performance.Methods Uniaxial compression tests were conducted on early-damaged backfill after a certain age of maintenance.The damage age and degree were used as variables,and the later deformation characteristics,compressive strength,and elastic modulus of the damaged filling body were used as evaluation indicators for the later mechanical properties.The influence of the damage age and degree on the later mechanical properties of the filling body was analyzed.Results The results show that:at the same damage age,the late peak stress and residual stress of the backfill are the lowest at 80%compression loss;the degree of damage has less influence on the late deformation characteristics of the backfill with the age of 3 d and 7 d,and has a greater weakening effect on the late deformation characteristics of the backfill with the age of 14 d and 21 d;the degree of damage below 80%has less influence on the late compressive strength of the backfill with the age of 3 d and 7 d.Each degree of damage to the age of 14 d and 21 d filling body late compressive strength has a greater impact,the greater the degree of damage,the lower the late compressive strength;each age of the filling body late elastic modulus in⁃creases with the increase in the degree of compression damage.The damage to the filling body after 14 d of main⁃tenance has a significant impact on its later mechanical properties,and the degree of damage has a significant impact on the later mechanical properties of backfill after 14 d of maintenance.Conclusions The research re⁃sults can provide theoretical guidance for filling quality control in upward horizontal filling mining methods.

关 键 词：尾砂胶结充填体 早期损伤 应力-应变关系 抗压强度 

分 类 号：TD853[矿业工程—金属矿开采]