摘要
尾砂浆的流变特性是充填设计的重要参数,结合山东某金矿充填的具体工况,采用恒定剪切速率加载试验、料浆结构动力学理论对分级细尾砂浆流变特性进行研究,建立了恒定剪切速率作用下分级细尾砂浆的流变模型,并运用线性规划理论获得了恒定剪切速率为2 s^(-1)、20 s^(-1)、80 s^(-1)和180 s^(-1),质量浓度为74%时的流变模型具体表达式。研究结果表明:分级细尾砂浆在恒定剪切速率加载过程中,所受剪切应力随时间的增长而逐渐减小并最终趋于稳定;分级细尾砂浆的流变模型为指数型函数,理论模型曲线与试验结果的决定系数R2分别为0.9897, 0.9785, 0.9612和0.9583,模型曲线与试验结果拟合度较高;应用该模型对质量浓度为72%,灰砂比为1∶4的尾砂浆流变行为进行验证,模型所得理论计算值与实测值之间的误差小于3%,研究结果可为同类型矿山充填设计提供参考。
The rheological properties of tailings slurry are important parameters in filling design.Based on the specific filling conditions of a gold mine in Shandong,constant shear rate loading tests and slurry structure dynamics theory were used to study the rheological properties of graded fine-tailings slurry.The rheological model of graded fine-tailings slurry under constant shear rate was established.The linear programming theory was used to obtain the specific expressions of the rheological model when the constant shear rate was 2s^(-1),20s^(-1),80s^(-1) and 180s^(-1),and the mass concentration was 74%.The results show that the shear stress of the graded fine-tailings slurry gradually decreases with the increase of time and finally tends to be stable during the loading with constant shear rate.The rheological model of the graded fine-tailings slurry is an exponential function,and the decision coefficient R2 between the theoretical model curve and the test results is 0.9897,0.9785,0.9612and 0.9583,respectively.The model curve fits well with the test results.The model was used to verify the rheological behavior of graded fine-tailings slurry with mass concentration of 72%and cement-sand ratio of 1∶4.The error between the theoretical calculation value and the measured value obtained by the model is less than 3%.The research results can provide a reference for the filling design of the same type of mines.
作者
王贤情
万文
盛佳
卢振兴
唐骁宇
WANG Xianqing;WAN Wen;SHENG Jia;LU Zhenxing;TANG Xiaoyu(School of Resource&Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan,Hunan 411201,China;Changsha Institute of Mining Research Co.,Ltd.,Changsha,Hunan 410012,China;State Key Laboratory of Metal Mine Safety Technology,Changsha,Hunan 410012,China)
出处
《矿业研究与开发》
CAS
北大核心
2024年第6期42-48,共7页
Mining Research and Development
基金
国家自然科学基金项目(51774132)
湖南省自然科学基金项目(2021JJ30265)。
关键词
充填采矿
分级细尾砂浆
恒定剪切速率
流变模型
Backfill mining
Graded fine-tailings slurry
Constant shear rate
Rheological model
