文献类型：期刊文献

英文题名：Filling Treatment of Surface Subsidence Resulted From Underground Mining in a High-Altitude Mine

作者：Deng, Daiqiang Cao, Guodong Liang, Yihua

第一作者：Deng, Daiqiang;邓代强

通信作者：Cao, GD[1];Liang, YH[2]

机构：[1]Xiangtan Univ, Coll Civil Engn & Mech, Xiangtan, Peoples R China;[2]Guizhou Inst Technol, Coll Min Engn, Guiyang, Peoples R China;[3]Guizhou Inst Technol, Guizhou Ind Dev Res Ctr, Guiyang, Peoples R China

第一机构：Xiangtan Univ, Coll Civil Engn & Mech, Xiangtan, Peoples R China

通信机构：corresponding author), Xiangtan Univ, Coll Civil Engn & Mech, Xiangtan, Peoples R China;corresponding author), Guizhou Inst Technol, Guizhou Ind Dev Res Ctr, Guiyang, Peoples R China.|贵州理工学院;

年份：2021

卷号：8

外文期刊名：FRONTIERS IN MATERIALS

收录：;EI(收录号：20214611144260);Scopus(收录号：2-s2.0-85118719622);WOS:【SCI-EXPANDED(收录号:WOS:000717376700001)】；

基金：The authors gratefully acknowledge support for this research from the National Natural Science Foundation of China (51764009), and the Guizhou Province Science and Technology Support Plan Project Grant No. (2018)2836, and the Scientific Research Fund of Hunan Province Education Department (20A475), and the High-level Talent Gathering Project in Hunan Province (2019RS1059).

语种：英文

外文关键词：high-altitude mine; portland slag cement; surface collapse and damage; blast furnace slag; environmental protection

摘要：In the process of filling the goaf of Huashugou copper mine, the filling aggregate was the mine's self-produced copper flotation tailings. The physical and chemical property tests showed that the tailings were relatively fine, and the cumulative contents of the 7.5, 15, 80, and 90 mu m particles were 56.99, 79.46, 99.88, and 100%, respectively. PSA42.5 Portland slag cement was selected as the cementing material for the tests. The amount of finely ground blast furnace slag added to the cement was 20-50%. The filling test blocks of all proportions were demolded within 24-36 h, and the integrity of the formed filling bodies was satisfactory. Among them, the uniaxial compressive strength of the test block formed by the filling slurry with a tailings-to-cement ratio of 3/1 and a concentration of 74% after 3, 7, 28, and 60 days reached 0.833, 2.026, 4.520, and 6.560 MPa, respectively. The strengths of the other filling blocks also met the engineering design requirements. Based on the statistical regression analysis method, the influences of the slag cement content chi(1) and the tailings water content chi(2) on the filling body's strength sigma were analyzed. The regression calculation also considered the interaction between chi(1) and chi(2), and the obtained multiple nonlinear regression model successfully predicted sigma. In production and application, the large density of tailings would accelerate their settling, which could easily cause blockage during the transportation of filling slurry through the pipeline. Regarding a series of existing filling materials and technical conditions, the filling process investigated in this study overcomes several unfavorable conditions. Using advanced and reliable technology and an industrial filling pump with a delivery pressure of 10 MPa, the prepared filling slurry concentration was 68-72% and the flow rate was 56-79 m(3)/h. The tailings and PSA42.5 Portland slag cement combined quite well. The filling body in the goaf demonstrated excellent homogeneity, and the various industrial indicators met the technical requirements for mining deposits. The preparation of high-quality filling materials with a smooth filling process has played a positive role in the prevention and treatment of surface mountain cracks and collapse during underground mining in high-altitude areas.