煤矿安全2024，Vol.55Issue(5)：1-10,10.DOI:10.13347/j.cnki.mkaq.20240526
废弃采空区封存CO2地表形变特征模拟研究
Simulation study on surface deformation characteristics of CO2 storage in abandoned goaf
摘要
Abstract
In order to explore the characteristics of surface deformation caused by supercritical CO2 injection into abandoned goaf,the general characteristics and evolution process of surface deformation were studied by FLAC3D simulation.The effects of porosity,CO2 injection rate and storage depth on surface deformation characteristics were discussed from five aspects,such as deformation range and deformation amount.The results show that the surface deformation caused by CO2 injection into the abandoned goaf is in the form of"inverted bowl"uplift,and experiences the evolution process of incubation stage,active stage and stable stage.As the surface point is far away from the goaf,the proportion of its displacement in the incubation stage and the stable stage gradually in-creases.The surface deformation range decreases significantly with the increase of CO2 storage depth,and is less affected by the change of porosity and CO2 injection rate.The surface displacement gradually decreases with the increase of porosity and CO2 stor-age depth,and is less affected by the change of CO2 injection rate.The duration of surface deformation is positively correlated with porosity and CO2 injection rate,and negatively correlated with CO2 storage depth.The proportion of the displacement of the surface point in the incubation stage and the stable stage is positively correlated with the number of time steps required and the porosity and storage depth,and negatively correlated with the CO2 injection rate.关键词
废弃矿井/CO2封存/采空区/地表形变/数值模拟Key words
abandoned mines/carbon dioxide storage/goaf/surface deformation/numerical simulation分类
矿业与冶金引用本文复制引用
郭庆彪,谢扬,汪锋,郑美楠..废弃采空区封存CO2地表形变特征模拟研究[J].煤矿安全,2024,55(5):1-10,10.基金项目
国家自然科学基金资助项目(52274164) （52274164）
安徽省优秀青年科学基金资助项目(2308085Y31) （2308085Y31）
中国科协青年托举人才工程资助项目(2022QNRC001) （2022QNRC001）
