Xie Shengrong, Pan Hao, Gu Wenzhe, Zhu Lei, Yue Dong, Chen Dongdong, Song Tianqi, Jiang Zaisheng
School of Energy and Mining Engineering, China University of Mining and Technology-Beijing, Beijing, 100083, China.
Chinacoal Research Institute Co. Ltd, Xian, 710054, China.
Sci Rep. 2023 Nov 23;13(1):20536. doi: 10.1038/s41598-023-47621-8.
Based on the greening and low interference disposal requirements of coal gangue in high-yield and high-efficiency mines in Inner Mongolia and Shaanxi, and by integrating the existing theories and technologies such as underground filling technology of coal gangue, mine yellow mud grouting technology, and the evolution law of mining overburden fractures, a technology of filling goaf with coal gangue slurry for green disposal of coal gangue is proposed. The principle and technical framework of the technology of filling goaf with coal gangue slurry are clarified. This paper expounds on the technological process of technology of filling goaf with coal gangue slurry, establishes three types of slurry filling systems, such as centralized ground layout, ground and underground coordinated layout, and centralized underground layout, and constructs three slurry filling methods, including low-level grouting, adjacent level grouting, and high-level grouting, forming seven kinds of technology models of filling goaf with coal gangue slurry, including ground centralized pulping + high-level grouting, ground centralized pulping + adjacent grouting, ground centralized pulping + low level grouting, ground and underground coordinated pulping + adjacent grouting, ground and underground coordinated pulping + low level grouting, underground centralized pulping + adjacent grouting, and underground centralized pulping + low level grouting, and gives the selection process of technology models of filling goaf with coal gangue slurry. Based on the different conditions and requirements of Haidaze Coal Mine and Huangling No. 2 Coal Mine, engineering tests were carried out on two different technology modes, namely, ground and underground coordinated pulping + low level grouting and ground and underground coordinated pulping + adjacent grouting, based on simulation tests of low level grouting and adjacent grouting. The tests prove the feasibility of filling goaf with coal gangue slurry and explore the way for the theoretical research of the technology of filling goaf with coal gangue slurry and greening and low interference disposal of coal gangue.
基于内蒙古、陕西高产高效矿井煤矸石绿化及低干扰处置要求，综合煤矸石井下充填技术、矿井黄泥灌浆技术、采动覆岩裂隙演化规律等现有理论与技术，提出了一种利用煤矸石浆体充填采空区实现煤矸石绿色处置的技术。阐明了煤矸石浆体充填采空区技术的原理及技术框架。阐述了煤矸石浆体充填采空区技术工艺流程，建立了地面集中布置、地面与井下协同布置、井下集中布置3种浆体充填系统，构建了低位注浆、邻位注浆、高位注浆3种浆体充填方法，形成了地面集中制浆+高位注浆、地面集中制浆+邻位注浆、地面集中制浆+低位注浆、地面与井下协同制浆+邻位注浆、地面与井下协同制浆+低位注浆、井下集中制浆+邻位注浆、井下集中制浆+低位注浆7种煤矸石浆体充填采空区技术模式，并给出了煤矸石浆体充填采空区技术模式的选择流程。基于海大泽煤矿和黄陵二号煤矿的不同条件与要求，在低位注浆和邻位注浆模拟试验基础上，对地面与井下协同制浆+低位注浆、地面与井下协同制浆+邻位注浆2种不同技术模式进行了工程试验。试验证明了煤矸石浆体充填采空区的可行性，为煤矸石浆体充填采空区技术的理论研究及煤矸石绿化与低干扰处置探索了途径。
