Zhang Ji-Qiang, He Xiang, Yang Ke, Wei Zhen, Zhao Xin-Yuan, Fang Jue-Jing
State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan, 232001, China.
Key Laboratory of Mining Coal Safety and Construction Efficiency of Anhui Province and Ministry of Education, Anhui University of Science and Technology, Huainan, 232001, China.
Sci Rep. 2023 Aug 14;13(1):13226. doi: 10.1038/s41598-023-38165-y.
In order to deeply study the basic characteristics, diffusion laws, and flow laws of coal gangue and coal gangue slurry, the basic characteristic parameters of coal gangue and coal gangue slurry were obtained through particle size distribution test, electron microscope scanning test, X-ray diffraction test, X-ray fluorescence spectrum test, and angle of repose test. The conveying performance test of coal gangue slurry was carried out, and based on this, a simulation test of coal gangue slurry caving areas was designed. The diffusion and flow laws of coal gangue slurry under the same inclination angle were summarized, and the field test of fluidization filling in the caving areas was conducted. The results show that: (1) The water-to-gangue ratio was the main controlling factor for the conveying performance of coal gangue slurry. The extensibility, slump, and bleeding rate of the coal gangue slurry increased with the increase of the water-to-gangue ratio. (2) The diffusion profile of coal gangue slurry at different dip angles was arc-shaped, and the diffusion distance of slurry increased with the increase of infiltration time. However, there were differences in the sustained diffusion ability of different dip angles. (3) At the same time interval, the spatial accumulation patterns of scattered gangue in different regions will lead to differences in the diffusion speed of the slurry. (4) Both burying and hanging pipes in the falling area can safely and efficiently fill the gangue slurry. The diffusion distance of the caving areas in the test working face was basically consistent with the diffusion distance of the slurry in the simulation test of the coal gangue slurry caving areas.
为深入研究煤矸石及煤矸石浆体的基本特性、扩散规律和流动规律，通过粒度分布试验、电子显微镜扫描试验、X射线衍射试验、X射线荧光光谱试验和休止角试验，获得了煤矸石及煤矸石浆体的基本特性参数。开展了煤矸石浆体的输送性能试验，并在此基础上设计了煤矸石浆体垮落区模拟试验。总结了相同倾角下煤矸石浆体的扩散和流动规律，并进行了垮落区流化充填现场试验。结果表明：（1）水矸比是影响煤矸石浆体输送性能的主要控制因素。煤矸石浆体的扩展性、坍落度和泌水率随水矸比的增大而增大。（2）不同倾角下煤矸石浆体的扩散形态呈弧形，浆体扩散距离随渗透时间的增加而增大。但不同倾角下的持续扩散能力存在差异。（3）在相同时间间隔内，不同区域散体矸石的空间堆积形态会导致浆体扩散速度的差异。（4）垮落区埋管和吊管均可安全高效地充填矸石浆体。试验工作面垮落区的扩散距离与煤矸石浆体垮落区模拟试验中浆体的扩散距离基本一致。
