In order to make the anchor bolt support prestress field fully diffuse in the composite rock stratum, improve the overall bearing capacity of surrounding rock, and give full play to the role of active support of the anchor bolt, a self-made 1:1-scale composite rock stratum similarity simulation test bed was used to compare and analyze the distribution of the anchor bolt support prestress field using different anchoring surrounding rock lithology and anchorage lengths, and the principle for optimum selection of anchoring parameters of composite rock stratum was proposed based on the test results. Considered from the point of view of stress diffusion, the effect of prestress diffusion of end anchorage bolts is better than that of lengthening anchorage; at the same time, the anchorage section should be preferentially arranged in hard rock, and the area of anchorage section near the free section should avoid the structural plane of surrounding rock. In conclusion, an industrial test was carried out under the conditions of a deep composite roof of the 2# coal seam in Qinyuan Mining Area, which determined a reasonable anchoring method and position of the composite roof under different conditions and achieved good results.
A large number of goafs left by coal mining in Jilin province has caused serious surface subsidence, which has brought serious hidden dangers to the goafs land and the transformation and upgrading of economic structure. To fill the gap in the research on surface deformation of coal mine goaf in Jilin province, the SBAS-InSAR technology was used to quantitatively analyze the surface deformation from 2017 to 2021 (Sentinel-1B orbital drop data, 957 scenes). The reliability of the monitoring results of InSAR technology was verified through accuracy assessment and field investigation. The development trend of surface deformation in coal mine goaf in Jilin province was analyzed and discussed. The results show that significant surface subsidence occurred in 11 goaf areas such as Yingcheng, Yangcaogou, and Shuangyang. The surface landfilling uplift was caused by subsidence control in the goafs of Meihekou, Wanbao, and Hunchun Fuqiang. From 2017 to 2021, the total subsidence area of coal goaf in Jilin province is 71.47 km2, with the maximum subsidence rate of 243.16 mm/a and the maximum cumulative subsidence amount of 1104.3 mm. During the monitoring period, the overall surface subsidence of the coal goaf in Jilin province is relatively slow. The nine goafs with more than heavy subsidence, such as Yangcaogou, Hunjiang, and Jiangyuan, have serious subsidence in the central areas, among which the Yangcaogou goaf subsidence is the most serious. The surface subsidence of coal mine goaf in Jilin province is mainly caused by large-scale mining of underground coal resources, and the "activation" of shallow goaf is an important factor. The formation lithology and engineering geological characteristics of soft rocks also play a certain role in promoting it.
With the rapid development of coal chemical industries, the production of solid waste gasification slag is increasing year by year. How to efficiently utilize gasification slag has become an urgent problem to be solved. In this paper, residual carbon (RC) obtained from coal gasification fine slag was activated by KOH wet method under different temperatures. The effects of activation temperature on the structure and electrochemical performance of activated residual carbon materials (RC-X) have been systematically studied. Compared with the specific surface area of 286 m2/g for RC, the specific surface area of the optimal activated carbon (RC-150) is up to 787 m2/g. RC-150 exhibited a remarkable specific capacitance of 109 F/g at 0.5 A/g in a three-electrode system. A symmetric supercapacitor was fabricated with RC-150 electrolyte, delivering an energy density of 3.78 Wh/kg and a power density of 254 W/kg. The supercapacitor displayed excellent cycle stability, maintaining 103.81
通过梳理当前矿区绿色转型过程中的具体做法、进展与成效,围绕企业、政府、群众多主体分析了矿区绿色转型工作面临的挑战和问题,从乡村振兴的视角提出了持续推动三大产业多元融合发展、创新矿区绿色转型工作体制机制、增强群众参与矿区绿色转型内驱动力等解决对策,对破解矿区建设困境、改善矿区生态环境、转变矿业发展方式、助力乡村振兴战略实施、推动矿区可持续发展提供借鉴.
为了解决目前带式输送机运行控制系统无法实现煤量运行匹配控制、无法进行故障自动诊断分析等不足,提出了一种新的煤矿井下主运带式输送机智能调控系统.通过智能控制模块、视频调速控制系统、高压变频控制方案实现了带式输送机系统根据煤量自动进行调整,通过故障预警模块实现了带式输送机系统运行状态的自动监测和诊断预警.实际应用表明,新的控制系统能够将带式输送机运行能耗降低 10.46%,将带式输送机运行故障率降低 77.6%,极大地提升了带式输送机系统的运行稳定性和可靠性.
