On the occasion of the 75th anniversary of the founding of New China, Professor Fan Limin's team at China University of Mining and Technology has made important breakthroughs in the field of water-preserving mining technology for extra-thick coal seams, presenting a generous gift for the National Day.
In the 24 mining areas of Jurassic coal seams in the Ordos Basin in western my country, mainly in the Shaanxi North, Shendong and Huanglong coal bases, there are large areas of extra-thick coal seams with a single layer thickness of more than 8 meters. The protection of the roof aquifer structure and the control of groundwater levels for the mining of extra-thick coal seams have always been a problem that needs to be solved urgently.
Since 2021, Professor Fan Limin's team at China University of Mining and Technology has cooperated with Shaanxi Yulin Energy Group Yushen Coal and Electricity Co., Ltd., using theories and methods of multiple disciplines such as geology, hydrogeology and engineering geology, mining and big data, and proposed the goal of increasing the recovery rate of extra-thick coal seams under the conditions of water preservation, water control, water reduction and water use.
After more than three years of continuous research and engineering practice, the project team completed the "Key Technology and Engineering Application of Water-Retaining Mining of Extra Thick Coal Seams in Areas Covered by Thick Soil Layers", which recently passed the scientific and technological achievement appraisal organized by the Zhongguancun Green Mining Industry Alliance. The appraisal committee, headed by Academician Peng Suping of the Chinese Academy of Engineering, highly praised this achievement and believed that it has reached the international leading level overall.
It is reported that the achievement uses Yushuwan and Yinhe Coal Mines under Yushen Coal and Electricity Co., Ltd. as the water-retaining mining engineering verification area, and has made important progress in the identification technology of mine water sources under multi-stage aquifers, the mechanism of direct water release between mining and thick soil layers, and the prediction technology and methods of water inflow, and new water-retaining coal mining technology. Using technologies such as microorganisms, isotopes and full ion testing, the source of mine water was accurately determined, and the water inflow of mines was predicted using technical methods such as the mechanism of direct water release between mining and mining. Under the condition of accurately determining the source and amount of mine water, with the goal of controlling the groundwater level of the Sarawusu Formation, using roof loss reduction mining technology as a means, and monitoring the self-repair of the water-proof performance of the thick soil layer in the goaf, the primary mining height of the working face was increased, and the mining height of the 20116 and 20118 working faces of Yushuwan Coal Mine was increased from the originally planned 5.10 meters to 5.80 meters. The mining height of the 30305 and 30306 working faces of Yinhe Coal Mine was increased from 5.50 meters to 6.50 meters. The coal recovery rate increased by 13.7% and 18.2% respectively.
Technology provided by the Information Center of CIGEM
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