Model and selection criterion of zonal preact grouting to prevent mine water disasters of coal floor limestone aquifer in North China type coalfield
(2.Xi’an Research Institute Co., Ltd., China Coal Technology and Engineering Group Corp., Xi’an, Shaanxi Province, China 710077)
(3.Shaanxi Key Laboratory of Coal Mine Water Hazard Prevention and Control Technology, Xi’an, Shaanxi Province, China 710077)
【Abstract】The authors analyze and summarize the coal seam occurrence and hydrogeological conditions of the Carboniferous-Permian coalfields in China to promote the development of zonal preact grouting technology and establish a system of the technology to prevent mine water disasters of coal floor aquifer. With the engineering systematicity as the starting point, we focus on the three main factors of drilling conditions, grouting layer selection and drilling technology in the engineering of zonal preact grouting to prevent mine water disasters of coal floor aquifer. The model of zonal preact grouting to prevent mine water disasters of coal floor aquifer is established, which can be applied to the geological and hydrogeological conditions of the North China type coalfields. Combined with the identification of coal seam depth, water pressure on coal seam floor and structural combination of floor rock formation, the selection criteria of various governance modes are determined. Then combined with the two additional indicators of drilling patterns and grouting materials, the sub-class model of advanced zonal governance is further divided. With the practice of three major zonal preact grouting projects in the Huaibei mining area and the Hancheng mining area as examples, the selection principle and engineering application effects are analyzed. The results show that the model classification method can cover all zonal preact grouting engineering in China. The research provides guidance for the selection of the zonal preact grouting engineering models of coal seam floor aquifers and the implementation of the grouting project.
【Keywords】 North China type coalfield; Ordovician limestone; Taiyuan Formation limestone; floor water inrush; model of zonal preact grouting; grouting;
 DONG Shuning. Some key scientific problems on water hazards frequently happened in China’s coal mines [J]. Journal of China Coal Society, 2010, 35 (1): 66–71 (in Chinese).
 ZHANG Zhaoqiang, KONG Xiangxun. Harness technology for karst water in Ordovician limestone with underground grouting of hole [J]. Coal Geology of China, 2003, 15 (2): 41–43 (in Chinese).
 WU Qiang. Interpretation of coal mine water prevention and control rules [M]. Beijing: Coal Industry Press, 2018: 114–120 (in Chinese).
 DONG Shuning, HU Weiyue. Basic characteristics and main controlling factors of coal mine water hazard in China [J]. Coal Geology & Exploration, 2007, 35 (5): 34–37 (in Chinese).
 DONG Shuning, LIU Qisheng. Study on relative aguiclude existed in Mid-Ordovician limestone top in North China coal field [J]. Journal of China Coal Society, 2009, 34 (3): 289–292 (in Chinese).
 LI Jingyang, ZHU Lijun. On modern weathering crust and palaeo-weathering crust of carbonate rock [J]. Carsologica Sinica, 2004, 34 (1): 56–62 (in Chinese).
 DONG Shuning, WANG Hao, ZHANG Wenzhong. Judgement criteria with utilization and grouting reconstruction of top Ordovician limestone and floor damage depth in North China coal field [J]. Journal of China Coal Society, 2019, 44 (7): 2216–2226 (in Chinese).
 CHEN Shiyue. Control of sea-level change to coal accumulation in Carboniferous-Permian, North China [J]. Coal Geology&Exploration, 2000, 28 (5): 8–11 (in Chinese).
 WU Jiwen, JIANG Zhenquan, SUN Benkui. Influence of coal seam mining on floor and its engineering application [M]. Xuzhou: China University of Mining and Technology Press, 2011: 10–27 (in Chinese).
 ZHAO Qingbiao. Ordovician limestone karst water disaster regional advanced governance technology study and application [J]. Journal of China Coal Society, 2014, 39 (6): 1112–1117 (in Chinese).
 SHI Zhiyuan. Application of horizontal well drilling method in high-pressure karst water hazards region advanced management of coal floor [J]. Safety in Coal Mines, 2015, 46 (Sup. 1): 67–70 (in Chinese).
 LI Xiaolong, ZHANG Hongqiang, HAO Shijun, et al. Key techniques for directional drilling&construction for control of coal floor Ordovician limestone karst water disaster [J]. Coal Science and Technology, 2019, 47 (5): 64–70 (in Chinese).
 LIU Zaibin. Study on reconstruction method of shallow limestone aquifer based on each embedded jetting [J]. Coal Technology, 2018, 37 (6): 46–48 (in Chinese).
 ZHENG Shitian. Application of complete set of surface bedding borehole exploration and grouting technology on floor high pressure karst water hazard governance [J]. Coal Geology of China, 2018, 30 (8): 53–57 (in Chinese).
 WANG Hao, LUO Ankun, Dong Shuning, et al. Utilizability research on the top layer of Ordovician limestone as aquiclude of coal seam floor [J]. China Coal, 2018, 44 (1): 34–38 (in Chinese).
 SHI Hao. Application of precise directional drilling technology in coal mine water hazard treatment [J]. Coal Engineering, 2018, 50 (3): 75–78 (in Chinese).
 LIU Hongbin, TANG Weiqi, XIAO Kailu, et al. Research progress of cement-based grouting materials [J]. Concrete, 2016 (3): 71–75 (in Chinese).
 ZHENG Shitian. Advanced exploration and control technology of limestone water hazard in coal seam floor in Huainan and Huaibei coalfields [J]. Coal Geology&Exploration, 2018, 46 (4): 142–146 (in Chinese).
 JI Zhongkui, XIA Yucheng. Study on water control in mining under safe water pressure of aquifer regarding Ordovician limestone top as working layer [J]. Coal Geology of China, 2017, 29(11): 31-34 (in Chinese).