Mechanism of water inrush driven by grouting and control measures—a case study of Chensilou mine, China

• Published in: Arabian journal of geosciences 2017-11, Vol.10 (21), p.1-10, Article 468
• Main Authors: Li, Hao, Bai, Haibo, Wu, Jianjun, Wang, Changshen, Ma, Zhanguo, Du, Yabo, Ma, Kai
• Format: Article
• Language: English
• Subjects: Aquifers; Boreholes; Case studies; Casualties; Coal; Coal mines; Coal mining; Disasters; Earth and Environmental Science; Earth science; Earth Sciences; Economic impact; Emergency preparedness; Fracture zones; Geology; Groundwater; Grouting; Hydrogeology; Limestone; Mining; Original Paper; Slurries; Water; Water flow; Water inrush
• ISSN: 1866-7511; 1866-7538
• DOI: 10.1007/s12517-017-3258-8

Water inrush into coal mines from aquifers underlying coal seams often causes serious casualties and economic losses. The key to preventing the disaster is to discover a water inrush mechanism suitable for specific geological and hydrogeological conditions and apply reasonable control measures. A case of the Chensilou mine is studied in this paper. Complex geological and hydrogeological conditions, such as 12 aquifers in the floor and small distance between coal seam and aquifer, make the mining face in the synclinal basin have a great risk of water inrush. In addition, as an important way to prevent the disaster, grouting will aggravate the risk of water inrush from the floor. The slurry will drive groundwater in the limestone aquifers L 8 , even L 7 and L 6 along the horizontal (fracture zone in L 11 ~L 8 ) and vertical (Fs1 ~Fd1) water flow channel into the mining face and synclinal basin. A new water inrush mechanism driven by grouting is formed. In order to prevent this disaster, based on statistical law of hole deviation, the relative error of vertical depth and the angle between the borehole and the rock formation are obtained. Finally, an improved grouting method is proposed, which is useful to ensure the safe production of coal mine and reduce the cost of grouting.