Title: Demonstration of a technical system for water disaster prevention and control when mining under sandstone aquifers

Authors: Jianghua Li; Hongjie Li; Yuguang Lian; Yaqi Luo

Addresses: Mine Safety Technology Branch of China Coal Research Institute, Beijing 100013, China; State Key Laboratory of Coal Mining and Clean Utilization, China Coal Research Institute, Beijing 100013, China; Faculty of Geoscience and Surveying Engineering, China University of Mining and Technology, Beijing 100083, China ' Mine Safety Technology Branch of China Coal Research Institute, Beijing 100013, China; State Key Laboratory of Coal Mining and Clean Utilization, China Coal Research Institute, Beijing 100013, China ' Mine Safety Technology Branch of China Coal Research Institute, Beijing 100013, China; State Key Laboratory of Coal Mining and Clean Utilization, China Coal Research Institute, Beijing 100013, China ' Faculty of Resource and Safety Engineering, China University of Mining and Technology, Beijing 100083, China

Abstract: A heterogeneous sandstone aquifer (K₈) lying above a no. 3 coal seam greatly threatens the safety of mining operations at working faces in the Zhao Coal Mine. This study demonstrated a disaster prevention approach involving the transient electromagnetic method and drainage drillings into the water-rich areas before mining, and evaluated the drainage effect. The research followed three steps: 1) three water-rich areas were identified in the sandstone aquifer K₈; 2) in the water-rich areas, three drilling sites were designed, and ten holes were drilled; 3) water outflow from the drilling holes decreased obviously over time, and the water-rich areas almost disappeared following water drainage. The total volume of drained water was more than the predicted value; hence, the approach met the requirements for water drainage. This technical system of water disaster prevention and control was proposed for circumstances of mining under roof aquifers, which included geophysical prospecting, drilling exploration, water drainage, and effect evaluation.

Keywords: sandstone aquifer; transient electromagnetic method; TEM; water-rich area; drilling exploration; drainage water; effect evaluation.

DOI: 10.1504/IJMME.2021.116887

International Journal of Mining and Mineral Engineering, 2021 Vol.12 No.2, pp.149 - 162

Accepted: 11 Apr 2021
Published online: 05 Aug 2021 *

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