Development characteristics of water conduction fracture zone in deep coal seam mining in Ordos Basin

Abstract

Most coal mines in Ordos Basin are mainly Jurassic coal seams. The mining conditions are characterized by large mining height and depth. The roof aquifer is numerous and poses a serious threat to mine safety. It is particularly important to study the height of the water-conducting fracture zone of the roof over Jurassic coal seam. Taking a mine in Ordos Basin as an example, through theoretical calculation, numerical simulation, and similar analogy methods, the development height and fracture-mining ratio of the water conducting fracture zone on the roof of the goaf are predicted and analyzed. The results show that the fracture-mining ratio is 22.07 and the development height of the water-conducting fracture zone is about 154.48 m. The fitting formula obtained by analogy predicts that the height of the water-conducting fracture zone of the mine is close to the theoretical calculation value.

Keywords

• deep buried coal seam
• thick coal seam
• water-conducting fractured zone
• key strata theory
• numerical simulation