Abstract:
Studying the height of water conducting fractured zone is an important foundation for aquifer restoration and surface ecological protection. Clarifying the sensitivity ranking of its influencing factors is conducive to grasping the main contradictions and achieving safe and efficient prevention of mine water. In this paper, field measurement, numerical modeling and mathematical calculation methods are used to analyze the intrinsic connection between the height of water conducting fractured zone and the lithology combination, mining thickness, working face length, and burial depth. The equation for computing the height of water conducting fractured zone is obtained and applied in the field. The specific conclusion is as follows the height of water conducting fractured zone conducts faster in hard rock, while soft rock can inhibition the height of water conducting fractured zone. The height of water conducting fractured zone in the combination of soft rock and hard rock (lower soft and upper hard) is greater than that in the combination of hard rock and soft rock (lower hard and upper soft). The mining method will affect the height of water conducting fractured zone, and the height of water conducting fractured zone in fully mechanized mining is greater than that in thick coal seam layered mining, single thin coal seam mining, and single medium thick coal seam mining. Ranking of sensitivity of various factors to the height of water conducting fractured zone: mining thickness>hard rock lithology ratio coefficient>mining depth>working face length. Compared with the empirical formula of the three regulations, using multi-factor fitting equation can better predict the height of water conducting fractured zone in the 12403 working face of Wulanmulun Coal Mine, with an error of only −2.54%. The research results provide guidance for groundwater resource protection and water hazard treatment.