Mine water inflow modes and scientific design of drainage boreholes in roof confined aquifer of coal seam

Authors

HU Weiyue, Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China; Shaanxi Key Laboratory of Prevention and Control Technology for Coal Mine Water Hazard, Xi'an 710077, ChinaFollow
JI Yadong, Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China; Shaanxi Key Laboratory of Prevention and Control Technology for Coal Mine Water Hazard, Xi'an 710077, China
HUANG Huan, Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China; Shaanxi Key Laboratory of Prevention and Control Technology for Coal Mine Water Hazard, Xi'an 710077, China

Abstract

Aiming at the uncertainty of mine water inflow mode, this paper analyzes the spatiotemporal variation characteristics of mine water inflow at first, and get a conclusion that the mine water is composed of static storage and dynamic recharge. And the static storage is mainly affected by weighting interval, the aquifer thickness of caving and fracture zone height and specific yield; the dynamic recharge is mainly affected by caving and fracture zone height and specific yield, hydraulic gradient in permeable flow field and discharge section area. According to the spatial relationships between water conducted fissure and roof aquifer of coal seam, the mine water inflow mode is classified into 3 types: partially penetrating well with water entering from well bottom, partially penetrating well with water entering from well bottom and wall, and completely penetrating well with water entering from well wall. And then the different calculation formulas of dynamic recharge for three mine water inflow modes are given based on groundwater seepage theory. For the large quantity drainage boreholes and excess quantity drainage, the optimal design concept of drainage borehole is proposed, which consists of caving and fracture zone height controlling boreholes depth, influence radius of single hole controlling borehole layout, and stable time of drainage controlling advanced drainage time, so as to optimize the layout of drainage water and drainage borehole, and establish the system of drainage of roof aquifers. The results offer an alternative for the scientific connotation of calculus formula and control methods for mine roof water inflow, which has practical guiding significance for prevention and control of mine roof water disaster.

Keywords

roof aquifer of coal seam, static storage, dynamic recharge, mine water inflow mode, drainage boreholes optimization

DOI

10.3969/j.issn.1001-1986.2021.05.015

Recommended Citation

HU Weiyue, JI Yadong, HUANG Huan, et al. (2021) "Mine water inflow modes and scientific design of drainage boreholes in roof confined aquifer of coal seam," Coal Geology & Exploration: Vol. 49: Iss. 5, Article 16.
DOI: 10.3969/j.issn.1001-1986.2021.05.015
Available at: https://cge.researchcommons.org/journal/vol49/iss5/16

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