关键词: 基岩, 裂隙水, 顶板疏放水, 物理探测, 钻探

Abstract:

In order to avoid the risk of water inburst caused by connectivity of the weathering bedrock fissure water of the Jurassic Zhiluo Formation in the working face roof of Jinjie Coal Mine, the 31302 working face was taken as the research object, and a roof water hazard prevention and control technology system integrating geophysical detection and directional drilling was constructed. First, based on the criterion of development height of water-conducting fissured zone (normal bedrock thickness <58.6 m), audio electrical penetration and radio wave perspective technology were used to identify the water-rich abnormal area of aquifers. Then, downhole television imaging technology was used to study the spatial distribution characteristics and development features of the water-conducting fissured zone. Finally, according to the detection results, 61 roof drainage boreholes (total footage of 8 652 m) were deployed to realize large-scale drainage of static reserves. The monitoring results show that the peak water inflow in the initial drainage stage is 3 032.10 m³/h, and the water inflow in the stable stage is 889 m³/h; the cumulative water discharge is 3.495 million m³, and the maximum depth reduction of the aquifer's water level is 8.58 m.

Key words: bedrock, fissure water, roof water drainage, physical detection, drilling