Research on roof water drainage of bedrock fissure water working face

doi:10.16265/j.cnki.issn1003-3033.2025.S1.0019

Abstract

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

CLC Number:

X936

DONG Huadong, QIAO Long, LIU Jiwei, XU Jie, LEI Kaichun. Research on roof water drainage of bedrock fissure water working face[J]. China Safety Science Journal, 2025, 35(S1): 122-129.

Figures/Tables 9

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涌水量Q/(m³·h^-1)	涌水等级
≤180	小
(180,600]	中等
(600,2 100]	大
>2 100	很大

富水系数K_β/(m³·t^-1)	充水强度
<2	弱
(2,5]	中等
(5,10]	强
>10	极强

孔号	裂隙顶界深度/m	裂隙带高度/m	垮落带顶界深度/m	垮落带高度/m
CH01	100.20	56.90	150.80	8.20
CH03	112.00	47.00	139 m处,遇阻	—
CH04	102.48	54.52	147.61	9.39
CH05	88.58	55.42	遇阻	—
CH07	101.08	43.92	遇阻	—
最大值	—	56.90	—	9.39

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