E3S Web Conf.
Volume 261, 20212021 7th International Conference on Energy Materials and Environment Engineering (ICEMEE 2021)
|Number of page(s)||5|
|Section||Environmental Engineering Planning and Urban Facilities Construction|
|Published online||21 May 2021|
Exploration and application of directional long boreholes in coal measure strata
Xi’an Research Institute of China Coal Technology and Engineering Group Corp, Xi’an ; China
2 China Coal Research Institute, Beijing ; China
* Corresponding author: email@example.com
two roadways in adjacent working face of Baode Mine may have the risk of water inrush at the same time, so it is necessary to construct long borehole to cover the roadway excavation. On the basis of the hydrogeological conditions of the mine, the safe water insulation thickness and water inrush coefficient of coal seam No .8 are calculated. The results show that the water inrush coefficient is 0.035-0.037 MPa/m, which is less than the critical value 0.06 MPa/m and the bottom plate has no sudden water hazard. In the construction of No .10 coal seam, the directional long borehole is used to detect whether there is a hidden structure communicating with the floor limestone and to drain water. The test shows that there is no effluent phenomenon in the borehole, which proves that there is no hidden structure in No .10 coal seam.
© The Authors, published by EDP Sciences, 2021
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