Test Study on Effective Extraction Radius of Hydraulic Flushing Holes
WANG Feng
TAO Yunqi
JI Kai
Abstract：In order to study the relationship between the effective extraction radius of the hydraulic flushing holes and the amount of flushed coal and extraction time, in this paper,field test study was carried out by using the method of coal-seam gas content, investigation and analysis were conducted through the statistacs of the amount of flushed coal and the gathering of gas extraction data,and finally,the effective extraction radius of the hydraulic flushing holes with different amount of flushed coal and different extraction time in Zhongmacun Mine was obtained. The research results showed that the effective extraction radius of the hydraulic flushing holes increased with the increase of the amount of flushed coal and the the extraction time, but the growth rate gradually attenuated, based on its growth rule, the best amount of flushed coal of 1. 0 t/m to 2. 0 t/m, the optimum extraction time of 90 d and the corresponding effective extraction radius of 3. 50 m to 3. 73 m in Zhongmacun Mine were obtained, and through the investigation on the pressure relief range, it was obtained that the full pressure relief range of the hydraulic flushing holes was 1. 5 m, which proved the rationality of the investigation results of the effective extraction radius of hydraulic flushing holes. This research method has strong applicability, and can provide technical support for the coal mines with different geological conditions.
Keywords：hydraulic flushing in holeeffective extraction radiusgas drainageamount of flushed coalpressure relief range
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 49-53 )