Abstract
Gas drainage effect is the utmost important factor for mining speed and mining safety. It has great meaning to study the effect of gas drainage. Comparative experiment of gas drainage in different types of drillings shows that the initial rate of gas natural emission by hydraulic loosed cross drilling is 1.5 times more than that of parallel drilling, and the drilling gas attenuation coefficients reduces to 0.78 times, the effect of gas drainage is good. The ultimate quantity of gas drainage of parallel drilling, cross drilling, hydraulic loosed cross drilling are 859.1, 1 323.5 and 1 833.6 m3/100 m. The results of the measurement through these three kinds of drillings of 100 meters drilling is considered as following: cross drilling is 1.54 times more than that of parallel drillings, hydraulic loosed cross drilling are 2.13 times more than parallel drilling. The drainage rate of parallel drilling, cross drilling and hydraulic loosed cross drilling reached 10% to 15% in 3 months with the pre-draining time. Among these, the drainage effect of hydraulic loosed cross drilling increased by 46% than that of parallel drilling in three months.
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