Abstract
According to the practical engineering in Daxing Coal Mine north limb centralized down transportation, the No 13 coal seam rock cross-cut area with high gas pressure and content was serious outburst hazardof. Based on the technical principle and protection outburst mechanism of hydraulic in depressurization and enhanced permeability, the hydraulic drills in rock cross-cut coal uncovering were desinged, and the hydraulic equipment was matched, the measures were constructed, the effect was tested. The results show that the new type integration technology of the integrative hydraulic drilling and reaming obvious increased the plasticity of coal, reduced the stress concentration region of coal seam, improved the permeability of coal, promoted gas release, enhanced the ability of preventing coal and gas breakout, which played an active role in comprehensive outburst controlling, obtain ed a favourable effect in rock cross-cut coal uncovering and has important popularized and applied values.
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