Abstract:
The 113203 working face of Guizhou Songhe Coal Industry Development Co.,Ltd.is in the interlayer of basalt group coal measures in Emei Mountain.Coal seam sealing index is high with high gas pressure, high gas content and strong adsorption, and there are 1~2 local layers with 100~200 mm coal gangue.The key technology of gas control in coal measures interlayer mining of Emeishan basalt group is put forward.The four-in-one comprehensive grid anti-outburst measures of “bedding as the main+through the layer as the auxiliary+permeability-increased enhancement+local supplement” are adopted to control the mining area.The results show that: after the implementation of this technology, the production of tunnel drilling in 113203 transportation lane is increased by 87%;During the mining period, the maximum k
1 value was 0.28 mL/g·min
1/2,which was effectively reduced by 66.7%.The average monthly recovery is 70 m, and the recovery efficiency is increased by 65.74%.The maximum concentration of gas in the working face during mining is 0.42%,and the goal of “zero overlimit and zero warning” is achieved during mining to ensure safe mining.