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为确定二氧化碳爆破增加煤层瓦斯透气性技术的最佳爆破孔间距及控制孔的布置方式,采用FLAC~(3D)和Comsol软件对不同间距多空爆破和爆破影响半径进行数值模拟.研究结果表明:爆破器间距约为5 m、爆破孔间距约为7 m,且控制孔布置在相邻爆破孔中间时,液态二氧化碳多孔连续爆破能够达到最理想的爆破增透效果,而且控制孔的半径越大,增透效果越明显,瓦斯抽采效率越高.
In order to determine the optimal blast hole spacing and the layout of control holes for increasing the gas permeability of coal seam gas through CO2 blasting, the numerical simulation of the space-time blasting and the blasting radius with FLAC ~ (3D) and Comsol software was carried out.The results show that: When the distance between blasting devices is about 5 m and the spacing of blasting holes is about 7 m, and the control holes are arranged in the middle of the adjacent blasting holes, the liquid carbon dioxide continuous blasting can achieve the most ideal blasting and penetration enhancing effect, and the larger the control hole radius , The more obvious anti-dumping effect, the higher gas extraction efficiency.