基于高压水射流割缝层内卸压增透技术,运用ANSYS软件建立模型,模拟了高压水射流割缝后不同割缝宽度条件下煤体位移、应力的变化,根据模拟结果分析了割缝煤体受扰动影响的变化规律;同时在平煤集团十三矿进行了现场的试验和应用,并对割缝钻孔和普通钻孔进行了单孔抽采流量考察。ANSYS模拟研究表明,割缝宽度不同造成周围煤体位移和应力显著变化,割缝宽度增大煤体受扰动影响范围增大,加大了煤体裂隙扩展,提高了割缝煤体的卸压效果;经现场试验和应用,煤体进行高压水射流割缝后,割缝钻孔起始瓦斯抽采量是普通钻孔的2.5倍,且在考察时间内割缝孔的抽采流量远大于普通孔,提高了瓦斯抽采效率。

Based on the pressure releasing and permeability improved technology with seam slot cutting by high pressurized water jet, the ANSYS software was ap plied to the establishment of the model to simulate the variation of the seam displacement and stress under the different slot cutting width after the slot cutting by the hi gh pressurized water jet.According to the simulation results, the variation law of the disturbance influence from the seam slot cutting.Meanwhile, the site trial and applic ation of the technology was conducted in No.13 Mine of Pingdingshan Coal Mining Group and a investigation on a single borehole gas drainage and gas flow was condu cted with the slot cuting borehole and conventional borehole.The ANSYS simulation research showed that the slot cutting width difference would cause obvious variatio n of the displacement and stress around the seam.The increased slot cutting width would increase the disturbance influence scope of the seam, increase the cracking e xpansion of the seam and improve pressure releasing effect of the slot cutting seam.With the site test and application of the method, after the slot cutting in the seam C onducted with the high pressurized water jet, the gas drainage value with the slot cutting borehole would be 2.5 times higher than the conventional borehole.During the investigation period, the gas drainage and flow value with the slot cutting borehole was much higher than the conventional borehole and the gas drainage efficiency was highly improved.

国家重点基础研究发展计划(973计划)资助项目(2011CB201205)；中国矿业大学煤炭资源与安全开采国家重点实验室自主研究基金资助项目(SKLCRSM08X03)；