1. Mining College,Guizhou University,Guiyang　 550025,China;2. Key Laboratory of Comprehensive Utilization of Non-metallic Mineral Resources in Guizhou Province,Guizhou University,Guiyang　 550025,China;3 Mining Products Safety Approval and Certification Center,Beijing　 100042,China

通过实测某矿井1235运输巷M3突出煤层的静态膨胀开裂效果,获得了抽放孔内壁静态膨胀力及膨胀开裂裂隙内窥图,现场验证了静态膨胀开裂突出煤层的可行性。现场实测得出:随着膨胀孔内静态膨胀剂水化反应发展,临近膨胀孔的抽放孔内壁产生逐步增大的静态膨胀力并达到峰值,随后静态膨胀力逐步减小并最终消失;同一钻孔直径测试方案中,方案Ⅰ产生静态膨胀力的峰值最大,三种不同钻孔直径测试方案中,Ф94 mm膨胀孔产生的静态膨胀力峰值最大;本次测试条件下,合理的孔间距与钻孔直径比值μ=14~15;相同的μ值测试方案中,随着钻孔直径增大,抽放孔内壁膨胀开裂效果呈明显上升趋势。

By testing the expanding and cracking effect of the M3 outburst coal seam in the No. 1235 haulage roadway in a coal mine,the static expansion forces and the endoscopic figures of the internal face of the drainage holes were ob- tained,and the feasibility was further verified by the static expanding and cracking the outburst coal seam. The site test shows that:① With the development of the hydration reaction of the static expansion agent in the expansion holes,the internal faces of the drainage hole near the expansion holes produce the static expansion force with gradual increase until to the peak value,which then decrease gradually until to disappear;② In the test scheme with the same hole di- ameter,the scheme I produces the static expansion force with the maximum value among the test schemes with three different hole diameters,and the expansion holes with a diameter 94 mm cause the most peak value of the static expan- sion force;③ Under the test condition,the reasonable ratioμbetween hole spacing and hole diameter is about 14-15; ④ In the different schemes with the sameμ,the expanding and cracking effect of the internal faces of the drainage holes are in an obvious increase trend with the hole diameters increase.

国家自然科学基金资助项目(51264004)；贵州省科技厅工业攻关项目(黔科合GY[2012]3054)；贵州省科技厅社发攻关项目(黔科合SY字(2015)3001)；

Xie Xionggang,Liu jinwei,Wang Lei,et al. Testing study of expanding and cracking outburst coal seam by the static expansion agent[J]. Journal of China Coal Society,2016,41(10):2620-2625.