穿层预裂爆破在赵固二矿单一硬煤层瓦斯抽采中的应用

发布时间：2018-04-05 03:05

本文选题：穿层深孔爆破　切入点：界面效应　出处：《煤矿安全》2016年06期

【摘要】：为解决单一坚硬突出煤层瓦斯抽采效率低、抽采达标时间长、影响生产接替等问题,在实验室对穿层预裂爆破增加坚硬煤层的裂隙贯通长度,提高煤层透气性进行了相似模拟试验。通过实验得出,对于穿层钻孔爆破,炸药在坚硬煤层中爆炸产生的裂纹较长并且贯通性强。通过分析认为,爆破应力波在坚硬煤层中传播不易被煤层吸收,当应力波传播到更加坚硬的岩层时,会产生波的反射,继续反作用于煤层促进了煤层裂隙的继续扩展,从而使煤层中的裂隙延长、贯通。最后,在赵固二矿二1煤层进行了穿层钻孔预裂爆破的现场试验,通过对爆破前后的钻孔抽采数据进行考察分析,得出爆破后的单孔平均瓦斯浓度比爆破前增加81.18%~91.79%,平均瓦斯抽采纯量增加3.50~6.07倍,取得了很好的增透效果。
[Abstract]:In order to solve the problems of low efficiency of gas extraction in single hard outburst coal seam, long time of drawing up to reach the standard, and influence on production replacement, the crack through length of hard coal seam was increased by pre-splitting blasting in laboratory.Similar simulation test was carried out to improve the permeability of coal seam.Through experiments, it is concluded that the crack caused by explosive explosion in hard coal seam is longer and has strong transfixibility for drilling blasting through layer.Through the analysis, it is concluded that the blasting stress wave propagates in the hard coal seam is not easy to be absorbed by the coal seam, when the stress wave propagates to the harder rock formation, it will produce the reflection of the wave, and continue to react to the coal seam to promote the continuous expansion of the coal seam crack.Thus, the cracks in the coal seam are prolonged and through.Finally, the field test of pre-splitting blasting of borehole in No. 2 coal seam of Zhaogu No. 2 Coal Mine was carried out, and the data of borehole extraction before and after blasting were investigated and analyzed.It is concluded that the average gas concentration in single hole after blasting is 81.18 and 91.79 higher than that before blasting, and the average scalar amount of gas drainage is 3.50 ~ 6.07 times higher than that before blasting, and a good antireflection effect is obtained.
【作者单位】：焦作煤业(集团)新乡能源有限公司;安徽理工大学煤矿安全高效开采省部共建教育部重点实验室;安徽理工大学能源与安全学院;
【基金】：国家自然科学基金资助项目(51474009)
【分类号】：TD712.6

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