型煤钻孔裂隙发育的数值模拟研究
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摘要
本文利用型煤进行煤层钻孔模拟,并向钻孔内部进行注浆。浆体凝固后将型煤剥落,得到钻孔周围的裂隙发育,并运用FLAC3D数值模拟软件,对钻孔过程中,钻孔周围应力变化进行数值模拟研究,进而分析钻孔周围裂隙发育以及分布的情况。结果表明:通过钻孔周围应力变化情况的分析,可以发现在钻孔过程中钻孔周围的应力变化趋势,通常表现为"先减小,后增加"的趋势,并且钻孔周围边裂隙的数量随钻孔深入呈现"先增加,后减少"的趋势。
In this paper,the simulation of coal seam drilling is carried out with briquette and grouting is carried out in the borehole. After the slurry is solidified,the briquettes are peeled off,and the cracks around the borehole are developed. The numerical simulation of the stress changes around the borehole is carried out by the FLAC3 D numerical simulation software,and the development and distribution of the cracks around the borehole are analyzed. The results show that through the analysis of the stress changes around the borehole,it is found that the trend of stress changes around the borehole during drilling is usually shown as the trend of " decreasing first and then increasing",and the number of cracks around the borehole shows a trend of " increasing first and then decreasing" in the borehole..
In this paper,the simulation of coal seam drilling is carried out with briquette and grouting is carried out in the borehole. After the slurry is solidified,the briquettes are peeled off,and the cracks around the borehole are developed. The numerical simulation of the stress changes around the borehole is carried out by the FLAC3 D numerical simulation software,and the development and distribution of the cracks around the borehole are analyzed. The results show that through the analysis of the stress changes around the borehole,it is found that the trend of stress changes around the borehole during drilling is usually shown as the trend of " decreasing first and then increasing",and the number of cracks around the borehole shows a trend of " increasing first and then decreasing" in the borehole..
引文
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[5]曲来明.采用新材料风控提高钻孔抽放质量[J].煤炭工程,2003(8):47-49.
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[7]殷文涛,刘明举,温志辉.煤层瓦斯抽放封孔工艺研究与应用[J].煤炭工程,2011(2):31-33.
[8]黄鑫业,蒋承林.本煤层瓦斯抽采钻孔带压封孔技术研究[J].煤炭科学技术,2011,39(10):45-48.
[2]范衡.关于我国瓦斯治理现状及存在问题[J].价值工程,2014(24):30-31.
[3]成艳英,林柏泉,郝志勇,等.聚氨酯封孔材料双魂液混合均匀度CFD模拟[J].煤矿安全,2012,43(8):53-56.
[4]李季.煤矿硬质聚氨酯泡沫封孔安全性能试验研究[D].北京:中国地质大学(北京),2011.
[5]曲来明.采用新材料风控提高钻孔抽放质量[J].煤炭工程,2003(8):47-49.
[6]翟成,向贤伟,余旭,等.瓦斯抽放钻孔柔性膏体封孔材料封孔性能研究[J].中国矿业大学学报,2013,42(6):982-988.
[7]殷文涛,刘明举,温志辉.煤层瓦斯抽放封孔工艺研究与应用[J].煤炭工程,2011(2):31-33.
[8]黄鑫业,蒋承林.本煤层瓦斯抽采钻孔带压封孔技术研究[J].煤炭科学技术,2011,39(10):45-48.