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时间:2019-02-26
《_新型瓦斯抽采钻孔注浆封孔方法及封堵机理.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第40卷第3期煤炭学报Vol.40No.32015年3月JOURNALOFCHINACOALSOCIETYMar.2015王振锋,周英,孙玉宁,等.新型瓦斯抽采钻孔注浆封孔方法及封堵机理[J].煤炭学报,2015,40(3):588-595.doi:10.13225/j.cnki.jccs.2014.0316WangZhenfeng,ZhouYing,SunYuning,etal.Novelgasextractionboreholegroutingsealingmethodandsealingmechanism[
2、J].JournalofChinaCoalSociety,2015,40(3):588-595.doi:10.13225/j.cnki.jccs.2014.0316新型瓦斯抽采钻孔注浆封孔方法及封堵机理王振锋,周英,孙玉宁,王永龙(河南理工大学能源科学与工程学院,河南焦作454000)摘要:为研究封孔支护力对钻孔漏气量的影响,提出主动支护式注浆封孔原理并进行理论分析,得出了漏气圈截面积与漏气量的求解方程,并对影响漏气量的因素进行了分析。结果表明,漏气量随着封孔支护力和封孔段长度的增加而减小。提高钻孔的主动支护力并
3、选择合适的封孔段长度可以减少钻孔漏气,提高抽采钻孔瓦斯体积分数和抽采纯量。据此设计了新型的注浆封孔装置,封孔初期,利用复合囊袋和注浆压力给钻孔壁施加1MPa左右的支护力,水泥浆液可以充分填充钻孔周围的裂隙,有效阻止裂隙漏气。后期注浆材料凝固膨胀,再次对钻孔壁形成较大的支护力,又可有效预防封孔段收缩变形形成新的漏气通道,起到减小钻孔漏气量的作用。工程实践表明,与聚氨酯封孔方法相比,同等条件下,新型注浆封孔方法钻孔瓦斯体积分数提高162.2%,钻孔的瓦斯抽采纯量提高33.83%。关键词:瓦斯抽采;注浆封孔;钻孔漏气量
4、;主动支护;瓦斯体积分数中图分类号:TD712.6文献标志码:A文章编号:0253-9993(2015)03-0588-08NovelgasextractionboreholegroutingsealingmethodandsealingmechanismWANGZhen-feng,ZHOUYing,SUNYu-ning,WANGYong-long(SchoolofEnergyScienceandEngineering,HenanPolytechnicUniversity,Jiaozuo454000,China)
5、Abstract:Inordertostudytheimpactofsealingsupportforceonairleakage,anactivesupportgroutingsealingtheo-reticalprinciplewasproposedandanalyzed,thenacirclecross-sectionalareaandtheleakageamountsolvingequa-tionswasobtained,andtheimpactfactorsonleakageamountwereals
6、oanalyzed.Researchresultsshowthattheleak-ageamountdecreaseswiththeincreaseofsupportingforceandthesealinglength.Toimprovetheinitialsupportingpower,selecttheappropriatesealinglengthcanreduceleakageamount,andimprovegasextractionconcentrationandscalar.Anovelgrout
7、ingsealingdevicewasdesignedinthisstudy.Duringthefirstperiod,thecompositepouchandgroutingpressurewereappliedtotheboreholewallwithasupportingforceofabout1MPa,thecementslurrycanfullyfillthecracksaroundthesealingsectionoftheborehole,andeffectivelypreventcrackslea
8、kage.Later,thegroutingma-terialbecomeshardandexpandedtoformalargesupportingforceontheboreholewall,preventsthecontractionofthesealingsectiondeformtoformanewleakchannel,andreducestheborehol
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