王坡煤矿本煤层预抽钻孔布置方式优化研究与效果考察
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摘要
为解决本煤层透气性差和预抽效果不理想问题,基于弹塑性力学理论,分析钻孔周围应力和塑性区分布及其影响因素,得到钻孔交叉布置并增加两钻孔交叉点数量,可增大钻孔网的孔周塑性区体积,增加抽采钻孔的有效长度,增加预抽煤层透气性,提高瓦斯抽采效率。通过王坡煤矿3207试验工作面分区域布置3种本煤层预抽方案及抽采效果考察,3种预抽钻孔布置方式中立体交叉钻孔抽采效率最高、衰减系数最小,是最佳本煤层预抽钻孔布置方式,后续推广应用中,有效解决现场抽-掘-采衔接紧张问题。
In order to solve the problem of poor permeability and pre-pumping effect in mining-coal bed, based on the theory of elastoplastic, the distribution of stress and plastic zone around the borehole and its influencing factors are analyzed, through the cross arrangement of drilling and increasing the number of two crossing points, it can increase the volume of the plastic zone around the borehole network, increase the effective length of the extraction borehole, increase the permeability of pre-extraction coal seam, and improve the efficiency of gas extraction. Three kinds of pre-extraction schemes and extraction effects of mining-coal bed are arranged in different regions at 3207 test working face of Wangpo Coal Mine. Among the three pre-extraction drilling arrangements, three-dimensional cross-drilling has the highest extraction efficiency and the smallest attenuation coefficient, which is the optimal arrangement of pre-extraction drilling in mining-coal bed. In the subsequent promotion and application, the tension between on-site extraction, excavation and mining can be effectively solved.
In order to solve the problem of poor permeability and pre-pumping effect in mining-coal bed, based on the theory of elastoplastic, the distribution of stress and plastic zone around the borehole and its influencing factors are analyzed, through the cross arrangement of drilling and increasing the number of two crossing points, it can increase the volume of the plastic zone around the borehole network, increase the effective length of the extraction borehole, increase the permeability of pre-extraction coal seam, and improve the efficiency of gas extraction. Three kinds of pre-extraction schemes and extraction effects of mining-coal bed are arranged in different regions at 3207 test working face of Wangpo Coal Mine. Among the three pre-extraction drilling arrangements, three-dimensional cross-drilling has the highest extraction efficiency and the smallest attenuation coefficient, which is the optimal arrangement of pre-extraction drilling in mining-coal bed. In the subsequent promotion and application, the tension between on-site extraction, excavation and mining can be effectively solved.
引文
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[13]张增辉,陈殿赋,黄步青,等.保德煤矿煤层瓦斯合理预抽期及钻孔布置方式的研究[J].矿业安全与环保,2012,39(2):41-44.
[14]谢雄刚,李希建,余照阳.顺层钻孔预抽突出煤层瓦斯技术研究[J].煤炭科学技术,2013,41(1):78-81.
[15]陈开岩,张占国,林柏泉,等.综放工作面抽放条件下瓦斯涌出及分布特征[J].采矿与安全工程学报,2009,26(4):418-422.
[16]武文浩.矿井瓦斯强化抽采体系在马兰煤矿的应用[J].煤炭科学技术,2014,42(4):117-119.
[2]张广云.区域密集钻孔抽采技术在高瓦斯矿井煤巷掘进中的应用[J].煤矿开采,2011,16(6):100-101.
[3]王永安.网状本煤层钻孔瓦斯预抽放技术在屯兰矿的应用[J].山西大同大学学报(自然科学版),2008,24(6):53-55.
[4]马念杰,郭晓菲,赵希栋,等.煤与瓦斯共采钻孔增透半径理论分析与应用[J].煤炭学报,2016,41(1):120-127.
[5]马念杰,李季,赵志强.圆形巷道围岩偏应力场及塑性区分布规律研究[J].中国矿业大学学报,2015,44(2):206-213.
[6]钱鸣高,石平五.矿山压力与岩层控制[M].徐州:中国矿业大学出版社,2003:58.
[7]薛彦平.低透气性煤层交叉钻孔预抽试验研究[J].煤炭技术,2017,36(5):191-193.
[8]谢雄刚,李希建,余照阳.顺层钻孔预抽突出煤层瓦斯技术研究[J].煤炭科学技术,2013,41(1):78-81.
[9]王京生,贾泉敏,刘丰韬,等.本煤层瓦斯预抽采工艺改进研究[J].现代矿业,2013,529(5):105-106.
[10]孙英峰,孙晓兀,曹家琳,等.本煤层瓦斯抽放交叉钻孔塑性区分布规律[J].煤矿安全,2014,45(10):4-6.
[11]孙福龙,富向,张传喜.寺家庄煤矿突出煤层掘进工作面瓦斯治理实践[J].煤矿安全,2014,45(6):118.
[12]张颐纯,邢玉忠.低透气性煤层交叉钻孔预抽瓦斯合理孔距研究[J].中国煤炭,2016,42(8):109-112.
[13]张增辉,陈殿赋,黄步青,等.保德煤矿煤层瓦斯合理预抽期及钻孔布置方式的研究[J].矿业安全与环保,2012,39(2):41-44.
[14]谢雄刚,李希建,余照阳.顺层钻孔预抽突出煤层瓦斯技术研究[J].煤炭科学技术,2013,41(1):78-81.
[15]陈开岩,张占国,林柏泉,等.综放工作面抽放条件下瓦斯涌出及分布特征[J].采矿与安全工程学报,2009,26(4):418-422.
[16]武文浩.矿井瓦斯强化抽采体系在马兰煤矿的应用[J].煤炭科学技术,2014,42(4):117-119.