亭南煤矿液态CO_2致裂巷道卸压技术的应用研究
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摘要
为了消除冲击地压给亭南煤矿带来的安全隐患,采用液态CO_2致裂技术对危险区域的煤体进行预裂爆破。通过数值模拟研究控制孔对钻孔爆破的影响及亭南煤矿爆破孔的合理间距,并采用钻屑法对爆破后的效果进行分析。研究结果表明:控制孔的存在对煤预裂爆破效果是有利的,施工控制孔之后进行煤层液态CO_2爆破的裂隙区影响范围明显大于无控制孔时的爆破的裂隙区影响范围;爆破孔的合理间距为7 m;爆破后钻屑量的测定结果均小于钻屑量的临界值,爆破后消除了煤体冲击地压的安全隐患,可以正常开采。
In order to eliminate the potential safety problems of rockburst in Tingnan coal mine,liquid CO_2 fracturing technology is adopted for pre-splitting blasting in hazardous areas. Through numerical simulation,effect of the control hole on the drilling blasting and the reasonable spacing of blasting hole in Tingnan coal mine are investigated,and the blasting performance is analyzed by the method of drilling bits. The results show that the control hole is favorable for the coal blasting,and the influence scope of crack area of the liquid CO_2 blasting with control hole is significantly larger than that without blasting hole. The reasonable spacing of blasting hole in Tingnan coal mine is 7 m;After blasting,the measured amounts of drilling and cuttings are less than the critical values. The hidden danger of rock burst in coal blocks can be eliminated through blasting to realize normal mining.
In order to eliminate the potential safety problems of rockburst in Tingnan coal mine,liquid CO_2 fracturing technology is adopted for pre-splitting blasting in hazardous areas. Through numerical simulation,effect of the control hole on the drilling blasting and the reasonable spacing of blasting hole in Tingnan coal mine are investigated,and the blasting performance is analyzed by the method of drilling bits. The results show that the control hole is favorable for the coal blasting,and the influence scope of crack area of the liquid CO_2 blasting with control hole is significantly larger than that without blasting hole. The reasonable spacing of blasting hole in Tingnan coal mine is 7 m;After blasting,the measured amounts of drilling and cuttings are less than the critical values. The hidden danger of rock burst in coal blocks can be eliminated through blasting to realize normal mining.
引文
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[2]蓝航,陈东科,毛德兵.我国煤矿深部开采现状及灾害防治分析[J].煤炭科学技术,2016,44(1):39-46.Lan Hang,Chen Dongke,Mao Debing.Current status of deep mining and disaster prevention in China[J].Coal Science and Technology,2016,44(1):39-46.
[3]向鹏.深部高应力矿床岩体开采扰动响应特征研究[D].北京:北京科技大学,2015.Xiang Peng.Study on the Characteristics of Mining Disturbance Response of Rock Mass in Deep High Stress Deposits[D].Beijing:University of Science and Technology Beijing,2015.
[4]周林生.深井综放开采沿空巷道变形破坏特征与围岩控制技术研究[D].青岛:山东科技大学,2006.Zhou Linsheng.Study on Deformation and Failure Characteristics of Entry along Goaf and the Technology of Strata Control about Fully Mechanized Sublevel Caving in Deep Mine[D].Qingdao:Shandong University of Science and Technology,2006.
[5]兰天伟.大台井冲击地压动力条件分析与防治技术研究[D].阜新:辽宁工程技术大学,2012.Lan Tianwei.Research on Dynamic Condition Analysis and Prevention Technology of Rock Burst in Datai Coal Mine[D].Fuxin:Liaoning University of Engineering and Technology,2012.
[6]朱斯陶.特厚煤层开采冲击地压机理与防治研究[D].北京:北京科技大学,2017.Zhu Sitao.Study on Mechanism and Prevention of Rock Burst in Mining of Extra-thickness Coal Seam[D].Beijing:University of Science and Technology Beijing,2017.
[7]田利军.忻州窑矿压缩型冲击地压发生机理及防治研究[D].阜新:辽宁工程技术大学,2013.Tian Lijun.Study on the Mechanism and Prevention of Compressive Rock Burst in Xinzhou Coal Mine[D].Fuxin:Liaoning Technical University,2013.
[8]谢鹏飞.济二矿上层煤采动影响下冲击地压预测与防治技术研究[D].阜新:辽宁工程技术大学,2012.Xie Pengfei.Research on Prediction and Prevention Technology of rock Burst under the Influence of Upper Coal Mining in Ji No.2Coal Mine[D].Fuxin:Liaoning Technical University,2012.李润芝,梁冰,孙维吉,等.顺层钻孔瓦斯抽采半径及布孔间
[9]距实验研究[J].中国安全科学学报,2016,10(26):133-138.Li Runzhi,Liang Bing,Sun Weiji,et al.Experimental study on both gas drainage radius and bedding boreholes space[J].China Safety Sciences Journal,2016,10(26):133-138.
[10]王红星.深部硬岩巷道侧帮钻孔爆破卸压数值模拟研究[D].西安:西安建筑科技大学,2016.Wang Hongxing.Numerical Simulation of Side-wall Blasting Pressure Relief in Deep Hard Rock Roadway[D].Xi'an:Xi'an University of Architecture and Technology,2016.
[11]王宁博.穿层钻孔周围应力变化特征及其对瓦斯抽采的影响[D].徐州:中国矿业大学,2016.Wang Ningbo.Characteristics of Stress Variation around Cross-layer Boreholes and Its Influence on Gas Extraction[D].Xuzhou:China University of Mining and Technology,2016.
[12]杨光,章光,郑业忠.新型CO2加砂无水压裂技术研究[J].现代矿业,2017(10):83-85.Yang Guang,Zhang Guang,Zheng Yezhong.New type of CO2sand fracturing without water[J].Modern Mining,2017(10):83-85.