石泉煤矿切顶卸压沿空留巷方案
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摘要
在分析切顶卸压沿空留巷技术优势的基础上,结合石泉煤矿19022工作面地质及开采技术条件,提出适用于石泉煤矿的切顶卸压沿空留巷方案:回采巷道超前加强支护选择高强度锚索配合单体液压支柱迈步抬棚;对采空区至超前支护段的巷道顶板实施预裂爆破,构成卸压时的断裂切顶线;工作面后方的沿空留巷采用贴帮丛柱+单体液压支柱抬棚+液压抬棚的形式进行补强支护。矿压监测结果表明,巷道顶板平均下沉量为95 mm,两帮平均移近量为225 mm,符合巷道断面变形要求;巷道支架平均支护阻力为33MPa,符合巷道支护强度要求。
Based on analysis of technical advantages of gob-side entry retaining by cutting roof to release pressure,combined with geological and mining technical conditions of 19022 working face of Shiquan Coal Mine,the scheme of gob-side entry retaining by cutting roof to release pressure for Shiquan Coal Mine was proposed:high-strength anchor with single hydraulic props were selected for advanced reinforcement support of mining roadway;pre-split blasting was carried out on the roof of roadway from goaf to advanced support section to form fracture top cutting line during pressure relief;reinforcement support in the back of the working face adopted the form of sluice column+single hydraulic props lifting shed+ hydraulic lifting shed.The results of mine pressure monitoring show that the average subsidence of roadway roof is 95 mm,and the average displacement of the two gangs is 225 mm,which is in line with the deformation requirements of the roadway section;the average support resistance of the roadway supports is 33 MPa,which meets the requirements of roadway support strength.
Based on analysis of technical advantages of gob-side entry retaining by cutting roof to release pressure,combined with geological and mining technical conditions of 19022 working face of Shiquan Coal Mine,the scheme of gob-side entry retaining by cutting roof to release pressure for Shiquan Coal Mine was proposed:high-strength anchor with single hydraulic props were selected for advanced reinforcement support of mining roadway;pre-split blasting was carried out on the roof of roadway from goaf to advanced support section to form fracture top cutting line during pressure relief;reinforcement support in the back of the working face adopted the form of sluice column+single hydraulic props lifting shed+ hydraulic lifting shed.The results of mine pressure monitoring show that the average subsidence of roadway roof is 95 mm,and the average displacement of the two gangs is 225 mm,which is in line with the deformation requirements of the roadway section;the average support resistance of the roadway supports is 33 MPa,which meets the requirements of roadway support strength.
引文
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[13]郑强,孙川,贺娟.锚索梁补强支护力学模型及其对支护构件工作阻力影响分析[J].山东煤炭科技,2017(2):37-40.ZHENG Qiang,SUN Chuan,HE Juan.Mechanical model of reinforced support of anchored cable and its influence on working resistance of supporting[J].Shandong Coal Science and Technology,2017(2):37-40.
[2]张东升,马立强,冯光明,等.综放巷内充填原位沿空留巷技术[J].岩石力学与工程学报,2005,24(7):1164-1168.ZHANG Dongsheng,MA Liqiang,FENG Guangming,et al.The technique of gob-side entry retaining with entry-in packing on its original position in fullymechanized coalface with top-coal caving[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(7):1164-1168.
[3]何满潮,陈上元,郭志飚,等.切顶卸压沿空留巷围岩结构控制及其工程应用[J].中国矿业大学学报,2017,46(5):959-969.HE Manchao,CHEN Shangyuan,GUO Zhibiao,et al.Control of surrounding rock structure for gob-side entry retaining by cutting roof to release pressure and its engineering application[J].Journal of China University of Mining &Technology,2017,46(5):959-969.
[4]陈勇.沿空留巷围岩结构运动稳定机理与控制研究[D].徐州:中国矿业大学,2012.
[5]陈勇,柏建彪,王襄禹,等.沿空留巷巷内支护技术研究与应用[J].煤炭学报,2012,37(6):903-910.CHEN Yong,BAI Jianbiao,WANG Xiangyu,et al.Support technology research and application inside roadway of gob-side entry retaining[J].Journal of China Coal Society,2012,37(6):903-910.
[6]王志亮.煤层深孔预裂爆破裂隙扩展机理与应用研究[D].北京:中国矿业大学(北京),2010.
[7]吴丙权.切缝药包控制爆破初始裂缝形成及应用研究[D].西安:西安科技大学,2014.
[8]伍永平,刘孔智,贠东风,等.大倾角煤层安全高效开采技术研究进展[J].煤炭学报,2014,39(8):1611-1618.WU Yongping,LIU Kongzhi,YUN Dongfeng,et al.Research progress on the safe and efficient mining technology of steeply dipping seam[J].Journal of China Coal Society,2014,39(8):1611-1618.
[9]周登辉,伍永平,解盘石.大倾角坚硬顶板深孔超前预爆破研究与应用[J].西安科技大学学报,2009,29(5):510-514.ZHOU Denghui, WU Yongping, XIE Panshi.Research and application of deep hole advance preblasting in hard roof of steeply dipping seam mining[J].Journal of Xi'an University of Science and Technology,2009,29(5):510-514.
[10]杨汉宏,薛二龙,罗文,等.神华集团切顶卸压自动成巷无煤柱开采技术的应用[J].煤炭科技,2015(3):1-3.
[11]马新根,王炯,武海龙,等.塔山煤矿回采工作面无煤柱开采切顶爆破试验研究[J].煤炭科学技术,2018,46(增刊1):27-32.MA Xingen,WANG Jiong,WU Hailong,et al.Experimental study on blasting of roof cutting with no pillar mining in working face of Tashan Coal Mine[J].Coal Science and Technology,2018,46(S1):27-32.
[12]陈鑫,韩正铜,郝敬宾,等.井下超前支护用悬浮式单体液压支柱监测系统[J].工矿自动化,2015,41(8):13-16.CHEN Xin,HAN Zhengtong,HAO Jingbin,et al.Monitoring system of suspension type single hydraulic prop for underground forepoling[J].Industry and Mine Automation,2015,41(8):13-16.
[13]郑强,孙川,贺娟.锚索梁补强支护力学模型及其对支护构件工作阻力影响分析[J].山东煤炭科技,2017(2):37-40.ZHENG Qiang,SUN Chuan,HE Juan.Mechanical model of reinforced support of anchored cable and its influence on working resistance of supporting[J].Shandong Coal Science and Technology,2017(2):37-40.