大倾角煤层大采高工作面倾角对煤壁片帮的影响机制
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摘要
以新疆焦煤集团2130煤矿大倾角大采高工作面为工程背景,采用现场监测、理论分析与数值计算等综合方法,分析了煤壁片帮的主控参量,建立了倾向煤壁岩梁力学模型,揭示了工作面倾角对煤壁片帮的影响机制,研究表明:工作面倾角、采高、推进速度、支架阻力、煤体内聚力及内摩擦角等是大倾角大采高工作面煤壁片帮的主控参量,受工作面倾角影响,煤壁支承压力沿倾向非对称分布,导致煤壁变形(挠度)呈现出非对称特性,在工作面中上部区域(约0.66L处)煤壁岩梁变形最大,随工作面倾角增大,煤壁处垂直应力值不断增加,工作面上部区域煤壁向采空区方向水平位移不断增大,且向倾斜上部转移,煤壁片帮概率增加,易发生片帮区域面积增大。
Comprehensive methods including field test, theoretical analysis and numerical simulation were adopted to analyze main control parameters for coal wall spalling of working face with great mining height in 2130 coal mine of Xinjiang coking coal group. The mechanical model of coal wall along tendency was established. Meanwhile, the mechanism of effect of working-face dip angle on coal wall spalling was revealed. Results show that main control parameters for coal wall spalling of working face with great mining height in steeply inclined seam include dip angle, mining height, advancing speed,support resistance, cohesion and internal friction angle of coal mass. Affected by dip angle of working face, the abutment pressure in coal wall is asymmetric along inclination, which leads to asymmetry of coal wall deformation. The largest deformation occurs at location of about 0.66 L in upper area of working face. With the increase in dip angle, vertical stress in coal wall increases gradually. The horizontal displacement of coal wall in upper area of working face continuously increases towards the goaf, and moves to inclined upper area. This could increase the coal spalling probability and potential areas.
Comprehensive methods including field test, theoretical analysis and numerical simulation were adopted to analyze main control parameters for coal wall spalling of working face with great mining height in 2130 coal mine of Xinjiang coking coal group. The mechanical model of coal wall along tendency was established. Meanwhile, the mechanism of effect of working-face dip angle on coal wall spalling was revealed. Results show that main control parameters for coal wall spalling of working face with great mining height in steeply inclined seam include dip angle, mining height, advancing speed,support resistance, cohesion and internal friction angle of coal mass. Affected by dip angle of working face, the abutment pressure in coal wall is asymmetric along inclination, which leads to asymmetry of coal wall deformation. The largest deformation occurs at location of about 0.66 L in upper area of working face. With the increase in dip angle, vertical stress in coal wall increases gradually. The horizontal displacement of coal wall in upper area of working face continuously increases towards the goaf, and moves to inclined upper area. This could increase the coal spalling probability and potential areas.
引文
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[16]殷帅峰,何富连,程根银.大采高综放面煤壁片帮判定准则及安全评价系统研究[J].中国矿业大学学报,2015,44(5):800-807.YIN Shuaifeng,HE Fulian,CHENG Genyin.Study of criterions and safety evaluation of rib spalling in fully mechanized top-coal caving face with large mining height[J].Journal of China University of Mining&Technology,2015,44(5):800-807.
[17]蔡美峰,何满朝,刘东燕.岩石力学与工程[M].北京:科学出版社,2002:96-98.
[18]王红伟,伍永平,解盘石,等.大倾角采场矸石充填量化特征及覆岩运动机制[J].中国矿业大学学报,2016,45(5):886-892.
[19]WANG Hongwei,WU Yongping,XIE Panshi,et al.The quantitative filling characteristics of the waste rock and roof movement mechanism in the steeply inclined working face[J].Journal of China University of Mining&Technology,2016,45(5):886-892.
[2]杨培举,刘长友,吴锋锋.厚煤层大采高采场煤壁的破坏规律与失稳机理[J].中国矿业大学学报,2012,41(3):371-377.YANG Peiju,LIU Changyou,WU Fengfeng.Breakage and falling of a high coal wall in a thick mined seam[J].Journal of China University of Mining&Technology,2012,41(3):371-377.
[3]尹希文,闫少宏,安宇.大采高综采面煤壁片帮特征分析与应用[J].采矿与安全工程学报,2008,25(2):222-225.YIN Xiwen,YAN Shaohong,An Yu.Characters of the rib spalling in fully mechanized caving face with great mining height[J].Journal of Mining&Safety Engineering,2008,25(2):222-225.
[4]杨敬轩,刘长友,吴锋锋,等.煤层硬夹矸对大采高工作面煤壁稳定性影响机理研究[J].采矿与安全工程学报,2013,30(6):856-862.YANG Jingxuan,LIU Changyou,Wu Fengfeng,et al.The research on the coal wall stability mechanism in larger height coal seam with a stratum of gangue[J].Journal of Mining&Safety Engineering,2013,30(6):856-862.
[5]李建胜,杨永康,康天合,等.采场煤壁失稳机理及控制技术研究[J].太原理工大学学报,2012,43(6):703-705.LI Jiansheng,YANG Yongkang,KANG Tianhe,et al.Study on instability mechanism and controlling technology of coal wall[J].Journal of Taiyuan University of Technology,2012,43(6):703-705.
[6]方新秋,何杰,李海朝.软煤综放面煤壁片帮机理及防治研究[J].中国矿业大学学报,2009,38(5):640-644.FANG Xinqiu,HE Jie,LI Haichao.A study of the rib fall mechanism in soft coal and its control at a fully mechanized top coal caving face[J].Journal of China University of Mining&Technology,2009,38(5):640-644.
[7]王家臣,杨印朝,孔德中,等.含夹矸厚煤层大采高仰采煤壁破坏机理与注浆加固技术[J].采矿与安全工程学报,2014,31(6):831-837.WANG Jiachen,YANG Yinchao,KONG Dezhong,et al.Failure mechanism and grouting reinforcement technique of large mining height coal wall in thick coal seam with dirt band during topple mining[J].Journal of Mining&Safety Engineering,2014,31(6):831-837.
[8]王家臣,王兆会,孔德中.硬煤工作面煤壁破坏与防治机理[J].煤炭学报,2015,40(10):2243-2250.WANG Jiachen,WANG Zhaohui,KONG Dezhong.Failure and prevention mechanism of coal wall in hard coal seam[J].Journal of China Coal Society,2015,40(10):2243-2250.
[9]杨胜利,孔德中.大采高煤壁片帮防治柔性加固机理与应用[J].煤炭学报,2015,40(6):1361-1367.YANG Shengli,KONG Dezhong.Flexible reinforcement mechanism and its application in the control of spalling at large mining height coal face[J].Journal of China Coal Society,2015,40(6):1361-1367.
[10]孔德中,杨胜利,高林,等.基于煤壁稳定性控制的大采高工作面支架工作阻力确定[J].煤炭学报,2017,42(3):590-596.KONG Dezhong,YANG Shengli,GAO Lin,et al.Determination of support capacity based on coal face stability control[J].Journal of China Coal Society,2017,42(3):590-596.
[11]杨胜利,孔德中,杨敬虎,等.综放仰斜开采煤壁稳定性及注浆加固技术[J].采矿与安全工程学报,2015,32(5):827-833.YANG Shengli,KONG Dezhong,YANG Jinghu,et al.Coal wall stability and grouting reinforcement technique in fully mechanized caving face during topple mining[J].Journal of Mining&Safety Engineering,2015,32(5):827-833.
[12]袁永,屠世浩,马小涛,等.“三软”大采高综采面煤壁稳定性及其控制研究[J].采矿与安全工程学报,2012,29(1):21-25.YUAN Yong,TU Shihao,MA Xiaotao,et al.Coal wall stability of fully mechanized working face with great mining height in“three soft”coal seam and its control technology[J].Journal of Mining&Safety Engineering,2012,29(1):21-25.
[13]伍永平,郎丁,解盘石.大倾角软煤综放工作面煤壁片帮机理及致灾机制[J].煤炭学报,2016,41(8):1878-1884.WU Yongping,LANG Ding,XIE Panshi.Mechanism of disaster due to rib spalling at fully-mechanized top coal caving face in soft steeply dipping seam[J].Journal of China Coal Society,2016,41(8):1878-1884.
[14]常聚才,谢广祥,张学会.特厚煤层大采高综放工作面煤壁片帮机制分析[J].岩土力学,2015,36(3):803-808.CHANG Jucai,XIE Guangxiang,ZHANG Xuehui.Analysis of rib spalling mechanism of fully-mechanized top-coal caving face with great mining height in extra-thick coal seam[J].Rock and Soil Mechanics,2015,36(3):803-808.
[15]黄庆享,刘建浩.浅埋大采高工作面煤壁片帮的柱条模型分析[J].采矿与安全工程学报,2015,32(2):187-191.HUANG Qingxiang,LIU Jianhao.Vertical slice model for coal wall spalling of large mining height longwall face in shallow seam[J].Journal of Mining&Safety Engineering,2015,32(2):187-191.
[16]殷帅峰,何富连,程根银.大采高综放面煤壁片帮判定准则及安全评价系统研究[J].中国矿业大学学报,2015,44(5):800-807.YIN Shuaifeng,HE Fulian,CHENG Genyin.Study of criterions and safety evaluation of rib spalling in fully mechanized top-coal caving face with large mining height[J].Journal of China University of Mining&Technology,2015,44(5):800-807.
[17]蔡美峰,何满朝,刘东燕.岩石力学与工程[M].北京:科学出版社,2002:96-98.
[18]王红伟,伍永平,解盘石,等.大倾角采场矸石充填量化特征及覆岩运动机制[J].中国矿业大学学报,2016,45(5):886-892.
[19]WANG Hongwei,WU Yongping,XIE Panshi,et al.The quantitative filling characteristics of the waste rock and roof movement mechanism in the steeply inclined working face[J].Journal of China University of Mining&Technology,2016,45(5):886-892.
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