贺西煤矿三采区运输巷扩刷变形分析与控制
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摘要
基于扩刷施工后大断面巷道围岩控制难题,以贺西煤矿4#煤层三采区运输巷扩刷施工为研究背景,理论分析了扩刷后大断面巷道围岩控制难点,采用FLAC3D软件模拟了运输巷扩刷前后围岩铅直应力与塑性区的分布与演化特征。结果显示:扩刷后巷道围岩铅直应力集中区及塑性区分布范围明显增大,巷道浅部围岩存在3.5m厚连续均匀分布的"塑性环"。据此,提出锚杆索+注浆+U型钢棚等联合支护技术,锚杆支护后在巷道浅部围岩形成厚度为1.6m的预应力拱形承载结构。试验表明:巷道顶底板与两帮最大移近量分别为218mm和165mm,扩刷后巷道围岩变形得到了有效控制。
Based on the control problems of surrounding rock of large-section roadway after the expansion,the expansion and construction of the haulage roadway in the third mining district of the No.4 coal seam of Hexi coal mine is taken as the research background.The difficulty in controlling the surrounding rock of the large-section roadway after the expansion is theoretically analyzed.The distribution and evolution characteristics of vertical stress and plastic zone of surrounding rock before and after the expansion of haulage roadway are simulated by FLAC3 Dsoftware.The results show that the distribution range of the vertical stress concentration zone and the plastic zone of the roadway after the expansion are obviously increased.There is a continuous and evenly distributed plastic ring of the thickness of 3.5 min the surrounding rock of shallow roadway.Accordingly,the joint support technology of anchor cable+grouting+U-shaped steel shed is proposed.After the support of bolt,aprestressed arch-shaped bearing structure with a thickness of 1.6 mis formed in the surrounding rock of the shallow roadway.The tests show that the maximum displacement of the top and bottom of the roadway is 218 mm,while two gangs is 165 mm,and the deformation of the roadway after the expansion is effectively controlled.
Based on the control problems of surrounding rock of large-section roadway after the expansion,the expansion and construction of the haulage roadway in the third mining district of the No.4 coal seam of Hexi coal mine is taken as the research background.The difficulty in controlling the surrounding rock of the large-section roadway after the expansion is theoretically analyzed.The distribution and evolution characteristics of vertical stress and plastic zone of surrounding rock before and after the expansion of haulage roadway are simulated by FLAC3 Dsoftware.The results show that the distribution range of the vertical stress concentration zone and the plastic zone of the roadway after the expansion are obviously increased.There is a continuous and evenly distributed plastic ring of the thickness of 3.5 min the surrounding rock of shallow roadway.Accordingly,the joint support technology of anchor cable+grouting+U-shaped steel shed is proposed.After the support of bolt,aprestressed arch-shaped bearing structure with a thickness of 1.6 mis formed in the surrounding rock of the shallow roadway.The tests show that the maximum displacement of the top and bottom of the roadway is 218 mm,while two gangs is 165 mm,and the deformation of the roadway after the expansion is effectively controlled.
引文
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[3]乔卫国,宋伟杰,林登阁,等.深部高应力巷道围岩力学特征及稳定性控制技术[J].中国矿业,2015,24(8):92-95,100.QIAO Weiguo,SONG Weijie,LIN Dengge,et al.Mechanical characteristics and stability control technology of deep roadway under high stress[J].China Mining Magazine,2015,24(8):92-95,100.
[4]吴爱祥,胡凯建,黄明清,等.软弱破碎围岩运输巷道变形机理及修复支护[J].中南大学学报:自然科学版,2017,48(8):2162-2168.WU Aixiang,HU Kaijian,HUANG Mingqing,et al.Deformation mechanism and repair support of haulage roadway with weak-fractured surrounding rock[J].Journal of Central South University:Science and Technology,2017,48(8):2162-2168.
[5]黎劲东,吕兆海,赵长红.软弱膨胀性岩层巷道变形分析及修复技术研究[J].中国煤炭,2018,44(8):77-81,126.LI Jindong,LYU Zhaohai,ZHAO Changhong.Study on the deformation analysis and repair technology of weak expansive rock roadway[J].China Coal,2018,44(8):77-81,126.
[6]张凯,皮礼明,张如科.软弱泥化巷道破坏机理及修复控制技术研究[J].中国煤炭,2018,44(6):65-69.ZHANG Kai,PI Liming,ZHANG Ruke.Study on damage mechanism and repairing control technology of soft clay roadway[J].China Coal,2018,44(6):65-69.
[7]王立平,李学华,程建龙,等.巷道受断层端部应力集中失稳机理及控制研究[J].采矿与安全工程学报,2017,34(3):472-478.WANG Liping,LI Xuehua,CHENG Jianlong,et al.Roadway instability under stress concentration near the fault end and its control technique[J].Journal of Mining&Safety Engineering,2017,34(3):472-478.
[8]朱利民.WPZ-45/350L型多功能巷道修复机的设计[J].中国煤炭,2016,42(3):64-66.ZHU Limin.Design and application of WPZ-45/350Ltype multifunctional roadway repair machine[J].China Coal,2016,42(3):64-66.
[9]赵洪亮,姚精明,何富连,等.大断面煤巷预应力桁架锚索的理论与实践[J].煤炭学报,2007,32(10):1061-1065.ZHAO Hongliang,YAO Jingming,HE Fulian,et al.Application of prestress truss cable in large cross section coal roadway[J].Journal of China Coal Society,2007,32(10):1061-1065.
[10]何富连,栗建平,蒋红军,等.特大断面厚煤顶开切眼复合桁架锚索围岩控制技术[J].中国矿业,2012,21(8):82-85.HE Fulian,LI Jianping,JIANG Hongjun,et al.The application of pre-stress compound truss cable in set-up room with large cross section thick coal roof[J].China Mining Magazine,2012,21(8):82-85.
[11]钱鸣高,石平五,许家林.矿山压力与岩层控制[M].徐州:中国矿业大学出版社,2010.
[12]侯朝炯.深部巷道围岩控制的有效途径[J].中国矿业大学学报,2017,46(3):467-473.HOU Chaojiong.Effective approach and basic framework of surrounding rocks control in deep roadway[J].Journal of China University of Mining&Technology,2017,46(3):467-473.