大倾角回采巷道松动圈支护优化
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摘要
随着大倾角煤层广泛开采,其巷道顶底板破坏已经严重影响到矿山的安全生产。文章以西南地区5个矿区的6条大倾角回采巷道为工程背景,首先运用地质雷达对6条大倾角回采巷道顶板及两帮围岩松动圈范围进行现场测试;其次采用3DEC离散元数值模拟软件,对围岩破坏方式、破坏塑性区进行模拟与分析,并综合现场实测结果绘制了大倾角回采巷道围岩松动圈范围图;最后以异形断面为例,对巷道支护方案进行优化。结果表明,采用"锚杆+锚索+钢带"的支护方案,能够有效地控制回采巷道围岩变形破坏,减小底板及两帮破坏范围,确保煤矿安全生产。
With the wide mining of coal seam with large inclination,failure at roof and floor of stoping roadway significantly affects the safety of mining construction.Based on the six stoping roadways of five mining areas in southwest China,site test was conducted by a geological radar on the loosing circles at roofs and two sides of six stoping roadways with large inclinations,simulation and analysis were performed by 3 DEC software regarding the mode of rock mass failure and plastic zone of failure,an areal map of loosing circle of stoping roadway with large inclination was drawn by taking the measured data into consideration,and the support scheme of stoping roadway was optimized.The results show that it will effectively control rock mass failure of stoping roadway and reduce the failure scope at floor and two sides with the scheme of"anchor bolt+ anchor cable+ steel strip",guaranteeing the safety of mining construction.
With the wide mining of coal seam with large inclination,failure at roof and floor of stoping roadway significantly affects the safety of mining construction.Based on the six stoping roadways of five mining areas in southwest China,site test was conducted by a geological radar on the loosing circles at roofs and two sides of six stoping roadways with large inclinations,simulation and analysis were performed by 3 DEC software regarding the mode of rock mass failure and plastic zone of failure,an areal map of loosing circle of stoping roadway with large inclination was drawn by taking the measured data into consideration,and the support scheme of stoping roadway was optimized.The results show that it will effectively control rock mass failure of stoping roadway and reduce the failure scope at floor and two sides with the scheme of"anchor bolt+ anchor cable+ steel strip",guaranteeing the safety of mining construction.
引文
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[11]赵志强,马念杰,郭晓菲,等.大变形回采巷道蝶叶型冒顶机理与控制[J].煤炭学报,2016,41(12):2932-2939.ZHAO Zhiqiang,MA Nianjie,GUO Xiaofei,et al.Falling Principle and Support Design of Butterfly-failure Roof in Large Deformation Mining Roadways[J].Journal of China Coal Society,2016,41(12):2932-2939.
[12]曹树刚,王帅,王寿全,等.大倾角煤层回采巷道断面适应性[J].东北大学学报(自然科学版),2017,38(3):436-441.CAO Shugang,WANG Shuai,WANG Shouquan,et al.Adaptability of Roadway Section Shape in Deep Inclined Seam[J].Journal of Northeastern University(Natural Science),2017,38(3):436-441.
[13]HONGYUN YANG,SHUANG CAO,YONG LI,et al.Assessment of Excavation Broken Zone around Gateways under Various Geological Conditions:A Case Study in Sichuan Province,China[J].Minerals,2016,6(3):72.
[2]于远祥,洪兴,陈方方.回采巷道煤体荷载传递机理及其极限平衡区的研究[J].煤炭学报,2012,37(10):1630-1636.YU Yuanxiang,HONG Xing,CHEN Fangfang.Study on Load Transmission Mechanism and Limit Equilibrium Zone of Coal-wall in Extraction Opening[J].Journal of China Coal Society,2012,37(10):1630-1636.
[3]赵毅鑫,姜耀东,王宏伟,等.基于扰动状态理论的回采巷道稳定性分析[J].中国矿业大学学报,2014,43(2):233-240.ZHAO Yixin,JIANG Yaodong,WANG Hongwei,et al.Analysis of Gaterroad Stability in Underground Coal Mining Based on Disturbed State Theory[J].Journal of China University of Mining&Technology,2014,43(2):233-240.
[4]陈晓祥,杜贝举,王雷超,等.综放面动压回采巷道帮部大变形控制机理及应用[J].岩土工程学报,2016,38(3):460-467.CHEN Xiaoxiang,DU Beiju,WANG Leichao,et al.Control Mechanism and Application of Large Deteformation of Dynamic Pressure Roadway of Fully Mechainzed Top-coal Caving Face[J].Chinese Journal of Geotechnical Engineering,2016,38(3):460-467.
[5]勾攀峰,侯朝炯.回采巷道锚杆支护顶板稳定性分析[J].煤炭学报,1999,24(5):466-470.GOU Panfeng,HOU Chaojiong.Stability Analysis of the Roof of Extraction Opening Supported with Bolts[J].Journal of China Coal Society,1999,24(5):466-470.
[6]勾攀峰,辛亚军.大倾角煤层回采巷道顶板结构体稳定性分析[J].煤炭学报,2011,36(10):1607-1611.GOU Panfeng,XIN Yajun.Stability Analysis of Roof Structure in Pitched Seam Gateway[J].Journal of China Coal Society,2011,36(10):1607-1611.
[7]辛亚军,勾攀峰,贠东风,刘华云.大倾角软岩回采巷道围岩失稳特征及支护分析[J].采矿与安全工程学报,2012,29(5):637-643.XIN Yajun,GOU Panfeng,YUN Dongfeng,LIU Huayun.Instability Characteristics and Support Analysis on Surrounding Rock of Soft Rock Gateway in High-pitched Seam[J].Journal of Mining&Safety Engineering,2012,29(5):637-643.
[8]潘卫东,任志成,孔德中,等.大倾角煤层回采巷道的矿山压力研究[J].煤矿安全,2014,45(3):35-37.PAN Weidong,REN Zhicheng,KONG Dezhong,et al.Research on Underground Pressure of Mining Roadway in Large Dip Seam[J].Safety in Coal Mines,2014,45(3):35-37.
[9]刘建峰.大倾角煤层回采巷道顶板稳定性分析[J].煤矿现代化,2017(4):66-67+70.LIU Jianfeng.Analysis of Gateway Roof Stability in Pitched Seam[J].Coal Mine Modernization,2017(4):66-67+70.
[10]杨科,谢广祥.大倾角煤层回采巷道非对称锚网索支护与实践[J].地下空间与工程学报,2013,9(4):924-927+933.YANG Ke,XIE Guangxiang.Study on Asymmetrical Bolting Support of Retreating Entry in Large Dip Coal Seam and It′s Practice[J].Chinese Journal of Underground Space and Engineering,2013,9(4):924-927+933.
[11]田明富,窦礼同.大倾角煤巷非对称变形特征与锚网索支护技术[J].煤矿开采,2014,19(1):60-63.TIAN Mingfu,DOU Litong.Non-symmetry Deformation Characteristics of Large-angle Coal Roadway and Anchor Cable and Mesh Supporting Technology[J].Coal Mining Technology,2014,19(1):60-63.
[11]赵志强,马念杰,郭晓菲,等.大变形回采巷道蝶叶型冒顶机理与控制[J].煤炭学报,2016,41(12):2932-2939.ZHAO Zhiqiang,MA Nianjie,GUO Xiaofei,et al.Falling Principle and Support Design of Butterfly-failure Roof in Large Deformation Mining Roadways[J].Journal of China Coal Society,2016,41(12):2932-2939.
[12]曹树刚,王帅,王寿全,等.大倾角煤层回采巷道断面适应性[J].东北大学学报(自然科学版),2017,38(3):436-441.CAO Shugang,WANG Shuai,WANG Shouquan,et al.Adaptability of Roadway Section Shape in Deep Inclined Seam[J].Journal of Northeastern University(Natural Science),2017,38(3):436-441.
[13]HONGYUN YANG,SHUANG CAO,YONG LI,et al.Assessment of Excavation Broken Zone around Gateways under Various Geological Conditions:A Case Study in Sichuan Province,China[J].Minerals,2016,6(3):72.