薄弱泥岩顶板厚煤层马头门围岩失稳分析及加固技术
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摘要
为解决漳村煤矿薄弱泥岩顶板厚煤层大断面马头门失稳问题,采用钻孔窥视仪对围岩深部破坏情况进行成像观察,分析了马头门破坏原因,并采用FLAC~(3D)软件模拟了围岩失稳破坏过程,研究了其破坏机理,在此基础上提出了加固方案,即先压注水泥基无机材料,充填围岩中的张开裂缝,再补注聚氨酯型高分子化学有机材料,密实围岩微小裂隙,最后对围岩周边施以预应力全长锚固强力锚索支护。结果表明:前后2次分别采用2种材料高压注浆,能够大范围充填岩体裂隙,较好地恢复破碎围岩的完整结构,大幅度提高加固效果,而锚索支护相当于对围岩周边施加了强力的边界条件,使其具有较强的主动抵抗再次变形能力。2种措施配合使用,解决了厚煤层薄弱泥岩顶板条件下破碎马头门的修复难题。
In order to solve the instability problem of the large section ingate with thin and weak mudstone roof and thick coal seam in Zhangcun Coal Mine,this article identified the causes of ingate damage with imaging observation of deep surrounding rock crushing condition by borehole camera,and used FLAC~(3D) software to simulate the surrounding rock failure process and analyzed the mechanism of ingate damage. Based on analysis results,reinforcement scheme of the damaged ingate was proposed,including injecting cement inorganic material,recharging polyurethane chemical organic material and setting full-size grouted pre-stressed anchor cable. The results showed that injecting two times respectively by two kinds of materials could enlarge the range of fracture filling,recover complete structure of broken rock and improve the reinforcement effect greatly,yet setting anchor cable was equivalent to apply strength boundary condition to the surrounding rock,with a strong initiative to resist re-deformation. The combination of the two measures could solve the repairing problem of broken ingate with thin and weak mudstone roof and thick coal seam successfully.
In order to solve the instability problem of the large section ingate with thin and weak mudstone roof and thick coal seam in Zhangcun Coal Mine,this article identified the causes of ingate damage with imaging observation of deep surrounding rock crushing condition by borehole camera,and used FLAC~(3D) software to simulate the surrounding rock failure process and analyzed the mechanism of ingate damage. Based on analysis results,reinforcement scheme of the damaged ingate was proposed,including injecting cement inorganic material,recharging polyurethane chemical organic material and setting full-size grouted pre-stressed anchor cable. The results showed that injecting two times respectively by two kinds of materials could enlarge the range of fracture filling,recover complete structure of broken rock and improve the reinforcement effect greatly,yet setting anchor cable was equivalent to apply strength boundary condition to the surrounding rock,with a strong initiative to resist re-deformation. The combination of the two measures could solve the repairing problem of broken ingate with thin and weak mudstone roof and thick coal seam successfully.
引文
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[17]王余银,徐文强,于荣光,等.锚索及壁后注浆联合加固技术在修复马头门中的应用[J].中州煤炭,2011(4):59-60,97.Wang Yuyin,Xu Wenqiang,Yu Rongguang,et al.Zhongzhou Coal,2011(4):59-60,97.
[18]王连海,贾利平,车承斌,等.注浆、预应力锚索加固硐室与马头门[J].煤炭科学技术,2000,28(4):31-33.Wang Lianhai,Jia Liping,Che Chengbin,et al.Grouting and prestressed anchor cable reinforcement the chamber and ingate[J].Coal Science and Technology,2000,28(4):31-33.
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[20]康红普,王金华.煤巷锚杆支护理论与成套技术[M].北京:煤炭工业出版社,2007.
[2]蔡海兵,程桦,荣传新,等.复杂条件下深井马头门围岩稳定性分析及支护结构优化[J].采矿与安全工程学报,2015,32(2):298-304.Cai Haibing,Cheng Hua,Rong Chuanxin,et al.Rock stability analysis and supporting structure optimization of deep shaft ingate under complex conditions[J].Journal of Mining&Safety Engineering,2015,32(2):298-304.
[3]王晓健.煤矿深立井马头门围岩历时稳定性及其控制技术[D].淮南:安徽理工大学,2015.
[4]陈志勇.张集矿深井马头门围岩稳定性分析与支护研究[D].淮南:安徽理工大学,2015.
[5]项德彬.煤矿深立井马头门围岩稳定性分析及实验研究[D].淮南:安徽理工大学,2015.
[6]刘延生,赵景忠,杨家恩,等.千米深井马头门及井筒修复工程实践与认识[J].建井技术,2005,26(3/4):1-6.Liu Yansheng,Zhao Jingzhong,Yang Jiaen,et al.Practice and knowledge of restoration of ingate and shaft in 1000m deep well[J].Mine Construction Technology,2005,26(3/4):1-6.
[7]姚直书,程桦,高业禄,等.复杂地质条件下深井马头门支护结构及应用[J].煤炭科学技术,2009,37(1):69-71,13.Yao Zhishu,Cheng Hua,Gao Yelu,et al.Ingate support structure and application in deep mine shaft with complicated geological conditions[J].Coal Science and Technology,2009,37(1):69-71,13.
[8]田柯.深井大断面马头门支护理论及技术研究[D].太原:太原理工大学,2011.
[9]陈强.西部地区全深冻结井筒马头门破坏机理及修复加固设计研究[D].淮南:安徽理工大学,2013.
[10]肖长春.深井高应力马头门支护破坏机理及防治[J].煤炭科技,2011(2):55-58.Xiao Changchun.Prevention and destroy mechanism of ingate support under conditions of deep mining and high stress[J].Coal Science and Technology Magazine,2011(2):55-58.
[11]荣传新.软弱围岩马头门修复加固技术及效果[C]//中国煤炭学会成立五十周年系列文集2012年全国矿山建设学术会议专刊(下).北京:中国煤炭学会煤矿建设与岩土工程专业委员会,中国煤炭学会煤矿建设与岩土工程专业委员会,2012:3.
[12]杨青.钱营孜煤矿马头门围岩变形特性与支护优化研究[D].淮南:安徽理工大学,2008.
[13]胡晓旭,聂羽,武文东,等.伊犁一矿副立井马头门附近围岩加固技术[J].建井技术,2016,37(2):6-9.Hu Xiaoxu,Nie Yu,Wu Wendong,et al.Reinforcement technology of surrounding rock near ingate of mine auxiliary shaft in Yili No.1 Mine[J].Mine Construction Technology,2016,37(2):6-9.
[14]康红普,林健,杨景贺,等.松软破碎井筒综合加固技术研究与实践[J].采矿与安全工程学报,2010,27(4):447-452.Kang Hongpu,Lin Jian,Yang Jinghe,et al.Study and Practice on Combined Technology for Reinforcing Soft and Fractured Shaft[J].Journal of Mining&Safety Engineering,2010,27(4):447-452.
[15]王天亮,荣传新,李冲志.潘一矿副井马头门锚注联合修复加固技术[J].安徽理工大学学报:自然科学版,2013,33(1):79-82.Wang Tianliang,Rong Chuanxin,Li Chongzhi.Panyi Coal Mine auxiliary shaft ingate repairing by reinforcement with anchoring and grouting technology and its effect[J].Journal of Anhui University of Science and Technology:Natural Science,2013,33(1):79-82.
[16]李霄尖,苗艳虾,何富连,等.锚杆索环形一体化支护技术在马头门修复中的应用[J].煤炭工程,2011(12):65-67,70.Li Xiaojian,Miao Yanxia,He Fulian,et al.Application of anchor circular integration support technology to repair of mine shaft ingate[J].Mine Engineering,2011(12):65-67,70.
[17]王余银,徐文强,于荣光,等.锚索及壁后注浆联合加固技术在修复马头门中的应用[J].中州煤炭,2011(4):59-60,97.Wang Yuyin,Xu Wenqiang,Yu Rongguang,et al.Zhongzhou Coal,2011(4):59-60,97.
[18]王连海,贾利平,车承斌,等.注浆、预应力锚索加固硐室与马头门[J].煤炭科学技术,2000,28(4):31-33.Wang Lianhai,Jia Liping,Che Chengbin,et al.Grouting and prestressed anchor cable reinforcement the chamber and ingate[J].Coal Science and Technology,2000,28(4):31-33.
[19]康红普,冯志强.煤矿巷道围岩注浆加固技术的现状与发展趋势[J].煤矿开采,2013,18(3):1-7.Kang Hongpu,Feng Zhiqiang.Status and development tendency of roadway grunting reinforcement technology in coal mine[J].Coal Mining Technology,2013,18(3):1-7.
[20]康红普,王金华.煤巷锚杆支护理论与成套技术[M].北京:煤炭工业出版社,2007.