构造应力区巷道变形破坏特征及控制技术研究
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摘要
水平构造应力对巷道围岩稳定有重要的影响,针对鹤壁九矿东总回风巷在锚网索喷+U型钢支护难以保证巷道稳定的情况,通过相似材料模拟试验研究不同水平应力作用下锚注支护巷道围岩变形破坏和位移变化特征.试验表明,随着水平应力的增大,底板加强后,水平应力对顶板的作用明显,当水平载荷达到49 MPa时有少量浆皮脱落,左肩部出现块状冒落,底板比较稳定,没有发生明显臌起,只出现少量横向裂隙,锚注支护结构能控制围岩变形.将试验结果在现场应用后,通过矿压观测,两帮的最大移近量为144 mm,顶底板最大移近量为105 mm,锚注支护提高了围岩的自承能力,能够维持巷道稳定,为类似地质条件下的巷道支护提供借鉴.
The stability of surrounding rock of roadway is affected by tectonic stress.Because bolting and shotcreting with mesh +U-steel support cannot keep the stability of eastern main return airway in No.9 coal mine of Hebi coal stock Co.Ltd.,deformation and failure characters of bolting and grouting support roadway are studied by means of the similar simulation test at different levels of horizontal stress.The test result shows that enforced floor,with the increase of horizontal stress,when the loading is 49 MPa,a little concrete is fallen and block in left shoulder is caving.Otherwise,the floor is stable and only occurs a few cracks,and there is not heave.The effect in roof is obvious and the support structure can contain the deformation of around strata.When the plan is applied in field,mine pressure observation indicates that the most convergence of two walls and top-floor is 144 mm and 105 mm respectively.Thusly,bolting and grouting support improves self-bearing ability of surrounding rock and can keep the stability of roadway.The study can provide a reference for roadway support with similar conditions.
The stability of surrounding rock of roadway is affected by tectonic stress.Because bolting and shotcreting with mesh +U-steel support cannot keep the stability of eastern main return airway in No.9 coal mine of Hebi coal stock Co.Ltd.,deformation and failure characters of bolting and grouting support roadway are studied by means of the similar simulation test at different levels of horizontal stress.The test result shows that enforced floor,with the increase of horizontal stress,when the loading is 49 MPa,a little concrete is fallen and block in left shoulder is caving.Otherwise,the floor is stable and only occurs a few cracks,and there is not heave.The effect in roof is obvious and the support structure can contain the deformation of around strata.When the plan is applied in field,mine pressure observation indicates that the most convergence of two walls and top-floor is 144 mm and 105 mm respectively.Thusly,bolting and grouting support improves self-bearing ability of surrounding rock and can keep the stability of roadway.The study can provide a reference for roadway support with similar conditions.
引文
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[2]孔德森,蒋金泉.深部巷道在构造应力场中稳定性分析[J].矿山压力与顶板管理,2000,17(4):56-58.
[3]蔡美峰,何满潮,刘东燕.岩石力学与工程[M].北京:科学出版社,2006.
[4]沈明荣.岩体力学[M].上海:同济大学出版社,1999.
[5]安欧.构造应力场[M].北京:地震出版社,1992.
[6]宋志敏,程增庆,张生华.构造应力区软岩巷道围岩变形与控制[J].矿山压力与顶板管理,2005,22(4):48-50.
[7]陈立伟,唐征,田坤云.构造应力对煤层巷道围岩稳定性的影响研究[J].煤矿现代化,2007,76(1):38-39.
[8]单晓云,梅海斌,徐东强,等.在构造应力场中采动对底板运输巷道稳定性的影响[J].岩石力学与工程学报,2005,24(12):2101-2106.
[9]陈炎光,陆士良.中国煤矿巷道围岩控制[M].徐州:中国矿业大学出版社,1994.
[10]姜耀东,刘文岗,赵毅鑫,等.开滦矿区深部开采中巷道围岩稳定性研究[J].岩石力学与工程学报,2005,24(11):1857-1862.
[11]勾攀峰,韦四江,张盛.不同水平应力对巷道稳定性的模拟研究[J].采矿与安全工程学报,2010,27(2):113-118.
[12]李学华,姚强岭,张农,等.高水平应力跨采巷道围岩稳定性模拟研究[J].采矿与安全工程学报,2008,25(4):420-425.
[13]马宇.金川二矿区地应力场研究与地下工程稳定[D].北京:中国地质科学院,2006.
[14]李学华,王卫军,侯朝炯.加固顶板控制巷道底膨的数值分析[J].中国矿业大学学报,2003,32(4):436-439.
[15]李学华,杨宏敏,刘汉喜,等.动压软岩巷道锚注加固机理与应用研究[J].采矿与安全工程报,2006,23(2):159-164.
[16]董正坤,朱庆华,李广余.注浆加固技术研究[J].矿山压力与顶板管理,2000,17(4):44-46.
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