巷道支护强度对层状矿体围岩弱结构面稳定性的影响
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摘要
巷道围岩弱结构面的失稳会造成巷道周边围岩发生变形和破坏。通过计算考虑支护强度影响的巷道周边围岩应力分布,推导出弱结构面上法向与切向应力的分布式。得出了在巷道支护强度影响下弱结构面上发生滑动的极限条件,确定了巷道支护强度影响下弱结构面上预测滑移区的位置以及范围。结合江西省彭泽县上横山钒矿地质条件,分析了不同条件对弱结构面上滑动的极限条件、法向与切向应力比值τ/σn值的影响,结果表明,随着巷道支护强度的增加,τ/σn值曲线峰值会产生降低,得出其可提高围岩弱结构面稳定性的依据。
The plane of weakness instability in roadway will cause deformation and destruction around surrounding rock.The normal and tangential stress distributed formula on plane of weakness was deduced by calculating the stress distribution of surrounding rock around roadway under support pressure.Under support pressure,the slip extreme conditions of the plane of weakness were obtained,and the position and scope of predicted slip zones was determined.Different factors affected to the slip extreme conditions and the value of the normal and tangential stress ratioτ/σn were analyzed for Shanghengshan vanadium mine in Jiangxi.The results showed that with the increase of roadway support pressure,τ/σn would produce lower peak value,which proved that support pressure could improve stability for the plane of weakness in surrounding rock.
The plane of weakness instability in roadway will cause deformation and destruction around surrounding rock.The normal and tangential stress distributed formula on plane of weakness was deduced by calculating the stress distribution of surrounding rock around roadway under support pressure.Under support pressure,the slip extreme conditions of the plane of weakness were obtained,and the position and scope of predicted slip zones was determined.Different factors affected to the slip extreme conditions and the value of the normal and tangential stress ratioτ/σn were analyzed for Shanghengshan vanadium mine in Jiangxi.The results showed that with the increase of roadway support pressure,τ/σn would produce lower peak value,which proved that support pressure could improve stability for the plane of weakness in surrounding rock.
引文
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[14]肖猛,丁德馨,莫勇刚,等.软岩巷道围岩稳定性的FLAC3D数值模拟研究[J].矿业研究与开发,2007,27(1):73-75.
[2]赵海军,马凤山,丁德民,等.采动影响下巷道围岩变形与破坏的弱结构面效应[J].地质灾害与环境保护,2009,20(2):51-56.
[3]马全礼,代进,李洪,等.锚杆支护对围岩碎裂区的作用分析[J].矿山压力与顶板管理,2005,22(1):42-43,46.
[4]徐龙仓,李军平.提高支护强度控制深部巷道围岩变形[J].矿山压力与顶板管理,2004,21(3):23-25.
[5](澳)B.H.G.Brady,(英)E.T.Brown.地下采矿岩石力学[M].佘诗刚,等译.北京:科学出版社,2011:193-212.
[6]李俊平,连民杰,等.矿山岩石力学[M].北京:冶金工业出版社,2003:184-185.
[7]汤伯森.弹塑围岩最小支护抗力和最大允许变形的估算[J].岩土工程学报,1986(4):81-88.
[8]宋建波,张倬元,于远忠,等.岩体经验强度准则及其在地质工程中的应用[M].北京:地质出版社,2002:40-41.
[9]李文平.煤及软岩层中地应力值的初步估算方法[J].岩石力学与工程学报,2000,19(2):234-237.
[10]钱鸣高,石平五,许家林,等.矿山压力与岩层控制[M].徐州:中国矿业大学出版社,2011:41-42.
[11]Halakatevakis N,Sofianos A I,Correlation of the HoekBrown failure criterion for a sparsely jointed rock mass with an extended plane of weakness theory[J].International Journal of Rock Mechanics and Mining Sciences,2010,47(7):1166-1179.
[12]高富强.最大水平主应力对巷道围岩稳定性影响的数值分析[J].矿业研究与开发,2008,28(1):62-64.
[13]赵海军,马凤山,李国庆,等.开挖引起断层活化对井巷围岩的变形破坏[J].金属矿山,2008(6):9-12,40.
[14]肖猛,丁德馨,莫勇刚,等.软岩巷道围岩稳定性的FLAC3D数值模拟研究[J].矿业研究与开发,2007,27(1):73-75.
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