细砂岩峰后力学特性和材料强度研究
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摘要
通过细砂岩三轴试验,得到不同围压的应力—应变曲线和轴向应变—径向应变曲线,分析和研究了峰值点与断层产生点的不同。试验表明,岩石在断层产生之后沿断层面滑移,围压、岩块的材料强度和岩块排列的结构效应三者共同决定了岩石的峰后力学行为。对比不同加载历史的岩块压剪试验数据,表明试验设计的围压对岩块材料强度影响很小,压缩实验和剪切实验得到的强度参数存在差异。
With the triaxial test of the fine sandstone,different stress-strain curve and axial strain-radial strain curve of the surrounding rock were obtained.The difference between the peak point and the fault point was studied and analyzed.The experiment showed that the rock would be slidden along the fault surface after the fault occurred and the material strength of the surrounding rock and lump rock and the structure effect of the lump rock arrangement would jointly determine the post-peak mechanics behaviors of the rock.The compressive and shearing test data of the rocks with different loaded histories showed that the experiment designed surrounding rock would have a small influence to the rock material strength and there was a difference in the strength parameters between the compressive experiment and the shearing experiment.
With the triaxial test of the fine sandstone,different stress-strain curve and axial strain-radial strain curve of the surrounding rock were obtained.The difference between the peak point and the fault point was studied and analyzed.The experiment showed that the rock would be slidden along the fault surface after the fault occurred and the material strength of the surrounding rock and lump rock and the structure effect of the lump rock arrangement would jointly determine the post-peak mechanics behaviors of the rock.The compressive and shearing test data of the rocks with different loaded histories showed that the experiment designed surrounding rock would have a small influence to the rock material strength and there was a difference in the strength parameters between the compressive experiment and the shearing experiment.
引文
[1]张帆,盛谦,朱泽奇,等.三峡花岗岩峰后力学特性及应变软化模型研究[J].岩石力学与工程学报,2008,27(增1):2651～2655.
[2]Cho N,Martin C D,Sego D C.Development of a shear zone inbrittle rock subjected to direct shear.Int.J.Rock Mech MinSci[J],2008,45(8).
[3]周纪军,单仁亮,王辉,等.损伤和破坏岩石的强度研究[J].矿业研究与开发,2010,30(3):30～33.
[4]李世平,吴振业,贺永年,等.岩石力学简明教程[M].北京:煤炭工业出版社,1996:7～20.
[5]尤明庆.岩石的力学性质[M].北京:地震出版社,2007:26～30.
[6]Tiwari R P,Rao K S.Post failure behaviour of a rock massunder the influence of triaxial and true triaxial confinement[J].Engineering Geology,2006,(84):112～129.
[7]Yang S Q,Jiang Y Z,Xu W Y,et al.Experimentinvestigation on strength and failure behavior of pre-crackedmarble under conventional triaxial compression[J].International Journal of Solids and Structures,2008,(45):4798～4891.
[2]Cho N,Martin C D,Sego D C.Development of a shear zone inbrittle rock subjected to direct shear.Int.J.Rock Mech MinSci[J],2008,45(8).
[3]周纪军,单仁亮,王辉,等.损伤和破坏岩石的强度研究[J].矿业研究与开发,2010,30(3):30～33.
[4]李世平,吴振业,贺永年,等.岩石力学简明教程[M].北京:煤炭工业出版社,1996:7～20.
[5]尤明庆.岩石的力学性质[M].北京:地震出版社,2007:26～30.
[6]Tiwari R P,Rao K S.Post failure behaviour of a rock massunder the influence of triaxial and true triaxial confinement[J].Engineering Geology,2006,(84):112～129.
[7]Yang S Q,Jiang Y Z,Xu W Y,et al.Experimentinvestigation on strength and failure behavior of pre-crackedmarble under conventional triaxial compression[J].International Journal of Solids and Structures,2008,(45):4798～4891.
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