| 绿泥石片岩各向异性特性研究 |
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| 引用本文： | 刘胜利,陈善雄,余飞,赵文光.绿泥石片岩各向异性特性研究[J].岩土力学,2012,33(12):3616-3623. |
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| 作者姓名： | 刘胜利 陈善雄 余飞 赵文光 |
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| 作者单位： | 1.华中科技大学 土木工程与力学学院 控制结构湖北省重点实验室，武汉 430074； 2.中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室，武汉 430071 |
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| 基金项目： | 2010年国家自然科学基金资助项目(No.51079142) |
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| 摘 要： | 为研究十堰地区片岩的各向异性特性，开展了武当群绿泥石片岩长方体试样的单轴压缩和圆盘试样的间接拉伸试验，探讨了试样各向异性的力学特性和在不同受力状态下的变形破裂特性，揭示了不同变形破裂的力学机制。研究表明，武当群绿泥石片岩具有明显的各向异性性质，平行片理方向强度高，垂直片理方向强度低。该片岩特殊的定向排列片束状构造和片理间的弱胶结作用，致使不同方向上的破坏特征具有明显差异，其力学机制也不相同。在压应力作用下，泊松效应容易引起平行片理面的张拉劈裂和压杆失稳，垂直片理方向容易发生片理面间的剪切破坏。在同一方向上强度具有一致性，即平行片理面抗压和抗拉强度均较垂直片理面强度大。由于片理面间的抗拉承载力极低，在小角度劈裂荷载下，容易发生张拉劈裂和拉剪破坏，因此，实际工程中应尽可能避免片理面间的受拉破坏和沿片理的拉剪破坏。研究结果可以为隧道、边坡支护加固和防水处理提供参考。
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| 关 键 词： | 绿片岩 单轴压缩 巴西试验 各向异性 破裂特性 机制 |
| 收稿时间： | 2012-07-19 |
Anisotropic properties study of chlorite schist |
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| LIU Sheng-li,CHEN Shan-xiong,YU Fei,ZHAO Wen-guang.Anisotropic properties study of chlorite schist[J].Rock and Soil Mechanics,2012,33(12):3616-3623. |
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| Authors: | LIU Sheng-li CHEN Shan-xiong YU Fei ZHAO Wen-guang |
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| Institution: | 1. Hubei Key Laboratory of Control Structure, School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China; 2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China |
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| Abstract: | In order to study anisotropic properties of schist in Shiyan area, Hubei province, uniaxial compressive tests on cubic samples and Brazilian tests on disk samples of Wudang chlorite schist were carried out. The anisotropic strength and fracture characteristics of samples under different loading states were discussed, the mechanism was revealed. The results show that: Wudang chlorite schist shows obvious anisotropic properties; the strength parallel to foliation is higher than the vertical direction. The special orientation bunch structure and the weak cementing strength between foliations caused the different fractures and mechanisms along different directions. Under compression stress, tension-split along foliations and rod press-bent failure are easily caused by Poisson effect; and tension-shear failure is easily caused under vertical direction compression. There is strength consistency in the same direction, for the compression strength and tension strength parallel to foliations are higher than that vertical to foliations. As the tension stress between foliations is extremely low, tension-split failure and tension-shear failure are easily caused with a small angle to foliations under splitting load; so tension failure along foliation should be avoided as far as possible. The results can be referenced for reinforcement and water-proof treatment of tunnel and slope projects. |
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| Keywords: | chlorite schist uniaxial compression Brazilian tests anisotropy fracture characteristics mechanism |
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