三轴压缩下云母片岩强度和变形特性试验研究
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摘要
为了研究云母片岩在三向应力状态下的强度特征和变形特性,利用MTS815.03电液伺服试验机,进行了云母片岩的三轴压缩试验。通过试验所得的不同围压、不同含水状态下云母片岩的应力—应变全过程曲线,揭示了干燥与饱水云母片岩的峰值强度、弹性模量、泊松比及软化系数随围压的变化规律,最后分析了云母片岩的破坏形式。结果表明,随围压升高,云母片岩的峰值强度、弹性模量及泊松比均逐渐增加,其软化系数随围压增加呈先升后降的趋势;饱水后的云母片岩其峰值强度、弹性模量明显低于干燥状态,而泊松比则高于干燥状态;另外,三轴压缩条件下的云母片岩大都发生剪切滑移破坏。
For research of mica-schist strength and deformation characteristics under three-dimensional stress state,It is studied by using rock mechanics test equipment MTS815.03 to do tri-axial compression experiments on the mica-schist.With stress-strain curves of mica-schist under the conditions of different confining pressure and moisture conditions,the evolution laws are revealed for both dry and saturated mica-schist peak strength,elastic modulus,poisson' s ratio and softening coefficient,in addition,the failure type is analyzed.The results show that with the increase of confining pressure,the peak strength,elastic modulus,poisson' s ratio increase gradually,and the softening coefficient varies in a manner of first increasing then decreasing.The peak strength and elastic modulus decrease significantly by saturating,but poisson' s ratio increase.In addition,shear slip failure mostly occur under tri-axial compression of mica-schist.
For research of mica-schist strength and deformation characteristics under three-dimensional stress state,It is studied by using rock mechanics test equipment MTS815.03 to do tri-axial compression experiments on the mica-schist.With stress-strain curves of mica-schist under the conditions of different confining pressure and moisture conditions,the evolution laws are revealed for both dry and saturated mica-schist peak strength,elastic modulus,poisson' s ratio and softening coefficient,in addition,the failure type is analyzed.The results show that with the increase of confining pressure,the peak strength,elastic modulus,poisson' s ratio increase gradually,and the softening coefficient varies in a manner of first increasing then decreasing.The peak strength and elastic modulus decrease significantly by saturating,but poisson' s ratio increase.In addition,shear slip failure mostly occur under tri-axial compression of mica-schist.
引文
[1]沈强.山区高速公路层状岩质边坡稳定性监测与预测方法研究[博士论文D].武汉:中国科学院武汉岩土力学所,2006.
[2]陈文玲.黑河水库坝肩边坡云母石英片岩三轴蠕变机理及蠕变模型研究[博士论文D].西安:长安大学,2009.
[3]梅涛,王禹,彭斌等.鄂西北片岩质边坡渗流计算及稳定性分析[J].土工基础,2010,24(4):77～80.
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[5]于德海,彭建兵.三轴压缩下影响绿泥石片岩力学性质试验研究[J].岩石力学与工程学报,2009,28(1):205～211.
[6]熊德国,赵忠明,苏承东等.饱水对煤系地层力学性质影响的试验研究[J].岩石力学与工程学报,2011,30(5):998～1006.
[7]尤明庆.岩样三轴压缩的破坏形式和Coulomb强度准则[J].地质力学学报,2002,8(2):181～184.
[2]陈文玲.黑河水库坝肩边坡云母石英片岩三轴蠕变机理及蠕变模型研究[博士论文D].西安:长安大学,2009.
[3]梅涛,王禹,彭斌等.鄂西北片岩质边坡渗流计算及稳定性分析[J].土工基础,2010,24(4):77～80.
[4]彭斌,黄河,尚义敏等.鄂西北片岩质边坡变形破坏机制及对策[J].土工基础,2010,24(2):49～52.
[5]于德海,彭建兵.三轴压缩下影响绿泥石片岩力学性质试验研究[J].岩石力学与工程学报,2009,28(1):205～211.
[6]熊德国,赵忠明,苏承东等.饱水对煤系地层力学性质影响的试验研究[J].岩石力学与工程学报,2011,30(5):998～1006.
[7]尤明庆.岩样三轴压缩的破坏形式和Coulomb强度准则[J].地质力学学报,2002,8(2):181～184.