石英云母片岩各向异性蠕变特性试验研究

发布时间：2018-09-04 16:13

【摘要】：为探明丹巴水电站地下厂房区石英云母片岩的各向异性流变力学特性,分别对片理方向不同的2组石英云母片岩试样进行了单轴压缩蠕变试验.根据石英云母片岩蠕变曲线的特征,通过串联一个非线性黏性元件,对损伤西原模型进行改进,并按照Lemaitre应变等效原理推导了模型的蠕变方程,获得了石英云母片岩的一维流变模型参数;分析了片理面和应力水平对瞬时蠕变、衰减蠕变、稳定蠕变和加速蠕变等特性的影响.结果表明:随应力水平提高,石英云母片岩的瞬时弹性模量基本不变,而滞后弹性模量、稳定黏性系数和蠕变破坏时间均减小;加载方向与片理面垂直时,石英云母片岩具有较强的黏塑性和较高强度;加载方向与片理面平行时,石英云母片岩具有较强的瞬时弹性、黏弹性、黏性和延性.
[Abstract]:In order to investigate the anisotropic rheological properties of quartz mica schist in the underground powerhouse area of Danba Hydropower Station, two groups of quartz mica schist samples with different schist direction were tested by uniaxial compression creep test. According to the characteristics of creep curve of quartz mica schist, the damage model is improved by a nonlinear viscous element in series, and the creep equation of the model is deduced according to Lemaitre strain equivalence principle. The one-dimensional rheological model parameters of quartz mica schist are obtained, and the effects of schist plane and stress level on instantaneous creep, attenuation creep, stable creep and accelerated creep are analyzed. The results show that with the increase of stress level, the instantaneous elastic modulus of quartz mica schist is basically unchanged, while the hysteresis elastic modulus, stable viscosity coefficient and creep failure time decrease, and the loading direction is perpendicular to the plane. The quartz mica schist has strong viscoplasticity and high strength, and the quartz mica schist has strong instantaneous elasticity, viscosity and ductility when the loading direction is parallel to the schist face.
【作者单位】：四川大学水利水电学院;四川大学水力学与山区河流开发保护国家重点实验室;
【基金】：国家自然科学基金资助项目(51079092) 四川省科技支撑计划资助项目(2008SZ0163)
【分类号】：TU45

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