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采用复合材料力学分析方法,针对规则节理岩体考虑坐标转换及刚度系数,建立各向异性等效弹性参数的解析公式。通过算例证明了解析公式的可行性,同时对规则节理岩体等效参数规律性进行了研究,分析在不同的节理刚度比值下等效弹性参数的变化规律。结合白鹤滩坝址区柱状节理岩体特征,探讨了其等效弹性参数取值和各向异性特征。研究表明:所采用方法在刚度取值相等时岩体可退化为各向同性介质,且该方法计算结果与实测结果较为吻合;同时发现柱体偏转对等效弹性参数的影响较大,偏转后水平向和铅直向弹性模量分别降低约54%和17%,根据曲线规律性,偏转角度越大,降低程度越高,等效弹性参数的曲线变化反映了其具有明显的各向异性特征。
The mechanics analysis method of composite material is adopted, the coordinate transformation and stiffness coefficient are considered for regular jointed rock mass, and the analytic formula of anisotropic equivalent elastic parameter is established. The feasibility of analytic formula is proved through examples. At the same time, the regularity of the equivalent parameters of the jointed rock mass is studied. The variation of the equivalent elastic parameters under different ratios of joint stiffness is analyzed. Combined with the characteristics of columnar jointed rock mass at Baihetan dam site, the equivalent elastic parameters and anisotropic characteristics are discussed. The results show that the rock mass can be degenerated into an isotropic medium when the stiffness is equal, and the calculation results are in good agreement with the measured results. At the same time, it is found that the column deflection has greater influence on the equivalent elastic parameters. After deflection According to the regularity of the curve, the larger the deflection angle is, the higher the degree of reduction is. The curve change of the equivalent elastic parameter reflects that it has obvious anisotropy characteristics .