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对深圳岭澳三期核电工程选址区域内的强风化角岩的直剪试验研究表明,强风化角岩的剪切变形存在一定的延性且呈塑性破坏,其岩体剪切强度随含水率的增长呈负指数下降趋势,水对岩体强度指标c、具有一定的弱化作用;强风化角岩在饱水条件下只发生剪缩现象,而天然条件下先剪缩后剪胀。引入剪切刚度研究直剪试验的变形特性并考虑水对这一变形指标的影响,研究认为,强风化角岩的剪切刚度随法向应力的增加而增加,且随含水率的增加而降低,低法向应力条件下对水的作用尤其敏感,同时分析了剪切刚度的变化对边坡岩体剪切位移的影响,其结果对边坡的稳定性分析及坡体位移变化的预测具有一定的指导作用。
The direct shear test on strong weathered angle rock in the site of the third stage of Ling’ao Nuclear Power Project in Shenzhen shows that there is some ductility and plastic failure in the shear deformation of strongly weathered horn rock. The shear strength of rock mass varies with the water cut The growth of the rock mass shows a negative exponential declining trend. The water has some weakening effect on the rock mass strength index c and;. The strong weathered horn rock only shear-shrinks under the condition of saturated water, while the shear strength is reduced under natural conditions. With the introduction of shear stiffness, the deformation characteristics of direct shear tests and the influence of water on this deformation index are studied. It is considered that the shear stiffness of strongly weathered horn rocks increases with the increase of normal stress and decreases with the increase of water cut , Under low normal stress is particularly sensitive to the action of water. At the same time, the influence of shear stiffness on the shear displacement of slope rock mass is analyzed. The results of slope stability analysis and slope displacement prediction have A certain guiding role.