【摘要】 通过三轴蠕变试验,考虑坝体填筑的应力路径,对两河口水电站堆石料蠕变特性进行了探讨,分析了其蠕变机理、蠕变模型及参数确定方法。堆石料的轴向和体积蠕变可采用幂函数ε=a(t/t0)b拟合。a为试样初始蠕变,b表征了试样的蠕变速率,与应力状态有关。堆石料轴向和体积初始蠕变均随主应力差的增大而增大,轴向和体积蠕变指数均随围压增大而减小,体积蠕变指数还随主应力比增大而减小。拟合得到的蠕变模型具有良好的效果。更多还原

【Abstract】 Creep behaviors of the Lianghekou rockfill were studied through a triaxial creep test considering stress path of dam body filling,and creep mechanism,creep model and parameters determination were analyzed.A power law ε = a(t/t0) b was formulated for axial and volumetric creep strains of the rockfill sample at initial value a and creep rate b,two parameters that depend on the state of stress.Results show that the initial values of these strains increase with the difference of principal stresses,the exponents decrease with confining pressure,and the volumetric exponent decreases with stress ratio.Calibration by fitting test data shows that this creep model is very satisfactory.更多还原