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采用大型三轴仪,对双江口高土石坝的砂岩过渡料进行试验研究。通过对不同试样直径D和不同最大粒径dmax的过渡料进行等σ3应力路径试验,分析了D、dmax对应力-应变-强度特性的影响,研究了室内试验存在的尺寸效应。结果表明,对同一种级配试样,破坏主应力差、内摩擦角和初始切线模量随试样直径的减小而增大;在低围压下破坏主应力差和内摩擦角的增大趋势明显,但随围压增大,增大幅度减小;对同样的试样直径,最大粒径增大,破坏主应力差和内摩擦角增大,同样这种增大趋势在低围压下明显。
A large triaxial apparatus was used to test the sandstone transition material of the high earth-rockfill dam in Shuangjiangkou. Through the σ3 stress path test on the transition material with different sample diameter D and different maximum particle size dmax, the influence of D and dmax on the stress-strain-strength characteristics was analyzed and the size effect existing in laboratory experiments was studied. The results show that for the same kind of graded specimens, the difference between the main stress difference and the internal friction angle and initial tangent modulus increases with the decrease of the diameter of the specimen. Under the low confining pressure, the main stress difference and internal friction angle are increased The trend is obvious, but with the confining pressure increases, the increase decreases; the same sample diameter, the maximum particle size increases, the main damage to the stress difference and the internal friction angle increases, the same trend of increasing in the low Press down obviously.