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对不同密度的某砂卵砾石料试样进行了三轴固结排水剪切试验,研究了密度对砂卵砾石料强度、应力应变性质的影响。结果表明,随密度的增大,试样的强度指标呈增大趋势;不同围压下,随密度的增大,破坏时的轴向应变具有减小的趋势,且在低围压下这种趋势较明显;密度越大,试样的剪胀性越强,发生相变时的轴向变形和体积变形越小;试样发生相变时的应力水平一般大于0.5,因此在对高土石坝进行应力变形分析时应合理考虑粗粒土的剪胀性。
Three-axis consolidation drainage and drainage tests were carried out on some sand-gravel samples with different densities. The effects of density on the strength and stress-strain properties of sand-gravel material were studied. The results show that with the increase of density, the strength of the sample shows an increasing trend. Under different confining pressures, the axial strain at failure decreases with the increase of density. Under low confining pressure, The trend is obvious; the greater the density, the stronger the dilatancy of the specimen, the smaller the axial deformation and the volume deformation when the phase change occurs. The stress level of the specimen during phase transition is generally greater than 0.5, For the analysis of stress and deformation, the dilatancy of coarse grained soil should be reasonably considered.