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针对两种级配不同的福建标准干砂,在不同固结压力下进行常规三轴试验,着重探讨不同初始相对密实度对砂土抗剪强度的影响.试验结果表明:考虑砂土的初始结构性,即初始相对密实度不同时,砂土的强度特性会发生较为显著的变化.相同试验围压下,随着密实度的增加,试样的初始切线模量有所增长、试样的峰值偏应力逐渐增大;而相同密实度的情况下,随着试验围压的增加,初始切线模量也有较为显著的增长、试样的峰值偏应力也逐渐增大;试样的内摩擦角随着初始相对密实度的增加基本呈线性增长.结合试验结果建立了砂土抗剪强度指标与初始相对密实度之间的关系,进而考虑初始相对密实度对莫尔-库伦准则进行修正.
According to the two kinds of Fujian standard dry sand with different grading, the conventional triaxial tests under different consolidation pressures are carried out, and the influence of different initial relative densities on the shear strength of sand is emphasized. The experimental results show that considering the initial structure of sand That is, the initial relative density of different sand and soil strength characteristics will occur more significant changes under the same test confining pressure, with the increase of the density, the initial tangent modulus of the sample increased, the peak value of the sample While the same densities, with the increase of test confining pressure, the initial tangent modulus also increases obviously, and the peak deviatoric stress also increases gradually. The internal friction angle of the specimen increases with the increase of test confining pressure The initial relative density increases linearly with the increase of initial relative density.According to the test results, the relationship between the shear strength index and the initial relative density of sand is established, and then the Moiré-Coulomb criterion is revised considering the initial relative density.