相对密实度对砂卵砾石料强度影响的试验研究

Study on Relative Density Effects on Strength Behaviour of Sand-Gravel Material by Triaxial Test

针对某级配覆盖层砂卵砾石料,在不同围压下对不同相对密实度试样进行常规三轴试验,探讨砂卵砾石料相对密实度对其强度特性的影响。试验结果表明:试样的相对密实度、围压与其峰值强度呈正相关;相同围压下,试样破坏偏应力比随着相对密实度的增大呈现不同的增长趋势,且在高围压下,增长趋势不明显;试样非线性强度指标与相对密实度近似呈线性关系。

Conventional triaxial experiments of the sand?gravel material with special gradation and different relative densities were performed under different confining pressure. The effects of relative density on strength behavior were investigated. The experimental results indicate that the relative density and confining stress of the sample show a positive correlation with its peak intensity. With the increase of relative density and confining stress, the peak intensity is increased and a functional relationship between them is established. With the same confining stress, the failure deviatoric stress ratio increases with the increasing of relative density at different degrees, and the growth trend is not obvious under high confining stress. The relationship between nonlinear strength parameters and relative density of the sample is approximately linear.