干密度对重塑红黏土变形特性的影响

摘要

为研究不同干密度下红黏土剪切变形特性，采用人工方法制备不同干密度的红黏土试样，进行了重塑红黏土的不排水三轴剪切试验。研究结果表明：饱和重塑红黏土随干密度的增加应力－应变曲线表现出4种不同类型，由弱塑性类型依次向硬化性、强塑性、软化性类型发展，剪切峰值提高；微观孔隙的平均孔径逐渐减小，微观结构从粒斑状结构发展至叠片状，在高干密度情况出现剪切带；分别对不同应力－应变曲线类型进行拟合分析，并讨论了各种曲线类型的数学模型的适用性。%In order to study the effects of dry density on red clay deformation characteristics,remolded red clay samples at different dry density levels are made in undrained triaxial tests.Results show that the stress-strain curves of saturated remolded red clay exhibited four different types with the increase of dry density.Curves de-veloped from weak plastic type towards softening type,and the shearing strength increased.The average pore size of microscopic pores decreases with dry density increasing,and the microstructure developed from granule status to lamination status,the shearing band appeared at high dry density.Different types curves are matched and analyzed,and the applicability of mathematical model about different types curves are discussed.