中文摘要：

通过对不同深度红粘土试样进行固结不排水三轴剪切试验，分析红粘土在不同应力状态下应力应变变形，其结果表明：应力峰值出现在应变约2％处；围压越大，其屈服破坏的偏应力值越大，土体抵抗变形的能力越强；不同深度处土层，由应力应变反映出红粘土的固结特性不同；且随着土层深度的增加，红粘土的粘聚力增大，而摩擦角减小。

英文摘要：

Through some consolidation undrain triaxial shear tests on the different depth natural structural red clay samples, it is discussed of red clay stress and strain relation under different stress states. The results show that the maximum stresses arise when strains of soil sample reach about 2%. Deviatoric stress leading to soil yield failure will increase with confining pressure increasing, which can make soil resist bigger distortion. The consolidation character of red clay is different with soil depth increasing. The results are reached by consolidation undrainage triaxial tests of different depth samples that the cohesive forces are increased but the frictional angles are decreased with the soil depth increasing.