非饱和黄土静、动强度及其相关性研究

Research on Static and Dynamic Strength of Unsaturated Loess and the Correlation between Them

通过静三轴试验和动扭剪试验研究了非饱和黄土的静、动强度特性,对非饱和土的有效应力计算公式以及动扭剪试验Mohr-Coulomb强度指标的整理进行了讨论,提出了非饱和黄土和饱和黄土的有效应力计算的简化公式。分析了原状黄土和重塑黄土静强度指标随含水量、密度变化的规律,以及动强度指标随含水量、破坏振次变化的规律。研究了黄土静、动强度指标之间的相关性,黄土的静力强度指标与破坏振次为20次时的动力有效强度指标很接近。静、动强度指标之间有很强的相关性,提出了用黄土的静力强度指标推求相应的动力强度指标的经验公式。

The characteristics of static and dynamic strength of unsaturated loess are studied by triaxial compression test and dynamic torsional shear test, and the formulas for calculating effective stress of unsaturated loess and the method of Mohr-Coulomb strength index calculation in dynamic torsional shear test are also discussed. Simplified formulas for the effective stress calculation of unsaturated loess unsaturated loess are proposed. The rules that static strength of intact loess and man-made loess change with water content and density and dynamic strength changes with water content and vibration number are also analyzed. The relativity of strength index between static and dynamic test of loess is analyzed. The static strength index approach to the dynamic strength index at vibration number 20. The correlation of strength index between static and dynamic test of unsaturated loess is remarkable, and some experience formulas of ascertaining dynamic strength index according to static strength index are presented.