辽西黄土的强度特性及应力-应变关系的研究

利用常规应变控制式三轴仪,对辽西地区朝阳—阜新高速公路沿线的黄土进行三轴固结不排水剪切试验。利用拟合方法求取了黄土的强度性质指标,结果表明:辽西黄土的固结不排水剪强度指标值较小;应力-应变关系主要为两类,即应变硬化和应变软化型。在此基础上,构建了黄土应力-应变关系模型,针对应变软化类曲线,文中建议了一个较为适用的经验模型。

STUDY ON SHEAR STRENGTH CHARACTERISTICS AND STRESS-STRAIN RELATIONSHIP OF LOESS IN WEST AREA OF LIAONING

To research the engineering characteristics of Liaoxi loess deeply, using the conventional strain-control triaxial cell to test the loess soil in highway of Fuxin-Chaoyang in west area of Liaoning by consolidated undrained triaxial tests. The indexes of shear strength of loess by are obtained by fitting method. The results show that there is little variability about the indexes of shear strength of Liaoxi loess and two type relationship of stress-strain, that is the type of strain-hardening and the type of strain-softening. On that basis, the stress-strain relationship model is founded and the paper proposes a suitable empirical model about the strain softening curve.