主应力轴旋转对压实黄土动残余变形的影响

Effect of Principal Stress Axle Rotation to Dynamic Residual Deformation of Compacted Loess

通过对DTC-199型周期扭转荷载三轴仪的简单改造,研究了主应力轴旋转对压实黄土在周期动荷载作用下轴向残余变形和动剪切残余变形的影响。结果表明:随着初始主应力方向角的增大,轴向残余变形由压缩状态的正值逐渐过渡到伸长状态的负值。振动次数对剪切残余变形影响较大,剪切变形随振次的增多而增加,且随初始主应力方向角的增大呈现增大的趋势。

After simply remade DTC-199 cyclic torsional load triaxial apparatus,the effect of principal stress axle rotation to axial residual deformation and dynamic shear residual deformation of compacted loess with cyclic dynamic load is researched.The results show that： with the initial principal stress direction angle increases,the axial residual deformation from the compression state gradually transits to the elongation.The vibration times has significant impact on the shear residual deformation.Shear deformation increases with the vibration times increases and shows an increasing tendency as the initial principal stress direction increases.