观察到垃圾土的轴向应变超过30 %而其主应力差仍然在增长。
Although the value of axial strain of refuse exceeds 30 %, the phenomenon of the increase of the principal stress difference is observed.
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。
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.
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