RESEARCH ON THE SHEAR STRENGTH OF STRAW FIBER IMPROVED SOIL UNDER THE CONDITION OF FREEZE-THAW CYCLE
This paper studies the shear strength of soil improved by rice straw fiber under freeze-thaw condition,in which the rice straw fiber with different fiber length and content was added into the plain soil to analyze the shear strength and freeze-thaw resistance.The results show that the improvement effectivenessis significant when the fiber ratio was 9 mm in length and 0.6%in content.After freezing-thawing cycles,the cohesionexponentially decreases with the increase of freezing-thawing cycles,and decreases significantly in the first three freezing-thawing cycles.The internal friction angle of reinforced soil decreases with the increase of freezing-thawing cycles,but the internal friction angle changes little with the increase of freezing-thawing cycles.The conclusions may provide theoretical guidance for the application of fiber improved soil in practicalengineering.
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