Study on the Shear Strength Characteristics and Reinforcement Mechanism of Palm Fiber Reinforced Soil
In order to address the problem of low shear strength of shallow slope soils,unconsolidated undrained(UU)triaxial tests were carried out on natural palm fiber reinforced soils to study the effect of different combinations of reinforcement conditions on the strength characteristics of soil and its reinforcement mechanism.Different fiber admixtures of 0.35％,0.55％,0.75％,0.95％and fiber lengths of 5 mm,10 mm,20 mm and 30 mm were investigated.The test results showed that mixing palm fiber into powdered clay soil can significantly improve the strength and deformation resistance of the soil.The ultimate principal stress difference reaches maximum for the fiber admixture of 0.75％and the fiber length of 20 mm,with the value increased by 172.9％compared with the plain soil.The internal friction angle is less influenced,with difference within 3°.From the SEM scanning electron microscopy observation of the palm fibers,it is found that the grooves on the surface of palm fibers can increase the interfacial friction and interlocking effect between fibers and soil particles,thereby improving the shear strength indicators of the soil.
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