Effect of Fiber Content on Shear Characteristics of Granite Residual Soil
FU Dongping
ZHANG Hong
LIN Chunxiu
ZHANG Xinya
Abstract：In order to investigate the shear characteristics of the residual soil under different fiber content,direct shear tests were carried out on the residual soil by using pneumatic direct shear apparatus.Considering fiber content,shear rate,vertical stress and other factors,the effect of fiber content on the shear characteristics of residual soil under different shear rates and vertical stresses is analyzed.The test results show that when the vertical stress is 300 kPa,compared with the undoped fiber,with the fiber content increase from 0 to 0.3%,0.6%and 0.9%,shear strength increases by 23%,46.1%and 79.2%,respectively,that is,the addition of fiber has a significant enhancement effect on the shear strength of granite residual soil.The internal friction angle increases with the increase of fiber content,and the cohesion decreases significantly with the increase of fiber content.Under low vertical stress,the soil is first dilatational and then shrunken,and under high vertical stress,the soil is shrunken constantly.In the case of low-speed shear,the shear rate has little effect on the shear strength characteristics of granite residual soil.The degree of shear expansion increases with increasing shear rate.
Keywords：Fiber reinforced soilPolypropylene fiberInterface between geogrid and soilDirect shear testShear strength
Publication Date：2024-03-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 165-174 )