Study on the influence of polypropylene fibers on triaxial compression properties of aeolian sand modified soil
To study the effect and mechanism of polypropylene fibers in reinforcing aeolian sand modified soil(95％aeolian sand+5％cement)and to improve the brittle failure properties of aeolian sand modified soil,polypropylene fibers were divided into 0.1％,0.2％and 0.4％by mass percentage and perspectively incorporated into the aeolian sand modified soil.A consolidated undrained(CU)triaxial compression test was conducted.The test results show that the stress-strain curve of the aeolian sand modified soil has the characteristics of elastic-plastic deformation.The initial phase is pore compression with a sudden stress increase followed by a complete elastic phase,a phase of plastic deformation,and a phase of failure after the contact phase.The incorporation of propylene fibers increases the plastic deformation of the soil sample and improves the residual strength.The fracture surface becomes arc-shaped due to the pulling and tugging of the fibers,which prevents the brittle failure of the soil sample and increases its ductility.The cohesion of aeolian sand modified soil increases with the increase of fiber content,which basically shows a linear positive correlation,and the internal friction angle decreases with the increase of polypropylene fiber content and shows an overall linear negative correlation.The peak strain increases with the increase of polypropylene fiber content,and the stress-strain curve changes from strain softening type to strain hardening type,which can be effectively fitted by a hyperbola.The parameter b of stress-strain hyperbolic fitting model under the same confining pressure decreases with the increase of polypropylene fiber content.The research results can provide an experimental reference for the practical engineering application of aeolian sand modified soil.
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