Creep law and model prediction of fiber-reinforced expansive soil
Expansive soil is a disastrous soil with rheological properties,and its creep behavior directly affects the stability and safety of engineering structures.To investigate the creep characteristics and stress-strain mathematical model of sisal fiber-reinforced expansive soil,the creep characteristics of ex-pansive soil and sisal fiber-reinforced expansive soil under different water content,confining pressure,and deviator stress conditions were studied using laboratory triaxial creep test of consolidated drainage,and a modified creep model of sisal fiber-reinforced expansive soil based on Mesri creep empirical model was proposed with the creep characteristic curves in view.The results show that under the same conditions,the creep deformation of sisal fiber-reinforced soil is significantly smaller than that of soil without being reinforced,indicating that adding sisal fiber can effectively improve the structural per-formance and deformation resistance of expansive soil.The creep deformation of soil without being rein-forced and reinforced-soil increases with the increase of water content,while decreases with the in-crease of confining pressure.Both soils could generate instantaneous strain and creep deformation when subjected to deviatoric stress,and their creep deformation increases with the increase of deviatoric stress.The creep curves of plain soil and reinforced-soil are divided into four stages,elastic deformation stage,steady creep stage,attenuation creep stage and accelerated creep stage.Under high deviational stress,the creep prediction error of sisal fiber-reinforced soil based on traditional Mesri creep empirical model is as high as 37.95％.By modifying the Mesri creep empirical model,the prediction error decreases to within 1.5％,indicating that the modified model can better present the creep characteristics of sisal fiber-rein-forced soil.The research results can provide theoretical reference for expansive soil engineering.
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