Strength Characteristic and Constitutive Model of Fiber Reinforced Core Sample in Cement Soil Mixing Piles
In order to improve the performance of soil-cement mixing pile,basalt fiber was used to modify the core sample.The effects of fiber length,mixing amount and curing time on strength were investigated,and the relationship between fiber strengthening mechanism was discussed.A constitutive model of fiber-reinforced soil-cement mixing pile is optimized based on the piecewise function.The results show that the growth rate of strength decreased with the increase of curing time,and 0-7 days was the rapid growth period.Fiber length has a significant effect on the strength index,and the contribution value of short fiber is the largest.With the increase of fiber content,the strength index increased first and then decreased,and 0.3%was the optimal content.The fiber bridging effect can inhibit the expansion of compression fractures and buffer the failure of samples.The proposed piecewise constitutive model accurately predicts stress-strain re-lationship of fiber reinforced core samples.
cement soil mixing pilefiberstrengthconstitutive model
NETL
NSTL
万方数据
维普
