Creep Tension Testing Of Geosynthetic

The creep properties of geogrids are important factors to affect the long-term performance of geogrid reinforced soil structure.The indoor creep test of Geogrid for temperature and different loading conditions were obtained.Through indoor creep test data,a detailed analysis of the creep curve of Geogrid and so on,change characteristics isostrain creep curve and the secant modulus,and calculate the geogrid creep strength and creep strength reduction coefficient by single extrapolation method and time temperature superposition,provide the basis for the analysis and evaluation of the long-term work of geogrid reinforced structure performance.Also through to the geogrid in different unconfined conditions and different load creep tests were conducted ratio conditions,comparative analysis of confined and unconfined creep behavior of geogrid under the condition,and through the single extrapolation coefficient of creep strength under unconfined,think the reduction coefficient is less than that of the conventional no the constraint conditions of creep creep reduction factor of unconfined,established creep strength in practical engineering geogrid HDPE reduction coefficient can be reduced to 2.5-1.5,and provide a reference for the actual construction of the reinforced soil retaining wall.Based on the creep properties of geogrids,analyzes the applicability of the commonly used empirical creep model,in three typical empirical creep model of power function and hyperbolic function fitting is better than the logarithmic function;then based on the logarithmic function to correct the proposed logarithmic function model,fitting this model the creep behavior of geogrid better.Finally,based on viscoelastic plastic theory,the three parameter viscoelastic constitutive model is analyzed.The three parameter viscoelastic constitutive model is suitable for the creep behavior of HDPE unidirectional geogrid under the tension level of 50% and 53%.