Experimental research on creep properties of composite geomembrane

Creep tests under four-step loading to predict long term creep behavior of composite geomembrane are examined.Based on theoretical analysis,a creep model for composite geomembrane is established,which shows the relationship between creep behavior of composite geomembrane and loading.The creep strain increases with the increase of loading.Under long term tensile dead load,the composite geomembrane presents strong lateral contraction property,and the necking magnitude is proportional to the load.When the material strength remains around 70 % under ultimate load less than 60 %;the material can be seen reliable,it has no influence on structural reliability.