Abstract
The non-uniformity of unit area mass, initial thickness and initial void ratio was investigated for 620 layers of specimens cut from a sheet of non-woven geotextile with 1.0 m wide and 1.5 m long. It was shown that it is possible to predict the distribution of void ratio, which is an important parameter to evaluate permeability of non-woven geotextile, using the distribution of unit area mass. And then, compression test was carried out for 15 specimens extracted by considering the normal distribution of initial void ratio of 620 layers. The confidence interval of void ratio in compression process was calculated by assuming void ratio in every loading pressure is normal distribution. Furthermore, the change in the distribution of void ratio during compression process was visually shown.
