The reinforcement effects of geosynthetics in thick soft subsoil case and thin soft subsoil case are studied in this paper,and a Duncan Chang nonlinear numerical model based on the finite element method (FEM) is developed.Moreover,an important conclusion that the thickness of soft subsoil affects greatly the geotechnical behavior of geosynthetic reinforced embankments is drawn.A series of embankment built on soft subsoil is calculated using the FEM program.The results of the computer program,such as the lateral displacements,settlements,and stress level and shear stresses in the subsoil,are presented in great detail and the comparison of those results disposes clearly the huge discrepancy of reinforce benefit between the thick subsoil embankment and thin subsoil embankment.Reinforcement mechanism of geosynthetics is also discussed in this paper and several conclusions are reached.This paper also gives recommendations for design.
Vapor permeation has potential applications in the separation of organic solvent-water mixtures.Adsorption property of organic vapor influences mainly the membrane selectivity in vapor permeation.The adsorption isotherms of water,acetone, methanol, ethanol and isopropanol vapors on γ -Al 2O 3 membrane were measured by methods of dynamic chromatography.The parameters of the relevant Pickett isotherms were calculated.
