Development of Study on Semipermeable Membrane of Clayey Soil

Abstract:

The concept of chemical osmosis is introduced and a short review is given of laboratory apparatuses to measure the osmotic efficiency parameter σ for clayey soils.The values of σ from experiments and the factors affecting the values of σ are presented.The coupled water flux and solute transport models that account for chemical osmosis are elaborated.The results of simulation of fluid and solute transport based on the models and the data from the laboratory experiments are introduced in details.The indication is that the chemical osmotic phenomenon is important for environmental sciences and geotechnical engineering,because osmotic effect can significantly alter the water flow and solute transport for low permeability soil and under chemical environment.The applications of chemicalosmosis phenomena are specified.Clayey soils can be used as both vertical and horizontal contaminant barriers to reduce the contaminant mass flux through the barrier.It is likely to stabilize soft and high activity clays by chemicalosmotic soil stabilization.The possible future advances in chemical osmosis are pointed out.Up to now,the researches of semipermeable membrane of clayey soil have been confined in laboratory.Little investigation in situ was done.And there is little study on GCL and natural soil.