Numerical Modeling of Geomembranes
SoilVision Systems Ltd. is pleased to announce the addition of internal boundary conditions which can be used to represent geomembrane materials. The new feature was implemented in response to requests from customers and represents a significant improvement for the numerical modeling of a number of different scenarios involving geomembranes. More specifically, the geomembrane internal boundary condition is ideal for the modeling of containment ponds, landfills, mine tailings areas, and cover designs which include geomembranes.
Geomembranes typically have a low permeability relative to the surrounding earth material. Flow across these geomembranes over wide areas or over long times can be significant and often must be accounted for in a numerical model.
Geomembranes can also be modeled in SVFlux by defining a thin region and assigning a material to it with the properties of a geomembrane, but by using the Geomembrane boundary condition it is possible to realize significant solution time savings due to the decrease in required nodes.
Geomembrane boundary condition
Create a new teaching environment with SVOffice Elite for classrooms. Over 500 example models are included with SVOffice! Contact us and ask about the special on our network-based 10-user software suite.
Modeling the Behaviour of Unsaturated, Saline Clay for Geotechnical Design
In recent times, there has been much discussion regarding the use of unsaturated soil mechanics for the design of earth retaining structures in Adelaide's semi-arid conditions. The soil-water characteristic curve (SWCC) is the main design tool within this field as a means to incorporate the additional shear strength associated with total soil suction. However, the majority of research to date only incorporates matric suction. This paper attempts to adopt the total suction profile to more effectively capture the behaviour of saline clays in Adelaide as osmotic suction is the dominant component of total suction. Furthermore, this research also considers clay soil behaviour, climatic effects over a 120 year period and identifications of worse-case-scenarios in order to increase design efficiency. Previously published results were verified using the recently developed software SVOffice 2009, created by SoilVision Systems Ltd., and an analysis of the Millswood underpass was conducted. This paper (PDF) confirms the relationship of total soil suction to strength of Adelaide clay known to design practitioners yet still not used in design. These results will pave the way for further research in order to improve the way retaining structures are built on Adelaide clays.
Source: Modeling the Behaviour of Unsaturated Saline Clay for Geotechnical Design, Evan W. Jones, Yih H. Koh, Bradley J. Tiver, Marcus A. H. Wong - Adelaide University Student Project, 2009