A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Finite Element Mesh Generation for Drainage Geocomposites
Landfill cover systems invariably include a drainage layer which is most often a drainage geocomposite. The drainage design is typically based on either Darcy's Law or a combination of the law with a mass balance analysis as expressed in the "mounding equations". However, these types of analyses do not consider several site conditions including multiple soil types, anisotropy and evapotranspiration. This paper illustrates the use of commercially available finite element software with drainage geocomposites. Simple methods, based on the published equations, were found to provide similar maximum pressure head on the liner as the finite element analysis. The pressure head was found to be very different when more than one material was involved in the drainage. The pressure head distribution along the slope and the variation of the pressure head over time were found to be of practical interest for a practicing design professional. Construction lines, drawn at 1 mm spacing, were used to define the mesh for the drainage geocomposite and a thin soil layer immediately above it. This technique appears to have resolved convergence problems for all the analyses presented in this paper. The software was found to provide an excellent representation of the sharp change in the material properties at the soil-geocomposite interface. A limited sample of conditions analyzed for this paper indicates that the finite element method can be used to solve most landfill cover seepage problems within a few hours of computer time.
Finite Element Mesh Generation for Drainage Geocomposites
Landfill cover systems invariably include a drainage layer which is most often a drainage geocomposite. The drainage design is typically based on either Darcy's Law or a combination of the law with a mass balance analysis as expressed in the "mounding equations". However, these types of analyses do not consider several site conditions including multiple soil types, anisotropy and evapotranspiration. This paper illustrates the use of commercially available finite element software with drainage geocomposites. Simple methods, based on the published equations, were found to provide similar maximum pressure head on the liner as the finite element analysis. The pressure head was found to be very different when more than one material was involved in the drainage. The pressure head distribution along the slope and the variation of the pressure head over time were found to be of practical interest for a practicing design professional. Construction lines, drawn at 1 mm spacing, were used to define the mesh for the drainage geocomposite and a thin soil layer immediately above it. This technique appears to have resolved convergence problems for all the analyses presented in this paper. The software was found to provide an excellent representation of the sharp change in the material properties at the soil-geocomposite interface. A limited sample of conditions analyzed for this paper indicates that the finite element method can be used to solve most landfill cover seepage problems within a few hours of computer time.
Finite Element Mesh Generation for Drainage Geocomposites
Narejo, Dhani (author)
2013
9 Seiten, Bilder, Tabellen, Quellen
Conference paper
Storage medium
English
Drainage Geocomposites in Highway
| British Library Conference Proceedings | 2008
Drainage Geocomposites in Landfill Applications
| British Library Conference Proceedings | 1996
Characteristics and behavior of high drainage geocomposites
| TIBKAT | 1985