Utili, S. and Nova, R. (2008) Dem analysis of bonded granular geomaterials. International Journal for Numerical and Analytical Methods in Geomechanics, 32 (17). pp. 1997-2031.Full text not available in this repository. (Request a copy from the Strathclyde author)
In this paper, the application of the distinct element method (DEM) to frictional cohesive (c,) geomaterials is described. A new contact bond model based on the Mohr-Coulomb failure criterion has been implemented in PFC2D. According to this model, the bond strength can be clearly divided into two distinct micromechanical contributions: an intergranular friction angle and a cohesive bond force. A parametric analysis, based on several biaxial tests, has been run to validate the proposed model and to calibrate the micromechanical parameters. Simple relationships between the macromechanical strength parameters (c,) and the corresponding micromechanical quantities have been obtained so that they can be used to model boundary value problems with the DEM without need of further calibration. As an example application, the evolution of natural cliffs subject to weathering has been studied. Different weathering scenarios have been considered for an initially vertical cliff. Firstly, the case of uniform weathering has been studied. Although unrealistic, this case has been considered in order to validate the DEM approach by comparison against analytical predictions available from limit analysis. Secondly, nonuniform weathering has been studied. The results obtained clearly show that with the DEM it is possible to realistically model boundary value problems of bonded geomaterials, which would be overwhelmingly difficult to do with other numerical techniques.
|Keywords:||distinct element method, bonded geomaterials, cohesive frictional materials, slope stability, Engineering (General). Civil engineering (General), Geotechnical Engineering and Engineering Geology, Mechanics of Materials, Materials Science(all), Computational Mechanics|
|Subjects:||Technology > Engineering (General). Civil engineering (General)|
|Department:||Faculty of Engineering > Civil and Environmental Engineering|
|Depositing user:||Strathprints Administrator|
|Date Deposited:||19 May 2010 13:40|
|Last modified:||12 Aug 2016 02:42|