Computational geomechanics across different scales

Speaker:Ronaldo I. Borja
Department of Civil and Environmental Engineering
Stanford UniversityAbstract
In this seminar I will present the ongoing research work at Stanford University in the area of computational geomechanics spanning different scales. Research currently being undertaken in computational geomechanics dealing with kilometre-scale problems includes numerical simulation of folding and fracturing of sedimentary rock strata using combined elastoplastic-damage continuum theory along with enhanced finite element methods, and simulation of regional-scale fault nucleation and propagation using a finite deformation stick-slip law with a variable coefficient of friction. Research dealing with millimetre-to-meter scale problems focuses on quantifying the effect of spatial density variation on the localization properties of dense sands using a continuum meso-scale simulation technique. Research dealing with micron-scale problems includes theoretical and numerical investigation into the micromechanics of porous media through Lattice-Boltzmann simulations of fluid flow hydrodynamics in porous sandstones. Measurement and calibration are key to a successful development of computational algorithms and numerical models at different scales. LiDAR technology, including laser scanning, GPS, and digital imagery provides high-resolution topographic data to constrain kilometre-scale fold models and decametre-long, centimetre-thickness fractures. At the other end of the spectrum lie the advances of 3D digital imaging of lab specimens using X-Ray computed tomography with micron-scale resolution. Combined with traditional testing of centimetre- and metre-scale lab specimens, I will describe how our numerical models can reach a level of mathematical sophistication commensurate with our ability to measure the relevant response variables.

Location: Kaprielian Hall (KAP) - rielian Hall, Room 203

Audiences: Everyone Is Invited

Contact: Evangeline Reyes