Ph.D., University of Pittsburgh, 2003 - 2006
M.S., University of Pittsburgh, 2001 - 2002
B.S., Universidad de Los Andes, 1997 - 2001
Vallejo, L., & Lobo-Guerrero, S. (2012). The shear strength of granular materials containing dispersed oversized particles: DEM analysis. International Journal of Geotechnical Engineering, 6(3), 371-380.Taylor & Francis. doi: 10.3328/ijge.2012.06.03.371-379.
Lobo-Guerrero, S., & Vallejo, L. (2010). DEM analysis of the effect of granular crushing on the bearing capacity of footings. International Journal of Geotechnical Engineering, 4(3), 351-359.Taylor & Francis. doi: 10.3328/ijge.2010.04.03.351-359.
Lobo-Guerrero, S., & Vallejo, L.E. (2010). The effectiveness of geosynthetic reinforcement, tamping, and stoneblowing of railtrack ballast beds under dynamic loading: DEM analysis. GEOMECHANICS AND ENGINEERING, 2(3), 161-176.Techno-Press. doi: 10.12989/gae.2010.2.3.161.
Lobo-Guerrero, S., & Vallejo, L.E. (2010). Crushing of Particles under Simulated Static and Centrifuge Forces. GeoFlorida 2010, (199), 550-559.American Society of Civil Engineers (ASCE). doi: 10.1061/41095(365)52.
Lobo-Guerrero, S., & Vallejo, L.E. (2010). Fibre-reinforcement of granular materials: DEM visualisation and analysis. Geomechanics and Geoengineering, 5(2), 79-89.Taylor & Francis. doi: 10.1080/17486020903348709.
Vesga, L.F., Vallejo, L.E., & Lobo-Guerrero, S. (2008). DEM analysis of the crack propagation in brittle clays under uniaxial compression tests. INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS, 32(11), 1405-1415.Wiley. doi: 10.1002/nag.665.
Lobo-Guerrero, S., & Vallejo, L.E. (2007). Influence of pile shape and pile interaction on the crushable behavior of granular materials around driven piles: DEM analyses. GRANULAR MATTER, 9(3-4), 241-250.Springer Nature. doi: 10.1007/s10035-007-0037-3.
Lobo-Guerrero, S., & Vallejo, L.E. (2006). Application of Weibull statistics to the tensile strength of rock aggregates. JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING, 132(6), 786-790.American Society of Civil Engineers (ASCE). doi: 10.1061/(ASCE)1090-0241(2006)132:6(786).
Lobo-Guerrero, S., & Vallejo, L.E. (2006). Modeling granular crushing in ring shear tests: Experimental and numerical analyses. SOILS AND FOUNDATIONS, 46(2), 147-157.Elsevier. doi: 10.3208/sandf.46.147.
Lobo-Guerrero, S., & Vallejo, L.E. (2006). Discrete element method analysis of railtrack ballast degradation during cyclic loading. GRANULAR MATTER, 8(3-4), 195-204.Springer Nature. doi: 10.1007/s10035-006-0006-2.
Lobo-Guerrero, S., Vallejo, L.E., & Vesga, L.F. (2006). Visualization of Crushing Evolution in Granular Materials under Compression Using DEM. International Journal of Geomechanics, 6(3), 195-200.American Society of Civil Engineers (ASCE). doi: 10.1061/(asce)1532-3641(2006)6:3(195).
Vallejo, L.E., Lobo-Guerrero, S., & Hammer, K. (2006). Degradation of a Granular Base under a Flexible Pavement: DEM Simulation. International Journal of Geomechanics, 6(6), 435-439.American Society of Civil Engineers (ASCE). doi: 10.1061/(asce)1532-3641(2006)6:6(435).
Lobo-Guerrero, S., & Vallejo, L.E. (2005). Discrete element method evaluation of granular crushing under direct shear test conditions. JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING, 131(10), 1295-1300.American Society of Civil Engineers (ASCE). doi: 10.1061/(ASCE)1090-0241(2005)131:10(1295).
Lobo-Guerrero, S., & Vallejo, L.E. (2005). DEM analysis of crushing around driven piles in granular materials. GEOTECHNIQUE, 55(8), 617-623.ICE publishing. doi: 10.1680/geot.2005.55.8.617.
Lobo-Guerrero, S., & Vallejo, L.E. (2005). Analysis of crushing of granular material under isotropic and biaxial stress conditions. SOILS AND FOUNDATIONS, 45(4), 79-87.The Japanese Geotechnical Society. doi: 10.3208/sandf.45.4_79.
Lobo-Guerrero, S., & Vallejo, L.E. (2005). Crushing a weak granular material: experimental numerical analyses. GEOTECHNIQUE, 55(3), 245-249.Thomas Telford Ltd. doi: 10.1680/geot.55.3.245.61523.
Vallejo, L.E., & Lobo-Guerrero, S. (2005). The elastic moduli of clays with dispersed oversized particles. Engineering Geology, 78(1-2), 163-171. doi: 10.1016/j.enggeo.2004.12.003.
Vallejo, L.E., & Lobo-Guerrero, S. (2005). The elastic moduli of clays with dispersed oversized particles. ENGINEERING GEOLOGY, 78(1-2), 163-171.Elsevier. doi: 10.1016/j.enggeo.2004.12.003.
Vallejo, L.E., Lobo-Guerrero, S., & Chik, Z. (2005). A Network of Fractal Force Chains and Their Effect in Granular Materials under Compression. In Fractals in Engineering. (pp. 67-80).Springer Nature. doi: 10.1007/1-84628-048-6_5.
Vallejo, L.E., Chik, Z., & Lobo-Guerrero, S. (2017). The Effect of Crushing of Unbound Granular Materials Forming Part of Flexible Pavement Systems. In Geotechnical Frontiers 2017, 0(GSP 277), (pp. 424-431).American Society of Civil Engineers (ASCE). doi: 10.1061/9780784480441.044.
Vallejo, L.E., Lobo-Guerrero, S., & Seminsky, L.F. (2014). Shear Strength of Sand-Gravel Mixtures: Laboratory and Theoretical Analysis. In Geo-Congress 2014 Technical Papers, (234 GSP), (pp. 74-83).American Society of Civil Engineers (ASCE). doi: 10.1061/9780784413272.008.
Vallejo, L.E., Lobo-Guerrero, S., Sbarro, C., Liu, Z., & Valdes, J.R. (2014). The constitutive model for unsaturated sands based on thermodynamics. In Geomechanics from Micro to Macro - Proceedings of the TC105 ISSMGE International Symposium on Geomechanics from Micro to Macro, IS-Cambridge 2014, 1, (pp. 728-733).CRC Press. doi: 10.1201/b17395-46.
Vallejo, L.E., Lobo-Guerrero, S., Seminsky, L.F., & Caicedo, B. (2013). The reinforcement of soils by dispersed oversized particles. In 18th International Conference on Soil Mechanics and Geotechnical Engineering: Challenges and Innovations in Geotechnics, ICSMGE 2013, 3, (pp. 2617-2620).
Vallejo, L.E., Lobo-Guerrero, S., Nakagawa, M., & Luding, S. (2009). Fractal Fragmentation of Granular Materials under Compression. In AIP Conference Proceedings, 1145(1), (pp. 847-850).AIP Publishing. doi: 10.1063/1.3180061.
Lobo-Guerrero, S., & Vallejo, L.E. (2006). Influence of Pile Shape on the Crushable Behavior of Granular Materials around Driven Piles: DEM Analysis. In GeoCongress 2006, 2006, (pp. 1-6).American Society of Civil Engineers (ASCE). doi: 10.1061/40803(187)170.
Lobo-Guerrero, S., & Vallejo, L.E. (2006). DEM as an Educational Tool in Geotechnical Engineering. In GeoCongress 2006, 2006, (pp. 1-6).American Society of Civil Engineers (ASCE). doi: 10.1061/40803(187)269.
Lobo-Guerrero, S., & Vallejo, L.E. (2006). The degradation of a simulated ballast bed and the effectiveness of track maintenance techniques. In Proceedings of the 41st U.S. Rock Mechanics Symposium - ARMA's Golden Rocks 2006 - 50 Years of Rock Mechanics, (p. 12 pages).
Vallejo, L.E., & Lobo-Guerrero, S. (2005). Evaluation of porosity changes in a granular material undergoing particle crushing using DEM. In Poromechanics III: Biot Centennial (1905-2005) - Proceedings of the 3rd Biot Conference on Poromechanics, (pp. 573-578).Balkema Press.