Modeling granular soils liquefaction using coupled lattice Boltzmann method and discrete element method |
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| Institution: | 1. WSP|Parsons Brinckerhoff, NY, USA;2. Rensselaer Polytechnic Institute, Troy, NY, USA;1. Department of Hydraulic Engineering, State Key Laboratory of Hydroscience and Engineering, National Engineering Laboratory for Green and Safe Construction Technology in Urban Rail Transit, Tsinghua University, Beijing, 100084, China;2. Atmospheric, Earth, and Energy Division, Lawrence Livermore National Laboratory, Livermore, CA, 94551, USA;3. Department of Civil and Environmental Engineering, University of California, Davis, CA, 95616, USA;4. Department of Mechanics, School of Applied Mathematical and Physical Sciences, National Technical University of Athens, Greece;1. Department of Structural Engineering, University of California San Diego, 9500 Gilman Drive #0412, La Jolla, CA 92093-0412, USA;2. Department of Civil and Environmental Engineering, Colorado School of Mines, 1610 Illinois St., Golden, CO 80401, USA;3. Department of Geosciences, University of Oslo, Blindern, Oslo, Norway;1. Heat and Mass Transfer Technological Center, Technical University of Catalonia, Terrassa 08222, Spain;2. School of Mechanical Engineering in Xiangtan University, Hunan 411105, China;3. School of Mathematics and Computational Science in Xiangtan University, Hunan 411105, China;4. School of Civil Engineering, University of Leeds, Leeds LS2 9JT, UK |
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| Abstract: | In this paper, a novel coupled pore-scale model of pore-fluid interacting with discrete particles is presented for modeling liquefaction of saturated granular soil. A microscale idealization of the solid phase is achieved using the discrete element method (DEM) while the fluid phase is modeled at a pore-scale using the lattice Boltzmann method (LBM). The fluid forces applied on the particles are calculated based on the momentum exchange between the fluid and particles. The presented model is based on a first principles formulation in which pore-pressure develops due to actual changes in pore space as particles? rearrangement occurs during shaking. The proposed approach is used to model the response of a saturated soil deposit subjected to low and large amplitude seismic excitations. Results of conducted simulations show that at low amplitude shaking, the input motion propagates following the theory of wave propagation in elastic solids. The deposit response to the strong input motion indicates that liquefaction took place and it was due to reduction in void space during shaking that led to buildup in pore-fluid pressure. Soil liquefaction was associated with soil stiffness degradation and significant loss of interparticle contacts. Simulation results also indicate that the level of shaking-induced shear strains and associated volumetric strains play a major role in the onset of liquefaction and the rate of pore-pressure buildup. |
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| Keywords: | Soil liquefaction Saturated granular soil Discrete element method Lattice Boltzmann method |
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