Numerical Study of Behavior of Circular Footing on Geogrid-Reinforced Sand Under Static and Dynamic Loading
- 544 Downloads
A series of axi-symmetry models using finite element analyses were performed to investigate the behavior of circular footings over reinforced sand under static and dynamic loading. Geogrid was modeled as an elastic element and the soil was modeled using hardening soil model which use an elasto-plastic hyperbolic stress–strain relation. Several parameters including number of geogrid layers, depth to the first geogrid layer, spacing between layers and load amplitude of dynamic loading are selected in this paper to investigate the influence of these parameters on the performance of reinforced systems under both static and dynamic loads. The numerical studies demonstrated that the presence of geogrid in sand makes the relationship between contact pressure and settlement of reinforced system nearly linear until reaching the failure stage. The rate of footing settlement decreases as the number of loading cycles increases and the optimum values of the depth of first geogrid layer and spacing between layers is found 20% of the footing diameter. Some significant observations on the performance of footing-geogrid systems with change of the values of parametric study are presented in this paper.
KeywordsBearing capacity Circular footing Dynamic loading Geogrid reinforcement Finite element analysis
- Boushehrian JH, Hataf N (2003) Experimental and numerical investigation of the bearing capacity of model circular and ring footings on reinforced sand. Geotext Geomembr 21(4):241–256Google Scholar
- Boushehrian AH, Hataf N, Ghahramani A (2009) Numerical study of cyclic behavior of shallow foundations on sand reinforced with geogrid and grid-anchor. World Acad Sci Eng Technol 58:607–610Google Scholar
- Bringkgreve RBJ, Vermeer PA (1998) PLAXIS—finite element code for soil and rock analyses. Version 8.2 Plaxis BV, The NetherlandsGoogle Scholar
- Lysmer J, Kuhlemeyer RL (1969) Finite dynamic model for infinite media. J Eng Mech Div ASCE, 95(EM4):859–877Google Scholar