Shiraz UniversityIranian Journal of Science and Technology Transactions of Civil Engineering2228-616030120060224Discrete element method analysis of retaining wall earth pressure in static and pseudo-static conditions14515077010.22099/ijstc.2006.770ENJournal Article20040101Static and pseudo-static analysis based on the Discrete Element Method (DEM) is presented for active and passive earth pressure distribution behind a retaining wall. Soil mass in the present model is treated as comprising blocks which are connected by elasto-plastic Winkler- springs. The solution of this method satisfies all equilibrium and compatibility conditions. Examples are shown to demonstrate the applicability of the method for analyses of earth pressure behind a gravity wall, including pseudo-static pressure of earth and lateral pressure of non-homogeneous soil. The applicability of DEM for analyses of reinforced soil structures and the advantages of this method over the conventional limit equilibrium method are also discussed.
Shiraz UniversityIranian Journal of Science and Technology Transactions of Civil Engineering2228-616030120060224Numerical solution and hydrodynamics of grout
propagation in porous media15115577110.22099/ijstc.2006.771ENJournal Article20040412A new approach to <em>modeling injecting domain</em>has been developed based on changing permeability coefficient in a certain form in theory of consolidation. The proposed model utilizes the variation of the coefficient of permeability with respect to the pore fluid pressure justifying flow characteristic below certain hydraulic gradients and void volume changes. A proposed numerical solution for heterogeneity of media with regards to the permeability coefficient also leads the results to a better grout extension solution. The potential of the proposed model is evaluated in predicting the propagation of grouting material due to a single injection bore hole. The general comparison indicates that this approach is capable of solving the injection boundary value problem.