active earth pressure in cohesive-frictional soils using fem and optimization

Authors

p. hamidi

t. akhlaghi

m. hajialilou bonab

abstract

calculation of lateral earth pressure on retaining walls is one of the main issues in geotechnics. the upper and lower bound theorems of plasticity are used to analyze the stability of geotechnical structures include bearing capacity of foundations, lateral earth pressure on retaining walls and factor of safety of slopes. in this paper formulation of finite element limit analysis is introduced to determine plastic limit load in the perfect plastic materials. elements with linear strain rates, which are used in the formulation, cause to eliminate the necessity of velocity discontinuities between the elements. using non-linear programming based on second order cone programming (socp), which has good conformity with cone yield functions such as mohr-coulomb and drucker-prager, is another important advantage that remove the problem of using ordinary linear programming algorithms for yield functions such as divergent in the apexes. finally, the optimization problem will be solved by mathematical method. the proposed method is used for calculating active earth pressure on retaining walls in cohesive-frictional soils. according to results of analysis, active earth force on retaining wall is decreased by increasing soil cohesion, wall inclination friction angle between backfill and wall and friction angle of soil wherein the force is increased by increasing surcharge on the backfill and the backfill slope. mathematical method is used for obtaining accurate results in this research, however, heuristic methods are used when approximate solutions are sufficient.

Upgrade to premium to download articles

Sign up to access the full text

Already have an account?login

similar resources

ACTIVE EARTH PRESSURE IN COHESIVE-FRICTIONAL SOILS USING FEM AND OPTIMIZATION

Calculation of lateral earth pressure on retaining walls is one of the main issues in geotechnics. The upper and lower bound theorems of plasticity are used to analyze the stability of geotechnical structures include bearing capacity of foundations, lateral earth pressure on retaining walls and factor of safety of slopes. In this paper formulation of finite element limit analysis is introduced ...

full text

research note›› determination of active earth pressure for reinforced retaining walls in c-) soils

abstract the prediction of active earth pressures is essential to the design of retaining walls in case of reinforced and unreinforced soils. in this study, a new analytical method is presented to determine the coefficient of earth pressure. the horizontal slice method is used to compute the active earth pressure behind a rigid retaining wall in consideration of the granular soils. to verify th...

full text

Stability of anchored sheet wall in cohesive-frictional soils by FE limit analysis

This study extends the limit analysis techniques used for the computation of strict bounds of the load factors in solids to stability problems with interfaces, anchors and joints. The cases considered include the pull-out capacity of multibelled anchors and the stability of retaining walls for multiple conditions at the anchor/soil and wall/soil interfaces. Three types of wall supports are exam...

full text

Shakedown of Cohesive-frictional Non-homogeneous Soils under Moving Surface Loads

ABSTRACT: In this paper, shakedown limits of non-homogeneous soils in a half-space under rolling and sliding surface loads are investigated. The inhomogeneity of the soil is described by a power law for the variation of Young’s modulus with the depth. Mohr-Coulomb criterion is employed to characterise the cohesive-frictional behaviour of the soil. Analytical solutions to the elastic stress fiel...

full text

Cohesive, frictional powders: contact models for tension

The contacts between cohesive, frictional particles with sizes in the range 0.1–10μm are the subject of this study. Discrete element model (DEM) simulations rely on realistic contact force models—however, too much details make both implementation and interpretation prohibitively difficult. A rather simple, objective contact model is presented, involving the physical properties of elastic–plasti...

full text

Evolution of swelling pressure of cohesive- frictional, rough and elasto-plastic granulates

The subject of this study is the modeling of the evolution of the swelling pressure of granulates with cohesive-frictional, rough and elasto-plastic “microscopic” contact properties. The spherical particles are randomly arranged in a periodic cubic space with a fixed volume so that an increase of the particle size – i.e. swelling that can be caused by intake of some fluid – is accompanied by a ...

full text

My Resources

Save resource for easier access later


Journal title:
international journal of optimaization in civil engineering

جلد ۷، شماره ۲، صفحات ۲۵۷-۲۶۷

Hosted on Doprax cloud platform doprax.com

copyright © 2015-2023