Active and Passive Earth Pressure Acting on Smooth Circular Shafts Using Numerical Approach

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Several researchers have studied the lateral earth pressures acting on the vertical, rigid and circular shaft using experimental, theoretical and numerical methods of analysis. In this study, a new retaining wall model under axisymmetric conditions with outward pressure is considered and can be widely used in the design of grain silos, buildings and road construction. This paper presents a detailed evolution of the distribution of earth pressure on a smooth cylindrical wall filled with granular material and subjected to radial displacement by using the computer code FLAC-2D. Apart from the axisymmetric retaining wall, the analysis covered a wall under plane strain condition.

A parametric study is carried out to evaluate the distribution of the active and passive pressure on the wall as a function of the radius, the friction angle of the granular material. The numerical study found that: Firstly, for the outward wall, increasing (r) has no effect on the active and passive earth pressures coefficients and is similar to plane strain conditions, secondly has no effect on the active and passive earth pressures coefficients and is similar to plane strain conditions, for the inward wall, increasing (r) has a fully clear effect on the active and passive earth pressures coefficients and is similar to plane strain conditions when r/f =33.33.  Numerical results are discussed and compared with recent experimental results and theoretical solutions. This study helps to know the difference between the two models (outward and inward mechanisms) and to know when to apply the two methods (axisymmetric and plane strain) when studying the lateral earth pressures acting on the vertical, rigid and circular shaft.

18th African Regional Conference on Soil Mechanics and Geotechnical Engineering (ARCSMGE2024)

Behavior of soils, analysis and modeling