DBPapers
DOI: 10.5593/SGEM2015/B12/S2.070

PORE WATER PRESURE INFLUENCE ON MASSIVE EARTH STRUCTURE

Gelmambet S., Buta C., Mihai G., Gabrieli М.
Friday 7 August 2015 by Libadmin2015

References: 15th International Multidisciplinary Scientific GeoConference SGEM 2015, www.sgem.org, SGEM2015 Conference Proceedings, ISBN 978-619-7105-32-2 / ISSN 1314-2704, June 18-24, 2015, Book1 Vol. 2, 525-532 pp

ABSTRACT
This paper aims to modeling and simulation the behavior of massive earth retention structures saturated with water, the influence of pore water pressure and the negative effects of soil water saturation on them. Increased efforts in a state of earth retention structure usually leads to an increase in pore water pressure, as a direct result of the tendency to reduce the influence of pore volume loading. In soils with low water content or in cases when the increase rate of the pore water pressure in excess, this increase rate can be neglected. If the increase in pore water pressure is maximum corresponds to the case where the soil is fully saturated and drainage is stopped. The paper presents the assumptions on which the analysis is done and equilibrium equations are formulated for saturated porous media taking into account the interaction between the solid and liquid phase. Solving equilibrium equations with discrete finite element models will be made by formulating constitutive behavior laws of solid structure. Finally the results obtained from numerical simulations are analyzed and compared, highlighting the influence of pore water pressure on the behavior of the massive earth retention structures. The earth retention structures are particularly complex structures in terms of mathematical modeling due to different factors such as:
- the diversity of the component materials having different physical and mechanical properties, with nonlinear behavior laws, consisting of water - solid biphasic nature of these materials which further complicates this problem.
- the diversity of load diagrams.
The nature of the materials that make up the body of massive earth structure requires that analyzes must be conducted according to the effective stress in the system. An analysis based on the total effort is not true for less permeable soil material.

Keywords: massive earth structure, water presure, effective stress.