Structuration of natural muds in a rheological point of view.

This paper discusses the filling of estuary problem which can be defined as the accumulation of fine materials that causes the invasion of muds all over the estuary and that has a direct effect on the fauna and flora in the river, fishing, swimming and the beauty of the landscapes. All this consequences have social, environmental and economic impact. In the context of the study of this phenomena, analysis of the structuration mechanisms of sedimentary materials in estuaries is carried out in order to better understand the fillings estuarine areas and specially to consider sustainable solutions of “cleansing” of these areas. The Rance estuary is particularly targeted by the study. The aim is to provide answers on the rheological behavior of natural vessels by distinguishing the most significant scales to detect structural factors influencing the rheological parameters

Upper bound seismic limit analysis of geosynthetic-reinforced unsaturated soil walls

International audienc

Seismic analysis of geosynthetic-reinforced retaining wall in cohesive soils

International audienc

Reliability analysis for internal seismic stability of geosynthetic-reinforced soil walls

International audienceA reliable design of geotechnical structures requires an appropriate estimation and consideration of the parameter's uncertainties. Traditional design codes account for the uncertainties by using conservative factors. This paper presents a reliability-based analysis of the seismic internal stability of geosynthetic reinforced earth retaining walls. The deterministic computation of the structure safety factor is based on the upper bound theorem of limit analysis. The discretization technique is used to generate the rotational failure mechanism so that the seismic loading can be implemented by the pseudo-dynamic approach. The considered uncertainties involve the soil shear strength parameters, seismic loading and reinforcement strength parameters. The Sparse Polynomial Chaos Expansion combined with Monte Carlo Simulation is the reliability method considered to carry out the probabilistic analysis. The influence of the correlation between the soil parameters and the random variables distribution type on the probabilistic results are investigated and discussed. A global sensitivity analysis is performed in order to specify the contribution of each random variable to the reinforced earth retaining wall safety factor

Structuration of natural muds in a rheological point of view.

This paper discusses the filling of estuary problem which can be defined as the accumulation of fine materials that causes the invasion of muds all over the estuary and that has a direct effect on the fauna and flora in the river, fishing, swimming and the beauty of the landscapes. All this consequences have social, environmental and economic impact. In the context of the study of this phenomena, analysis of the structuration mechanisms of sedimentary materials in estuaries is carried out in order to better understand the fillings estuarine areas and specially to consider sustainable solutions of “cleansing” of these areas. The Rance estuary is particularly targeted by the study. The aim is to provide answers on the rheological behavior of natural vessels by distinguishing the most significant scales to detect structural factors influencing the rheological parameters

Effect of the properties of the masonry buildings on their allowable settlements

International audienceThe objective of this paper is to study the effect of the geometrical and mechanical properties of the masonry buildings on the allowable values of their deflection, in order to assess their damage category. Presented in this paper is a parametric study performed using an analytical method that computes the deflection of the building, to assess its damage. This analytical method models the building as an equivalent simply supported beam under its own weight. The beam is subjected to a deflection that represents the differential settlement. The used analytical method permits to determine a relation between the maximal extensive strain value in the structure and its deflection ratio relative to the building properties. The sensibility analysis presented herein shows the effect of the building properties (geometry, stiffness, position of the neutral axis in the beam) on the thresholds of the deflection ratio used to assess damage. Results show that the thresholds of the deflection ratio of the masonry building can change relative to its properties. Results show a range of variation of this ratio associated to different damage categories

Investigation into the Effect of Replacing Natural Sand by Normalized Crushed Sand on Concrete Performance

International audienc