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Slope Stability Evaluations by Limit Equilibrium and Finite Element Methods Applied to a Railway in the Moroccan Rif

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Open Journal of Civil Engineering 2012年第1期2卷 27-32页

作者： Khadija Baba Lahcen Bahi Latifa Ouadif ahmed akhssas 3GIE Laboratory Mohammadia Engineering School Mohammed V-Agdal University Rabat Morocco

Since 1930, the analysis of slope stability is done according to the limit equilibrium approach. Several methods were developed of which certain remain applicable because of their simplicity. However, major disadvantages of these methods are (1) they do not take into account the soil behavior and (2) the complex cases cannot be studied with precision. The use of the finite elements in calculations of stability has to overcome the weakness of the traditional methods. An analysis of stability was applied to a slope, of complex geometry, composed of alternating sandstone and marls using finite elements and limit equilibrium methods. The calculation of the safety factors did not note any significant difference between the two approaches. Various calculations carried out illustrate perfectly benefits that can be gained from modeling the behavior by the finite elements method. In the finite elements analysis, the shape of deformations localization in the slope is nearly circular and confirms the shape of the failure line which constitutes the basic assumption of the analytical methods. The integration of the constitutive laws of soils and the use of field’s results tests in finite elements models predict the failure mode, to better approach the real behavior of slope soil formations and to optimize its reinforcement.

关键词： Conventional Methods Finite Elements Safety Factor Slopes Stability

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Geophysics Contribution for the Determination of Aquifers with a Case Study

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International Journal of Geosciences 2012年第1期3卷 117-125页

作者： Latifa Ouadif Lahcen Bahi ahmed akhssas Khadija Baba Med Menzhi 3GE Laboratory Mohammadia Engineering School Mohammed V Agdal University Rabat Morocco

The determination and monitoring of aquifer formations on the eastern border of Moroccan Gharb basin are very difficult because of their spatial and temporal variation. To delimit these formations, a geophysical survey of 52 geoelectric soundings was performed with a mesh of 500 m and electrodes distance between 1000 m and 3000 m. Geoelectric sections and resistivity maps show a horst and graben structure. The correlation of existing oil drillings shows that the Jurassic and Neogene formations are both affected by normal faults causing Jurassic deposits collapse with local thickening of the Miocene deposits, and reverse faults delimiting tectonic slices due to tension caused by prerifaine nappe advance. This fact confirms the generated structure by the resistivity method. The isobath map of resistant formations's roof show average depths extending from 400 to 800 m for calcareous sandstone that are potential aquifers while oil drillings indicate over 1000 m depths.

关键词： Aquifer Prerifaine Nappe Resistivity Method Geophysical Survey Gharb Basin

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