Parametric Study of Shallow Tunnel Under Seismic Conditions for Constantine Motorway Tunnel,Algeria     

Aicha  Berkane  Mezhoud  Samy  Tayeb  Bouzid  Toufik  Karech  Abdelkader  Noui 《Geotechnical and Geological Engineering》2022,40(4):2307-2318

Geotechnical and Geological Engineering - When designing tunnels, it is advisable to pre-estimate several tunnel parameters such as the depth (cover), the lining thickness, and the shape of the...  相似文献   

GIS-based multi-criteria land suitability analysis for sustainable agriculture in the northeast area of Tadla plain (Morocco)     

Widad Ennaji  Ahmed Barakat  Mohamed El Baghdadi  Hakima Oumenskou  Mohamed Aadraoui  Lalla Aicha Karroum  Abdessamad Hilali 《Journal of Earth System Science》2018,127(6):79

Assessment of soil suitability for sustainable intensive agriculture is an appropriate tool to select the land suitable for agricultural production with the least economic and environmental costs. This study was conducted to evaluate the agricultural soil quality in the northeast area of Tadla plain (Morocco) using geographic information system (GIS) and analytical hierarchy process (AHP). Six soil quality indicators, i.e., pH, organic carbon, cation exchange capacity, texture, salinity and slope were considered and performed in 60 subsurface soil samples. AHP method was utilized to identify the weight of each indicator from the pairwise comparison matrix. The weighted sum overlay analysis was then used to generate the soil quality map in a GIS environment, by overlaying both indicator weights and sub-indicator weights. The studied area was classified into four soil quality categories, i.e., poor, medium, good, and excellent, the percentage of each category is 1.12, 20.98, 61.07 and 16.83%, respectively. The results indicated that 1.12% of the study area has poor suitability for sustainable intensive agriculture due to their unsuitable texture and low salinity, while about 77% of cultivated soils are adapted to agricultural production. The above results could be useful for the management of agricultural activity.  相似文献   

Numerical Modelling of the Behavior of Tunnel in Soft Surrounding Rock: A Case Study of Djebel El-Ouahch Tunnel,Algeria     

Aicha  Berkane  Mezhoud  Samy 《Geotechnical and Geological Engineering》2021,39(8):5505-5516

The response of a massif to stresses generated by tunnel excavation depends essentially on the geological conditions, the geometry of the tunnel and its underground position. The major problem related to the construction of these structures is to ensure the stability of the whole tunnel-ground, by controlling the various deformation generated during the construction. In this context, the present paper examines the effect of these conditions on the behavior of tunnels and the surrounding soil. The study is applied to a real tunnel, in this case the tunnel of Djebel El Ouahch, Algeria was taken as a reference model. The research includes a parametric study to evaluate the effect of several parameters on the behavior of the tunnel and surrounding soil such as the tunnel anchoring depth, the tunnel-soil interface rate, and the shape of the tunnel cross section. The analysis is performed using the PLAXIS 3D TUNNEL calculation code with an elastoplastic Mohr–coulomb model for the soil behavior. The results show that the strongest and most stable position is the mid-deep tunnel with a circular section, with a non-slip interface between the tunnel and the ground. These outcomes can help to understand the effects of various influences parameters which control the stability of the tunnel in a soil with bad characteristics.

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Analyse du transport solide en suspension dans le bassin versant de l'Oued El Hammam (Algérie du Nord)     

Aicha El Mahi  Mohamed Meddi  Jean Paul Bravard 《水文科学杂志》2013,58(8):1642-1661

Résumé

Dans les régions semi-arides et arides, caractérisées par des précipitations relativement faibles et souvent à caractère torrentiel, les facteurs climatiques jouent un rôle primordial dans l'érosion des sols à l'échelle des versants. La majeure partie de l'exportation des matériaux solides est effectuée par les cours d'eau lors des crues. La présente étude traite de l'évaluation et de la quantification du transport solide dans le bassin versant de l'Oued El Hammam, un sous-bassin important de la Macta caractérisé par une forte érosion hydrique. La sensibilité des roches à l'érosion, l'intensité des précipitations et les perturbations du régime d'écoulement font que le flux des matières en suspension (MES) transportées par l'Oued El Hammam atteint des valeurs très importantes. L'analyse du bilan qui règle le processus pluie–ruissellement–transport solide montre de bonnes relations, notamment entre la lame d'eau écoulée et la quantité de charge solide transportée. Nous présentons des modèles statistiques permettant de reproduire les flux de MES. Après calage et validation des modèles sur les chroniques mesurées, ils sont utilisés afin de reconstituer des chroniques de flux de MES non mesurées, à partir de données historiques de débit et de pluie. L'étude de la relation C–Q à l'échelle de la crue a été modélisée par une fonction puissance Y = aX^b ; une analyse statistique de la constante a et de l'exposant b a été menée afin d'expliquer le comportement de ces deux paramètres et de mieux comprendre l'aspect aussi bien pratique que théorique des processus.

Citation El Mahi, A., Meddi, M., et Bravard, J.-P., 2012. Analyse du transport solide en suspension dans le bassin versant de l'Oued El Hammam (Algérie du Nord). Hydrological Sciences Journal, 57 (8), 1642–1661.  相似文献   

Les granitoı̈des hercyniens post-collisionnels du Maroc oriental : une province magmatique calco-alcaline à shoshonitique     

Hassan El Hadi  Abdelfatah Tahiri  Aicha Reddad 《Comptes Rendus Geoscience》2003,335(13):959-967

The post-collisional Hercynian granitoids crop out in the easternmost part of the Moroccan Hercynian belt. Petrographical and geochemical studies show a composition similarity in the various granitoids. The granitoids belong to per-aluminous and metaluminous magmatic associations. They have evolved according to a scheme similar to high-K calc-alkaline to shoshonitic associations. To cite this article: H. El Hadi et al., C. R. Geoscience 335 (2003).  相似文献