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Lotfi Mouni Lazhar Belkhiri Abdelkrim Bouzaza Jean-Claude Bollinger 《Arabian Journal of Geosciences》2017,10(4):77
The chemical associations of Cd, Cu, Pb, and Zn in four mine soil samples from the Amizour-Bejaia Pb/Zn mine (Algeria) have been investigated by a five-step sequential extraction procedure. Although Cd preferentially binds to carbonates, Cu, Pb, and Zn are mainly associated with the organic and reducible fractions. Batch adsorption experiments with either mono- or multi-metallic solutions are described with the Freundlich isotherm model. Whatever the nature of the soil sample, the sorption behavior for each given metal except Pb is very similar, indicating that the binding sites at the soil surface are progressively occupied by the metal from the solution. On each soil sample, the decreasing order of sorption can be established as Pb >> Cu > Cd > Zn. When the four metals are simultaneously applied to each soil sample, their specific behavior is strongly affected by their interactions and/or competition for the available surface sites: we generally observed isotherm curves with a slight maximum before the plateau at higher solution concentration. Although Cu is only slightly affected by the other metals, in the case of Pb, Cd, and Zn, the sorbed amounts strongly decreased. 相似文献
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Lazhar Belabed Hacene Benyaghla Jarir Yahiaoui 《Geotechnical and Geological Engineering》2011,29(4):443-452
The stabilization of slopes by the technique of reinforced earth (Terre Armée) is a very economical and reliable technique.
We propose in this paper to check the overall internal stability of the reinforced earth retaining walls by three mechanical
models, using the analytical method of the limit equilibrium (failure). The main objective of this paper is to compare these
failure mechanical models with the failure models obtained by numerical analysis (code FLAC 2D), in order to validate the
most realistic and more unfavourable failure models. Parametric and comparative studies carried out have allowed us to bring
a very useful knowledge concerning the study of the internal stability of the reinforced earth retaining walls. It also proposed
a theoretical mechanical model of calculation proved by numerical simulation. 相似文献
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Multivariate statistical methods and geochemical modeling were used to assess spatial variation of water quality of the Soummam basin, Algeria. The application of hierarchical cluster analysis (HCA) showed three main groups of samples. Group 1 samples are exclusively composed of surface water. Groups 2 and 3 samples consist of groundwater. Discriminant analysis assigned about 98.6% of the cases grouped by HCA. All groups are super-saturated with Ca-montmorillonite, dolomite, gibbsite, K-mica, kaolinite, and quartz, and all these groups are under-saturated with albite, anhydrite, anorthite, CO2(g), gypsum, halite, melanterite, and smithsonite. The results of analysis of variance indicate that the saturation indices of each of the mineral phases are significant except for chalcedony and quartz (p > 0.05). The results obtained by inverse geochemical modeling show the dissolution of albite, which justifies Na enrichment during the chemical evolution of groundwater. Calcite, dolomite, Ca-montmorillonite, kaolinite, illite, gibbsite, and K-mica are shown to have always precipitated. 相似文献
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Lazhar Belkhiri Abderrahmane Boudoukha Lotfi Mouni Toufik Baouz 《Journal of African Earth Sciences》2011,59(1):140-148
Water analysis data of 54 groundwater samples from 18 uniformly distributed wells were collected during three campaigns (June, September and December 2004). Q-mode hierarchical cluster analysis (HCA) was employed for partitioning the water samples into hydrochemical facies. Interpretation of analytical data showed that the abundance of major ions was identified as follows: Ca ? Mg > Na > K and HCO3 ? Cl > SO4. Three major water facies are suggested by the HCA analysis. The samples from the area were classified as recharge area waters (Ca–Mg–HCO3 water), transition area waters (Mg–Ca–HCO3–Cl water), and discharge area waters (Mg–Ca–Cl–HCO3 water). Inverse geochemical modeling suggests that relatively few phases are required to derive the water chemistry in the area. In a broad sense, the reactions responsible for the hydrochemical evolution in the area fall into two categories: (1) evaporite weathering reactions and (2) precipitation of carbonate minerals. 相似文献
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Bouaicha Foued Dib Hénia Belkhiri Lazhar Manchar Nabil Chabour Nabil 《Journal of the Geological Society of India》2017,89(2):226-226
This paper reports the results of our studies, the chemical analysis of thermal spring’s waters and their geological settings, the use of different statistical methods to evaluate the origin of the dissolved constituents of spring waters and the estimation of the reservoir temperature of the associated geothermal fields of the Guelma region, Algeria. A major component in 13 spring water samples was analyzed using various techniques. The waters of the thermal springs at Guelma basin vary in temperature between 20 and 94oC. Q-mode hierarchical cluster analysis suggests three groups. The water springs were classified as low, moderate and high salinity. Mineral saturation indices (SI) calculated from major ions indicate the spring waters are supersaturated with the most of the carbonate minerals, and all of the spring water samples are under-saturated with evaporite minerals. The thermal spring waters have a meteoric origin, and all samples are immature with strong mixing between warm and shallow waters, where the temperatures of reservoirs to which the thermal waters are related ranged between 64° and 124°C. The deep circulation of meteoric waters in the study area is supplied by the high geothermal gradient around 4.5°C per 100 m and reaches a high temperature before rising to the surface. The estimated circulation depths ranged from 1425 and 3542 m. 相似文献
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Wadi Afara Héouine area (Tahifet, Central Hoggar) is marked by the existence of very diversified lithologies affected by big submeridian accidents, of which Wadi Afara Héouine, who represents a "linear discontinuity" on near 80 km forming a morphological limit which separates, a strongly gneissic domain (Oua Hellèdjène) of a domain with metasedimentary dominant (Aghefsa). Lithologies not described in the former works were defined by the application of specific treatments (color composite, band ratios, and selective PCA). They also allow us to suggest some modifications to the geologic map of Tahifet. Directional filters associated to the previous treatments helped us in the elaboration of lineament map which accentuates the various accidents affecting the region. It seems clearly that treatments applied to the images ETM contribute in an undeniable way to the geologic study of this region especially since a big part of this region is inaccessible 相似文献
7.
Hydrogeochemical data for 18 groundwater samples and 11 hydrochemical parameters were subjected to Q- and R-mode cluster analysis and inverse geochemical modeling. Q-mode cluster analysis resulted in three distinct water types (brackish water type, saline water type and highly saline water type). R-mode cluster analysis led to the conclusion that the water–rock interaction is the major source of contamination for the groundwater in the area. Geochemical modeling results show that carbonates, gypsum, halite, carbon dioxide (gas), and chlorite are dissolving, whereas Ca-montmorillonite, gibbsite, illite, K-mica, kaolinite, and quartz are mostly precipitating along different flow paths in the groundwater system of the area. 相似文献
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