http://archives.univ-biskra.dz/handle/123456789/24 Thu, 16 Apr 2026 20:01:55 GMT 2026-04-16T20:01:55Z http://archives.univ-biskra.dz/handle/123456789/671 Titre: MODELISATION 3D DU CREUSEMENT DE TUNNEL PAR TUNNELIER A FRONT PRESSURISE VALIDATION SUR LE METRO DE SHANGHAI Auteur(s): DEMAGH, R Résumé: The excavation of shallow tunnels in urban areas requires a previous evaluation of their effects on the existing constructions. In the case of shield tunnel boring machines, the different achieved operations are very complex to represent in a complete numerical simulation. Therefore the assessment of the tunneling-induced soil movements is difficult. In the case of shield tunnel boring machines, the different achieved operations is a highly three-dimensional problem of soil/structure interaction and are very complex to represent in a complete numerical simulation. Therefore the assessment of the tunnelling-induced soil movements is difficult. A three-dimensional simulation procedure, using finite differences code Flac-3D (Fast Lagrangian Analysis of Continua in 3 Dimensions), taking into account in an explicit manner the main sources of movements in the soil mass is proposed. It is illustrated in the particular case of the Yangtze River Tunnel of Shanghai for which experimental data are available and where the crossed soils are saturated and characterised by weak shear strength. The comparison of the numerical simulation results with the in-situ measurements shows that the 3D procedure of simulation proposed is relevant, in particular in the adopted representation for the different operations achieved by the tunnel boring machine (excavation, confining pressure, advancement, installation of the tunnel lining, grouting of the annular void, …). Mon, 30 Dec 2013 00:00:00 GMT http://archives.univ-biskra.dz/handle/123456789/671 2013-12-30T00:00:00Z http://archives.univ-biskra.dz/handle/123456789/670 Titre: HYDROGEOLOGIE D’UN SYSTEME AQUIFERE EN ZONE SEMI-ARIDE.CAS DE LA REGION DE KHENCHELA (ALGERIE) Auteur(s): CHAFFAI, HICHAM; TOUBAL, ABDERRAHMANE; LACROIX, MICHEL; BOUBELLI, SALIM; DJABRI, LARBI Résumé: The hydrology of arid and semi-arid Algeria is a complex subject. Khenchela region, which is affected by chronic drought and climate always negative balance does not justify or clarify the existence of a groundwater recharge. Now this charge, even if limited, often exists in these arid regions where the climate can cause irregularity in some years a few exceptional rainfall events [1, 2, 3, 4]. Three aquifer systems are distinguished in the wilaya of Khenchela: Quaternary, Cretaceous and Miocene. There are four aquifers, one is superficial, it is heterogeneous aquifers and the rest are represented by the deep groundwater aquifer plains of collapse, the web of cracked limestone formations and the water inland. The depth of these aquifers ranges from 5 to 600 m. The total collected from all aquifer is 34 million m3/year [1]. The main objective is to identify the aquifers in the region to establish a database on water training possibilities in the region of Khenchela. Mon, 30 Dec 2013 00:00:00 GMT http://archives.univ-biskra.dz/handle/123456789/670 2013-12-30T00:00:00Z http://archives.univ-biskra.dz/handle/123456789/669 Titre: SIMULATION OF A SOLAR DRIVEN AIR CONDITIONING SYSTEM FOR A HOUSE IN DRY AND HOT CLIMATE OF ALGERIA Auteur(s): DJELLOUL, A; DRAOUI, B; MOUMMI, N Résumé: Solar cooling technology is environmentally friendly and contributes to a significant decrease of the CO2 emissions which cause the green house effect .Currently, most of the solar cooling systems commonly used are the hot water driven lithium bromide absorption chillers. According to the operating temperature of driving thermal source, single – effect Li Br/H2O absorption chillers have the advantage of being powered by ordinary flat-plate or evacuated tubular solar collectors available in the market. The main objective of this work is to develop a computational model that allows the simulation of an hourly basis for an absorption refrigeration - single - effect used the LiBr/H2O as solution working fluid- system assisted by solar energy and natural gas as auxiliary fuel coupled with the residential building located in the hot and dry climate of Algeria. This model will be developed using the dynamic simulation program TRNSYS, considering three specifics areas of work: determination of the cooling loads for a building, implementation of the computational model for the absorption refrigeration system and the parametric optimization of components, which will make possible an approach to optimal sizing of the solar absorption system. The results of the simulation of the absorption chiller indicate that an area of 28 m2 of flat plat collectors with an inclination of 35° and 800 L for hot storage tank provides an annual solar fraction of 80% and a thermal performance coefficient COP of 0.73, getting to cover demand of air conditioning in a house of 120 m2 located in Biskra (Algeria). Mon, 30 Dec 2013 00:00:00 GMT http://archives.univ-biskra.dz/handle/123456789/669 2013-12-30T00:00:00Z http://archives.univ-biskra.dz/handle/123456789/172 Titre: ELIMINATION DU CUIVRE PRESENT DANS LES EAUX USEES INDUSTRIELLES SUR UN FILTRE PLANTE DE TAMARIX Auteur(s): SEGHAIRI, N; MIMECHE, L; DEBABECHE, M; HAMZAOUI, A Résumé: La pollution des eaux usées par les métaux lourds demeure à l’heure actuelle l’un des problèmes majeurs à résoudre dans les pays industrialisés. Divers méthodes classiques sont utilisées pour éliminer les métaux lourds des eaux usées existant. Elles sont basées sur des phénomènes de précipitation chimiques, d’échanges d’ions, de biosorption ou d’adsorption. Le traitement par les plantes (la phytoépuration) consiste à un traitement naturel par une série d’écosystèmes aquatiques ou semi aquatiques organisés et structurés artificiellement de manière à optimiser leur capacité de rétention pour les différents paramètres de pollution. Nombreuses études visent à accroitre le prélèvement des métaux lourds par les plantes pour dépolluer les eaux usées. Mon, 23 Dec 2013 00:00:00 GMT http://archives.univ-biskra.dz/handle/123456789/172 2013-12-23T00:00:00Z