Cours en géotechnique
Il est destiné pour les première année Master.
Entretien de Doctorat à Médéa
Thème du Master 2 demandé pour l'entretien de Doctorat à l'université de Médéa durant l'année 2011-2012
Dr. GADOURI Hamid--CURRICULUM VITAE--
Dr. Hamid GADOURI, Doctor at Yahia Farès University, Medea 26000, Algeria.
Master in Geotechnical Engineering, Djilali Bounaama University Khemis‒Miliana, Ain Defla 44000, Algeria.
Teacher at Yahia Farès University, Discipline of Geotechnical Engineering.
Member in the Research Team of Geomaterials Laboratory of Hassiba Ben Bouali University, Soils Improvement and Modeling, Chlef 02000, Algeria.
Master in Geotechnical Engineering, Djilali Bounaama University Khemis‒Miliana, Ain Defla 44000, Algeria.
Teacher at Yahia Farès University, Discipline of Geotechnical Engineering.
Member in the Research Team of Geomaterials Laboratory of Hassiba Ben Bouali University, Soils Improvement and Modeling, Chlef 02000, Algeria.
Abstract "Ph.D Thesis"
An experimental investigation was conducted in laboratory in order to assess the effects produced by the presence of sodium and calcium sulphates (CaSO4•2H2O, Na2SO4) on Atterberg limits, unconfined compressive strength (UCS) and shear strength of two clayey soils stabilized with the addition of lime (L, 0‒8%), natural pozzolana (NP, 0‒20%) and their combination (L‒NP). Shear and unconfined compression strength tests were carried out on soil samples after 7, 30, 60 and 120 days of curing period.
In the absence of sulphates, the obtained results showed that both clayey soils can be successfully stabilized with the addition of lime alone or in combination with NP. In fact, significant reductions in the plasticity index and substantial increases in UCS and shear strength values were recorded. However, the addition of NP alone to both clayey soils caused a marginal effect on all studied properties.
In the presence of sulphates, at early stage, for any content and any type of sulf
In the absence of sulphates, the obtained results showed that both clayey soils can be successfully stabilized with the addition of lime alone or in combination with NP. In fact, significant reductions in the plasticity index and substantial increases in UCS and shear strength values were recorded. However, the addition of NP alone to both clayey soils caused a marginal effect on all studied properties.
In the presence of sulphates, at early stage, for any content and any type of sulf
Effect of Calcium Sulphate on the Geotechnical Properties of Stabilized Clayey Soils
Abstract
An experimental investigation was undertaken to study the effect of calcium sulphate (CaSO4.2H2O) on the behaviour of the grey clay (GS) and red clay (RS) soils stabilized with lime (L), natural pozzolana (NP) and their combination (L-NP). In this study, the geotechnical properties investigated are respectively,
the Atterberg limits on samples cured for 1 to 30 days to assess the diffusion time effect of CaSO4.2H2O (DTC) in the soil paste and the unconfined compressive strength (UCS) on samples cured for 7 to 120 days. The results show that both GS and RS samples can be successfully stabilized with L alone
or with L-NP which substantially reduce their plasticity index (PI) and increase their UCS. On the other hand, a negligible effect was reported when the NP is used alone. However, when
combining a fraction of CaSO4.2H2O to samples containing L or L-NP, a further decrease in the PI is observed. In addition, higher UCS values are recorded.
Keywords
Clayey soil, lime (L), natur
An experimental investigation was undertaken to study the effect of calcium sulphate (CaSO4.2H2O) on the behaviour of the grey clay (GS) and red clay (RS) soils stabilized with lime (L), natural pozzolana (NP) and their combination (L-NP). In this study, the geotechnical properties investigated are respectively,
the Atterberg limits on samples cured for 1 to 30 days to assess the diffusion time effect of CaSO4.2H2O (DTC) in the soil paste and the unconfined compressive strength (UCS) on samples cured for 7 to 120 days. The results show that both GS and RS samples can be successfully stabilized with L alone
or with L-NP which substantially reduce their plasticity index (PI) and increase their UCS. On the other hand, a negligible effect was reported when the NP is used alone. However, when
combining a fraction of CaSO4.2H2O to samples containing L or L-NP, a further decrease in the PI is observed. In addition, higher UCS values are recorded.
Keywords
Clayey soil, lime (L), natur
Effects of Na2SO4 on the geotechnical properties of clayey soils stabilised with mineral additives
Abstract
An experimental investigation was undertaken to study the effects of sodium sulphate (Na2SO4) on the
behaviour of two clayey soils stabilised with lime (L), natural pozzolana (NP) and their combination (L–NP).
The geotechnical properties investigated are the Atterberg limits and unconfined compressive strength
(UCS) on samples cured for 1–120 days curing period. The results show that the L and L–NP reduce the
plasticity index (PI) and increase the UCS of two clayey soils. However, the PI of these soils increases
when the Na2SO4 is present. In addition, higher UCS values are recorded with 2% Na2SO4. But at later
stage, the samples containing 4 and 6% Na2SO4 were completely deteriorated due to the formation of
ettringite mineral. In general, the effect of Na2SO4 on the soil stabilisation process depends on the type
of additive and its content, the soil nature, the Na2SO4 content and the curing period.
Keywords:
Clayey soil, Natural pozzolana, Lime, Sodium sulphate, Atterbe
An experimental investigation was undertaken to study the effects of sodium sulphate (Na2SO4) on the
behaviour of two clayey soils stabilised with lime (L), natural pozzolana (NP) and their combination (L–NP).
The geotechnical properties investigated are the Atterberg limits and unconfined compressive strength
(UCS) on samples cured for 1–120 days curing period. The results show that the L and L–NP reduce the
plasticity index (PI) and increase the UCS of two clayey soils. However, the PI of these soils increases
when the Na2SO4 is present. In addition, higher UCS values are recorded with 2% Na2SO4. But at later
stage, the samples containing 4 and 6% Na2SO4 were completely deteriorated due to the formation of
ettringite mineral. In general, the effect of Na2SO4 on the soil stabilisation process depends on the type
of additive and its content, the soil nature, the Na2SO4 content and the curing period.
Keywords:
Clayey soil, Natural pozzolana, Lime, Sodium sulphate, Atterbe
Effets du Sulfate de Sodium sur des Sols Argileux Améliorés par des Ajouts Cimentaires
Résumé :
Une investigation expérimentale a été entreprise pour étudier l’effet de la présence du sulfate de sodium (Na2SO4) (0-6% par rapport à la masse du sol sec) sur le traitement de deux sols argileux à savoir un sol gris (SG) et un sol rouge (SR) par l’utilisation de la chaux (L) (0-8%), de la pouzzolane naturelle (PN) (0-20%) et de leur combinaison. Les propriétés ciblées dans cette étude sont, d’une part, les limites d’Atterberg où les échantillons stabilisées ont subit à des temps de cure de 1 à 30 jours pour obtenir une diffusion maximale du Na2SO4 (TDN) dans la masse du sol. Et d’autre part, la détermination de la résistance à la compression simple (RCS) après une durée de cure de 7 à 120 jours. Les résultats obtenus ont montré qu’en absence du Na2SO4, les sols argileux étudiés peuvent être stabilisés avec succès par l’action combinée de la chaux et de la PN. Cependant, la présence du Na2SO4 fait perturber considérablement la p
Une investigation expérimentale a été entreprise pour étudier l’effet de la présence du sulfate de sodium (Na2SO4) (0-6% par rapport à la masse du sol sec) sur le traitement de deux sols argileux à savoir un sol gris (SG) et un sol rouge (SR) par l’utilisation de la chaux (L) (0-8%), de la pouzzolane naturelle (PN) (0-20%) et de leur combinaison. Les propriétés ciblées dans cette étude sont, d’une part, les limites d’Atterberg où les échantillons stabilisées ont subit à des temps de cure de 1 à 30 jours pour obtenir une diffusion maximale du Na2SO4 (TDN) dans la masse du sol. Et d’autre part, la détermination de la résistance à la compression simple (RCS) après une durée de cure de 7 à 120 jours. Les résultats obtenus ont montré qu’en absence du Na2SO4, les sols argileux étudiés peuvent être stabilisés avec succès par l’action combinée de la chaux et de la PN. Cependant, la présence du Na2SO4 fait perturber considérablement la p
Assessment of sulphates effect on the classification of soil–lime–natural pozzolana mixtures based on the Unified Soil Classification System (USCS)
According to the Unified Soil Classification System (USCS), fine-grained soils, such as clays and silts, can be classified by plotting the values of their plasticity index and liquid limit on a plasticity chart. However, soil classification can be affected by mineral additives and sulphates. The effect of both sodium (Na2SO4) and calcium (CaSO4•2H2O) sulphates on the soil classification of soil–natural pozzolana, soil–lime and soil–lime–natural pozzolana mixtures has been studied. The results showed that in the absence of sulphates, the addition of lime and lime‒natural pozzolana to both clayey soils improved considerably their soil classification. However, a negligible change in soil classification was recorded when natural pozzolana was used alone. The presence of sulphates influenced significantly the soil classification of these mixtures, especially with the curing period. The modification in the soil classification was more pronounced with the Na2SO4 than with the CaSO
A comparison study between CaSO4•2H2O and Na2SO4 effects on geotechnical properties of clayey soils stabilised with mineral additives to recommend adequate mixtures as materials for road pavements
Abstract
This paper presents a comparison study between calcium (CaSO4•2H2O) and sodium (Na2SO4) sulphates effects on physico-mechanical properties (pH, plasticity index (PI), unconfined compressive strength (UCS) and shear strength parameters) of both grey and red clayey soils (GS and RS) stabilised with lime (L), natural pozzolana (NP) and their combination (L‒NP) in order to recommend adequate mixtures which can be used as building materials for road pavements. In this study, Atterberg limits, pH, UCS and shear strength tests were carried out after different curing periods (1‒120 days). Tests results showed that the addition of L as an additive produced a high decrease in the PI of both clayey soils but a considerable increase in UCS, cohesion (C), internal friction angle (φ) and pH was recorded, whereas the NP caused a slight effect. However, when combining both additives, a high decrease in the PI and a further increase in other properties were recorded. Moreover, it was fo
This paper presents a comparison study between calcium (CaSO4•2H2O) and sodium (Na2SO4) sulphates effects on physico-mechanical properties (pH, plasticity index (PI), unconfined compressive strength (UCS) and shear strength parameters) of both grey and red clayey soils (GS and RS) stabilised with lime (L), natural pozzolana (NP) and their combination (L‒NP) in order to recommend adequate mixtures which can be used as building materials for road pavements. In this study, Atterberg limits, pH, UCS and shear strength tests were carried out after different curing periods (1‒120 days). Tests results showed that the addition of L as an additive produced a high decrease in the PI of both clayey soils but a considerable increase in UCS, cohesion (C), internal friction angle (φ) and pH was recorded, whereas the NP caused a slight effect. However, when combining both additives, a high decrease in the PI and a further increase in other properties were recorded. Moreover, it was fo
Prediction of geotechnical properties of clayey soils stabilised with lime using Artificial Neural Networks (ANNs)
Abstract
Clayey soils are known as problematic soils for geotechnical engineering since several years. The effect of mineral additives on geotechnical properties of clayey soils has been many times investigated. However, there are a few investigations about the use of Artificial Neural Networks (ANNs) for predicting the geotechnical properties of stabilised soils, all the same, the ANNs can be successfully used in this field. The accurate prediction of plasticity index (PI), maximum dry density (MDD) and optimum moisture content (OMC) is beneficial for the engineering construction to avoid the cumbersome tests in laboratory. The aim of this research is to develop models with good performances based on ANNs, to predict the values of PI, and both parameters of compaction characteristics, the OMC and the MDD of subgrade soil with the addition of lime, using basics soil parameters which always are available for engineers. Three different models are developed which each one corresponds to t
Clayey soils are known as problematic soils for geotechnical engineering since several years. The effect of mineral additives on geotechnical properties of clayey soils has been many times investigated. However, there are a few investigations about the use of Artificial Neural Networks (ANNs) for predicting the geotechnical properties of stabilised soils, all the same, the ANNs can be successfully used in this field. The accurate prediction of plasticity index (PI), maximum dry density (MDD) and optimum moisture content (OMC) is beneficial for the engineering construction to avoid the cumbersome tests in laboratory. The aim of this research is to develop models with good performances based on ANNs, to predict the values of PI, and both parameters of compaction characteristics, the OMC and the MDD of subgrade soil with the addition of lime, using basics soil parameters which always are available for engineers. Three different models are developed which each one corresponds to t
Effect of Sodium Sulphate on the Shear Strength of Clayey Soils Stabilized with Additives
Abstract
The effect of sulphates on the soil stabilization using mineral additives such as lime, cement and fly ash has been reported by several researchers. The effect of sodium sulphate (Na2SO4) (0‒6% by dry weight of soil) on the behaviour of the grey clayey soil (GS) and red clayey soil (RS) stabilized with lime (L) (0‒8%), natural pozzolana (NP) (0‒20%) and with a combination of lime-natural pozzolana (L‒NP) was investigated. The soils specimens were subjected to testing of direct shear strength after 7, 30, 60 and 120 days of curing period. In the absence of Na2SO4, the results show that both clayey soils can be successfully stabilized with L or with a combination of L‒NP which substantially increases their shear strength and produces high values of shear parameters. However, at short curing period and for any content of Na2SO4, a further increase in shear strength and shear parameters is observed. Moreover, after 30 days of curing the RS specimens stabilized with L or
The effect of sulphates on the soil stabilization using mineral additives such as lime, cement and fly ash has been reported by several researchers. The effect of sodium sulphate (Na2SO4) (0‒6% by dry weight of soil) on the behaviour of the grey clayey soil (GS) and red clayey soil (RS) stabilized with lime (L) (0‒8%), natural pozzolana (NP) (0‒20%) and with a combination of lime-natural pozzolana (L‒NP) was investigated. The soils specimens were subjected to testing of direct shear strength after 7, 30, 60 and 120 days of curing period. In the absence of Na2SO4, the results show that both clayey soils can be successfully stabilized with L or with a combination of L‒NP which substantially increases their shear strength and produces high values of shear parameters. However, at short curing period and for any content of Na2SO4, a further increase in shear strength and shear parameters is observed. Moreover, after 30 days of curing the RS specimens stabilized with L or
Assessment of sulphates effect on pH and pozzolanic reactions of Soil‒Lime‒Natural Pozzolana mixtures
Abstract
The geotechnical properties of subgrade soils may need to be enhanced for appropriateness in pavement construction using mineral additives such as cement, lime (L) and fly ash. An experimental investigation was undertaken to study the effects of sodium (Na2SO4) and calcium (CaSO4•2H2O) sulphates on pH and pozzolanic reactions of Soil‒Lime‒Natural Pozzolana (Soil‒L‒NP) mixtures in order to choose an adequate mixture for pavement subgrade soil stabilisation. The pH was measured for different curing periods with and without sulphates. The results showed that increases and decreases in pH values depend on the type of additive and its amount, the type of sulphate and its content, the mineralogical composition of stabilised soil and the curing period. In addition, the pH parameter can be used as an indicator to track the pozzolanic reactions process. On the other hand, clayey subgrade soils can be stabilised with Lime‒Natural Pozzolana (L‒NP) mixtures containing any am
The geotechnical properties of subgrade soils may need to be enhanced for appropriateness in pavement construction using mineral additives such as cement, lime (L) and fly ash. An experimental investigation was undertaken to study the effects of sodium (Na2SO4) and calcium (CaSO4•2H2O) sulphates on pH and pozzolanic reactions of Soil‒Lime‒Natural Pozzolana (Soil‒L‒NP) mixtures in order to choose an adequate mixture for pavement subgrade soil stabilisation. The pH was measured for different curing periods with and without sulphates. The results showed that increases and decreases in pH values depend on the type of additive and its amount, the type of sulphate and its content, the mineralogical composition of stabilised soil and the curing period. In addition, the pH parameter can be used as an indicator to track the pozzolanic reactions process. On the other hand, clayey subgrade soils can be stabilised with Lime‒Natural Pozzolana (L‒NP) mixtures containing any am
(1)-Introduction Générale (Dr. H. Gadouri (2017))
L’objectif principal de ce travail recherche est d’étudier l’influence et les changements apportés par les sulfates (sulfate de calcium hydraté: CaSO4•2H2O et sulfate de sodium anhydre: Na2SO4) connus comme éléments perturbateurs sur les propriétés physico-mécaniques (plasticité, résistance, minéralogie et microstructure) des sols argileux locaux (les deux sol argileux gris (SG) et rouge (SR) utilisés dans cette étude sont de provenance de la région de Chlef) améliorés avec l’addition de différents ajouts minéraux à savoir la chaux (L), la pouzzolane naturelle (PN) et la combinaison de chaux-pouzzolane naturelle (L‒PN). Cette étude va nous permettre de :
• sélectionner les dosages optimaux pour lesquels la résistance mécanique des sols stabilisée est optimale ainsi que le dosage en sulfate à partir duquel le traitement ne sera plus utile à adopter ;
• décrire les mécanismes de stabilisation ;
• analyser les mécanismes de perturbations du
• sélectionner les dosages optimaux pour lesquels la résistance mécanique des sols stabilisée est optimale ainsi que le dosage en sulfate à partir duquel le traitement ne sera plus utile à adopter ;
• décrire les mécanismes de stabilisation ;
• analyser les mécanismes de perturbations du
(2)-Chapitre -1- (Dr. H. Gadouri (2017))
Le premier chapitre : Il est consacré à la présentation de l’état des connaissances actuelles concernant les différentes méthodes d’amélioration et de renforcement des sols instables ou présentant des propriétés insuffisantes en vue de mieux comprendre les principes, les applications et les procédures de conception pour les différentes techniques d’amélioration.
(3)-Chapitre -2- (Dr. H. Gadouri (2017))
Le deuxième chapitre : Il consiste à établir une synthèse bibliographique détaillée afin de se renseigner de l’état d’avancement des recherches dans le domaine de la stabilisation chimique des sols argileux par des liants hydrauliques et des matériaux pouzzolaniques (ciment, chaux, cendres volantes, laitier, fumé de silice, pouzzolane naturelle…etc.). L’analyse de l’effet de ces stabilisants sur le traitement des sols argileux avec ou sans présence des sulfates responsables de l’échec d’un traitement a été mis en évidence.
(4)-Chapitre -3- (Dr. H. Gadouri (2017))
Le troisième chapitre : Il décrit les protocoles expérimentaux, les normes et les procédures suivies pour la préparation et la caractérisation des matériaux sélectionnés. Les propriétés physico-mécaniques, chimiques et minéralogiques des matériaux étudiés ont été déterminées à la base de l’expérience acquise dans les laboratoires des recherches autre que les normes.
(5)-Chapitre -4- (Dr. H. Gadouri (2017))
Le quatrième chapitre : Il présente l’analyse de différents résultats expérimentaux des effets et des changements apportés par les sulfates sur les limites d’Atterberg (limite de liquidité, limite de plasticité et indice de plasticité) des sols argileux stabilisés avec l’addition de la chaux, de la pouzzolane naturelle et de leur combinaison.
(6)-Chapitre -5- (Dr. H. Gadouri (2017))
Le cinquième chapitre : Il est consacré pour l’analyse et la discussion de différents résultats expérimentaux des effets et des changements apportés par les sulfates sur la résistance à la compression non confinée des sols argileux stabilisés avec l’addition de la chaux, de la pouzzolane naturelle et de leur combinaison.
(7)-Chapitre -6- (Dr. H. Gadouri (2017))
Le sixième chapitre : Il présente la discussion de différents résultats expérimentaux des effets et des changements apportés par les sulfates sur la résistance et les paramètres de cisaillement (cohésion et angle de frottement interne) des sols argileux stabilisés avec l’addition de la chaux, de la pouzzolane naturelle et de leur combinaison.
(8)-Conclusions Générales (Dr. H. Gadouri (2017))
Enfin, ce travail de thèse va se terminer par des conclusions générales en rappelant les principaux résultats obtenus ainsi que les recommandations et les perspectives pour de futurs travaux de recherche.
EFFECT OF CaSO4·2H2O ON THE PHYSICO-MECHANICAL PROPERTIES OF STABILIZED CLAYEY SOILS
K. Harichane_ASEC14 (2018)
EFFECT OF CALCIUM SULPHATE ON THE ENGINEERING PROPERTIES OF STABILIZED CLAYEY SOILS
Gadouri et al. (ISCMCE- 2017)
Benefits of Probabilistic Soil-Foundation- Structure Interaction Analysis
Zamila Harichane et el. (2018)
Chap I (Rappel MDS)
Réalisation d'une "Carte Conceptuelle" pour un cours de "Traitement des Sols" destiné pour les 2ème année Master - Géotechnique
Chap II - Pathologies des sols
Réalisation d'une "Carte Conceptuelle" pour un cours de "Traitement des Sols" destiné pour les 2ème année Master - Géotechnique
Chap III - Colonnes ballastées
Réalisation d'une "Carte Conceptuelle" pour un cours de "Traitement des Sols" destiné pour les 2ème année Master - Géotechnique
Chap III - Compactage de surface
Réalisation d'une "Carte Conceptuelle" pour un cours de "Traitement des Sols" destiné pour les 2ème année Master - Géotechnique
Chap III - Consolidation dynamique
Réalisation d'une "Carte Conceptuelle" pour un cours de "Traitement des Sols" destiné pour les 2ème année Master - Géotechnique
Chap III - Le Jet grouting
Réalisation d'une "Carte Conceptuelle" pour un cours de "Traitement des Sols" destiné pour les 2ème année Master - Géotechnique
Chap III - Vibrocompactage
Réalisation d'une "Carte Conceptuelle" pour un cours de "Traitement des Sols" destiné pour les 2ème année Master - Géotechnique
Chap III-TD-01-Compactage de surface
Réalisation d'une "Carte Conceptuelle" pour un cours de "Traitement des Sols" destiné pour les 2ème année Master - Géotechnique
Chap III-TD-02-Compactage Dynamique
Réalisation d'une "Carte Conceptuelle" pour un cours de "Traitement des Sols" destiné pour les 2ème année Master - Géotechnique
Chap IV - Préchargement
Réalisation d'une "Carte Conceptuelle" pour un cours de "Traitement des Sols" destiné pour les 2ème année Master - Géotechnique
Chap IV - Stabilisation Chimiques
Réalisation d'une "Carte Conceptuelle" pour un cours de "Traitement des Sols" destiné pour les 2ème année Master - Géotechnique
Chap IV - Renforcement des terres
Réalisation d'une "Carte Conceptuelle" pour un cours de "Traitement des Sols" destiné pour les 2ème année Master - Géotechnique
Chap IV - Stabilisation Chimiques
Réalisation d'une "Carte Conceptuelle" pour un cours de "Traitement des Sols" destiné pour les 2ème année Master - Géotechnique
Chap VI-TD-04-Stabilisation chimique des sols
Réalisation d'une "Carte Conceptuelle" pour un cours de "Traitement des Sols" destiné pour les 2ème année Master - Géotechnique
Programme (Traitement des sols)
Réalisation d'une "Carte Conceptuelle" pour un cours de "Traitement des Sols" destiné pour les 2ème année Master - Géotechnique
Chap III-TD-03-Colonnes ballastées (Cas Pratique)
Réalisation d'une "Carte Conceptuelle" pour un cours de "Traitement des Sols" destiné pour les 2ème année Master - Géotechnique
Chap VI Autres techniques de stabilisation et de renforcement
Réalisation d'une "Carte Conceptuelle" pour un cours de "Traitement des Sols" destiné pour les 2ème année Master - Géotechnique
Chapitre 1 Les grandes ensembles de la plateforme saharienne
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Chapitre 2 Les cratons en Afrique (Algerie)
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Chapitre 3 La zone de suture CWA-Domaine panafricain (L'Ahnet, de l'Ougarta et de l'Anti Atlas Marocain)
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Chapitre 4 Les grands bassins du Sahara Algérien
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Programme (Géologie de l'Algérie)
Géologie de l'Algérie