Mohamed Nabil Houhou - Academia.edu (original) (raw)
Papers by Mohamed Nabil Houhou
Composites Part B: Engineering, 2013
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CRC Press eBooks, May 19, 2014
International audienc
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World Journal of Engineering
Purpose This paper aims to investigate the responses of single piles and pile groups due to tunne... more Purpose This paper aims to investigate the responses of single piles and pile groups due to tunneling-induced ground movements in a two-layered soil system. The analyses mainly focus on the additional single pile responses in terms of bending moment, lateral deflection, axial force, shaft resistance and pile settlement. Subsequently, a series of parametric studies were carried out to better understand the responses of single piles induced by tunneling. To give further understanding regarding the pile groups, a 2 × 2 pile group with two different pile head conditions, namely, free and capped, was considered. Design/methodology/approach Using the PLAXIS three-dimensional (3D) software, a full 3D numerical modeling is performed to investigate the effects of ground movements caused by tunneling on adjacent pile foundations. The numerical model was validated using centrifuge test data found in the literature. The relevance of the 3D model is also judged by comparison with the 2D plane st...
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Archive of Applied Mechanics
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World Journal of Engineering, 2021
Purpose This paper aims to investigate single pile and pile group responses due to deep braced ex... more Purpose This paper aims to investigate single pile and pile group responses due to deep braced excavation-induced soil movement in soft clay overlying dense sand. The analysis focuses first on the response of vertical single pile in terms of induced bending moment, lateral deflection, induced axial force, skin resistance distribution and pile settlement. To better understand the single pile behaviour, a parametric study was carried out. To provide further insights about the response of pile group system, different pile group configurations were considered. Design/methodology/approach Using the explicit finite element code PLAXIS 3 D, a full three-dimensional numerical analysis is carried out to investigate pile responses when performing an adjacent deep braced excavation. The numerical model was validated based on the results of a centrifuge test. The relevance of the 3 D model is also judged by comparison with the 2 D plane strain model using the PLAXIS 2 D code. Findings The resul...
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Infrastructures, 2022
This study describes the results of a series of 2D finite element method (FEM) numerical models o... more This study describes the results of a series of 2D finite element method (FEM) numerical models of 6 m high back-to-back reinforced soil walls using the geotechnical software PLAXIS. These structures are used to support embankments, especially for bridge abutment approaches. The quantitative influence of problem geometry, strip pre-tensioning, strip type, and surcharging on horizontal displacements, development of soil shear and plastic zones, lateral earth pressure, and reinforcement loads is presented. The numerical results demonstrate how this type of reinforced soil walls perform jointly at a certain distance of interaction between the two opposite walls. The walls of the two opposing sides clearly interact with each other when they are close enough and with an overlapping reinforcement layout. Pre-tensioning load can contribute to achieving vertical wall-facing alignment at the end of construction. Using perforated/holed strips, the tensile loads at the end of construction were...
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Journal of Solid Mechanics, 2020
In this research paper, the formulation of a new three-dimensional sector element based on the st... more In this research paper, the formulation of a new three-dimensional sector element based on the strain approach is presented for plate bending problems and linear static analysis of circular structures. The proposed element has the three essential external degrees of freedom (Ur, Vθ and W) at each of the eight corner nodes. The displacements field of the present element is based on assumed functions for the different strains satisfying the compatibility equations. The effectiveness of the present element is applied through several tests related to plate bending problems and linear static analysis of circular structures. The results of the developed element have been compared with analytical and other numerical solutions available in the literature. The obtained results show the excellent performances and precision of the present element. It is found that the new three-dimensional sector element is more accurate and efficient than the three-dimensional classical element based on displ...
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Recent Advances in Geo-Environmental Engineering, Geomechanics and Geotechnics, and Geohazards, 2018
The piled raft (PR) system was developed to use the load-carrying capabilities of both shallow fo... more The piled raft (PR) system was developed to use the load-carrying capabilities of both shallow foundations (rafts) and deep foundations (piles). These components interact with each other through a complex soil-structure interaction scheme. The interaction effects affect the overall load response of PR. In this study, the explicit finite difference code FLAC3D (Fast lagrangian Analyses od Continua) was used to investigate the behavior of PR subjected to vertical loading. Several foundations embedded in soft clay were considered. The results prove that even in the case of soft clay, the load-carrying capacity of the raft and piles, when combined in a PR, becomes different from those of unpiled raft (UR) and group of piles (GP), due to the interactions between raft and piles.
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World Journal of Engineering, 2020
Purpose This paper aims to investigate the pile group efficiency based on the load-settlement res... more Purpose This paper aims to investigate the pile group efficiency based on the load-settlement response in soft clay conditions, considering several pile configurations using a variable number of piles and pile spacing. The overall objective of the present paper is to provide further insight into the mechanical response of the pile group and aim at helping the engineers in taking a logical path in an iterative design process for pile group efficiency. Design/methodology/approach To investigate the pile group efficiency, three-dimensional (3D) numerical simulations were performed using the finite-difference code FLAC3D. Findings The obtained numerical results are validated by comparing them to those of similar subgrade structure and in comparable geological conditions provided within the literature. The results indicated that although the bearing capacity of the pile group increases with increasing number of piles, the efficiency of the pile group is very important for a small number ...
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Arabian Journal of Geosciences, 2021
Raft and pile foundations are combined with the twofold aim of increasing the overall bearing cap... more Raft and pile foundations are combined with the twofold aim of increasing the overall bearing capacity and reduce the average/differential settlements. This results in a complex system and gives rise to significant soil–structure interaction mechanisms. In the last years, both bearing capacity and settlements of piled raft have been usually expected on the basis of empirical formulas, analytical relationships, and numerical analyses. The conventional design methods currently used in practice are based upon relatively conservative assumptions of raft–soil–pile interaction; as a result, they are in many cases inaccurate and unlikely to result in optimum design. Thus, resorting to numerical analyses seems to be the most reliable method, mainly because of the multiple interactions and the three-dimensional geometry that must be considered in most cases. In this context, 3D finite difference analyses were performed to investigate the behavior of piled raft foundation system in drained conditions of soft clays. The overall objective of the present paper focuses on the load response and effects of multiple interactions of piled raft subjected to vertical loading. For this purpose, several types of foundations were considered including piled raft, group of piles and unpiled raft. For optimization purposes, the behavior of the piled raft was also investigated by varying some parameters as pile number and piling configuration. The concluded observations from the parametric study provide further insight into the mechanical response of piled raft and aim at helping the engineers in taking a logical path in an iterative design process for a piled raft foundation.
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World Journal of Engineering, 2020
Purpose This paper aims to focus on three-dimensional (3D) numerical simulation of a monitored ur... more Purpose This paper aims to focus on three-dimensional (3D) numerical simulation of a monitored urban underground road consisting of diaphragm walls supported by one row of temporary steel struts and a cover slab in the central area. In addition to the lateral wall displacements, the analysis focuses on the load development in the struts and the evolution of the total stresses at the soil–wall interface, and highlights the 3D effect on the behavior of the structure. Design/methodology/approach Computation by back-analysis has become an important contribution to the understanding of observed phenomena. In this context, this paper investigates a full 3D numerical back-analysis of diaphragm wall deformation using the finite difference code FLAC3D. Findings The instrumentation allows a deep understanding of the ground response and the soil-structure interaction phenomena. It also provides an opportunity to validate numerical models. Using a soil model with simple failure criteria, the wa...
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Tunnelling and Underground Space Technology, 2019
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Geotechnical and Geological Engineering, 2016
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European Journal of Environmental and Civil engineering, 2010
... d'une excavation profonde multisupportée instrumentée Mohamed Nabil Houhou* ― Fabrice Em... more ... d'une excavation profonde multisupportée instrumentée Mohamed Nabil Houhou* ― Fabrice Emeriault** Richard Kastner** ― Sadoc Benmebarek* ... Il s'agit du chantier de la station Jeanne-d'Arc, située sur la ligne B du métro de l'agglomération toulousaine. ...
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Journal of The Institution of Engineers (India): Series C, 2020
Bookmarks Related papers MentionsView impact
Composites Part B: Engineering, 2013
Bookmarks Related papers MentionsView impact
CRC Press eBooks, May 19, 2014
International audienc
Bookmarks Related papers MentionsView impact
World Journal of Engineering
Purpose This paper aims to investigate the responses of single piles and pile groups due to tunne... more Purpose This paper aims to investigate the responses of single piles and pile groups due to tunneling-induced ground movements in a two-layered soil system. The analyses mainly focus on the additional single pile responses in terms of bending moment, lateral deflection, axial force, shaft resistance and pile settlement. Subsequently, a series of parametric studies were carried out to better understand the responses of single piles induced by tunneling. To give further understanding regarding the pile groups, a 2 × 2 pile group with two different pile head conditions, namely, free and capped, was considered. Design/methodology/approach Using the PLAXIS three-dimensional (3D) software, a full 3D numerical modeling is performed to investigate the effects of ground movements caused by tunneling on adjacent pile foundations. The numerical model was validated using centrifuge test data found in the literature. The relevance of the 3D model is also judged by comparison with the 2D plane st...
Bookmarks Related papers MentionsView impact
Archive of Applied Mechanics
Bookmarks Related papers MentionsView impact
World Journal of Engineering, 2021
Purpose This paper aims to investigate single pile and pile group responses due to deep braced ex... more Purpose This paper aims to investigate single pile and pile group responses due to deep braced excavation-induced soil movement in soft clay overlying dense sand. The analysis focuses first on the response of vertical single pile in terms of induced bending moment, lateral deflection, induced axial force, skin resistance distribution and pile settlement. To better understand the single pile behaviour, a parametric study was carried out. To provide further insights about the response of pile group system, different pile group configurations were considered. Design/methodology/approach Using the explicit finite element code PLAXIS 3 D, a full three-dimensional numerical analysis is carried out to investigate pile responses when performing an adjacent deep braced excavation. The numerical model was validated based on the results of a centrifuge test. The relevance of the 3 D model is also judged by comparison with the 2 D plane strain model using the PLAXIS 2 D code. Findings The resul...
Bookmarks Related papers MentionsView impact
Infrastructures, 2022
This study describes the results of a series of 2D finite element method (FEM) numerical models o... more This study describes the results of a series of 2D finite element method (FEM) numerical models of 6 m high back-to-back reinforced soil walls using the geotechnical software PLAXIS. These structures are used to support embankments, especially for bridge abutment approaches. The quantitative influence of problem geometry, strip pre-tensioning, strip type, and surcharging on horizontal displacements, development of soil shear and plastic zones, lateral earth pressure, and reinforcement loads is presented. The numerical results demonstrate how this type of reinforced soil walls perform jointly at a certain distance of interaction between the two opposite walls. The walls of the two opposing sides clearly interact with each other when they are close enough and with an overlapping reinforcement layout. Pre-tensioning load can contribute to achieving vertical wall-facing alignment at the end of construction. Using perforated/holed strips, the tensile loads at the end of construction were...
Bookmarks Related papers MentionsView impact
Journal of Solid Mechanics, 2020
In this research paper, the formulation of a new three-dimensional sector element based on the st... more In this research paper, the formulation of a new three-dimensional sector element based on the strain approach is presented for plate bending problems and linear static analysis of circular structures. The proposed element has the three essential external degrees of freedom (Ur, Vθ and W) at each of the eight corner nodes. The displacements field of the present element is based on assumed functions for the different strains satisfying the compatibility equations. The effectiveness of the present element is applied through several tests related to plate bending problems and linear static analysis of circular structures. The results of the developed element have been compared with analytical and other numerical solutions available in the literature. The obtained results show the excellent performances and precision of the present element. It is found that the new three-dimensional sector element is more accurate and efficient than the three-dimensional classical element based on displ...
Bookmarks Related papers MentionsView impact
Recent Advances in Geo-Environmental Engineering, Geomechanics and Geotechnics, and Geohazards, 2018
The piled raft (PR) system was developed to use the load-carrying capabilities of both shallow fo... more The piled raft (PR) system was developed to use the load-carrying capabilities of both shallow foundations (rafts) and deep foundations (piles). These components interact with each other through a complex soil-structure interaction scheme. The interaction effects affect the overall load response of PR. In this study, the explicit finite difference code FLAC3D (Fast lagrangian Analyses od Continua) was used to investigate the behavior of PR subjected to vertical loading. Several foundations embedded in soft clay were considered. The results prove that even in the case of soft clay, the load-carrying capacity of the raft and piles, when combined in a PR, becomes different from those of unpiled raft (UR) and group of piles (GP), due to the interactions between raft and piles.
Bookmarks Related papers MentionsView impact
World Journal of Engineering, 2020
Purpose This paper aims to investigate the pile group efficiency based on the load-settlement res... more Purpose This paper aims to investigate the pile group efficiency based on the load-settlement response in soft clay conditions, considering several pile configurations using a variable number of piles and pile spacing. The overall objective of the present paper is to provide further insight into the mechanical response of the pile group and aim at helping the engineers in taking a logical path in an iterative design process for pile group efficiency. Design/methodology/approach To investigate the pile group efficiency, three-dimensional (3D) numerical simulations were performed using the finite-difference code FLAC3D. Findings The obtained numerical results are validated by comparing them to those of similar subgrade structure and in comparable geological conditions provided within the literature. The results indicated that although the bearing capacity of the pile group increases with increasing number of piles, the efficiency of the pile group is very important for a small number ...
Bookmarks Related papers MentionsView impact
Arabian Journal of Geosciences, 2021
Raft and pile foundations are combined with the twofold aim of increasing the overall bearing cap... more Raft and pile foundations are combined with the twofold aim of increasing the overall bearing capacity and reduce the average/differential settlements. This results in a complex system and gives rise to significant soil–structure interaction mechanisms. In the last years, both bearing capacity and settlements of piled raft have been usually expected on the basis of empirical formulas, analytical relationships, and numerical analyses. The conventional design methods currently used in practice are based upon relatively conservative assumptions of raft–soil–pile interaction; as a result, they are in many cases inaccurate and unlikely to result in optimum design. Thus, resorting to numerical analyses seems to be the most reliable method, mainly because of the multiple interactions and the three-dimensional geometry that must be considered in most cases. In this context, 3D finite difference analyses were performed to investigate the behavior of piled raft foundation system in drained conditions of soft clays. The overall objective of the present paper focuses on the load response and effects of multiple interactions of piled raft subjected to vertical loading. For this purpose, several types of foundations were considered including piled raft, group of piles and unpiled raft. For optimization purposes, the behavior of the piled raft was also investigated by varying some parameters as pile number and piling configuration. The concluded observations from the parametric study provide further insight into the mechanical response of piled raft and aim at helping the engineers in taking a logical path in an iterative design process for a piled raft foundation.
Bookmarks Related papers MentionsView impact
World Journal of Engineering, 2020
Purpose This paper aims to focus on three-dimensional (3D) numerical simulation of a monitored ur... more Purpose This paper aims to focus on three-dimensional (3D) numerical simulation of a monitored urban underground road consisting of diaphragm walls supported by one row of temporary steel struts and a cover slab in the central area. In addition to the lateral wall displacements, the analysis focuses on the load development in the struts and the evolution of the total stresses at the soil–wall interface, and highlights the 3D effect on the behavior of the structure. Design/methodology/approach Computation by back-analysis has become an important contribution to the understanding of observed phenomena. In this context, this paper investigates a full 3D numerical back-analysis of diaphragm wall deformation using the finite difference code FLAC3D. Findings The instrumentation allows a deep understanding of the ground response and the soil-structure interaction phenomena. It also provides an opportunity to validate numerical models. Using a soil model with simple failure criteria, the wa...
Bookmarks Related papers MentionsView impact
Tunnelling and Underground Space Technology, 2019
Bookmarks Related papers MentionsView impact
Geotechnical and Geological Engineering, 2016
Bookmarks Related papers MentionsView impact
European Journal of Environmental and Civil engineering, 2010
... d'une excavation profonde multisupportée instrumentée Mohamed Nabil Houhou* ― Fabrice Em... more ... d'une excavation profonde multisupportée instrumentée Mohamed Nabil Houhou* ― Fabrice Emeriault** Richard Kastner** ― Sadoc Benmebarek* ... Il s'agit du chantier de la station Jeanne-d'Arc, située sur la ligne B du métro de l'agglomération toulousaine. ...
Bookmarks Related papers MentionsView impact
Journal of The Institution of Engineers (India): Series C, 2020
Bookmarks Related papers MentionsView impact