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Marwan Al Heib - One of the best experts on this subject based on the ideXlab platform.

  • Collapses of underground cavities and Soil-Structure Interactions : experimental and numerical models
    2016
    Co-Authors: Matthieu Caudron, Richard Kastner, Fabrice Emeriault, Marwan Al Heib
    Abstract:

    The great subsidences result from the collapses of underground cavities man-made (mines or careers) or formed naturally by water flow in soluble solid masses of rocks (limestone, gypsum). Their impact on the existing Structures standing on the surface is generally very important as show the recent examples of Auboué (1996), Moutiers (1997) and Roncourt (1999) which damaged more than five hundred buildings and the sinkhole on building site of METEOR subway in 2003. It is thus necessary to forecast the movements of the Soil surface (subsidence and horizontal deformation) resulting from these phenomena and especially to determine the impact that may have the presence of Structures on the form and the amplitude of these movements. The current practice to forecast the effects on the Structures consists in determining the movements caused by the subsidence of the cavity without the building (in greenfield) then to use these results to check the capacity of the Structure to resist the phenomenon. This approach can largely underestimate or over-estimate the generated loading, which in both cases has negative impacts (risk remaining for the Structure or overcost of project in the other hand). In the present communication, Soil-Structure interaction during a sinkhole phenomenon is studied by a dual approach using a physical model and a numerical method. First of all, the physical model will use the bidimensionnal Schneebeli material in a small-scale model allowing fully controlled tests. The Schneebeli material is modified in order to allow the presence of cohesion. The Soil mass of great dimensions (2m width for 1m height) makes it possible to represent the happening of a sinkhole with a scale factor of 1/40. The use of a building model will allow us to shed some light on the Soil-Structure interaction during the sinkhole. Thereafter we will set a numerical model using a coupled approach betwen finite difference and discrete element (FLAC2D – PFC2D coupled computations). This will allow us to study more easier different case of parameters : the size of the cavity, the thickness of the roof over the cavity, the position of the Structure compared to the cavity, etc ...

  • Collapses of underground cavities and Soil-Structure Interactions: influences of the position of the Structure relative to the cavity
    2008
    Co-Authors: Matthieu Caudron, Marwan Al Heib, Fabrice Emeriault
    Abstract:

    This paper is focused on Soil subsidence of small extend and amplitude caused by tunnel boring or the collapse of underground cavities, whether natural or man-made. The impact of the movements of the ground on existing Structures is generally dramatic. It is therefore necessary to accurately predict these movements (settlements and horizontal extension or compression displacements). Even though it is obvious that the overall stiffness and weight of the Structure influences the size and shape of the Soil movement, the main features of this Soil-Structure interaction phenomenon are not well established. Caudron et al. (2006) developed an original small-scale physical model to take the Soil-Structure interaction into account. It is based on the use of the frictional Schneebeli material (assembly of small diameter rods) and a modified version including cohesion in order to reproduce a cohesive layer above a cavity. The displacements of the Soil are obtained from digital images processing by particle image velocimetry (PIV). Interesting results were obtained, probing that the Soil-Structure Interactions could be analysed by this experimental model. This article is focused in a first part on the influence of the position of the Structure with respect to the cavity position. Consequences on the areas mainly concerned by horizontal compression or extension of the Structure are determined. It appears that the stresses induced in the building are a superposition of several elementary loading (sum of the effects of the slope, the horizontal deformations and the curvature). The second part concerns the effect of the relative Soil/Structure stiffness on the ground movement during a cavity collapse by considering a second model of Structure with similar dimensions but more flexible.

  • Sinkhole and Soil-Structure Interactions: Development of an experimental model
    2006
    Co-Authors: Matthieu Caudron, Richard Kastner, Fabrice Emeriault, Marwan Al Heib
    Abstract:

    Soil-Structure Interactions during a sinkhole phenomenon are analyzed with a physical small-scale model developed using an analogical two-dimensional Soil and a building model. A test bed allowing fully controlled test is used. The paper presents the results of a series of tests during which vertical and horizontal displacements of the Schneebeli steel rods are determined with the Digital Image Correlation technique at different steps of the creation of an underground cavity. First, repeatability tests are performed as well as a greenfield test. Then the same initial conditions are considered for a test with a model of building located at ground level and above the cavity.

  • collapses of underground cavities and Soil Structure Interactions experimental and numerical models
    2006
    Co-Authors: Matthieu Caudron, Richard Kastner, Fabrice Emeriault, Marwan Al Heib
    Abstract:

    The great subsidences result from the collapses of underground cavities man-made (mines or careers) or formed naturally by water flow in soluble solid masses of rocks (limestone, gypsum). Their impact on the existing Structures standing on the surface is generally very important as show the recent examples of Auboue (1996), Moutiers (1997) and Roncourt (1999) which damaged more than five hundred buildings and the sinkhole on building site of METEOR subway in 2003. It is thus necessary to forecast the movements of the Soil surface (subsidence and horizontal deformation) resulting from these phenomena and especially to determine the impact that may have the presence of Structures on the form and the amplitude of these movements. The current practice to forecast the effects on the Structures consists in determining the movements caused by the subsidence of the cavity without the building (in greenfield) then to use these results to check the capacity of the Structure to resist the phenomenon. This approach can largely underestimate or over-estimate the generated loading, which in both cases has negative impacts (risk remaining for the Structure or overcost of project in the other hand). In the present communication, Soil-Structure interaction during a sinkhole phenomenon is studied by a dual approach using a physical model and a numerical method. First of all, the physical model will use the bidimensionnal Schneebeli material in a small-scale model allowing fully controlled tests. The Schneebeli material is modified in order to allow the presence of cohesion. The Soil mass of great dimensions (2m width for 1m height) makes it possible to represent the happening of a sinkhole with a scale factor of 1/40. The use of a building model will allow us to shed some light on the Soil-Structure interaction during the sinkhole. Thereafter we will set a numerical model using a coupled approach betwen finite difference and discrete element (FLAC2D – PFC2D coupled computations). This will allow us to study more easier different case of parameters : the size of the cavity, the thickness of the roof over the cavity, the position of the Structure compared to the cavity, etc ...

Fabrice Emeriault - One of the best experts on this subject based on the ideXlab platform.

  • Collapses of underground cavities and Soil-Structure Interactions : experimental and numerical models
    2016
    Co-Authors: Matthieu Caudron, Richard Kastner, Fabrice Emeriault, Marwan Al Heib
    Abstract:

    The great subsidences result from the collapses of underground cavities man-made (mines or careers) or formed naturally by water flow in soluble solid masses of rocks (limestone, gypsum). Their impact on the existing Structures standing on the surface is generally very important as show the recent examples of Auboué (1996), Moutiers (1997) and Roncourt (1999) which damaged more than five hundred buildings and the sinkhole on building site of METEOR subway in 2003. It is thus necessary to forecast the movements of the Soil surface (subsidence and horizontal deformation) resulting from these phenomena and especially to determine the impact that may have the presence of Structures on the form and the amplitude of these movements. The current practice to forecast the effects on the Structures consists in determining the movements caused by the subsidence of the cavity without the building (in greenfield) then to use these results to check the capacity of the Structure to resist the phenomenon. This approach can largely underestimate or over-estimate the generated loading, which in both cases has negative impacts (risk remaining for the Structure or overcost of project in the other hand). In the present communication, Soil-Structure interaction during a sinkhole phenomenon is studied by a dual approach using a physical model and a numerical method. First of all, the physical model will use the bidimensionnal Schneebeli material in a small-scale model allowing fully controlled tests. The Schneebeli material is modified in order to allow the presence of cohesion. The Soil mass of great dimensions (2m width for 1m height) makes it possible to represent the happening of a sinkhole with a scale factor of 1/40. The use of a building model will allow us to shed some light on the Soil-Structure interaction during the sinkhole. Thereafter we will set a numerical model using a coupled approach betwen finite difference and discrete element (FLAC2D – PFC2D coupled computations). This will allow us to study more easier different case of parameters : the size of the cavity, the thickness of the roof over the cavity, the position of the Structure compared to the cavity, etc ...

  • Physical modelling of Soil-Structure interaction in the subsidence area
    2014
    Co-Authors: Luyen Nghiem, Fabrice Emeriault, Marwan Al Heib
    Abstract:

    Failures of underground Structures can affect the existing building on the ground surface. Investigation of Soil-Structure Interactions is one of the most effective means of predicting the effect of failures on future Structures and assessing damage on Structures already existing in a subsidence area. The paper presents experimental results of the phenomena using a large scale physical model representing a masonry Structure subject to subsidence settlement, using 1/40 scale factor on geometry and under the normal gravity. Homogenous sand is used for the analogue Soil and the analogue masonry Structure is built from small wooden pieces. Comparison of different positions of the Structure on the surface is considered. Transfer ratios of displacements, slope, and deflexion are adopted to study the Structure behaviour compared to the ground. Besides, the damage is evaluated with different criteria and completed by the consideration of the crack positions on the Structure provided by Digital Image Correlation (DIC) technique.

  • Collapses of underground cavities and Soil-Structure Interactions: influences of the position of the Structure relative to the cavity
    2008
    Co-Authors: Matthieu Caudron, Marwan Al Heib, Fabrice Emeriault
    Abstract:

    This paper is focused on Soil subsidence of small extend and amplitude caused by tunnel boring or the collapse of underground cavities, whether natural or man-made. The impact of the movements of the ground on existing Structures is generally dramatic. It is therefore necessary to accurately predict these movements (settlements and horizontal extension or compression displacements). Even though it is obvious that the overall stiffness and weight of the Structure influences the size and shape of the Soil movement, the main features of this Soil-Structure interaction phenomenon are not well established. Caudron et al. (2006) developed an original small-scale physical model to take the Soil-Structure interaction into account. It is based on the use of the frictional Schneebeli material (assembly of small diameter rods) and a modified version including cohesion in order to reproduce a cohesive layer above a cavity. The displacements of the Soil are obtained from digital images processing by particle image velocimetry (PIV). Interesting results were obtained, probing that the Soil-Structure Interactions could be analysed by this experimental model. This article is focused in a first part on the influence of the position of the Structure with respect to the cavity position. Consequences on the areas mainly concerned by horizontal compression or extension of the Structure are determined. It appears that the stresses induced in the building are a superposition of several elementary loading (sum of the effects of the slope, the horizontal deformations and the curvature). The second part concerns the effect of the relative Soil/Structure stiffness on the ground movement during a cavity collapse by considering a second model of Structure with similar dimensions but more flexible.

  • Sinkhole and Soil-Structure Interactions: Development of an experimental model
    2006
    Co-Authors: Matthieu Caudron, Richard Kastner, Fabrice Emeriault, Marwan Al Heib
    Abstract:

    Soil-Structure Interactions during a sinkhole phenomenon are analyzed with a physical small-scale model developed using an analogical two-dimensional Soil and a building model. A test bed allowing fully controlled test is used. The paper presents the results of a series of tests during which vertical and horizontal displacements of the Schneebeli steel rods are determined with the Digital Image Correlation technique at different steps of the creation of an underground cavity. First, repeatability tests are performed as well as a greenfield test. Then the same initial conditions are considered for a test with a model of building located at ground level and above the cavity.

  • collapses of underground cavities and Soil Structure Interactions experimental and numerical models
    2006
    Co-Authors: Matthieu Caudron, Richard Kastner, Fabrice Emeriault, Marwan Al Heib
    Abstract:

    The great subsidences result from the collapses of underground cavities man-made (mines or careers) or formed naturally by water flow in soluble solid masses of rocks (limestone, gypsum). Their impact on the existing Structures standing on the surface is generally very important as show the recent examples of Auboue (1996), Moutiers (1997) and Roncourt (1999) which damaged more than five hundred buildings and the sinkhole on building site of METEOR subway in 2003. It is thus necessary to forecast the movements of the Soil surface (subsidence and horizontal deformation) resulting from these phenomena and especially to determine the impact that may have the presence of Structures on the form and the amplitude of these movements. The current practice to forecast the effects on the Structures consists in determining the movements caused by the subsidence of the cavity without the building (in greenfield) then to use these results to check the capacity of the Structure to resist the phenomenon. This approach can largely underestimate or over-estimate the generated loading, which in both cases has negative impacts (risk remaining for the Structure or overcost of project in the other hand). In the present communication, Soil-Structure interaction during a sinkhole phenomenon is studied by a dual approach using a physical model and a numerical method. First of all, the physical model will use the bidimensionnal Schneebeli material in a small-scale model allowing fully controlled tests. The Schneebeli material is modified in order to allow the presence of cohesion. The Soil mass of great dimensions (2m width for 1m height) makes it possible to represent the happening of a sinkhole with a scale factor of 1/40. The use of a building model will allow us to shed some light on the Soil-Structure interaction during the sinkhole. Thereafter we will set a numerical model using a coupled approach betwen finite difference and discrete element (FLAC2D – PFC2D coupled computations). This will allow us to study more easier different case of parameters : the size of the cavity, the thickness of the roof over the cavity, the position of the Structure compared to the cavity, etc ...

Matthieu Caudron - One of the best experts on this subject based on the ideXlab platform.

  • Collapses of underground cavities and Soil-Structure Interactions : experimental and numerical models
    2016
    Co-Authors: Matthieu Caudron, Richard Kastner, Fabrice Emeriault, Marwan Al Heib
    Abstract:

    The great subsidences result from the collapses of underground cavities man-made (mines or careers) or formed naturally by water flow in soluble solid masses of rocks (limestone, gypsum). Their impact on the existing Structures standing on the surface is generally very important as show the recent examples of Auboué (1996), Moutiers (1997) and Roncourt (1999) which damaged more than five hundred buildings and the sinkhole on building site of METEOR subway in 2003. It is thus necessary to forecast the movements of the Soil surface (subsidence and horizontal deformation) resulting from these phenomena and especially to determine the impact that may have the presence of Structures on the form and the amplitude of these movements. The current practice to forecast the effects on the Structures consists in determining the movements caused by the subsidence of the cavity without the building (in greenfield) then to use these results to check the capacity of the Structure to resist the phenomenon. This approach can largely underestimate or over-estimate the generated loading, which in both cases has negative impacts (risk remaining for the Structure or overcost of project in the other hand). In the present communication, Soil-Structure interaction during a sinkhole phenomenon is studied by a dual approach using a physical model and a numerical method. First of all, the physical model will use the bidimensionnal Schneebeli material in a small-scale model allowing fully controlled tests. The Schneebeli material is modified in order to allow the presence of cohesion. The Soil mass of great dimensions (2m width for 1m height) makes it possible to represent the happening of a sinkhole with a scale factor of 1/40. The use of a building model will allow us to shed some light on the Soil-Structure interaction during the sinkhole. Thereafter we will set a numerical model using a coupled approach betwen finite difference and discrete element (FLAC2D – PFC2D coupled computations). This will allow us to study more easier different case of parameters : the size of the cavity, the thickness of the roof over the cavity, the position of the Structure compared to the cavity, etc ...

  • Collapses of underground cavities and Soil-Structure Interactions: influences of the position of the Structure relative to the cavity
    2008
    Co-Authors: Matthieu Caudron, Marwan Al Heib, Fabrice Emeriault
    Abstract:

    This paper is focused on Soil subsidence of small extend and amplitude caused by tunnel boring or the collapse of underground cavities, whether natural or man-made. The impact of the movements of the ground on existing Structures is generally dramatic. It is therefore necessary to accurately predict these movements (settlements and horizontal extension or compression displacements). Even though it is obvious that the overall stiffness and weight of the Structure influences the size and shape of the Soil movement, the main features of this Soil-Structure interaction phenomenon are not well established. Caudron et al. (2006) developed an original small-scale physical model to take the Soil-Structure interaction into account. It is based on the use of the frictional Schneebeli material (assembly of small diameter rods) and a modified version including cohesion in order to reproduce a cohesive layer above a cavity. The displacements of the Soil are obtained from digital images processing by particle image velocimetry (PIV). Interesting results were obtained, probing that the Soil-Structure Interactions could be analysed by this experimental model. This article is focused in a first part on the influence of the position of the Structure with respect to the cavity position. Consequences on the areas mainly concerned by horizontal compression or extension of the Structure are determined. It appears that the stresses induced in the building are a superposition of several elementary loading (sum of the effects of the slope, the horizontal deformations and the curvature). The second part concerns the effect of the relative Soil/Structure stiffness on the ground movement during a cavity collapse by considering a second model of Structure with similar dimensions but more flexible.

  • Sinkhole and Soil-Structure Interactions: Development of an experimental model
    2006
    Co-Authors: Matthieu Caudron, Richard Kastner, Fabrice Emeriault, Marwan Al Heib
    Abstract:

    Soil-Structure Interactions during a sinkhole phenomenon are analyzed with a physical small-scale model developed using an analogical two-dimensional Soil and a building model. A test bed allowing fully controlled test is used. The paper presents the results of a series of tests during which vertical and horizontal displacements of the Schneebeli steel rods are determined with the Digital Image Correlation technique at different steps of the creation of an underground cavity. First, repeatability tests are performed as well as a greenfield test. Then the same initial conditions are considered for a test with a model of building located at ground level and above the cavity.

  • collapses of underground cavities and Soil Structure Interactions experimental and numerical models
    2006
    Co-Authors: Matthieu Caudron, Richard Kastner, Fabrice Emeriault, Marwan Al Heib
    Abstract:

    The great subsidences result from the collapses of underground cavities man-made (mines or careers) or formed naturally by water flow in soluble solid masses of rocks (limestone, gypsum). Their impact on the existing Structures standing on the surface is generally very important as show the recent examples of Auboue (1996), Moutiers (1997) and Roncourt (1999) which damaged more than five hundred buildings and the sinkhole on building site of METEOR subway in 2003. It is thus necessary to forecast the movements of the Soil surface (subsidence and horizontal deformation) resulting from these phenomena and especially to determine the impact that may have the presence of Structures on the form and the amplitude of these movements. The current practice to forecast the effects on the Structures consists in determining the movements caused by the subsidence of the cavity without the building (in greenfield) then to use these results to check the capacity of the Structure to resist the phenomenon. This approach can largely underestimate or over-estimate the generated loading, which in both cases has negative impacts (risk remaining for the Structure or overcost of project in the other hand). In the present communication, Soil-Structure interaction during a sinkhole phenomenon is studied by a dual approach using a physical model and a numerical method. First of all, the physical model will use the bidimensionnal Schneebeli material in a small-scale model allowing fully controlled tests. The Schneebeli material is modified in order to allow the presence of cohesion. The Soil mass of great dimensions (2m width for 1m height) makes it possible to represent the happening of a sinkhole with a scale factor of 1/40. The use of a building model will allow us to shed some light on the Soil-Structure interaction during the sinkhole. Thereafter we will set a numerical model using a coupled approach betwen finite difference and discrete element (FLAC2D – PFC2D coupled computations). This will allow us to study more easier different case of parameters : the size of the cavity, the thickness of the roof over the cavity, the position of the Structure compared to the cavity, etc ...

Nikolaos Nikitas - One of the best experts on this subject based on the ideXlab platform.

  • Soil Structure Interactions ssi for offshore wind turbines
    2017
    Co-Authors: Subhamoy Bhattacharya, Georgios Nikitas, Laszlo Arany, Nikolaos Nikitas
    Abstract:

    Soil-Structure-Interaction (SSI) for offshore wind turbine supporting Structures is essentially the interaction of the foundation/foundations with the supporting Soil due to the complex set of loading. This paper reviews the different aspects of SSI for different types of foundations used or proposed to support offshore wind turbines. Due to cyclic and dynamic nature of the loading that acts on the wind turbine Structure, the dominant SSI will depend to a large extent on the global modes of vibration of the overall Structure. This paper summarises the modes of vibration of offshore wind turbines Structures supported on different types of foundations based on observations from scaled model tests and numerical analysis. As these are new Structures with limited monitoring data, field records are scarce. Field records available in the public domain are also used to compare with the experimental findings.

  • Soil Structure Interactions for offshore wind turbines
    Engineering & Technology Reference, 2012
    Co-Authors: Subhamoy Bhattacharya, Georgios Nikitas, Laszlo Arany, Nikolaos Nikitas
    Abstract:

    Soil–Structure interaction (SSI) for offshore wind turbine supporting Structures is essentially the interaction of the foundation/foundations with the supporting Soil due to the complex set of loading. This study reviews the different aspects of SSI for different types of foundations used or proposed to support offshore wind turbines. Due to cyclic and dynamic nature of the loading that acts on the wind turbine Structure, the dominant SSI will depend to a large extent on the global modes of vibration of the overall Structure. This study summarises the modes of vibration of offshore wind turbines Structures supported on different types of foundations based on observations from scaled model tests and numerical analysis. As these are new Structures with limited monitoring data, field records are scarce. Where possible, field records available in the public domain are also used to compare with experimental findings.

Yongsheng Chen - One of the best experts on this subject based on the ideXlab platform.

  • A shaking table subStructure testing method for the structural seismic evaluation considering Soil-Structure Interactions:
    Advances in Structural Engineering, 2020
    Co-Authors: Yong Ding, Yongsheng Chen
    Abstract:

    A novel shaking table subStructure testing method that includes interaction forces determined by actuator forces and shaking table dynamic parameters is proposed and validated. The seismic performance of a storage tank that incorporates Soil-Structure Interactions is investigated by the method proposed in this article. The experimental results show that the proposed shaking table subStructure testing method is an efficient alternative method of evaluating the seismic performance of a storage tank that incorporates Soil-Structure Interactions. The experimental results show that the influence of the Soil-Structure Interactions increases as the stiffness of the foundation Soil decreases, which was demonstrated by the results showing that the displacement and acceleration responses of the storage tank decrease as the stiffness of the foundation Soil decreases. Moreover, the influence of the Soil-Structure Interactions increases as the liquid height increases, which was illustrated by the decreased displacement responses of the storage tank with increases in the liquid height. The maximum acceleration response of the storage tank occurred at the liquid surface height.

  • a shaking table subStructure testing method for the structural seismic evaluation considering Soil Structure Interactions
    Advances in Structural Engineering, 2020
    Co-Authors: Yong Ding, Yongsheng Chen
    Abstract:

    A novel shaking table subStructure testing method that includes interaction forces determined by actuator forces and shaking table dynamic parameters is proposed and validated. The seismic performa...