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L. Combrinck - One of the best experts on this subject based on the ideXlab platform.

  • Geotechnical Investigation FOR THE CONSTRUCTION OF A VAULT IN A ROCKFACE FOR THE PLACEMENT OF A GRAVIMETER AND A LONG PERIOD SEISMOGRAPH AT MATJIESFONTEIN, SOUTH AFRICA
    South African Journal of Geology, 2011
    Co-Authors: L. Croukamp, J. J. Rossouw, Coenrad J. Fourie, L. Combrinck
    Abstract:

    The aim of the project is to investigate the rock mass parameters at a site in the vicinity of Matjiesfontein (Western Cape Province) so as to ascertain the suitability for the construction of a vault in a rock face. This vault will host a permanent LaCoste and Romberg ultra-sensitive gravimeter as well as a long period seismograph. The site is close to the contact between the Dwyka Formation of the Karoo Supergroup and the Witteberg Group, both part of the Cape Supergroup. A site survey, joint analysis, core logging and laboratory testing on rock specimens formed part of the Geotechnical Investigation. Laboratory tests included unconfined compression strength and point load tests. The data obtained from the fieldwork and laboratory analysis were used to determine the rock quality designation value of the rock, which was subsequently combined with the other parameters to obtain a rock mass rating. All data were utilised to develop a model for best practice construction (e.g. excavated vault in solid rock versus a concrete structure against rock face), as well as to develop a preliminary design for the vault. The results of the Geotechnical Investigation indicate that the site is suitable for the proposed project.

  • Geotechnical Investigation for the construction of a vault in a rockface for the placement of a gravimeter and a long period seismograph at matjiesfontein, South Africa
    South African Journal of Geology, 2011
    Co-Authors: L. Croukamp, J. J. Rossouw, Coenrad J. Fourie, L. Combrinck
    Abstract:

    The aim of the project is to investigate the rock mass parameters at a site in the vicinity of Matjiesfontein (Western Cape Province) so as to ascertain the suitability for the construction of a vault in a rock face. This vault will host a permanent LaCoste and Romberg ultrasensitive gravimeter as well as a long period seismograph. The site is close to the contact between the Dwyka Formation of the Karoo Supergroup and the Witteberg Group, both part of the Cape Supergroup. A site survey, joint analysis, core logging and laboratory testing on rock specimens formed part of the Geotechnical Investigation. Laboratory tests included unconfined compression strength and point load tests. The data obtained from the fieldwork and laboratory analysis were used to determine the rock quality designation value of the rock, which was subsequently combined with the other parameters to obtain a rock mass rating. All data were utilised to develop a model for best practice construction (e.g. excavated vault in solid rock versus a concrete structure against rock face), as well as to develop a preliminary design for the vault. The results of the Geotechnical Investigation indicate that the site is suitable for the proposed project. © 2011 December Geological Society of South Africa.

Lena Persson - One of the best experts on this subject based on the ideXlab platform.

  • geophysical assessment and Geotechnical Investigation of quick clay landslides a swedish case study
    Near Surface Geophysics, 2013
    Co-Authors: Alireza Malehmir, Mehrdad Bastani, Charlotte M Krawczyk, Ulrich Polom, Marcus Gurk, Nazli Ismail, Lena Persson
    Abstract:

    We present a preliminary assessment of the potential utility of various geophysical measurements carried out over a quick-clay landslide site in south-west Sweden. The multidisciplinary approach includes active P- and S-wave seismic Investigations, including 2D and 3D reflection and refraction surveys, passive single and 3C seismic surveys, electrical resistivity tomography and electromagnetic surveys including controlled-source and radio-magnetotellurics, ground-penetrating radar and potential field studies. The P-wave and particularly S-wave reflection seismic data show a highresolution image of bedrock topography and the stratigraphy of a 100 m thick sequence of sediments that lies on top, which include lightly consolidated quick-clays. Of particular interest is the identification of a layer of relatively coarse-grained material between 10–20 m below the ground surface. Geotechnical Investigations indicate that most but not all quick-clays at the site are located above this layer. Further studies are required to determine the importance of their relationship and whether the coarse-grained layer may have had a role in triggering quick-clay landslides in the region. Geoelectrical and electromagnetic methods provide high-resolution images of the unconsolidated subsurface and particularly the normal and leached clays. Radio-magnetotelluric methods proved valuable near the river where traditional geoelectrical methods failed to provide sufficient depth coverage. The study shows that geophysical data are able to image major subsurface structures associated with quick-clay landslides.

  • a multidisciplinary geophysical and Geotechnical Investigation of quick clay landslides in sweden
    Seg Technical Program Expanded Abstracts, 2013
    Co-Authors: Alireza Malehmir, Silvia Salas Romero, Chunling Shan, Emil Lundberg, Christopher Juhlin, Mehrdad Bastani, Lena Persson, Charlotte M Krawczyk, Ulrich Polom, A Adamczyk
    Abstract:

    Summary Landslides are one of the most commonly occurring natural disasters. They claim hundreds of human lives and cost billions of dollars every year. In order to provide geophysical tools and techniques to better characterize sites prone to slide, we have been carrying out and evaluating potential utility of several geophysical surveys over a quick clay landslide site in southwest Sweden since 2011. The measurements include 2D and 3D P- and S-wave high resolution surface seismics, radio- and controlled-source electromagnetics, geoelectrics, ground gravity and magnetic surveys. A particular focus here is given to the seismic studies in the site. Combined with downhole geophysical and Geotechnical measurements, we show that majority of reflections correlate well with sandy-silty formations in the site. Quick clays often occur above these formations, which may be an indication of the role of coarse-grained formations to not only partly form quick clays but also triggering them when pore-water pressure is significantly increased.

L. Croukamp - One of the best experts on this subject based on the ideXlab platform.

  • Geotechnical Investigation FOR THE CONSTRUCTION OF A VAULT IN A ROCKFACE FOR THE PLACEMENT OF A GRAVIMETER AND A LONG PERIOD SEISMOGRAPH AT MATJIESFONTEIN, SOUTH AFRICA
    South African Journal of Geology, 2011
    Co-Authors: L. Croukamp, J. J. Rossouw, Coenrad J. Fourie, L. Combrinck
    Abstract:

    The aim of the project is to investigate the rock mass parameters at a site in the vicinity of Matjiesfontein (Western Cape Province) so as to ascertain the suitability for the construction of a vault in a rock face. This vault will host a permanent LaCoste and Romberg ultra-sensitive gravimeter as well as a long period seismograph. The site is close to the contact between the Dwyka Formation of the Karoo Supergroup and the Witteberg Group, both part of the Cape Supergroup. A site survey, joint analysis, core logging and laboratory testing on rock specimens formed part of the Geotechnical Investigation. Laboratory tests included unconfined compression strength and point load tests. The data obtained from the fieldwork and laboratory analysis were used to determine the rock quality designation value of the rock, which was subsequently combined with the other parameters to obtain a rock mass rating. All data were utilised to develop a model for best practice construction (e.g. excavated vault in solid rock versus a concrete structure against rock face), as well as to develop a preliminary design for the vault. The results of the Geotechnical Investigation indicate that the site is suitable for the proposed project.

  • Geotechnical Investigation for the construction of a vault in a rockface for the placement of a gravimeter and a long period seismograph at matjiesfontein, South Africa
    South African Journal of Geology, 2011
    Co-Authors: L. Croukamp, J. J. Rossouw, Coenrad J. Fourie, L. Combrinck
    Abstract:

    The aim of the project is to investigate the rock mass parameters at a site in the vicinity of Matjiesfontein (Western Cape Province) so as to ascertain the suitability for the construction of a vault in a rock face. This vault will host a permanent LaCoste and Romberg ultrasensitive gravimeter as well as a long period seismograph. The site is close to the contact between the Dwyka Formation of the Karoo Supergroup and the Witteberg Group, both part of the Cape Supergroup. A site survey, joint analysis, core logging and laboratory testing on rock specimens formed part of the Geotechnical Investigation. Laboratory tests included unconfined compression strength and point load tests. The data obtained from the fieldwork and laboratory analysis were used to determine the rock quality designation value of the rock, which was subsequently combined with the other parameters to obtain a rock mass rating. All data were utilised to develop a model for best practice construction (e.g. excavated vault in solid rock versus a concrete structure against rock face), as well as to develop a preliminary design for the vault. The results of the Geotechnical Investigation indicate that the site is suitable for the proposed project. © 2011 December Geological Society of South Africa.

Alireza Malehmir - One of the best experts on this subject based on the ideXlab platform.

  • geophysical assessment and Geotechnical Investigation of quick clay landslides a swedish case study
    Near Surface Geophysics, 2013
    Co-Authors: Alireza Malehmir, Mehrdad Bastani, Charlotte M Krawczyk, Ulrich Polom, Marcus Gurk, Nazli Ismail, Lena Persson
    Abstract:

    We present a preliminary assessment of the potential utility of various geophysical measurements carried out over a quick-clay landslide site in south-west Sweden. The multidisciplinary approach includes active P- and S-wave seismic Investigations, including 2D and 3D reflection and refraction surveys, passive single and 3C seismic surveys, electrical resistivity tomography and electromagnetic surveys including controlled-source and radio-magnetotellurics, ground-penetrating radar and potential field studies. The P-wave and particularly S-wave reflection seismic data show a highresolution image of bedrock topography and the stratigraphy of a 100 m thick sequence of sediments that lies on top, which include lightly consolidated quick-clays. Of particular interest is the identification of a layer of relatively coarse-grained material between 10–20 m below the ground surface. Geotechnical Investigations indicate that most but not all quick-clays at the site are located above this layer. Further studies are required to determine the importance of their relationship and whether the coarse-grained layer may have had a role in triggering quick-clay landslides in the region. Geoelectrical and electromagnetic methods provide high-resolution images of the unconsolidated subsurface and particularly the normal and leached clays. Radio-magnetotelluric methods proved valuable near the river where traditional geoelectrical methods failed to provide sufficient depth coverage. The study shows that geophysical data are able to image major subsurface structures associated with quick-clay landslides.

  • a multidisciplinary geophysical and Geotechnical Investigation of quick clay landslides in sweden
    Seg Technical Program Expanded Abstracts, 2013
    Co-Authors: Alireza Malehmir, Silvia Salas Romero, Chunling Shan, Emil Lundberg, Christopher Juhlin, Mehrdad Bastani, Lena Persson, Charlotte M Krawczyk, Ulrich Polom, A Adamczyk
    Abstract:

    Summary Landslides are one of the most commonly occurring natural disasters. They claim hundreds of human lives and cost billions of dollars every year. In order to provide geophysical tools and techniques to better characterize sites prone to slide, we have been carrying out and evaluating potential utility of several geophysical surveys over a quick clay landslide site in southwest Sweden since 2011. The measurements include 2D and 3D P- and S-wave high resolution surface seismics, radio- and controlled-source electromagnetics, geoelectrics, ground gravity and magnetic surveys. A particular focus here is given to the seismic studies in the site. Combined with downhole geophysical and Geotechnical measurements, we show that majority of reflections correlate well with sandy-silty formations in the site. Quick clays often occur above these formations, which may be an indication of the role of coarse-grained formations to not only partly form quick clays but also triggering them when pore-water pressure is significantly increased.

J. J. Rossouw - One of the best experts on this subject based on the ideXlab platform.

  • Geotechnical Investigation FOR THE CONSTRUCTION OF A VAULT IN A ROCKFACE FOR THE PLACEMENT OF A GRAVIMETER AND A LONG PERIOD SEISMOGRAPH AT MATJIESFONTEIN, SOUTH AFRICA
    South African Journal of Geology, 2011
    Co-Authors: L. Croukamp, J. J. Rossouw, Coenrad J. Fourie, L. Combrinck
    Abstract:

    The aim of the project is to investigate the rock mass parameters at a site in the vicinity of Matjiesfontein (Western Cape Province) so as to ascertain the suitability for the construction of a vault in a rock face. This vault will host a permanent LaCoste and Romberg ultra-sensitive gravimeter as well as a long period seismograph. The site is close to the contact between the Dwyka Formation of the Karoo Supergroup and the Witteberg Group, both part of the Cape Supergroup. A site survey, joint analysis, core logging and laboratory testing on rock specimens formed part of the Geotechnical Investigation. Laboratory tests included unconfined compression strength and point load tests. The data obtained from the fieldwork and laboratory analysis were used to determine the rock quality designation value of the rock, which was subsequently combined with the other parameters to obtain a rock mass rating. All data were utilised to develop a model for best practice construction (e.g. excavated vault in solid rock versus a concrete structure against rock face), as well as to develop a preliminary design for the vault. The results of the Geotechnical Investigation indicate that the site is suitable for the proposed project.

  • Geotechnical Investigation for the construction of a vault in a rockface for the placement of a gravimeter and a long period seismograph at matjiesfontein, South Africa
    South African Journal of Geology, 2011
    Co-Authors: L. Croukamp, J. J. Rossouw, Coenrad J. Fourie, L. Combrinck
    Abstract:

    The aim of the project is to investigate the rock mass parameters at a site in the vicinity of Matjiesfontein (Western Cape Province) so as to ascertain the suitability for the construction of a vault in a rock face. This vault will host a permanent LaCoste and Romberg ultrasensitive gravimeter as well as a long period seismograph. The site is close to the contact between the Dwyka Formation of the Karoo Supergroup and the Witteberg Group, both part of the Cape Supergroup. A site survey, joint analysis, core logging and laboratory testing on rock specimens formed part of the Geotechnical Investigation. Laboratory tests included unconfined compression strength and point load tests. The data obtained from the fieldwork and laboratory analysis were used to determine the rock quality designation value of the rock, which was subsequently combined with the other parameters to obtain a rock mass rating. All data were utilised to develop a model for best practice construction (e.g. excavated vault in solid rock versus a concrete structure against rock face), as well as to develop a preliminary design for the vault. The results of the Geotechnical Investigation indicate that the site is suitable for the proposed project. © 2011 December Geological Society of South Africa.