Browsing University of Pretoria: Research Output by UP Author "Jacobsz, Schalk Willem"

Browsing University of Pretoria: Research Output by UP Author "Jacobsz, Schalk Willem"

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  • Analysis of maximum arching conditions in active plane-strain trapdoors in sand 
    Osman, Ashraf S.; Jacobsz, Schalk Willem (Elsevier, 2019-09)
    The trapdoor problem is a useful model to understand the stress distribution around geo-structures. This paper focuses on evaluating the conditions of maximum arching (minimum loads on trapdoors) developing during the ...
  • Application of unsaturated soil mechanics – two years on 
    Gaspar, Tiago Alexandre Valentim; Vandoorne, Rick; Jacobsz, Schalk Willem; Heymann, Gerhard; Grabe, Petrus Johannes (South African Institution of Civil Engineering, 2021-04)
    In recent years, technological advancements in the field of unsaturated soil mechanics have helped improve understanding in this field for both researchers and engineering practitioners. Gaspar & Jacobsz (2019) ...
  • The behaviour of a reinforced soil mattress spanning a cavity modelled in a geotechnical centrifuge 
    Van Dyk, C.; Jacobsz, Schalk Willem (Springer, 2016-10)
    Sinkholes can occur on land underlain by dolomite and cause substantial damage to buildings and even loss of life. More than four million people work or reside on dolomite land in South Africa and it is therefore important to ...
  • Brazilian tensile strength test conducted on ductile unsaturated soil samples 
    Gaspar, Tiago Alexandre Valentim; Jacobsz, Schalk Willem (ASTM International, 2021-05)
    The tensile strength of soil is often neglected. Because of the presence of matric suction, unsaturated soils may have substantial tensile strengths with implications for a range of geotechnical problems, such as slope ...
  • Centrifuge and numerical modeling of liquefied flow and nonliquefied slide failures of tailings dams 
    Charles, W.W.; Crous, Petrus A.; Jacobsz, Schalk Willem (American Society of Civil Engineers, 2023-09)
    Tailings dams have relatively high failure rates throughout the world and the consequences of these failures often result in significant loss of life and damage to the environment and property. However, the triggers and ...
  • A centrifuge for TUKS 
    Jacobsz, Schalk Willem (South African Institution of Civil Engineering, 2012-04)
    No abstract available.
  • Centrifuge modelling of a soil nail retaining wall 
    Jacobsz, Schalk Willem (South African Institution of Civil Engineering, 2013-04)
    This paper describes a physical model of a soil nail retained excavation face which was tested in the new geotechnical centrifuge at the University of Pretoria. As centrifuge modelling is new in South Africa, a short ...
  • Centrifuge modelling of an expansive clay profile using artificial fissuring to accelerate swell 
    Gaspar, Tiago Alexandre Valentim; Jacobsz, S.W. (Schalk Willem); Smit, G.; Gens, A.; Toll, D.G.; Osman, A.S. (Elsevier, 2023-01)
    This paper presents the results of a centrifuge study in which swell of an expansive clay profile was induced in the centrifuge. A factor which has previously hindered such research is the time required to induce significant ...
  • Centrifuge modelling of piled foundations in swelling clays 
    Gaspar, Tiago Alexandre Valentim; Jacobsz, Schalk Willem; Smit, G.; Osman, A.S. (Canadian Science Publishing, 2024-01)
    A study aimed towards assessing the variation in shaft capacity of piled foundations in swelling clays is presented. At the clay's in-situ water content, the results of pull-out tests on short-length piles revealed no ...
  • Centrifuge modelling of railway embankments under static and cyclic loading 
    Vorster, P.; Grabe, Petrus Johannes; Jacobsz, Schalk Willem (Southern African Institute for Industrial Engineering, 2017-09)
    With past embankment failures on the heavy haul coal export railway line between Ermelo and Richards Bay in South Africa, a study was conducted focusing on the modelling of embankments in a geotechnical centrifuge. This ...
  • Comparing the factors of safety from finite element and limit equilibrium analyses in lateral support design 
    Potgieter, Jean; Jacobsz, Schalk Willem (South African Institution of Civil Engineering, 2019-12)
    Soil-nails and anchors as means of lateral support in surface excavations require stability analyses as part of design. Generally, the acceptance criterion is some arbitrary ‘factor of safety’ which can be routinely ...
  • Condition assessment of reinforced concrete beams – comparing digital image analysis with optic fibre Bragg gratings 
    Kearsley, Elsabe P.; Jacobsz, Schalk Willem (EDP Sciences, 2018)
    Reinforced concrete is the most widely used construction material and thus effective condition assessment of reinforced concrete elements forms a significant part of structural health monitoring. An effective structural ...
  • Discrete element model study into effects of particle shape on backfill response to cyclic loading behind an integral bridge abutment 
    Ravjee, Sachin; Jacobsz, Schalk Willem; Wilke, Daniel Nicolas; Govender, Nicolin (Springer, 2018-11)
    The discrete element method, implemented in a modular GPU based framework that supports polyhedral shaped particles (Blaze-DEM), was used to investigate effects of particle shape on backfill response behind integral bridge ...
  • The effect of overburden and confined stress state on cave mining propagation 
    Schoeman, Nicholas Kyle; Jacobsz, Schalk Willem; Kearsley, Elsabe P. (Southern African Institute of Mining and Metallurgy, 2022-11)
    A physical modelling approach was adopted to simulate the process of cave mining propagation at various horizontal to vertical stress state ratios, and image data was captured and used to characterize the resulting failure ...
  • Electricity generation as a beneficial post-closure land use option for a dormant tailings storage facility 
    Van Eeden, S.J.; Jacobsz, Schalk Willem; Rust, M.; Rust, Eben (South African Institution of Civil Engineering, 2016-03)
    Dormant tailings storage facilities (TSFs) have negative effects on their surrounding environments and communities. This study is aimed at determining the financial and practical feasibility of generating energy from the ...
  • Field and laboratory research into the undrained behaviour of tailings at the University of Pretoria 
    Jacobsz, Schalk Willem; Narainsamy, Yashay (Southern African Institute of Mining and Metallurgy, 2022-06)
    Several high-impact tailings dam failures around the world in recent years have placed a renewed focus on the stability of tailings dams and pointed to potential shortcomings in traditional drained design and safety ...
  • Finite element versus limit equilibrium methods for analysis of lateral support 
    Potgieter, Jean; Jacobsz, Schalk Willem (South African Institution of Civil Engineering, 2018-07)
    Soil-nails and anchors as means of lateral support in surface excavations require stability calculations during design. Generally, the acceptance criterion for such calculations is some arbitrary “factor of safety” (FoS).
  • Fly-by-Pi : open source closed-loop control for geotechnical centrifuge testing applications 
    Broekman, Andre; Jacobsz, Schalk Willem; Louw, Hendrik; Kearsley, Elsabe P.; Gaspar, Tiago Alexandre Valentim; Da Silva Burke, Talia Simone (Elsevier, 2020-10)
    Geotechnical centrifuges are valuable instruments for physical modelling of complex geotechnical problems in a controlled laboratory setting. In comparison to full-scale testing, scaled models are cost effective to construct ...
  • Fracture banding in caving mines 
    Cumming-Potvin, D.; Wesseloo, J.; Jacobsz, Schalk Willem; Kearsley, Elsabe P. (Southern African Institute of Mining and Metallurgy, 2016-08)
    The Duplancic model of caving is widely accepted in industry and is the framework within which most monitoring and numerical modelling results in caving mines are interpreted. As a result, the damage profile ahead of the ...
  • A geotechnical centrifuge for TUKS 
    Jacobsz, Schalk Willem (South African Institution of Civil Engineering, 2011-04)
    The Department of Civil Engineering at the University of Pretoria has recently been awarded a grant from the National Research Foundation (NRF) to acquire a geotechnical centrifuge. Geotechnical centrifuges are used ...