Browsing Civil Engineering by UP Author "Jacobsz, Schalk Willem"

Browsing Civil Engineering by UP Author "Jacobsz, Schalk Willem"

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  • 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 ...
  • The influence of foundation stiffness on the behaviour of surface strip foundations on sand 
    Lemmen, H.E.; Jacobsz, Schalk Willem; Kearsley, Elsabe P. (South African Institution of Civil Engineering, 2017-06)
    The objective of this study was to determine whether the contact stress distribution underneath a strip footing on dense cohesionless sand can be predicted as a function of the properties of the footing and that of the ...
  • The influence of soil suctions on the deformation characteristics of railway formation materials 
    Schulz-Poblete, Mario Vincent; Grabe, Petrus Johannes; Jacobsz, Schalk Willem (Elsevier, 2019-03)
    Changing climatic conditions worldwide are causing changes in moisture conditions of railway formations and slopes, thereby either strengthening or weakening them. Current railway formation design methods do not take into ...
  • Investigation of piled foundations in swelling clays 
    Gaspar, Tiago Alexandre Valentim; Jacobsz, S.W. (Schalk Willem); Osman, Ashraf S. (EDP Sciences, 2023)
    This paper presents the results of element testing and centrifuge modelling to investigate the behaviour of piled foundations in swelling clays. The study revealed that the preparation procedure implemented, was able to ...
  • Leak detection on water pipelines in unsaturated ground by discrete fibre optic sensing 
    Jacobsz, Schalk Willem; Jahnke, Sebastian Ingo (Sage, 2020-07)
    The article describes a study using discrete fibre optic sensing as a means of leak detection on water distribution pipes installed in unsaturated ground. A short length of pipe fitted with artificial leak points was ...
  • The mass stiffness of residual dolomite from large surcharge trials 
    Jacobsz, Schalk Willem (The Geological Society of London, 2013-02)
    In South Africa, the stiffness of dolomite residuum has traditionally been viewed as relatively low. For reasons of economy, available dolomite residuum stiffness data mostly stem from plate load tests on each of the ...
  • Measurement of pile uplift forces due to soil heave in expansive clays 
    Da Silva Burke, Talia Simone; Jacobsz, Schalk Willem; Elshafie, M.Z.E.B.; Osman, A.S. (Canadian Science Publishing, 2022-12)
    Piled foundations are widely used to limit the movement of foundations in expansive clays. These piles are subjected to large uplift forces as the clay swells (and downdrag forces when it shrinks). The appropriate method ...
  • Modelling horizontally loaded reinforced-concrete piles in a geotechnical centrifuge 
    Louw, Hendrik; Kearsley, Elsabe P.; Jacobsz, Schalk Willem (ICE Publishing, 2022-01-17)
    The design of pile foundations to accommodate horizontal loads is a complex soil−structure interaction problem. Current small-scale laboratory testing of pile foundations is mostly focused on metal piles, which raises the ...
  • Optimal placement of reinforcement in piggyback landfill liners 
    Marx, D.H. (David); Jacobsz, Schalk Willem (Elsevier, 2018-06)
    The optimal placement of geogrid reinforcement in clay liners subject to differential settlement was investigated both numerically and with centrifuge modelling. Two unreinforced liners, a liner reinforced at the top-quarter ...
  • Performance of the tensiometer method for the determination of soil-water retention curves in various soils 
    Le Roux, P.F.; Jacobsz, Schalk Willem (ASTM International, 2021-07-01)
    The soil-water retention curve (SWRC) describes the relationship between the soil matric suction and the water content of an unsaturated soil. It is an essential tool in geotechnical engineering and agriculture and is, ...
  • Pile displacement measurement using digital image correlation 
    Marx, Dawie; Jacobsz, Schalk Willem; van Eeden, Stephan (South African Institution of Civil Engineering, 2018-04)
    Digital image correlation (DIC) is a non-intrusive measurement technique whereby the relative displacement of a target object between successive digital images is measured. In geotechnical research the technique is typically ...
  • Pore pressure response during tube sampling in gold tailings 
    McDonald, Gregory Darren; De Lange, Wallace; Jacobsz, S.W. (Schalk Willem) (EDP Sciences, 2023)
    Capturing the in-situ state of mine tailings is important in determining its behaviour under loading for evaluating the risk of failure of tailings dams. Obtaining a high-quality undisturbed sample through tube sampling ...
  • A qualitative model study on the effect of geosynthetic foundation reinforcement in sand overlying very soft clay 
    Jones, Brendon Ronald; Jacobsz, Schalk Willem; Van Rooy, Jan Louis (South African Institution of Civil Engineering, 2016-06)
    A centrifuge model study was carried out investigating the effects of the inclusion of geogrid reinforcement in a sand layer constructed over a thin, very soft clay layer to facilitate the construction of warehouse floors ...
  • Remote monitoring of a tailings dam using the Internet of Things 
    Jacobsz, Schalk Willem; Broekman, Andre; Basson, Jack Adriaan; Vandoorne, Rick; Vermaak, Jan (South African Institution of Civil Engineering, 2020-08)
    Due to their size and often their remoteness, large geotechnical structures such as tailings dams are ideally suited to be observed using smart monitoring technologies. With the arrival of the 4th Industrial Revolution ...
  • Safe, fast and simple : the DUKTUS pile is load-tested in South Africa 
    Jacobsz, Schalk Willem; Rossiter, Dave; Marsden, Rob (South African Institution of Civil Engineering, 2012-04)
    Introducing modern technologies into an existing market can be a challenge, but most would agree that the recipe for success must bring together simplicity, technical performance, time savings, high safety and quality ...
  • TD-DAQ : a low-cost data acquisition system monitoring the unsaturated pore pressure regime in tailings dams 
    Basson, Jack; Broekman, Andre; Jacobsz, Schalk Willem (Elsevier, 2021-10)
    Tailings dams are large, often self-contained, storage facilities of mine residue. On self-contained tailings dams the tailings material itself is used to raise the containment embankments holding newly deposited residue. ...
  • Towards the application of unsaturated soil mechanics in practice 
    Gaspar, Tiago Alexandre Valentim; Jacobsz, Schalk Willem (South African Institution of Civil Engineering, 2019-04)
    It has long been recognised that the principles of conventional saturated soil mechanics can be an oversimplification of soil behaviour, particularly in the arid climate of southern Africa. This knowledge has led ...
  • TUKS tensiometer measures to –1.7 Mega Pascal 
    Jacobsz, Schalk Willem (South African Institution of Civil Engineering, 2019-01)
    Tensiometers have been used in agriculture for many years, as the magnitude of pore water suction affects the ease with which plants can absorb water from the soil. They have, however, traditionally been limited to the ...
  • Updating structural reliability efficiently using load measurement 
    De Koker, Nico; Viljoen, C.; Lenner, Roman; Jacobsz, Schalk Willem (Elsevier, 2020-05)
    The observation of an existing structure supporting a particular maximal load provides a direct constraint on the possible range of values its resistance capacity may take. The implied update of structural reliability ...