Browsing by UP Author "Heymann, Gerhard"

Browsing by UP Author "Heymann, Gerhard"

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  • The application of continuous surface wave testing for settlement analysis with reference to a full-scale load test for a bridge at Pont Melin, Wales, UK 
    Heymann, Gerhard; Rigby-Jones, J.; Milne, C.A. (South African Institution of Civil Engineering, 2017-06)
    The presence of a significant thickness of soft silts beneath the site of a proposed new road bridge caused concerns over the suitability of shallow foundations. Despite extensive conventional ground investigations, it ...
  • 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) ...
  • Collapse potential of partly saturafed sandy soils from Mozal, Mozambique 
    Rust, Eben; Heymann, Gerhard; Jones, Gary (South African Institution of Civil Engineering, 2005)
    There is an upsurge in development along the eastern coast of southern Africa that creates the need to re-examine the typical red sands which occur from northern Mozambique to the south coast of KwaZulu-Natal in South-Africa.
  • Collapsible soils an overview 
    Rust, Eben; Heymann, Gerhard; Jones, Gary (South African Institution of Civil Engineering, 2010-04)
    Collapse potential in unsaturated soil was first identified and quantified by researchers in South Africa. A landmark paper was published by Ken Schwartz in 1985 presenting the state of the art at that time. Since then, ...
  • The effect of embedment on a foundation subjected to vertical vibration – a field study 
    Mbawalwa, S.J.; Heymann, Gerhard; Roth, C.P. (Chris); Heyns, P.S. (Philippus Stephanus) (South African Institution of Civil Engineering, 2017-12)
    Design of machine foundations requires the prediction of the dynamic response of the foundation system at the frequencies of interest. The response is typically quantified in terms of a number of parameters that include ...
  • The effect of fabric on the behaviour of gold tailings 
    Chang, N.; Heymann, Gerhard; Clayton, C. (Thomas Telford, 2011)
    Undisturbed sampling of gold tailings, especially under the water table, is difficult and in many cases impossible. For this reason laboratory testing of tailings is generally conducted on reconstituted material. It has ...
  • Ground stiffness measurement by the continuous surface wave test 
    Heymann, Gerhard (South African Institution of Civil Engineering, 2007-03)
    The continuous surface wave (CSW) test is a seismic technique for determining ground stiffness by measuring the velocity of Rayleigh wave propagation along the ground surface. A sinusoidal force is generated by a shaker ...
  • The mechanical properties of a high plasticity expansive clay 
    Gaspar, Tiago Alexandre Valentim; Jacobsz, Schalk Willem; Heymann, Gerhard; Toll, D.G.; Gens, A.; Osman, A.S. (Elsevier, 2022-06)
    The mechanical properties of a high plasticity expansive clay from South Africa are reported. The experimental programme considered wetting after loading tests followed by one-dimensional consolidation and unloading of ...
  • Polyethylene glycol and membrane processes applied to suction control in geotechnical osmotic testing 
    Vandoorne, Rick; Grabe, Petrus Johannes; Heymann, Gerhard (Taylor and Francis, 2022)
    The osmotic technique in geotechnical testing of unsaturated soils is a promising technique to control soil-water potential. This technique is an alternative to the axis-translation technique. In this technique an aqueous ...
  • SAICE Journal 
    Heymann, Gerhard (2011-10-27)
    A discusssion of the Journal of the South African Institution of Civil Engineering and its current Open Access status
  • The seismic cone test 
    Heymann, Gerhard (South African Institution of Civil Engineering, 2003)
    The seismic cone test is an in situ test used to measure body wave velocities in soils. Geotechnical parameters that may be derived from the test include void ratio, small strain stiffness and Poisson's ratio. In addition, ...
  • Shear wave velocity of gold tailings 
    Chang, H.P.N.; Heymann, Gerhard (South African Institution of Civil Engineering, 2005)
    To evaluate the liquefaction potential of tailings impoundments, the in situ void ratio and the effective stresses are required. While stresses can be estimated with relative accuracy,the void ratio of tailings has proved ...
  • Soil collapse from an effective stress perspective 
    Brink, George Eksteen; Heymann, Gerhard (South African Institution of Civil Engineering, 2014-10)
    The behaviour of collapsible soil is often quantified by conducting a Collapse Potential Test or double oedometer test. However, these tests interpret the soil behaviour in terms of total stress, while it is well known ...
  • Soil suction and temperature measurements in a heavy haul railway formation 
    Vandoorne, Rick; Grabe, Petrus Johannes; Heymann, Gerhard (Elsevier, 2021-11)
    Transportation foundations around the world exist predominantly in an unsaturated state. Support for the adoption of unsaturated soil mechanics in routine geotechnical engineering is ever-increasing. However, the measurement ...
  • Using small-strain stiffness to predict the load-settlement behaviour of shallow foundations on sand 
    Archer, Andre; Heymann, Gerhard (South African Institution of Civil Engineering, 2015-06)
    Foundation settlement prediction is a challenging task due to the difficulties associated with the quantification of the soil stiffness and the abundance of available analysis methods. Of the different soil stiffness ...