Murison, R.A, Gaspar, T.A.V., Heymann, G., Jacobsz, S.W. and Narainsamy Y. (submitted). Geotechnical investigation of a fissured highly expansive clay profile. Proceedings of the 7th International Conference on Geotechnical and Geophysical Site Characterization Barcelona, 18 - 21 June 2024.

Gaspar T.A.V., Murison R. A., Jacobsz S. W., Heymann G. and Osman A. S. (submitted). The behaviour of piles in unsaturated expansive clays under cyclic lateral loading. Proceedings of the XVIII European conference on soil mechanics and geotechnical engineering, ECSMGE 2024.

Islam, M.S. and Heymann, G. (submitted). Use of Rayleigh and Love Waves in Seismic surface wave testing. Journal of the South African Institution of Civil Engineering.

Ntaote, M.C. and Heymann, G. (2023). Experimental comparison of active seismic surface wave tests on shallow and deep bedrock sites. Journal of the South African Institution of Civil Engineering, Vol. 63, no. 3, pp. 27-38. https://dx.doi.org/10.17159/2309-8775/2023/v65n3a3

Murison, R.A. & Heymann, G. (2023). Using shear modulus to predict the bearing capacity of strip foundations on sand. Proceedings of the 8th International Symposium on deformation characteristics of geomaterials. Porto,  September 2023.

Vandoorne, R., Gräbe P.J. and Heymann, G. (2022). Polyethylene glycol and membrane processes applied to suction control in geotechnical osmotic testing, International Journal of Geotechnical Engineering, 16:1, 103-122, DOI: 10.1080/19386362.2021.1962109

Gaspar, T.A.V., Jacobsz, S.W., Heymann, G., Toll, D.G., Gens, A., and Osman, A.S. The mechanical properties of a high plasticity expansive clay (2022). Engineering Geology, Vol. 303. DOI: 10.1016/j.enggeo.2022.106647

Vandoorne, R., Gräbe, P. J. and Heymann, G. (2021). Soil suction and temperature measurements in a heavy haul railway formation. Transportation Geotechnics Vol. 31.DOI: 10.1016/j.trgeo.2021.100675

Gaspar, T., Jacobsz S.W., Vandoorne, R., Heymann, G. and Gräbe P.J. (2021). Application of unsaturated soil mechanics - two years on. Civil Engineering, April 2021, pp. 18 - 21.

Lebitsa, G., Heymann, G. and Rust, E. (2021) Excess pore pressure generation during slurry deposition of gold tailings, International Journal of Mining, Reclamation and Environment, Vol. 35, no. 2, pp. 95-114, DOI: 10.1080/17480930.2020.1761733

Vandoorne, R., Gräbe, P. J. and Heymann, G. (2020). Long-Term In-situ Measurement of Soil Suction in Railway Foundation Materials. International Conference on Transportation Geotechnics, Chicago, USA.

Heymann, G and Chang, N (2019). Settlement prediction for fuel storage tanks founded on reclaimed land. Proceedings of the 17th African Regional Conference on Soil Mechanics and Geotechnical Engineering, Cape Town, pp. 501 - 506.

Mbawala S.J., Heymann G., Roth C.P. and Heyns P.S. (2017). The effect of embedment on a foundation subjected to vertical vibration - a field study. Journal of the South African Institution of Civil Engineering, Vol. 59, no. 4, pp. 26-33. http://dx.doi.org/10.17159/2309-8775/2017/v59n4a3.

Vermeulen, N., Breyl, J and Heymann, G. (2017). Rock mass stiffness from large diameter plate load and CSW tests. Proceedings of the 19th International Conference on Soil Mechanics and Geotechnical Engineering, pp. 669-673, Seoul, Korea.

Heymann G, Rigby-Jones J, Milne C.A. (2017). 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. Journal of the South African Institution of Civil Engineering, No. 59, Vol. 2, pp.49-58. http://dx.doi.org/10.17159/2309-8775/2017/v59n2a6.

Heymann, G., Wilke, D.N. and Kok, S. (2016). Inversion of effective phase velocity seismic surface wave data by partial least squares regression. Geotechnical and Geophysical Site Characterisation 5 - Lehane, Acosta-Martínez & Kelly (Eds), pp. 867-872. Australian Geomechanics Society, Sydney, Australia, ISBN 978-0-9946261-2-7.

Heymann, G. (2016). Typical strength properties of South African soils. Proceedings of the First Southern African Geotechnical Conference, Sun City, South Africa, 5 - 6 May 2016, pp. 289 - 294. Jacobsz (Ed.), Taylor and Francis, ISBN 978-1-138-02971-2.

Archer, A and Heymann, G. (2015). Using small‑strain stiffness to predict the load-settlement behaviour of shallow foundations on sand. Journal of the South African Institution of Civil Engineering. Vol. 57 No 2, June 2015, pp. 28-35, Paper 1165. DOI: 10.17159/2309-8775/2015/v57n2a4.

Barnard, H.F.T. and Heymann, G. (2015). The effect of bedding errors on the accuracy of plate load tests. Journal of the South African Institution of Civil Engineering. Vol. 57 No 1, pp. 67-76, Paper 1021.

Wilke, D.N., Kok, S. and Heymann, G. (2014). Comparison of two inverse strategies to characterize soil profiles, Proceedings of the 4th International Conference on Engineering Optimization (EngOpt2014), pp. 1005-1010, Lisbon, Portugal, 8-11 September, 2014. ISBN: 978-1-138- 02725-1.

Brink, G. and Heymann, G. (2014). Soil collapse from an effective stress perspective. Journal of the South African Institution of Civil Engineering, Vol. 56, No 3, pp. 30 - 33.

Kok, S., Wilke, D.N. and Heymann, G. (2014). Numerical strategies to compute the roots of the secular function of Rayleigh waves, Proceedings of the Ninth South African Conference on Computational and Applied Mechanics (SACAM 2014), 14 - 16 January 2014, Somerset West, South Africa. ISBN: 978-0-620-58994-9.

Archer, A. and Heymann, G. (2014). Optimal free length of bender and extender elements used for seismic testing in geotechnical centrifuges. Proceedings of the 8th International Conference on Physical Modelling in Geotechnics. Gaudin, C. & White , D (Eds.). Vol. 1, CRC Press, Perth, pp. 317-324.

Heymann, G (2013). Vibratory sources for continuous surface wave testing. Geotechnical and Geophysical Site Characterization (ISC'4), Coutinho & Mayne (eds). Taylor and Francis Group, London, pp.1381-1386.

Clayton, C.R.I., Heymann, G. and Matthews, M.C. (2012). The Value of Stiffness Measured in Field Seismic Surveys. International Journal of Geo-Engineering. Vol 4 no. 2, pp.17-36.

Barnard, H. F. T. and Heymann, G (2011). Using a modified plate load test to eliminate the effect of bedding errors. Proceedings of the 15th African Regional Conference on Soil Mechanics and Geotechnical Engineering, Maputo, C. Quadros and S.W. Jacobsz (Eds.), IOS Press, Amsterdam, pp.587-592.

Mbawala, S.J., Heymann, G., Roth, C.P. and Heyns, P.S. (2011). Numerical modelling of wave propagation in ground using non-reflecting boundaries. Proceedings of the 15th African Regional Conference on Soil Mechanics and Geotechnical Engineering, Maputo, C. Quadros and S.W. Jacobsz (Eds.), IOS Press, Amsterdam, pp.644-652.

Chang, H.P.N., Heymann, G. and Clayton C.R.I. (2011). The effect of fabric on the behaviour of gold tailings. Géotechnique, Vol. 61, No. 3, pp.187-197.

Rust, E., Heymann, G. and Jones, G.A. (2009). Collapsible soils: An overview. Civil Engineering, Vol. 18, No. 3, April 2010, ISSN 1021-2000, pp.22-28.

Lebitsa G., Hagan F., Heymann G. and Rust E. (2009). Assessment of Excess Pore Pressures in Gold Tailings. Proceedings of Botswana Institution of Engineers 11th Biennial Conference 07-09 October 2009, pp.273-280.

Rust, E., Heymann, G. and Jones, G.A. (2008). Collapsible soils: An overview. Problem soils in South Africa. South African Institution of Civil Engineering, ISBN 978-0-620-42511-7, pp. 47-56.

Heymann G., Jacobsz S. W., Vorster T. E. B. and Storry R. B. (2008). Comparison of ground stiffness from seismic surface wave and large scale load tests”. Geotechnical and Geophysical Site Characterization (ISC'3). Huang & Mayne (eds), Taylor & Francis, London, pp.843-848.

Heymann, G. (2007). Ground stiffness measurement by the continuous surface wave test. Journal of the South African Institution of Civil Engineering. Vol. 49, no. 1, pp.25-31.

Richards, D.J., Clark, J., Powrie, W, and Heymann, G. (2007). Performance of push-in pressure cells in overconsolidated clay. Proceedings Institution of Civil Engineers, Geotechnical Engineering Vol. 160, no. 1, pp31-41.

Chang, H. P. N. and Heymann, G. (2005) Shear wave velocity of gold tailings. Journal of the South African Institution of Civil Engineering, Vol. 47, no. 2, pp.15-20.

Rust, E., Heymann, G. and Jones, G. A. (2005). Collapse potential of partly saturated sandy soils from the east coast of Southern Africa. Journal of the South African Institution of Civil Engineering, Vol 47, no 1, pp. 8 - 14.

Heymann, G., Clayton, C. R. I. and Reed, G. T. (2005). Triaxial ultra small strain measurements using laser interferometery. Geotechnical Testing Journal, Vol. 28, no. 6, pp.544-552.

Theron M., Clayton C. R. I. and Heymann G. (2004). The small strain stiffness of gold tailings. Geotechnical and Geophysical Site Characterization. Viana da Fonseca and Mayne (eds.). Millpress Rotterdam, pp. 575- 580.

Lloyd, T., Kleynhans, L., Heymann, G. and Rust, E. (2004). Determination of the liquefaction potential of a residue deposit by in-situ testing. 3rd International Mining and Industrial Waste Management Conference. Johannesburg, South Africa. February 2004.

Heymann, G. (2003). The seismic cone penetration tests. Journal of the South African Institution of Civil Engineering. Vol 45, no 2, pp. 26 - 31.

Bolton, H. P. J., Heymann, G., Groenwold, A. A. (2003). Global search for critical failure surface in slope stability analysis. Engineering Optimisation. Vol. 35, No. 1, pp. 51-66.

Clayton, C. R. I., Matthews, C. and Heymann, G. (2003). The Chalk. Characterisation and Engineering Properties of Natural Soils – Tan et al. (eds.) Swets & Zeitlinger, Lisse, ISBN 90 5809 537 1, pp.1403-1434.

Clayton, C.R.I., van der Berg, J.P., Heymann, G., Bica, A.V.D. and Hope, V.S. (2002). The performance of pressure cells for sprayed concrete tunnel linings. Géotechnique, Vol. 52, No. 2, pp. 107-115.

Heymann, G. (2001). Seismic surface wave methods to measure soil stiffness profiles. South African Institution of Civil Engineers, Geotechnical Division: Seminar on Ground Improvement. Johannesburg, South Africa, October, 2001.

Clayton, C. R. I. and Heymann, G. (2001). The stiffness of geomaterials at very small strains. Géotechnique, Vol. 51 No. 3, pp 245-256.

Heymann, G. (2000). Advances in triaxial testing. Journal of the South African Institution of Civil Engineering. Vol. 42, no. 1, pp.24-31.

Clayton, C.R.I., Hope, V.S., Heymann, G. van der Berg, J.P. and Bica, A.V.D. (2000). Instrumentation for monitoring sprayed concrete lined soft ground tunnels in built-up areas. Proc. I.C.E. Geotechnical Engineering, Vol. 143, pp.119-130.

Heymann, G. and Clayton, C. R. I. (1999). Block sampling of soils: Some practical considerations. Geotechnics for Developing Africa. Wardle G. R. et al. (eds.). Proceedings of the 12th African Regional Conference of the ISSMGE. Balkema, Rotterdam, pp.331-339.

van der Berg, J. P., Heymann, G. and Clayton, C. R. I. (1999). The use of embedded pressure cells to monitor geotechnical structures. Proceedings of the 12th Regional Conference for Africa on Soil Mechanics and Geotechnical Engineering. Balkema, Rotterdam, pp.421-426.

Clayton, C. R. I. and Heymann, G. (1999). Stiffness of geomaterials from small strain triaxial and field geophysical tests. 2nd International Symposium on Pre-failure Deformation Characteristics of Geomaterials, Torino. Balkema, Rotterdam. Vol. 1, pp. 65-71.

Heymann, G. (1998). The stiffness of soils and weak rocks at very small strains. PhD thesis, University of Surrey, UK.

Clayton, C.R.I., Bica, A.V.D., Hope, V.S. and Heymann, G. (1998). The use of mercury-filled pressure cells for measuring stresses on and in shotcrete linings. Proceedings of the World Tunnel Congress '98 on Tunnels and Metropolises (ed. Negro, A. and Ferreira, A.A.), Sao Paolo, 25-30 April 1998. Balkema, Rotterdam, 1, 355-360

Heymann, G., Clayton, C. R. I. and Reed, G. T. (1997). Laser interferometry to evaluate the performance of local displacement transducers. Géotechnique, Vol. 47, No. 3, pp.399-405.

Heymann, G. (1995). The strain-controlled borehole shear test apparatus. Proceedings of the 11th African Regional Conference of the ISSMFE. Cairo, Egypt, December 1995, pp.377-382.

Heymann, G. and Jones, G. A. (1995). Excavation classification for labour-intensive works. Civil Engineering, Vol. 3, No. 1, January 1995, ISSN 1021-2000, pp.19-21.

Heymann, G. (1993). Soil nails as lateral support for surface excavations. MEng Dissertation. University of Pretoria, South Africa.

Heymann, G., Rohde, A. W., Schwartz, K. and Friedlaender, E. (1992). Soil nail pull out resistance in residual soils. Proceedings of the International Symposium on Earth Reinforcement Practice, Fukuoka, Japan, November 1992, pp.487-492.