1. Department of Civil Engineering, University of Pretoria, Cnr. Lynnwood Rd. and Roper St., Hatfield, Pretoria, Gauteng, 0028, South Africa (Corresponding author), e-mail: yashay.narainsamy@tuks.co.za, https://orcid.org/0000-0002-1864-3317
2. Department of Civil Engineering, University of Pretoria, Cnr. Lynnwood Rd. and Roper St., Hatfield, Pretoria, Gauteng 0028, South Africa, https://orcid.org/0000-0003-0094-2404 (R.A.M.)
3. Geotechnical Engineering Department, Jones and Wagener Engineering and Environmental Consultants, 59 Bevan Rd., Rivonia, Johannesburg, Gauteng 2128, South Africa