Geotechnical Methodology

The geotechnical studies shall be conducted in three staged approach, namely through (a) desk study, (b) excavation of test hole/s and (c) Dynamic Cone Penetrometer and (d) Laboratory testing in a SANAS accredited laboratory.

Regional Geology

The regional geology shall be described from the published Geology of South Africa Maps (at a suitable scale at regional and local conditions) and Literature reviews from published Geology of South Africa books published by Council for Geo-Science. Site-specific geology will be determined at the time of the excavation of test holes.

Final Geotechnical reporting

Laboratory results will take about 4 weeks to be received back from the SANAS accredited laboratory. The final geotechnical report will be issued within the 4 weeks mention above counted from the sampling date.


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Final Geotechnical reporting

The final geotechnical and foundations evaluations shall be prepared utilising these latest industry standards, these are: a) South African National Standard (SANS 10400-H: 2012 Edition 3). The application of the National Building Regulations. Part H: Foundations. SABS Standard Division; and b) South African National Standard (SANS 633:2012 Edition.1). Soil profiling and rotary percussion borehole logging on dolomite land in Southern Africa for engineering purposes. Published by SABS Standard Division, Pretoria. ISBN 978-0-626-27631-7.

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Geotechnical Evaluations

The geotechnical evaluation will entail the determination of the soils zonation's through the determinations of: Grading of soils and Atturburg Limits; ModAASHTO and California Bearing Ratio (CBR); TRH 14 and Unified Soil Classification; Consolidation tests; UCS; Triaxials; Shearbox tests; and Oedometer testing.


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Limitations

In accordance with the observations made on the Geological Map 1:250 000 Scale Sheet, the study will be assessed for the presence of any occurrence of dolomite and / or dolomitic residuum i.e. chert and wad. Should the presence or occurrence or signs of dolomite and / or dolomitic residuum be encountered during the desk study and site investigations, the findings will be communicated to the client and the implications thereof..


Preliminary reports

The geotechnical preliminary report shall be containing mainly soil profile and site pictures.

Determination of Data Points

According to the publish guideline for Geotechnical Investigations Determinations published by South African Institute for Civil Engineers, Geotechnical Division, January 2010, the following data-points for a liner infrastructure such as road are required as per the stage of the project;

  • Feasibility Stage - 2 data points per kilometre.
  • Design Stage - 5 data points per kilometre − These data-points referred above could be tested by various geotechnical investigation methods, that is, either excavation of test holes, Dynamic Cone Penetrometer, Dynamic Probe Super Heavy, Percussion drilling, Diamond Core Drilling etc.

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