oa Civil Engineering = Siviele Ingenieurswese - The design of foundations for roads in South Africa
In brief outline, the methods of foundation design currently in use are presented. The importance of the soil survey as a preliminary to design is stressed as well as the identification and classification of soils. The C.B.R. test on soaked samples provides the principal design criteria and is so arranged as to enable an estimate to be made of the ultimate in situ C.B.R. of the constructed foundations. The wheel load design Curves used for design are based upon American practice, but test results are applied using judgment and experience of local factors. Unreliable design results have led to checking of designs using the resistance value and the group index methods of design. Special tests are used for decomposed materials and shales and for cement and lime stabilized soils for use in base courses. Further research is essential to develop locally applicable design data and to make the best use of local sources of foundation materials.
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