Use of Static Cone Penetration Test in Expansive Soil in Sudan

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Khidir Mohamed, Gasm EL Seed
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The use of the static cone penetration test (C. P. T.) as a site investigation tool for classifying potentially expansive soil has been studied with the objective or presenting a field method for the classification of expansive soil The relationship between the C .P .T .parameters cone resistance, qc skin friction , f s and friction ratio, R f as measured by a ten ton static cone penetration machine using an adhesion jacket cone and the swell potential of the investigated soil have been analyzed. A method for classifying potentially expansive soil has been derived from the C.P.T. data. The method utilizes the parameters qc, fs and for the proposed classification. Four swell potential zones have been identified and proposed as a classification criterion. These are: non- expansive zone, low to medium expansive zone, high expansive zone and very high expansive zone. Ranges of skin friction and friction ratio that define the boundaries between these zones were also identified. In addition, the cone resistance was used in this study to define the consistency of the soil. Again ranges of the cone resistance, on the basis of a mathematical correlation between the cone resistance and relative consistency of the soil were obtained to enable an estimate of the consistency of the soil to be calculated from a knowledge of cone resistance, qc.
Static Cone, Penetration Test , Expansive Soil , Sudan