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During the geotechnical investigation of the site in Qn(1)… Solved:

During the geotechnical investigation of the site in Qn(1) above, the geotechnical engineer proposed a standard penetration test (SPT) to be done on some critical boreholes to aid the prediction of the bearing strength of the foundation soil. The field data are as shown in the table below. The ground water table was at 15m below the ground. Borehole Number Depth of SPT (m) Field SPT-N-Values BH – 01 3.0  –  3.45 6.0  –  6.45 9.0  –  9.45 7 10 29 BH – 02 3.0  –  3.45 6.0  –  6.45 9.0  –  9.45 8 11 36 I. Using the field SPT-N values, define the consistency of soil in BH-01 and BH-02 in the SPT sections tested(Cohesive soils). II. Perform the analysis(using Bowles Approach) for footing widths; B=1.0m and B=2.0m to predict the in-situ ultimate bearing strengths in the SPT sections of critical Bore holes selected. III. Predict the allowable bearing strength from the ultimate bearing strength using a factor of safety, FS=3.0. IV. Comment on the variating of the predicted in-situ bearing strength with respect to increasing footing width and also the foundation soil depth. Solution...

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