How to interpret soil boring logs for bored pile depth design

A practical guide to reading Standard Penetration Test (SPT N-value) logs to determine pile founding levels and skin friction capacity.

Soil boring log chart and geotechnical soil test report
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Interpreting SPT N-values

Stiff clay yields N-values 10-30 while dense sand yields N-values >30, allowing precise calculations of skin friction and end bearing.

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