Borehole Log (Bore Log)
Depth-wise record of strata, SPT N-values, samples + water table in a borehole
A borehole (bore) log is the formal depth-wise record produced as a borehole is drilled — it tabulates each stratum's description and thickness, the depth and type of every sample, SPT N-values at each test depth, ground-water level (on striking and after stabilisation), and any drilling observations (cavities, loss of water, refusal). IS 1892 standardises its content and presentation.
The set of bore logs across the site is the primary raw output of the investigation; the geotechnical engineer interprets them — with the lab results — into design parameters and the recommended foundation. Accurate, contemporaneous logging matters: mislabelled depths or missed water tables propagate into wrong bearing capacity, pile lengths and dewatering, and the logs are key evidence in any later foundation dispute.
- Primary record of every geotechnical borehole
- Deriving SBC / pile capacity + foundation depth
- Cross-section + stratigraphy preparation
- Tender geotechnical baseline + risk allocation
- Forensic + dispute documentation