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Short note: Bore hole log

Short answer

A borehole log is a depth-wise written and graphical record of strata encountered during drilling, including descriptions, core recovery, RQD, groundwater level, and in-situ test results. It is used to create geological sections, assess bearing capacity and rock quality, and plan foundation depths and support.

Write a short note on bore hole log.

A borehole log is a written and graphical record of the materials and conditions met while drilling a borehole, drawn depth-wise.

It gives:

  • Borehole number, location, elevation, date and method of drilling.
  • Depth and thickness of each stratum, with description of soil or rock (type, colour, grain size, weathering).
  • Core recovery percentage and RQD, and the position of fractures, cavities or weak zones.
  • Groundwater level and any water loss during drilling.
  • Depths of samples, and results of in-situ tests such as SPT N value.
  • A graphic column using standard symbols.

Uses: to prepare geological sections, assess bearing capacity and rock quality, plan foundation depth, tunnel support and grouting, and to keep a permanent record of the ground.

✓ Answer checked by Claude Opus 5.5 (high effort)

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