What are the essential components of a borehole log?

A log must include project details, coordinates, ground level, borehole diameter, water table, strata description, sample types with depth and number, and in-situ test results like SPT 'N' values (Clause 6).

What are the main methods of subsurface exploration covered?

The code details methods including test pits, trenches, and various types of boring (auger, wash, rotary) and drilling (percussion, rotary) (Clause 4).

How do I choose an exploration method?

The selection depends on the purpose of the investigation, type of ground expected, required depth, and the type of samples or in-situ data needed, as guided by Table 1.

What is the purpose of borehole logging?

To create a permanent, standardized record of the subsurface conditions encountered, which forms the primary basis for geotechnical analysis and foundation design (Clause 6).

IS 10883

: 1984

Code of practice for selection of exploration methods and bore-hole logging procedures for underground investigations

CurrentFrequently UsedCode of PracticeBIMGeotechnical · Surveying and Geotechnical Investigation

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This code of practice provides guidance on the selection of suitable exploration methods and standardizes the procedures for logging data obtained from boreholes during underground investigations. It covers the planning of exploration, different methods like boring and drilling, and the essential details to be recorded for characterizing soil and rock strata for civil engineering projects.

Provides guidance on the selection of appropriate exploration methods and bore-hole logging procedures for various underground investigations.

Quick Reference Values

Typical borehole spacing for compact building site10 m to 30 m

Minimum depth of exploration below foundation base1.5 times the width of foundation

Acceptable area ratio for undisturbed samplers< 10%

Recommended minimum inside clearance for samplers1.0% to 3.0%

Commonly used undisturbed sample (Shelby tube) diameter75 mm or 100 mm

Practical Notes

This code should be read in conjunction with IS 1892 for a comprehensive approach to subsurface investigations for foundations.

The accuracy of the borehole log is paramount; ensure all details, including water levels, strata changes, and sample depths, are recorded meticulously on-site.

The choice between disturbed (e.g., from SPT) and undisturbed (e.g., from Shelby tube) sampling depends entirely on the specific laboratory tests planned.