According to IS 1892:2021, for a compact building site of about 0.4 hectare area, what is the recommended minimum number and location of boreholes or test pits for soil investigation?
One borehole or test pit at each corner and one at the center
The problem requires understanding the guidelines for soil investigation on a compact building site, as per IS 1892:2021 (Code of Practice for Subsurface Investigation for Foundations).
According to IS 1892:2021, the recommended practice for soil investigation involves a strategic placement of boreholes or test pits to adequately assess soil conditions. The guidelines typically suggest that for small sites, like the one in question (0.4 hectare), the boreholes or test pits should be spaced in a manner that captures variability in soil properties across the site.
For a compact site of about 0.4 hectare, it is recommended to:
- Ensure adequate coverage and assessment of the entire area.
- Place boreholes or test pits at critical locations to account for soil variability.
Reviewing the given options:
- Boreholes spaced uniformly every 50 meters over the site: This is a general guideline often applied to larger areas to ensure uniform coverage. However, for a compact site, this may be excessive and not cost-effective.
- One borehole or test pit at the center of the site only: This might miss important variations in soil conditions at the edges or corners of the site, leading to incomplete assessment.
- At least ten boreholes evenly spaced regardless of site size: This strategy does not consider the specific area of the site and may lead to unnecessary expenses without providing significant additional information.
- One borehole or test pit at each corner and one at the center: This is a balanced approach that provides a thorough understanding of the soil at critical points (corners and center) of the site. It effectively accounts for potential variability and ensures an accurate subsurface profile.
Therefore, based on IS 1892:2021, the most suitable strategy for soil investigation on a 0.4 hectare compact building site is to have one borehole or test pit at each corner and one at the center. This option provides a comprehensive evaluation of the site, capturing potential variations in soil conditions effectively.
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