Consider the following objectives related to the sub-surface investigation:

1. To establish the geological profile.

2. To establish Hydrogeological conditions.

3. To monitor future changes in ground conditions through instrumentation.

Which of the above objectives are correct?

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UPSC ESE (Prelims) Civil Engineering 19 Feb 2023 Official Paper
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  1. 1 and 2 only
  2. 2 and 3 only
  3. 1 and 3 only
  4. 1, 2 and 3

Answer (Detailed Solution Below)

Option 4 : 1, 2 and 3
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Detailed Solution

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Explanation:

Objectives of sub-surface investigation:

  1. To establish the geological profile.
  2. To determine engineering properties for the various unit within the eventual ground model.
  3. To establish hydrogeological conditions.
  4. To monitor future changes in ground condition through instrumentation.

 Additional InformationSoil Exploration:

  • The object of site exploration is to provide reliable, specific, and detailed information about the soil and groundwater condition of the site which may be required for a safe and economic design and execution of the engineering work.
  • Generally, soil exploration should be advanced to a depth up to which the increase in pressure due to structural loading will have no damaging effect (such as settlement & shear failure) on the structure. In other words, the depth at which soil does not contribute settlement of the foundation. This depth is termed significant depth

Various factors affecting significant depth are as follow:

  • Type of structure
  • Weight of structure
  • Dimension of structure
  • Disposition of the loaded area
  • Soil profile and layer properties
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