Activities Involved in the General Soil Investigation Works are described below:
1. Scope:
The purpose of this document is to list out the activities involved in the General soil investigation works.
The extent of site investigation depends primarily upon the nature of contract. If the soil investigation report is given by customer as part of technical documents, additional investigation need not be carried out. If it is contractually required to carry out site investigation, then an expert agency duly approved by client will be entrusted for it.
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2. Relevant Process/Specification:
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Contract specifications
3. Tools/Equipment Required:
As specified by the expert agency to meet the contract requirements.
4. Procedure / Method:
Carry out a site reconnaissance by visual examination to identify prevailing site conditions, adjacent properties, and presence of underground excavations and behaviour of structures similar to those intended.
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Arrange for detailed examination of site by external agency in line with the contract requirements. For this, conduct appropriate tests like drilling techniques, testing of undisturbed samples & disturbed samples/groundwater, standard penetration test, plate bearing test, laboratory tests for liquid limit, plastic limit, chloride and sulphate contents, organic material, as contractually specified.
Soil Investigation:
Standard Procedures: Drilling, sampling and testing shall be performed in accordance with the British Standards, BS 5930 (1981) and BS1377 (1990) or IS: 720, IS 1498 unless otherwise requested.
Ground Water:
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Careful observations are made of the ground water levels. Levels are usually recorded in the morning prior to starting the day’s work.
Pyrometers are installed in those cases where accurate monitoring of ground water levels (tidal or seasonal fluctuations) is required over a period of time.
Ground water samples are taken either before adding drilling water or from a nearby, hand excavated, pit.
In case where water samples are required at depths below ground water level, the borehole is cleaned by bailing out the water several times and it is then left overnight to reach equilibrium. Water samples are then taken at the required depth with a specially designed sampler.