I have calculated Liquid Limit, Plastic Limit, Soil type, SPT and Fine Contents.How can it be applied in urban development especially making some zonal maps, risk factors, bearing capacity, settlement & foundation issues etc. I would be grateful if you kindly suggest.
From the parameters you've listed, it is possible to approximate the compression index, strength parameters, soil types, pre-consolldation pressure, re-compression index and many other compression and strength related parameters. These could then be used to help determine settlement, slope stability, bearing pressure. etc.
You can use the Spt value to estimate the liquefaction succeptibiliy map
I would go for SPT as field parameter although there are a lot of qualifications on its corrrect se. LL, PL and gradation will assist you in this provided that they are of the same layer. From thereon you can deduce some strenght parameter for sandy materials with confidence. For microzonation you also need water table level and dynamic testing (field prederably) and triaxial tests. All other will be a hazy approximation.
LL & PL are used to classify the cohesive soils and more over one can have fair idea about the compression index and stress history of soil deposit. SPT is popular insitu test even today to determine the bearing capacity and settlement of cohesionless soils because it is difficult to take undistubed samples.
LL and PL cannot provide an idea on compression and indeed stress history since the fabric is removed by remoulding. I know that there is a number of attempted correlations between plastisity and compression parameters, but those may be only valid in assessing virgin consolidation at a rather significant degree of uncertainty. Overconsolidation is a major issue that LL and PL cannot by definition address. Hence lets limit PL and LL to what they are good at. Classification of soils together with in situ tests like SPT and CPT can help to assess liquifaction potential according to various methodologies and criteria. As said before field dynamic testing is probably the best of field tests for microzonation, but I realise the cost factor is high. So for microzonation, classification tests and SPT (and CPT if available) are a good start. Many thanks, GT.
The first step is to perform geological profiles to see the nature of the earth. Then you record the groundwater level. In the third step, you analyze the properties of each type of soil ,depending on depth and humidity.CPT helps you if you have noncohesive soil.
From SPT and CPT tests you would obtain the liquefaction potential .
Hi,
The stress- strain behaviour in various states that defined by this indexes are totally different.
Check the following reference Please.. it might's assist you in your question …
https://www.dot.ny.gov/divisions/engineering/technical-services/technical-services-repository/GTM-7b.pdf
I sincerely acknowledge each and everyone's suggestion related to my query. Also, sincerely apologise for late reply.
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