The same is illustrated as curve (b) in Fig.13.
9. Conclusions
From the curve it can be easily see that earlier stated limitation applies here also for diameter greater than 900 mm and below 600 mm. Author strongly feels that we specify permissible settlement at 1.5 times the safe/allowable load as certain percent of pile diameter.
Innovations are “key” to success. Fortunately Indians are very capable of innovations in any field. Unfortunately they are not encouraged by the Management or Governments as is the case of developed countries particularly USA. In this paper, the author has illustrated many innovations developed by him in Foundation Engineering. Intentionally he has illustrated all but one very simple innovations to bring out how even these simple innovations can improve quality, sustainability, speed of execution and reduced the cost. He has illustrated only one innovation which is more thought provoking and needed extreme care during execution. The Author sincerely believes that this paper will encourage young students and engineers to the path of innovations.
10. References Fig.13: The Limitations of the revised BIS Code: IS 2911 Part 4:2013 on permissible settlement of the pile at 1.5 times the design load
It could be 3% pile diameter as in curve (c ) of Fig.13 or 2% pile diameter as in curve (d) of Fig.13. Still more rational approach would be to specify permissible settlement at design/safe load as “elastic settlement of pile shaft at design/ safe load (to be estimated) plus n (diameter of the pile)” where n could be 2% of pile diameter or conservatively even 1.5% of pile diameter.
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Number 4 December 2015
1. Bureau of Indian Standards, IS 2911 Part 1 Section 2, 2010. 2.
Bureau of Indian Standards, IS 2911 Part 4 1985.
3. Bureau of Indian Standards, IS 2911 Part 4, 2013. 4.
Cole, K.W. and M.A. Stroud (1976) “Rock Socket Piles at Coventry” Geotechnique Vol. XXVI No.1.
5.
Nayak, N.V. (2015) “Foundation Design Manual- 7th Edn. Dhanpatrai Publications.
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