Call For Paper Volume:4 Issue:10 Oct'2017 |

Soil-Pile Bond and SPT values relation for SD Micropile Foundation

Publication Date : 03/09/2015



Author(s) :

Suhas Eknath Tayade , Sandeep Vasanwala.


Volume/Issue :
Volume 2
,
Issue 8
(09 - 2015)



Abstract :

Abstract— Self Drilled Micropile (SDM) constructions are used for special foundations. FHWA design guidelines are helpful for design and construction of SDMF, as no dedicated design code is available for SDM foundation. Now a day’s SDMF is becomes popular construction solution due its benefits of fast and easy construction work using small drilling and grouting machine. Pile foundation design involves two parts, Structural and Geotechnical pile capacity. The structural capacity and its design parameters are easy to handle due to availability of sufficient proven data for reference but the critical part is to envisage geotechnical capacity due to bond strength relation between soil surface and grout body is complicated due to variable soil strata. FHWA design guideline gives range of bond stress values for different soil types and which are underestimated. Technology and material cost is high for SDMF and general used required optimum solution. But designer to designer range of assumed soil pile bond strength values may be more for same soil profile and most of the cases overdesign cause uneconomical solutions. This present paper suggested a method to develop refined bond strength data for SDMF design i. e. a relation between the SPT values and soil bond stress for single soil profile by field tests pile load and SPT values.


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Soil-Pile Bond and SPT values relation for SD Micropile Foundation

August 31, 2015