Developing Production Pile Driving Criteria from Test Pile Data (2011) / Chapter Skim
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Pages 47-54
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47 The practices used by transportation agencies to develop pile driving criteria for production pile installation as identified in the previous two chapters can be described as highly variable in terms of the level and sophistication of the testing performed. To some extent, such variability in test pile requirements may reflect the inherent variety of project size, complexity, ground conditions, pile type, etc.
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equation analysis was used to evaluate the contractor's driving system to determine if it was adequate to install the piles to the specified resistance. In some cases, this drivability analysis was performed by the agency post-bid, when the contractor made its equipment submittals.
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49 USE OF PRE-PRODUCTION VERSUS PRODUCTION TEST PILES Most state transportation agencies do not routinely utilize preproduction test piles. A typical practice is to use a production pile as a test pile, sometimes the first production pile at a given location.
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resistance from a pile on initial drive or from a blow on redriving the pile with the back-calculated side resistance from the early blows at the beginning of restrike. This practice is perceived to overcome the limitations of HSDT related to the reduction in side resistance observed during driving that may occur before full mobilization of the base resistance.
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51 establish the relationship of resistance increase with time (setup) for a given site.
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integrate combinations of dynamic formulas and/or wave equations with measurements from test piles that often include HSDT (usually with signal-matching analyses) , and sometimes SLT to arrive at final criteria for production pile installation.
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53 Graduated Approach: Formula–HSDT–SLT (California DOT -- Caltrans) There are three typical pile sizes and associated processes: (1)
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SUMMARY This chapter summarized a number of useful practices identified and employed by transportation agencies to develop pile driving criteria from test piles, and described limitations and impediments to more widespread application of these useful practices. The most common limitation to improvements in practice for many cases is the perception of limited benefits relative to costs associated with technologies that require significant commitment of resources or time.
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