15_HWKTTE 4004c - 5 practical refusal and others driving...

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5 practical refusal and others driving criteria will be discussed in detail in the following sections. Blow count criteria Using the Wave Equation Analysis for Piles (WEAP) the engineer can determine the number of blows per specific penetration to reach a design pile capacity. The blow count has to be averaged for every 250 mm of pile penetration or through the last 10 to 20 blows of the hammer. It should be noted that the driving equipment must be selected in order to provide the required resistance at a blow count ranging from 30 blows per 250 mm to 98 blows per 250 mm. Practical refusal Practical refusal is defined as a blow count of 20 blows per 25 mm for 50 mm of driving. The FDOT specifications recommend that driving ceases after driving to practical refusal conditions for 250 mm. If the required penetration can not be achieved by driving without exceeding practical refusal, other alternates should be considered such as jetting or Preformed Pile Holes. Set-checks and pile redrive
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15_HWKTTE 4004c - 5 practical refusal and others driving...

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