29_HWKTTE 4004c - M P Mass of the Pile D max Maximum...

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19 Gates method The method was the results of a research performed by Marvin Gates, J.M (1957). The basic assumption is that the resistance is directly proportional to the squared root of the net hammer energy. This relationship is presented by (29 s b E e a P h h u log - = (3-6) where P u Static Pile Resistance e h Hammer Efficiency (0.85 used for all Cases) E h Hammer Energy a, b 27 and 1.0 Respectively (English units) s Point Permanent Penetration per Blow - Set A suggested safety factor equal 3.0 is recommended. Combined Wave Mechanics and Energy Conservation Sakai et al. Japanese energy method Sakai’s pile driving formula was developed based on stress-wave theory. According to Sakai, this consideration introduced two advantages, it is theoretically accurate as well as easy to use (Sakai et al., 1996). For a blow by an elastic hammer Sakai et al. recommend (29 s D M M L AE R H P P u - = max 2 (3-7)
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20 where A Pile Cross Sectional Area E Young’s Modulus of Pile Material L P Length of the Pile
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Unformatted text preview: M P Mass of the Pile D max Maximum Penetration of Pile per Blow s Permanent Set Paikowskys method The Paikowsky method or Energy Approach is a simplified energy approach formulation for the prediction of pile resistance based on the dynamic measurements recorded during driving. The basic assumption of the method is an elasto-plastic load displacement pile-soil reaction. The Paikowsky method uses as input parameters the maximum calculated transferred energy and maximum pile displacement from the measured data together with the field blow count. Equation 3-8 presents the solution for the dynamic pile capacity R u (Paikowsky , 1994). ( 29 2 max Set D Set E R m u-+ = (3-8) where R u Dynamic Pile Capacity E m Maximum Energy Entering the Pile D max Maximum Pile Top Pile Movement Set Point permanent penetration per blow The static pile resistance P u can be obtained by...
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29_HWKTTE 4004c - M P Mass of the Pile D max Maximum...

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