46 of 49 Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements  Section 05: Earth Works, Pipe Works and Ground Improvement  Ultimate Bearing Resistance from Pile Driving Formulas  Ultimate Bearing Resistance from Dynamic Load Tests  resistance. Instead a partial factor on the ultimate characteristic pile resistance, Rcc may be taken as  the   ts values given in the table above.  If pile formulae are used to assess the ultimate bearing resistance of individual compression piles in a  foundation, the validity of the formulae shall have been demonstrated by previous experimental evi- dence of good performance or static load tests on the same type of pile, of similar length and cross- section, and in similar ground conditions.  Pile driving formulae shall only be used if the stratification of the ground has been determined.  In the design, the number of piles to be redriven shall be specified. If redriving gives lower results,  these shall be used as basis for ultimate bearing resistance assessment. If redriving gives higher re- sults, these may be taken into consideration.  Redriving should usually be carried out in silty soils, unless local comparable experience has shown  this to be unnecessary.  When deriving the ultimate characteristic bearing resistance Rcc from values Rcmd measured in two  or several dynamic pile load tests, an allowance shall be made for the variability of the ground and the  variability of the effect of pile installations a minimum, both conditions (a) and (b) of the table below  shall be satisfied using the equation:  Dynamic load tests and their evaluation can be used to assess pile bearing resistance of individual  compression piles. The validity of the evaluation shall have been demonstrated by previous evidence  of acceptable performance or static load tests on the same pile type of similar length and cross-section  and in similar soil conditions. The input energy level during the dynamic load testing shall be high  enough to allow for an appropriate interpretation of the pile capacity at a correspondingly high enough  strain level.  • Rcc = Rcmd /  nd  Factors   nd to Derive Rcc  The design bearing resistance Rcd shall be derived from  In order to derive the ultimate design bearing resistance, the characteristic value Rcc should be divided  into components of base resistance Rcbc and shaft resistance Rcsc such that  where   bd and   sd are taken from the table below  Values of   bd,   sd and   td  Number of load tests  2  4  >4   nd on average Rcmd  1.5  1.35  1.3   nd on lowest Rcmd  1.5  1.25  1.1  Component factors  bd   sd   td  Driven piles  1.4  1.4  1.4  Bored piles  1.7  1.4  1.6  • Rcc= Rcbc + Rcsc  • Rcd = Rcbc/  bd + Rcsc/  sd  5_Vol3_d4.3_Section 5 Earth and pipe works_en_GIR_rev6.docx 