41 of 49 Construction of Giresun Wastewater Treatment Plant  Tender Dossier Volume 3 Employer’s Requirements  Section 05: Earth Works, Pipe Works and Ground Improvement  5.4.6.14 Pile load tests  General  Pile load tests shall be carried out in the following situations:   When using a type of pile or installation method that is outside comparable experience and  which has not been tested under comparable soil and loading conditions   When using a piling system which is outside the experience of the operatives carrying out the  work   When the piles will be subject to loading for which theory and experience do not provide suf- ficient confidence in the design. The pile testing procedure should then provide loading simi- lar to the anticipated loading   When observations during the process of installation indicate pile behaviour that deviates  strongly and unfavourably from the behaviour anticipated on the basis of the site investigation  or experience when additional ground investigations do not clarify the reasons for this devia- tion  Load test can be statically or dynamical.  If a load test is carried out, it shall normally be located where the most adverse ground conditions are  believed to occur. If this is not possible, an allowance shall be made when deriving the characteristic  value of the bearing resistance.  If load tests are carried out on two or more test piles, the test location shall be representative of the site  of the pile foundations, and one of the test piles shall be located where the most adverse ground condi- tions are believed to occur.  Between the installation of the test pile and the beginning of the load test, adequate time shall be al- lowed to ensure that the required strength of the pile material is achieved and the pore pressures have  regained their initial values.  Static Load Tests  a) Loading Procedure  The pile load test procedure, particularly with respect to the number of loading steps, the duration of  the loading steps and the application of load cycles, shall be such that conclusions can be drawn about  the deformation behaviour, creep and rebound of a pile foundation from the measurements on the pile.  For trial piles, the ultimate loading shall be such that conclusions can also be drawn about the ultimate  failure load.  Static load tests shall be carried out in accordance with the ISSMFE Subcommittee on Field and La- boratory Testing recommended procedure, ”Axial Pile Loading Test, Suggested Method”, published in  the ASTM Geotechnical Testing Journal, June 1985, pp 79-90.  In case of different wording the text in these Employer’s Requirements shall be valid prior to the  above mentioned recommended procedure.  Devices for the determination of forces, stresses or strains and displacements shall be calibrated prior  to the test.  In general, pile load tests for the purpose of designing a tensile pile foundation should be carried out to  failure. Extrapolation of the load-displacement graph for tension tests should normally not be used,  especially in the case of transient loading.  5_Vol3_d4.3_Section 5 Earth and pipe works_en_GIR_rev6.docx 