One of the methods has been used to identify the behavior of pile foundation while receiving axial load is t-z method. By using T-z method, the behavior of pile foundation while transferring the axial load (load transfer, t) and settlement (z) which is called load-settlement curve could be quantified. In this research, driven pile is used with the soil is predominantly clay. TZPILE is employed to generate load-settlement curve. That load-settlement curve which were generated by TZPILE is then compared with that of Static Loading Test (SLT). According to that comparison, a load-settlement curve has been predicted (predicted SLT) if downdrag condition is applied. On the other hand, the methods of Davisson (1972), Van Der Veen (1953), andMazurkiewicz (1972 are utilized to calculate ultimate bearing capacity (Qult) and allowable bearing capacity (Qall) by interpreting the data of SLT and predicted SLT. Thereafter,evaluation of working load has been carried out by considering the settlement of load-settlement curve. The results of TZPILE show that the load-settlement curve is well predicted so then it can be adopted to predict load-settlement curve of SLT in downdragcondition. Three methods of interpreting of SLT and predicted SLT show that Qall are greater than working load, otherwise predicted SLT. Evaluations of Qall by considering the settlement show that Qall is greater than the results of Davisson (1972), Van Der Veen (1953), and Mazurkiewicz (1972). Surprisingly, all the results show that Qall is greater than working load.
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