عنوان مقاله [English]
Over time, types of piles and pile installation methods have been considerably developed, and, therefore, engineers have various choices in this regard. So far, some research has been done to analyze and design cast-in-place concrete piles in sandy soil. The methods used to evaluate pile behavior are reliable only when the appropriate results have been observed in the field of numerous data. There are many ways to determine pile bearing capacity, and statistical analysis based on soil strength, the empirical method with in-situ tests results, and pile load tests are some of them. Pile load testing is an exact method to determine pile bearing capacity and is usually used in important projects. Therefore, in the present study, 12 cast-in-place concrete piles with different sizes were loaded in sand and the settlements were measured, in order to determine the ultimate bearing capacity of the piles. Piles were constructed
in lab scale and were divided into 4 classes. In this article, first, some past research is reviewed. Then, soil properties and tests used for field investigation are provided. Pile installation methods and equipment used for pile testing in this study are explained. Finally, the bearing capacity of the piles is evaluated. Estimation of pile capacity based on a load-settlement curve is often difficult. There are many ways to explain test results and estimation of the bearing capacity of the piles. Then, in this study using load-settlement diagrams, the ultimate bearing capacity of the piles was estimated by existing empirical methods and the results were compared with each either. The results show that the bearing capacity in Chins method is considerably higher than the average value obtained from other methods. On the other hand, Davissons method shows a lower value, and Terzaghis method is more reliable in this study. Finally, using the pile load test, reliable results for the piles are obtained.