Correlation of Clay-Bearing Capacity from Drop Hammer Test and Loading Test on Small Diameter Piles

Abstract

The provision of foundation piles in small diameters to support load capacity is fundamental in enhancing the stability and safety of shallow foundations, retaining walls, and other medium-load structures. The ultimate load (Q_ult) of piles from soil investigations and CPT testing can be easily analyzed, but the facilities needed to determine this process in the form of test equipment are costly and time-consuming. This process makes it difficult to empirically calculate the ultimate load capacity on installing small diameter piles in the form of Cerucuk wooden piles. Therefore, this research aims to determine the correlation of clay-bearing capacity from drop hammers and loading tests on small diameter piles. This is based on the relationship between static and drop hammer test values on piles with varying diameter, depth, and curing time after piling. The method used in the drop hammer test is an analysis of the EN formula, technically and the calculation is a bit far from the analysis results from other in situ test results, but the use of simple tools in determining the ultimate load makes its reason to use it by correlating the Ultimate Load results from the loading test based on the Davison method. The analysis of the De Beer and Chin method is also shown to see significant results. As a benchmark in testing the Loading test on the pile, the soil investigations results, from analysis of the Meyerhof method and CPT calculations. As a result of the analysis of the relationship between the calculation of permitted bearing capacity pile from the drop hammer test and the loading test, it is displayed in a curve approaching an exponential equation <img src=image/14828384_01.gif> for 3 days of curing time after piling and <img src=image/14828384_02.gif> 30 days of curing time after piling. This research can be used as a reference for planners in determining the bearing capacity of foundation piles on soft soil for medium load structures.