ABSTRACT
A penetration experiment was conducted using a double-pipe model pile capable of measuring the inner friction resistance in isolation. The objective was accurately measuring the bearing capacity of open-ended piles and determining the range of machining that needs to be performed on the toe of the piles in order to plugging. The friction coefficient of the model pile was changed to verify the relationship between the inner friction resistance and the IFR*, and how plugging at the toe is affected by the range and position of the where machining area. From the results, it can be concluded that a superior outcome cannot be achieved solely by increasing the friction coefficient around 0.5D from the end of the pile. To achieve effective plugging, the friction coefficient should be increased not only at the toe of the pile but across an area of at least 1.0D from the toe of the pile.
