EFFECT OF THE RELATIVE DENSITY TO THE MECHANISM OF THE END BEARING CAPACITY DEVELOPMENT OF THE OPEN ENDED PILES

Abstract

 Deep embedded and large diameter steel pipe piles have been popularly used in the port facilities nowadays, because of growing size of port facility or changing structural types. Estimation of bearing capacity of large diameter and deep embedded piles is complex problems because of bearing capacity increment by deep embedment and decrement by decrement of plugging effect with using large diameter piles. In this report, pile plugging mechanism was investigated under the sandy ground of different relative density. Open ended model pile penetration experiments were conducted and plugging ratios and incremental filling ratios of each experiment was compared. Finally, coefficient of earth pressure inside of the pile was estimated. Then inner friction force distribution was estimated. As a result, inner friction around the toe of the pile is large and it rapidly decreases along with upward of the pile. And there are very little difference of coefficient of lateral earth pressure observed under different relative densities.