The Enhancement of Pile Capacity by Shaft Grouting Technique in the Ruspa Bridge Project in Bangladesh

Abstract

This paper makes the presentation of the author’s experience of the pile construction for the Rupsa Bridge Construction Project in Bangladesh. The initial pile loading tests for cast-in-situ pile of diameter 2500mm and 75m long constructed in Rupsa River, one of the branch River of Ganges River, resulted in failure at the early stage of the loading test due to the dispersive behavior of the soil which likely have reduced the skin friction and end bearing capacity. In order to enhance the pile capacity, base grouting and shaft grouting technique was adopted. The result of application of this technique has achieved the pile capacity as high as 5 to 7 times that of plain piles which is far more than the previously reported 1.5 to 3 times in the other projects using the same shaft grouting technique. The paper describes the detailed know-how of the technique.