PERFORMANCE VERIFICATION IN ACTUAL SIZE ABOUT THE PILE WHICH HAS SOIL CEMENT BLOCK ON THE TIP DRIVEN BY VIBRATORY PILE DRIVING WITH WATER JETTING

Abstract

 Recently, there is a tendency that piles diameters of the foundation for the port structure is getting larger, because the scale of the port structures is bigger, the water depth of quays is deeper, and the structure system is getting rationalized. On the other hand, the large diameter pile which is driven by the traditional impact hammer or vibratory pile driving with cement milk jetting is difficult to perform high bearing capacity. In addition, the vibratory pile driving with water jetting and constructed soil cement block on the pile tip , which the authors have confirmed the performance in smaller than 1000 mm diameter, has not been confirmed that it is possible to construct the soil cement plug for the large diameter pipe piles. In this situation, the authors have studied the constructing process of soil cement block by water and cement milk jetting, and developed the more suitable method for large diameter pipe piles. In this paper, the validation test for the piles driven by this method is shown. Its test is consisted of boring, unconfined test and X-ray computed tomography test for the soil cement block. As a result, it is confirmed that this method is effective for the large diameter pipe piles.