A study on adhesion of nodular pile and soil cement by pre-bored piling method

Abstract

Pre-bored piling method using nodular pile (precast concrete pile) consists of pitching the nodular pile into soil cement formed by mixing and agitating cement slurry and soil. Formulae for estimating vertical bearing capacity determined from the ground around the pile have been proposed based on the results of many loading tests. For vertical bearing capacity to develop, the soil cement has to transmit the load acting on the nodular pile to the ground. In this study, load test of nodular pile and soil cement in base bulb was carried out to clarify the adhesion effect. From the examinational results, the peak load of nodular pile was 4 times larger than the peak load of straight pile; it was found out that adhesion of nodular pile and soil cement is large effect. It was found out that the bearing pressure of nodular was 2 times larger than the unconfined compression strength of soil cement.