Vertical Capacity of Large and Deep Barrette Pile for Bangkok Subsoils

Abstract

Recently, barrette piles have been used to replace conventional bored piles in order to increase allowable vertical pile capacity in the limited space projects such as high-rise building projects and elevated train projects. The basic of construction equipment, the slurry used during construction and construction time between barrette pile and bored pile construction are totally different. Therefore, their design parameters for pile capacity estimation should be different. In this research, pile load test was carried out on the fully-instrumented barrette piles. The test result can be separated into friction of each soil layer and end bearing. By considering stress-strain relationships, adhesion factor of clay layer, friction factor of sand layer and end bearing factor of sand layer can be calculated. These factors were found to be able to estimate ultimate pile capacity. Based on these factors, the estimated pile capacity was compared with another barrette pile tests. This estimation agreed well with the test results.