Abstract
In this paper, the results of static horizontal loading tests of steel tubular piles installed by the Gyropress Method and the Press-in Method assisted with water jetting were collected, and the se horizontal bearing performance s were evaluated. As a result, the following were drawn: 1) Load-displacement curves of the Press-in Method assisted with water jetting and the Gyropress Method were consistent with the Weibull distribution curve, when the deformation index m=1.0. The average yield displacement normalized by the pile diameter with the Gyro Method is consistent with the average values of 4.1 – 4.5 % for steel tubular piles installed by other construction methods, and that with the WJ Method gives smaller value than the average of other construction methods; 2) The coefficient of horizontal subgrade reaction calculated backward from the displacement at the loading point showed somewhat larger value than the design value when the reference displacement was set at 1 % of the pile diameter in the case of the Gyro method. On the other hand, for cases constructed by the WJ method, the average of measured kH is regarded fairly consistent with designed kH, but the variation of them are large; and 3) In the case of group piles, δg - kH curves were better fitted than δg / B - kH curves. The calculated backward kH approximately coincides with the design kH when the horizontal displacement at the ground surface is about 15mm.
