Abstract：The load transfer mechanism of Y-shaped vibro-pile in construction and preloading periods of embankment is adequately studied by reinforcement metre. The buried and connected modes of reinforcement metre are introduced in detail. The stress of reinforcement metre during courses of concrete freezing and hardening is studied. The recalibration of reinforcement metre is needed when dealing with test data；and the calibration method is introduced in detail. The test data show that the axial force of pile at any position all increase under embankment load，but the increasing amplitudes are different. The position of the maximum axial force of pile hardly changes. The process of pile-soil load transfer is still not over when the embankment has been preloaded. But the variable amplitude decreases gradually. The negative friction exists in the distance 3.0 to 6.0 m from pile tip. The friction increases with the increase of embankment load. The negative friction exists all the time in testing period；and the position of the maximum negative friction point and neutral point of pile hardly change with the increase of embankment load.
