Modern pile driving and testing methods presently involved two fundamental theories, i.e. Impulse-Momentum Theory and Wave Mechanics Theory which have been popular and widely accepted since 1930s and 1960s. In 2000s, a new theory called Impact Load Theory, was proposed as an advancement of technology to both existing theories in modern pile driving and testing. This paper presents the compatibility study of the new theory to both existing theories. This new theory has led to the development of Y-Bearing Method in analytical and measurement models. Technically, analytical model of Y-Bearing is compatible to the well known Hiley Method (based on impulse-momentum theory). In addition, measurement model of YBearing is compatible to Case Method (based on wave mechanics theory). This new technology enables the engineers to implement Y-Bearing Method during the pre-piling stage using its analytical model to complement the results based on Hiley Method and subsequently apply its measurement model during piling stage to compliment the results based on Case Method.
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