Attempts were made in this study to establish mechanism about ground vibration isolation through experiments using model barriers. Effects were identified of the diameter of the hollows, as well as the distance between two solid parts of such barriers on their performances. Their effectiveness was found to rapidly improve with an increase in the hollow diameter. Two non-dimensional parameters were identified to provide variables governing the performance of a barrier composed of hollow PCwall piles. Barriers built with hollow PCwall piles have been proposed to isolate ground vibration in its path of propagation, their effectiveness have been recognised through a number of past studies. The mechanism through which these barriers isolate ground vibration, however, has not been fully understood yet because of certain limitations imposed on field studies. Attempts were made in this study to establish such mechanism through experiments using model barriers. Experimental studies were conducted on model barriers to determine the performances of vibration barriers composed of hollow PCwall piles. Effects were identified of the diameter of the hollows, as well as the distance between two solid parts of such barriers on their performances. Their effectiveness was found to rapidly improve with an increase in the hollow diameter. Two non-dimensional parameters were identified to provide variables governing the performance of a barrier composed of hollow PCwall piles.
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