Forensic Investigation of A Subway Tunnel Construction Failure

Abstract

In this paper, the forensic evidences and investigation of a subway tunnel construction failure occurred in Kaohsiung, Taiwan are presented. The studied construction failure occurred during a cross passage excavation of a shield tunnel construction work of the Kaohsiung Mass Rapid Transit System, and resulted in severe tunnel collapse and extensive ground failure that even reached to ground surface 30m above the tunnel depth. Valuable photo images obtained during and post event, as well as results of special geophysical testing methods were presented and compared to verify proposed failure scenario. Information presented in this paper is hoped to be helpful to improve engineers’ knowledge for preventing similar construction risks.