Conditioning Inspection on Unknown Bridge Foundations

摘要

Non-destructive testing (NDT) inspection has been verified to efficiently know the current conditioning of bridge foundations. In this paper, NDT techniques were required to inspect the unknown foundations on a damaged heritage railroad bridge for further rehabilitation inTaiwan. Three proposed NDT methods, electrical resistivity tomography, ultra-seismic method, and parallel seismic method, were conducted to identify the bridge foundation depths. Post proof excavation and boring exploration were provided to verify the reliability of these inspection results. The electrical resistivity tomography inspection reasonably identifies the upper portion of soil layers and depth of granite lining layer of the foundations. Being compared with site subsurface results, the ultra-seismic and parallel seismic methods present a precise ability to determine the bridge foundation depths.