Abstract

The Mid-Niigata earthquake occurred in 2004 and taught us a lesson about the possibility of landslide damming when the earthquake occurs after the softening of the ground by rainfall. Terano Landslide was considered stable before the earthquake. However, due to the earthquake, the landslide moved extensively and dammed the Imokawa River. A main landslide block was analyzed for a seismic loading condition using the observed peak ground acceleration. Soil samples were collected from numerous sliding surfaces, and fully softened and residual shear strengths were measured. Factor of safeties were calculated for the mobilization of fully softened and residual shear strengths during different peak ground accelerations (PGA) and different pore water pressure ratios. Quantitative risk to landslide damming was evaluated for different PGA and ground water level scenarios, using the Bishop's Simplified Stability Analysis Method modified for the dynamic loading. The study results showed that the landslide mass would fail even if the earthquake of PGA more than 0.4g occurred in a dry season.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.