Effective Stress Analysis for Landslide on Gentle Slopes

Tetsuo Tobita ； Kei Kashiwagi ； Masahiro Chigira ； Susumu Iai

《Geotechnical Hazard Mitigations: Experiment, Theory and Practice—Proceedings of the 5th International Conference on Geotechnical Engineering for Disaster Mitigation and Rehabilitation》 2017年 (2017/10) Pp. 99-110

https://doi.org/10.6140/9789864371419.201710.0009

摘要

Earthquake-induced landslides of collapsible soils, such as volcanic cohesive soil, have caused tremendous damage to human society. They are highly mobile and their runout distance is long. What is worse, since they typically occur on gentle slopes which is not designated as a steep slope area in danger of failure, it is incomprehensible even to residents nearby. Characteristics of such a landslide have been studied by many researchers. However, failure mechanism, especially under dynamic condition, is yet unknown. Based on the field investigation and laboratory test results, the slope of Hanokidaira in Fukushima Pref., Japan, where this type of landslide occurred in the 2011 Tohoku Earthquake, is modeled as one-dimensional FEM model to elucidate the failure mechanism and improve quality of landslide hazard warning by combining the numerical analysis with conventional method.

關鍵字

Landslides ； Effective stress analysis ； Hazard mapping ； Dynamic ； Numerical analysis