Japan Geoscience Union Meeting 2023

Presentation information

[E] Oral

H (Human Geosciences ) » H-DS Disaster geosciences

[H-DS05] Landslides and related phenomena

Fri. May 26, 2023 1:45 PM - 3:00 PM 106 (International Conference Hall, Makuhari Messe)

convener:Gonghui Wang(Disaster Prevention Research Institute, Kyoto University), Fumitoshi Imaizumi(Faculty of Agriculture, Shizuoka University), Hitoshi SAITO(Graduate School of Environmental Studies, Nagoya University), Masahiro Chigira(Fukada Geological Institute), Chairperson:William Schulz(United States Geological Survey)

2:30 PM - 2:45 PM

[HDS05-14] Accelerating Creep of Landslide Movement and the Rate- and State-dependent Frictional Behavior in It

*Chengrui Chang1, Hiroyuki Noda2, Gonghui Wang2, Tetsuo Yamaguchi1 (1.the University of Tokyo, Graduate School of Agricultural and Life Sciences, 2.Kyoto University, Disaster Prevention Research Institute)

Keywords:Creep, Rate- and state-dependent friction, Acceleration, The Voight model, Parameter

Landslides show a diverse range of slip behaviors that are similar to tectonic faults. Slow-moving landslides might sometimes accelerate to catastrophic failure. The key motivation of this study is to better characterize the slow-to-fast transition of sheared soil materials as responses to frictional properties. We begin with the lab ring-shear test to simulate accelerating creep behavior in the material and examine its rate- and state-dependent behavior by velocity-step test. We then constrain the accelerating creep by using the Voight model that describes the universal proportionality between velocity and acceleration in the log-log plot for the terminal stage of material failure or natural disasters (Voight, 1988, 1989), especially for landslides. And we obtain frictional parameters by constraining the frictional response of the material in velocity-step tests. It should be emphasized that we focus on the variations of the power exponent α in the Voight model. Finally, we combine the accelerating creep, rate- and state-dependent friction, and theoretical analysis to approach the key issue of the physical base for the Voight model. This study might be useful for studies in landslide mechanics and fault mechanics.

Reference
Voight, B. (1988). A method for prediction of volcanic eruptions. Nature, 332(6160), 125–130.
Voight, B. (1989). A Relation to Describe Rate-Dependent Material Failure. Science, 243(4888), 200–203.