May 2, 2019

Amir Ahmadipur Coauthored a Paper on Basal Friction Effects on Landslides Published in the Journal of the International Consortium on Landslides

Amir Ahmadipur, Ph.D. (Texas) coauthored a paper entitled "Investigation of basal friction effects on impact force from a granular sliding mass to a rigid obstruction" that was published in Landslides: Journal of the International Consortium on Landslides on pages 1-17 on March 22, 2019.

Amir was the lead author, and his coauthors were Tong Qiu and Bahman Sheikh.     

Amir is a Senior Staff Professional based in Texas focused on geotechnical instrumentation and data management, slope stability, rapid granular flows, landslides, foundation engineering, geothermal pile foundations, and soil behavior.

The journal Landslides is the common platform for publication of integrated research on all aspects of landslides. The journal publishes research papers, news of recent landslide events and information on the activities of the International Consortium on Landslides. Coverage includes landslide dynamics, mechanisms and processes; volcanic, urban, marine and reservoir landslides; related tsunamis and seiches; hazard assessment and mapping; modeling, monitoring, GIS techniques; remedial or preventive measures; early warning and evacuation and a global landslide database. Landslides has been accepted at Thompson ISI for coverage in Science Citation Index Expanded, Current Contents/Physical Chemical and Earth Sciences and Current Contents/Engineering Computing and Technology.


Understanding the behavior of rapid granular flow and quantifying the impact force from a granular sliding mass on a rigid obstruction provide useful information for risk assessment and engineering design against rapid flow-like landslides. Basal friction affects the governing mechanisms of rapid granular flow and consequently influences the impact force. This paper presents an experimental and analytical investigation on the effects of basal friction on flow front velocity and impact force from a granular sliding mass to a rigid obstruction. For the experimental investigation, the results of a series of 2-D flume tests with two different basal friction conditions at different inclination angles, sliding distances, and initial relative densities are presented and discussed. It is observed that increasing the basal friction angle induces more shearing within the sand mass and results in a more dominant spreading mechanism, a shallower flow profile, a lower flow front velocity, and a smaller dynamic impact force. For the analytical investigation, the static and dynamic force components are investigated individually and a method for calculating these forces is presented. In this approach, the static force is calculated using the limit equilibrium method and the dynamic force is calculated by considering the reflection of compression shock waves due to impact. This approach allows the material stiffness to be taken into account in the dynamic force calculation. Adding the static and dynamic force components, the instant value of the total impact force can be calculated, and an excellent agreement is observed between the calculated and measured impact forces.

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