应土木工程与力学学院、西部灾害与环境力学教育部重点实验室、岩土质文物保护基础科学研究与人才培养甘肃省文物局重点科研基地（兰州大学）张景科教授邀请，加拿大阿尔伯塔大学Dave Chan教授，于2025年4月21-22日来我校学术交流并做学术报告，欢迎广大师生参加。
- 报告题目：The Characteristics of Granular Material in Motion
- 报 告 人：Dave Chan 教授
- 报告时间：2025年4月21日（星期一）16:30-18:00
- 报告地点：理工楼822会议室
- 主 持 人：张景科 教授
报告人简介
Dr. Dave Chan is currently a professor emeritus of the University of Alberta after serving the Department of Civil and Environmental Engineering for over 38 years. He as served as the executive member of the Geotechnical Society of Edmonton and Associate Editor of the Canadian Geotechnical Journal. He was the CGS Colloquium Lecturer in 2001. Under his supervision, he has supervised graduate students from countries around the world. Together with his students and collaborators, he has published many papers in geotechnical engineering, constitutive models for soils and numerical methods. His papers appear in the Canadian Geotechnical Journal, International Journal of Numerical and Analytical methods in Geomechanics, Granular Matter, etc. The research topics covers numerical methods, debris flow, landslides, constitutive models for soils, dams, dykes, excavations, oil sand, etc. He is the two times recipient of the R.M. Quigley Award in 1999 and 2001 and the recipient of the G. G. Meyerhof Award in 2023.
报告摘要
Debris flow consists of unsorted assembly of granular material of different particle sizes. Debris flow is a type of granular flow in which interparticle friction dominate the flow characteristics. There are several approaches in analyzing debris flow which can be broadly classified into continuum and discontiuum approaches. The behavior of granular material in motion is different than that under static condition. The effect of particle inertia plays an increasing important role when particle velocity is increased. To understand the behavior of granular flow, numerical experiments have been carried out to explore the frictional and volumetric behaviour of granular material. With increase in particle velocity, particle inertia results in an increase in resistance against motion and, at the same time, a decrease in interparticle contacts which results in less frictional contribution to the overall resistance. Volumetric deformation is important in granular deformation under static condition and it is equally important in granular flow. Physical experiment has been carried out on granular material in which vibration is applied after the material has been sheared statically. It is found that vibration results in volumetric compaction below the critical state volume which results in subsequent increase in shearing resistance of the material. In this seminar, the behavior of granular material under motion will be discussed and examined using numerical and physical experiments.