IMHE OpenIR  > 山地灾害与地表过程重点实验室
AN INNOVATIVE METHOD FOR MEASURING THE DYNAMIC BASAL FRICTION
Language英语
Su, Zhiman1; Yang, Qingqing2; CAI FEI3; LI ZHIHAO2
Corresponding AuthorYang, Qingqing
2016
Source PublicationIV International Conference of Debris flows: Disasters, Risks, Forecast, Protection ; Proceeding of International Conference of Debris flows: Disasters, Risks, Forecast, Protection
Pages300-305
Conference Date6-10 September 2016
Conference PlaceIrkutsk – Arshan, Russia
Funding Organization2013CB733201 ; 41402244
Abstract

Recent studies have pointed out the importance of the basal friction on the dynamics of
rock avalanches, landslides, and debris flows, which consist in large-scale flows of grains in different sizes. In this paper, we proposed an innovative method to measure the dynamic basal friction coefficient of granular assembles, and also developed new relationships between the dynamic basal friction angle, the velocity, the displacement, and the time. A trajectory tracking system was designed to capture the timedisplacement
of granular assemblies during their sliding. The acceleration functions, which were used to calculate the dynamic friction angle, were then deduced based on the measured displacement. It is found that power law described well the time-displacement curve of the granular assemblies. Logarithm laws that related dynamic friction angle to displacement and time were both in a descending trend, which indicates the velocity-weakening feature of dynamic friction for granular assembles. A cyclical quick-slow
pattern in the increment of velocity is shown in the velocity-time curve. The duration of slow period was shorter. This cyclical pattern indicates that there existed intermittent fast-rearrangement which resulted in smaller dynamic friction and faster acceleration. The differences between static and dynamic friction angles were measured for different granular assembles, which were up to about 20 % at the early sliding highlighted
the difference between static and dynamic friction of granular assembles, and also revealed the sharp decrease of dynamic friction angle at the early sliding. The proposed method would contribute to develop space-time evolution of dynamic friction of granular assembles, and also provide a basis to understand the mechanism of long run-out geophysical flows.
 

KeywordGranular Assemblies Dynamic Basal Friction Static Basal Friction Inclined Plane Testing
Indexed By其他
Document Type会议论文
Identifierhttp://ir.imde.ac.cn/handle/131551/18137
Collection山地灾害与地表过程重点实验室
Affiliation1.Key Laboratory of Mountain Hazards and Surface Process, CAS & Institute of Mountain Hazards and
2.Southwest Jiaotong University
3.Department of civil and environment engineering, Gunma University, Japan
Recommended Citation
GB/T 7714
Su, Zhiman,Yang, Qingqing,CAI FEI,et al. AN INNOVATIVE METHOD FOR MEASURING THE DYNAMIC BASAL FRICTION[C],2016:300-305.
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