| AN INNOVATIVE METHOD FOR MEASURING THE DYNAMIC BASAL FRICTION |
| Su, Zhiman1; Yang, Qingqing2; CAI FEI3; LI ZHIHAO2
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| 2016
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会议名称 | IV International Conference of Debris flows: Disasters, Risks, Forecast, Protection
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会议日期 | 6-10 September 2016
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会议地点 | Irkutsk – Arshan, Russia
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关键词 | granular assemblies
dynamic basal friction
static basal friction
inclined plane testing
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页码 | 300-305
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通讯作者 | Yang, Qingqing
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英文摘要 |
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.
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收录类别 | 其他
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会议主办者 | 2013CB733201
; 41402244
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会议录 | Proceeding of International Conference of Debris flows: Disasters, Risks, Forecast, Protection
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语种 | 英语
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内容类型 | 会议论文
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源URL | [http://ir.imde.ac.cn/handle/131551/18137] |
专题 | 成都山地灾害与环境研究所_山地灾害与地表过程重点实验室
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作者单位 | 1.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
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推荐引用方式 GB/T 7714 |
Su, Zhiman,Yang, Qingqing,CAI FEI,et al. AN INNOVATIVE METHOD FOR MEASURING THE DYNAMIC BASAL FRICTION[C]. 见:IV International Conference of Debris flows: Disasters, Risks, Forecast, Protection. Irkutsk – Arshan, Russia. 6-10 September 2016.
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