Study on the influence of topography conditions on the dynamic characteristics of dry granular flow

被引：0
|
作者：
Hu X. [1 ,2 ]
Fan X. [3 ,4 ]
Jiang Y. [2 ]
机构：
[1] School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang
[2] Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu
[3] School of Civil Engineering and Geomatics, Southwest Petroleum University, Chengdu
[4] Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Southwest University of Science and Technology, Mianyang
来源：
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2020年 / 39卷
基金：
中国国家自然科学基金;
关键词：
Discrete element modeling; Energy evolution; Granular flows; Impact force; Slope engineering; Topography conditions;
D O I：
10.13722/j.cnki.jrme.2019.0490
中图分类号：
学科分类号：
摘要：
The moving distance of the dry granular flow and its impact force on concrete structures are important indices to evaluate the disaster risk. The prime factor which plays an influential role in moving distance and impact force of dry granular flow is the topographic conditions. Based on the three topographic conditions(the concave topography, the slope-toe topography, and the tiered topography) of dry granular flow for a village in mountainous terrain, this paper analyzes the influence of topographic conditions on dry granular flow, accumulation distance and impact on structures, from the energy evolution point of view. The results indicate that, for concave topographic conditions, the kinetic energy conversion of the dry granular flow is higher with longer distance, the extent of damages is high and the impact force on the retaining wall at the toe of the slope is smaller. While for the slope-toe topography, the kinetic energy conversion rate of the dry granular flow is lower, the flow distance is shorter, the extent of damages is smaller and the impact force on retaining wall at the toe of the slope is higher. Under the same initialization mechanism of dry granular flow, the peak impact force for the tiered topography decreases faster than the concave topography, with the increase of distance between retaining wall and the toe of the slope. The results of this research can be a potential reference for the assessment of disaster risk mitigation and design of retaining structures for landslides or collapse granular flows. © 2020, Science Press. All right reserved.
引用
收藏
页码：2940 / 2953
页数：13
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