IMHE OpenIR  > 山地灾害与地表过程重点实验室
Alternative TitleStudy on Equivalent Impact Force and Impact Distribution Range of Landslide Debris Flow with Different Gradation
李天话1; 樊晓一1,2; 姜元俊3
Source Publication山地学报
Contribution Rank3
Other AbstractThe impact of landslide debris flow is a continuous and complicated mechanical process caused by a large number of debris particles with uneven size gravels and coarse boulders. In the process of movement and impact,the sliding bodies with different particle sizes and compositions occur internal collision,friction,jumping and so on,resulting in a certain regular change in the magnitude and distribution of impact force of landslide debris flow. Therefore,this research has important scientific significance to make up for the deficiencies in the research of landslide debris flow impact structure and to improve the design of impact-resistant structures. Based on the data of indoor physical model tests,the equivalent impact forces and the equivalent impact positions of landslide debris flow were proposed in terms of a three-dimensional discrete element method,and then it discussed the distribution characteristics of impact forces of landslide debris flow under different grading conditions. The results showed that the processes of sliding impacts on retaining wall could be divided into dynamic impact stage and quasi-static accumulation stage. During the dynamic impact process,the friction energy consumption of the fine particle components of a sliding body was significant,resulting in the reduction of impact forces and their acting height. The collisions between coarse particles with a particle size of 20 mm or more promoted the energy transfer inside the sliding body,resulting in the increase of impact force and acting height of a sliding body. The peak impact force was distributed dispersedly,and the concentration trend of the peak impact force along the vertical height direction was not significant. In the quasi-static stacking stage,the contact forces on the retaining wall were mainly the collision transfer of the impact energy of the subsequent sliding particles and the accumulation of gravity components. Under the condition that the topographical conditions on both sides of sliding zones were basically the same,the horizontal distributions of equivalent impact force of sliding body were mainly concentrated near the central axis of the inflow surface and was less affected by particle gradation.
Keyword滑坡碎屑流 离散元素法 颗粒级配 冲击力分布
Indexed ByCSCD
Citation statistics
Cited Times:3[CSCD]   [CSCD Record]
Document Type期刊论文
Corresponding Author樊晓一
Recommended Citation
GB/T 7714
李天话,樊晓一,姜元俊. 不同颗粒级配滑坡碎屑流等效冲击力及作用位置分布研究[J]. 山地学报,2018,36(5):740-749.
APA 李天话,樊晓一,&姜元俊.(2018).不同颗粒级配滑坡碎屑流等效冲击力及作用位置分布研究.山地学报,36(5),740-749.
MLA 李天话,et al."不同颗粒级配滑坡碎屑流等效冲击力及作用位置分布研究".山地学报 36.5(2018):740-749.
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