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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
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
2018
Source Publication山地学报
ISSN1008-2786
Volume36Issue:5Pages:740-749
SubtypeArticle
Contribution Rank3
Abstract滑坡碎屑流的冲击是一个持续的,由大量粗细不均匀的碎屑岩粒及粗大块石共同作用的复杂力学冲击过程,冲击压力的大小和分布范围呈现一定的规律变化。以室内物理模型试验的数据为依据,运用三维离散元素法,提出滑体等效冲击力和等效冲击作用位置,探讨不同级配条件下,滑坡碎屑流冲击力的分布特征。结果表明,滑体冲击挡墙的过程可划分为动态冲击阶段和准静态堆积阶段。动态冲击过程中,滑体细颗粒组分摩擦耗能显著,导致滑体冲击力及其作用高度减小;粒径为20mm及以上粗颗粒间的碰撞作用促进了滑体内部的能量传递,导致滑体冲击力及作用高度增加,峰值冲击力呈分散性分布,峰值冲击力沿竖直高度方向的集中趋势不显著。准静态堆积阶段,挡墙所受接触力主要为后续滑体颗粒冲击能量的碰撞传递及重力分量的累积。滑坡碎屑流滑动带两侧场地条件基本相同的情况下,滑体等效冲击力的水平分布位置主要集中于迎流面中轴线附近,受颗粒级配条件影响较小。
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
DOI10.16089/j.cnki.1008-2786.000370
Indexed ByCSCD
Language中文
CSCD IDCSCD:6362340
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/25274
Collection山地灾害与地表过程重点实验室
Corresponding Author樊晓一
Affiliation1.西南科技大学土木工程与建筑学院,四川绵阳621010;
2.工程材料与结构冲击振动四川省重点实验室,四川绵阳621000;
3.中国科学院、水利部成都山地灾害与环境研究所,成都610041
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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