工程科学与技术2018，Vol.50Issue(1)：43-50,8.DOI:10.15961/j.jsuese.201700208
落石冲击破碎特征的加载率相关性研究
Loading Rate Dependency of Impact Induced Rock Fragmentation During Rockfall
摘要
Abstract
The rock block can be fragmented readily during rock-fall or rock-avalanche.This process produces many highly energetic and ran-domly sized rock fragments which can be very hazardous to human lives and lifeline facilities nearby.However,the upon impact of rock fragment-ation is usually not considered in the analysis of rockfall kinematics,because the trajectories and destructive power of rock fragments are very dif-ficult to predict.Therefore,the investigation of the rock fragmentation mechanism plays a critical role in the analysis of rockfall kinematics.In this paper,the discrete element method was applied to establish a numerical model of rock block impacting on a rigid ground.The spherical rock block was represented as an assembly of densely packed particles.The rigid ground was represented by a layer of fixed particles.The relationship between the impact loading rate and the fragmentation characteristic were analyzed.The results indicated that the instantaneous impact can lead to a lot of fractures generated in the rock block.The nucleation of these fractures breaks the rock block into fragments.As the impact loading rate in-creases,the fragmentation intensity and number of fragments increase,while the fragment size decreases.The number of fragments and the maxim-um fragment size both exhibit a power law dependence on the impact loading rate.The fragments size distribution could be well fitted by the three parameters generalized extreme value distribution function.关键词
落石/离散元法/加载率/破碎/尺寸分布Key words
rockfall/discrete element method/loading rate/fragmentation/size distribution分类
天文与地球科学引用本文复制引用
沈位刚,赵涛,唐川,戴峰..落石冲击破碎特征的加载率相关性研究[J].工程科学与技术,2018,50(1):43-50,8.基金项目
成都理工大学地质灾害防治与环境保护国家重点实验室开放基金资助项目(SKLGP2016K022) （SKLGP2016K022）
中央高校基本科研业务费专项资金资助项目(2017SCU04A09) （2017SCU04A09）
