文献类型：期刊文献

中文题名：再探运动特征及落石特征对切向恢复系数的影响

英文题名：Reinvestigating the effects of kinematic characteristics and rockfall characteristics on the tangential restitution coefficient

作者：姬中民[1,2];王庭辉[1];伍劼[3];伍法权[2];李振华[4];管圣功[2];沙鹏[2]

机构：[1]河南理工大学土木工程学院,河南焦作454003;[2]绍兴文理学院土木工程学院,浙江绍兴312000;[3]浙江岩创科技有限公司,浙江绍兴312000;[4]河南理工大学能源科学与工程学院,河南焦作454003

年份：2024

卷号：98

期号：11

起止页码：3441

中文期刊名：地质学报

外文期刊名：Acta Geologica Sinica

收录：北大核心2023、CSTPCD、、EI(收录号：20244917488332)、Scopus、CSCD2023_2024、北大核心、CSCD

基金：国家自然科学基金地质联合基金项目(编号U2244228);国家自然科学基金项目(42307250);中国博士后科学基金项目(编号2022M721033);地质灾害防治与地质环境保护国家重点实验室开放基金项目(编号SKLGP2023K007)联合资助的成果。

语种：中文

中文关键词：落石特征;运动特征;显著关联控因;切向恢复系数;影响机理

外文关键词：rockfall characteristics;kinematic characteristics;significant correlated controlling factors;tangential restitution coefficient;influence mechanism

中文摘要：切向恢复系数(R_t)是预测落石冲击运动过程的关键参数,其取值准确与否直接决定落石轨迹预测精度,继而影响所布设防护结构的防护效果。由于对落石冲击运动机制认识尚不够深入,一直以来R_t常被认为与坡面特征密切相关,对于运动特征及落石特征这两个关键参与角色却鲜有关注。本文结合冲击动力学理论及前人研究结论,确定了运动特征及落石特征中所涉及的R_t显著关联控因,并基于此,采用专门研发的多功能落石冲击测试装置分别开展了运动特征和落石特征中各控因对R_t影响的系统研究。结果表明,低入射速度(V)范围内,V与R_t正相关,V足够高时,影响不显著,基于松散介质坡,两者又表现为负相关;竖直入射斜面和斜入射水平面条件下,R_t随碰撞角增大分别呈下降和上升趋势;R_t对转速变化不敏感,探究两者关系需联合考虑冲击姿态及试块形状;致密岩质和松散介质坡面条件下,试块尺寸对R_t表现出两种相反影响趋势;较大R_t值常在几何不对称度较高试块碰撞测试中获得,且棱角状试块R_t值总体高于非棱角试块;较低或较高冲击动能条件下,R_t随试块硬度增大分别呈上升或下降趋势。这些发现不仅可为落石空间径迹的精准预测以及相关防护设施的设计、布设提供重要参考,同时也为后续更全面深入探究落石碰撞运动过程拓宽了视野。

外文摘要：The tangential restitution coefficient(Rt)is a critical parameter in predicting the movement process of rockfall impacts.Its accuracy directly determines the precision of rockfall trajectory predictions and consequently affects the effectiveness of preventive structures installed.Traditionally,due to a lack of deep understanding of the rockfall impact motion mechanism,Rt has been considered closely associated with slope characteristics.However,the influence of rockfall and kinematic characteristics has received less attention.Although some preliminary explorations have been made,no consensus has been achieved on the influence of certain controlling factors.This paper leverages theories of impact dynamics and findings from previous research to identify significant control factors related to Rt,encompassing both kinematic and rockfall characteristics.Based on this,systematic studies were conducted using a specially developed multifunctional rockfall impact test apparatus to analyze the influence of these control factors on Rt.The findings reveal several key relationships:At low incident velocities(V),a positive correlation exists between V and Rt.However,at high V,this impact becomes less significant,and a negative correlation is observed on slopes of loose medium.For vertical impacts on inclined planes,Rt generally decreases with increasing impact angle,while for oblique impacts on horizontal surfaces,Rt increases with a larger impact angle.Rt is insensitive to changes in rotational speed,though a comprehensive understanding of this relationship requires considering both impact posture and specimen shape.On both dense rock and loose medium slopes,block size shows contrasting relationships with Rt.Larger Rt values were typically obtained in the impact tests of blocks with higher geometrical asymmetry,with angular blocks having generally higher Rt values than non-angular ones.Under conditions of lower or higher impact energies,Rt showed an increasing or decreasing trend,respectively,with the increasing block hardness.These discoveries not only provide critical references for precise rockfall trajectory prediction and the design and deployment of effective preventive measures but also widen the perspective for more comprehensive and indepth research on the impact-motion process of rockfalls in subsequent studies.