[1]柳万里,晏鄂川*,魏鹏飞,等.落石运动特征试验及影响因素敏感性分析[J].山地学报,2021,(1):47-58.[doi:10.16089/j.cnki.1008-2786.000575]
　LIU Wanli,YAN Echuan*,WEI Pengfei,et al.Experimental Study on Rockfall and Sensitivity Analysis of Influencing Factors[J].Mountain Research,2021,(1):47-58.[doi:10.16089/j.cnki.1008-2786.000575]
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落石运动特征试验及影响因素敏感性分析()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2021年第1期
页码:
47-58
栏目:
山地灾害
出版日期:
2021-01-25

文章信息/Info

Title:
Experimental Study on Rockfall and Sensitivity Analysis of Influencing Factors
文章编号:
1008-2786-(2021)1-047-12
作者:
柳万里1; 晏鄂川1*; 魏鹏飞2; 李丽华2
1.中国地质大学(武汉)工程学院,武汉430074; 2. 湖北省地质局第八地质大队,湖北 襄阳441000
Author(s):
LIU Wanli1; YAN Echuan1*; WEI Pengfei2; LI Lihua2
1. Faculty of Engineering,China University of Geosciences, Wuhan 430074, China; 2. Eighth Geological Brigade of Hubei, Xiangyang 441000,Hubei,China
关键词:
落石;  运动特征;  Rockfall软件;  因素敏感性;  汤池峡
Keywords:
rockfall;  motion characteristic;  Rockfall software;  factor sensitivity;  Tangchi Gorge
分类号:
P642.2
DOI:
10.16089/j.cnki.1008-2786.000575
文献标志码:
A
摘要:
危岩崩落时会与坡面碰撞解体为块径不同的落石,而落石运动特征影响因素众多,导致难以准确预测落石运动全过程。本文以湖北汤池峡崩塌为例,在调查分析崩塌区地质条件的基础上,开展现场危岩清除试验,通过拍摄危岩崩落过程获取落石运动数据,并采用Rockfall软件对比研究落石运动特征,结果表明,当法向恢复系数Rn=0.37、切向恢复系数Rt=0.87、粗糙度f =6°、摩擦角α=30°时,模拟结果与现场试验吻合较好,该参数组合可准确表征落石运动过程。基于Rockfall软件的影响因素敏感性分析发现,不同因素对落石运动特征的影响程度和作用机制存在差异,尤以α对落石运动的影响机制最为复杂。当选取因素单位变化率为敏感性排序依据时,对于落石运动距离、弹跳高度和总动能而言,Rn、Rt、f、α、m(落石质量)、H(初始高程)等因素的敏感性排序分别为:Rt>Rn>f >H>m、H>Rt>Rn>f、m>Rn>H>Rt>f。本文相关成果可指导落石影响范围与危害程度判定,并为崩塌防治设计提供参考依据。
Abstract:
In the process of rockfall, it often collides with the cliff surface and disintegrates into falling rocks with different block diameters. There are many factors affecting the characteristics of rock movement, which makes it difficult to accurately predict the whole process of rockfall movement. In this paper, taking collapse in Tangchi Gorge of Hubei Province as example, based on the investigation and analysis of the geological conditions in the area, it carried out a unstable rock removal test in the field, and tracked the process of the collapse and monitored the data of the falling rocks movement. Subsequently, the results of a comparative study on the characteristics of falling rocks carried out by Rockfall software showed that when the normal restitution coefficient Rn=0.37, the tangential restitution coefficient Rt=0.87, the roughness f=6 °, the friction angle α=30 °, the test data were in good agreement with the simulation results. That is, the parameter combination can accurately characterize the process of falling rock movement. Based on the sensitivity analysis of Rockfall software, it was found that, different factors had different degrees of influence on the characteristics of rockfall and the mechanism of action, especially with the influence mechanism of α on rockfall was the most complicated. When the unit change rate of the factor was used as the basis for sorting sensitivity, for the distance of rockfall movement, the height of bounce and the total kinetic energy, the sensitivity of Rn, Rt, f, α, m(rockfall mass), and H(initial elevation)was ranked as follows: Rt>Rn>f >H>m、H>Rt>Rn>f、m>Rn>H>Rt>f. The results can be used to determine of the impact range and damage degree of rockfall, and provide reference for design of collapse prevention and control.

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备注/Memo

备注/Memo:
收稿日期(Received date):2019-10-22; 改回日期(Accepted date): 2020-12-06
基金项目(Foundation item):国家自然科学基金(41672313,41702378)。[National Natural Science Foundation of China(41672313, 41702378)]
作者简介(Biography):柳万里(1993-), 男, 安徽宿州人, 博士研究生, 主要研究方向:岩土体稳定性与评价。[LIU Wanli(1993-), male, born in Suzhou, Anhui province, Ph.D. candidate, research on stability and evaluation of rock and soil mass]E-mail: lwl8056@qq.com
*通讯作者(Corresponding author):晏鄂川(1969-), 男, 博士, 教授, 主要研究方向:岩土工程与地质灾害。[YAN Echuan(1969-), male, Ph. D., professor, specialized in geotechnical engineering and geological hazard]E-mail: yecyec6970@163.com
更新日期/Last Update: 2021-01-30