气候变化领域集成服务门户(CCPortal): Initiation mechanism of Jiweishan high-speed rockslide in Chongqing, China

CCPortal

DOI	10.1007/s11069-020-04154-x
	Initiation mechanism of Jiweishan high-speed rockslide in Chongqing, China
	Zhao Z.; Deng L.
发表日期	2020
ISSN	0921030X
起始页码	3765
结束页码	3781
卷号	103 期号:3
英文摘要	A rockslide of 5.0-million-m3 volume occurred on June 5, 2009, in Jiweishan, Chongqing, China. The field investigation indicates that the kinetic process of the Jiweishan rockslide was divided into four stages: the initiation of ejection, flying and scraping, colliding and direction altering, and stopping and accumulating. The rock mass had been considered stable according to the principle of statics. To investigate the possible initiation mechanism, the present research proposes a new initiation model that considers the vibration effects as a shaking force (F), which acts against the rockslide mass in the direction normal to the rupture surface at the same instant when the brittle limestone is ruptured. The amplitude of F was best estimated as \| τ· A F\| , where τ and AF are the shear stress and area of the rupture surface, respectively; under this model, the initial ejection direction agrees very well with the observed direction. The movement characteristics of the slide were later identified by assuming a variety of friction angles (at 0°, 5°, 10°, and 15°) at the weak slip surface. It is observed that when the friction angle ranged from 0° to 5°, the velocity of the rockslide reached 68.3–79.2 m/s and the rockslide mass could fly to the observed scraping area. Furthermore, the velocity and duration at each moving stage were estimated, using the assumptions in the shaking force and friction angle. Results show that the total travel time of Jiweishan rockslide was 66.8–78.6 s, which is close to 60 s as estimated by eyewitnesses and the seismic wave records. © 2020, Springer Nature B.V.
关键词	Initiation mechanism Jiweishan rockslide Movement Shaking force
英文关键词	landslide; limestone; rupture; shear stress; travel time; vibration; China; Chongqing
语种	英语
来源期刊	Natural Hazards
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206053
作者单位	Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, Sichuan, China; Department of Civil and Environmental Engineering, University of Alberta, Edmonton, AB, Canada
推荐引用方式 GB/T 7714	Zhao Z.,Deng L.. Initiation mechanism of Jiweishan high-speed rockslide in Chongqing, China[J],2020,103(3).
APA	Zhao Z.,&Deng L..(2020).Initiation mechanism of Jiweishan high-speed rockslide in Chongqing, China.Natural Hazards,103(3).
MLA	Zhao Z.,et al."Initiation mechanism of Jiweishan high-speed rockslide in Chongqing, China".Natural Hazards 103.3(2020).