Mechanism Analysis on the Jiweishan Rockfall Disaster Happened in Wulong,
详细信息
- 责任者：Liu Chuanzheng (China Institute for Geo-Environment Monitoring ; Beijing 100081 ; China)
- 刊名：Journal of Engineering Geology
- 出版年：2010
- 卷期：18(3)
- 关键词：危岩体 ; unstable rock ; 崩塌 ; avalanches ; 重庆 ; Chongqing
- 页码：p.297-304
- 图表：illus., 1 table, 14 refs.
- 分类号：1800
- issnNo：ISSN1004-9665
- isbnNo：CN11-3249/P
摘要
The Jiweishan event happened at June 5, 2009 in Wulong County of Chongqing Municipality of China. It is a basic condition in substance and structure that Jiweishan rockmass is of layered limestone, weak interlayers and fissures approximately in SN and EW direction. Based analogical analysis, Jiweishan dangerous rockmass may be result from pull cracks in the mountaintop produced by “cantilever plate effect” which derives from great iron ore mined out area under mountain. It is obtained from the sliding force analysis in apparent direction that outward apparent sliding force makes rockmass in crawling into rockfall gradually by through to overcome a friction force from its bottom and a resistant shearing force on its front end. The Jiweishan rockfall disaster is induced by iron ore mined out area and the apparent direction sliding force together. It is a process in chain reaction that consists of “rockmass cracks—creep sliding along weak layer—bursting rockfall—debris impact—come into being disaster”. The dynamical source of the event is explained for emergency management decision and a simple method in technical support for similar problems is put forward in this paper.