摘要
不合理的人类工程活动是陕北黄土高原地区滑坡、崩塌等地质灾害的主要诱发因素之一,延安市杨崖滑坡是一个典型的多期人为诱发的滑坡。通过对杨崖滑坡力学变形破坏模式和形成因素的分析,认为杨崖滑坡为拉裂-压致滑移式变形过程,是先牵引、后推移的发育破坏过程,滑体的多次强烈扰动与老滑坡滑面的存在为滑坡形成的控制因素,不合理的削坡和人工削坡加载是其形成的诱发因素;对致灾原因进行了分析,选址不当、防灾避灾意识不强和治理措施不当是造成滑坡灾害的主要原因。
Unreasonable engineering activity is one of the main factors inducing geohazards such as landslides and rockfalls in the loess plateau of northern Shaanxi. The Yangya landslide in Yan＇an City is a typical multi-stage, human-induced landslide. According to the failure model and forming factor of the Yangya landslide, it can be concluded that the Yangya landslide occurred through a process of extensional rupture-compressional slip deformation, i.e. a process of development and failure of dragging before pushing. The control- ling factors of landslide formation are multiple intense disturbance and existence of the previous slide surface, and the triggering factors i nclude unreasonable excavation, cutting and loading by mankind. Based on the analysis of the disaster causes, the authors think that im- proper selection of the site, poor consciousness of hazard prevention and incorrect control measures are the main causes of the disaster.
出处
《地质通报》
CAS
CSCD
北大核心
2008年第8期1230-1234,共5页
Geological Bulletin of China
基金
中国地质调查局项目<陕西省延安市宝塔区地质灾害详细调查>(编号:1212010541106-3)资助。
关键词
延安市
杨崖滑坡
形成因素
控制因素
诱发因素
致灾
Yan＇an City
Yangya landslide
forming factor
controlling factor
triggering factor
disaster cause
