川藏铁路康定至昌都段地质灾害区域危险性评价

Evaluation of Regional Geological Hazards Risks on Kangding to Changdu Section of Sichuan-Tibet Railway

为了评判地质灾害对川藏铁路工程的影响,针对康定至昌都段地形高差大、地灾速度大、地灾规模大、构造活动强的特点,通过对现场调查和分析,将地质灾害区域危险划分为低危险区、中危险区、高危险区和极高危险区4个等级。根据灰色聚类理论,将影响线路工程的主要地质灾害归纳为崩塌-滑坡、泥石流和断层破碎带灾害,采用标度法构建判断矩阵,运用层次分析法构建地质灾害区域危险性分区模型,并将该模型运用于康定至昌都区域的地质灾害危险性分区。研究结果表明,康定至昌都区域工程地质灾害主要为高危险区,在进行工程建设时应适当提高标准,以抵御地质灾害的影响。

The Kangdin g to Chang du sect ion of S ich u an -T ib e t railway l in e is ch a ra c te r iz ed by large he ig h t dif ference of te r r a in,geological h a zard s of high sp e ed an d large s c a l e ,a n d strong te c to n ic a c t iv i ty . Thegeological h a z a rd s a re d iv id ed into four grade s ： （ Ⅰ ） low-r i s k ; （Ⅱ）m e d ium -r i s k ; （Ⅲ）h ig h - r isk an d （Ⅳ） extremely high - r isk ac co rd in g to field inve st ig at ion an d an a ly s is. T h e ma in geological ha z a rd s a re c la s s if ied into co l la p s e -la n d s l id e s, debris flows and fault fracture zone disaster based on grey cluster theory. The scaling method is employed to construct judgment matrix and the method of analytic hierarchy process （AHP） is used to establish regional geological hazards risk model. The model is applied to evaluate regional risks of geological hazards on Kangding to Changdu section. The results show that the hazards mainly fall into high-risk grade on Kangding to Changdu section and design standards should be raised during the construction to better resist the influence of geological hazards.