基于斜坡单元的公路滑坡危险性评价

Risk assessment of highway landslide based on slope unit

以云南省文山州文山至天保二级公路为例,以公路为承灾对象,将斜坡作为滑坡危险性评价的基本单元,沿公路沿线两侧划分出549个斜坡单元。从斜坡发生滑坡的可能性和滑坡发生对公路造成危害的可能性两个方面,选择斜坡加权平均坡度、岩性、坡体结构、滑坡方向与公路的空间关系4个指标,建立公路滑坡危险性评价指标体系,对每个斜坡单元进行危险度计算,实现对公路沿线的滑坡危险性评价。对比评价结果与野外调查结果表明,以斜坡为研究单元能较好地实现公路沿线滑坡灾害的危险性评价,该研究方法和结果可与易损性评价和风险评价相结合,进一步实现对公路边坡灾害的风险管理与预警。

In order to assess risk of highway landslide, a second - level road in Yunnan Province is taken as an example, we divide 549 slope units along the road line by considering a slope as a basic unit in risk assessment of landslide. Aiming at the possibility of landslide occurrence and possible damage to the road induced by landslide, the highway landslide evaluation index system consisted of four indexes of weighted average slope ratio, landslide structure, lithology of landslide, spatial relation between landslide direction and highway is established. The hazard assessment for highway landslide is realized by calculating risk degree of each slope unit. Compared with in - situ investigation, it is concluded that the presented method can effectively assess the risk levels of highway landslide, further, it can realize risk management and pre - warning for highway landslide hazards through integrated methodologies of vulnerability analysis and risk analysis.