宜攀高速金宁段全长100余km,全线位于新建和在建的巨型水电站库区,库岸再造问题对线路工程影响突出。类似复杂条件下超长线路工程库岸再造的影响及评价工作缺乏工程借鉴。首先对沿线地形地貌、地层岩性、地质构造、岸坡结构、水文气象等影响库岸再造的因素进行调研和区划,然后采用定性判断和定量分析相结合的方法对沿线岸坡现状稳定性进行评价和区划。在此基础上开展相关性分析,研究库岸再造灾害主控因素、发育特征及规律,据此对线路工程可能遭遇的库岸再造灾害影响进行综合评价和区划。结果表明:①地层岩性是影响库岸再造灾害发育的主控因素;②蓄水对岸坡稳定性影响明显;③沿线大规模滑坡主要发育在软岩顺向坡部位。研究成果为金宁段线路工程规划及设计提供了依据,也可为今后类似工程建设提供借鉴。

Jinyang-Ningnan segment of Yibin-Panzhihua highway, with a total length of more than 100 km, is located in the reservoir area of the newly constructed and being constructed giant hydropower stations. Reservoir bank reformation has a significant impact on the highway project. However, there is no similar engineering experience that can be referred to as we investigate the effects of reservoir bank reformation along such ultra-long highway under complex conditions. In this paper, we first of all examined and classified the factors affecting bank reformation. Such factors include landform, formation lithology, geological structure, bank slope structure, and hydro-meteorology. Subsequently, we assessed the stability of bank slope along the highway by qualitative and quantitative means. Furthermore, we revealed the control factors, development characteristics and laws of hazards during reservoir bank reformation via correlation analysis.Results suggest that lithology is the dominant controlling factor of reservoir bank reformation; impoundment has evident imapct on the stability of reservoir bank slope; large-scale landslide mainly develops in the bedding slope of soft rock. The research finding offers support for the planning and design of the studied highway project, and also a reference for similar projects in future.