雅西高速冕宁段主要地质灾害类型及发育规律

MAIN TYPES AND DEVELOPMENT LAW OF GEO-HAZARDS IN THE MIANNING PART OF YAAN-XICHANG EXPRESSWAY

在资料搜集、野外地质调查的基础上,对雅西高速冕宁段主要地质灾害类型及发育规律进行了分析总结,以期减少和预防高速公路遭受崩塌、滑坡和泥石流等的危害。研究表明,该区地质灾害类型主要为滑坡和泥石流,且以泥石流为主,具有分布广、密度大、危害性大等特点,在空间和时间上具有群发性和集中诱发的特征;地质构造、地形地貌、新构造运动、地层岩性是导致雅西高速冕宁段崩塌、滑坡和泥石流灾害频繁发生的内在影响因素,降雨、地震及人类工程活动是最为重要的诱发因素。

On the foundation of data collecting and field geological survey, main geo-hazard types and development law in the Mianning part of Yaan-Xichang expressway have been summarized to prevent disasters caused by collapses, landslides, debris flows. Studies showed that the main geo- hazard types in the study area were landslide and debris flow, with taking debris flow as the main content. They were characterized by wide distribution, high density and great harmfulness. In space and time, they were group-occurring and concentrative inducing. Geological structure, neotectonic movement and formation lityology were inherent effect factors of frequent occurring of such geo- hazards as collapses, landslides and debris flows in the Mianning part of Yaan-Xichang expressway. Rainfall, earthquake and human engineering activities were most important inducing factors of the geo-hazards.