二郎山—折多山大渡河深切峡谷区地质灾害发育特征及对输变电工程的影响

Development Characteristics of Geological Disasters in Deep Cut Canyon Area of DaduRiver from Erlang Mountain to Zheduo Mountain and Its Impact on Power Transmission and Transformation Projects

摘要:

以二郎山—折多山大渡河深切峡谷区输电走廊沿线为研究对象，基于遥感解译及地质灾害调查对区内地质灾害发育特征以及对输变电工程的影响进行了研究。结果表明：研究区内地质灾害主要形成控制因素有地形地貌、坡向、地质构造、工程地质岩组、年降雨量等；地质灾害主要分布于2200 m以下高程，坡度介于15°~50°，崩塌主要发育于坚硬或较坚硬岩，滑坡发育于软硬互层岩组；崩塌、滑坡主要分布于降雨量为834~965 mm的区域，泥石流主要分布于降雨量为892~1085 mm的区域；二郎山—折多山大渡河深切峡谷区输电走廊沿线现状地质灾害发育对输变电工程的杆塔及其基础的稳定性造成威胁。研究成果可为输电走廊沿线地质灾害评价与防治提供理论依据，为输变电工程规划选线、设计及施工提供技术指导。

Abstract:

Based on remote sensing interpretation and geological disaster investigation, and taking the transmission corridor in deep cut canyon area of Dadu River from Erlang Mountain to Zheduo Mountain as research object, the development characteristics of geological disasters in this area and the impact on power transmission and transformation projects are studied. The results show that the main controlling factors for the formation of disasters in this area include topography, slope orientation, geological structure, engineering geological petrofabric and annual rainfall, etc. Geological disasters in this area are mainly distributed at elevations below 2200 m, with slopes ranging from 15° to 50°. Collapses are mainly developed in hard or relatively hard rocks, and landslides are developed in soft hard interbedded rock masses. Collapses and landslides are mainly distributed in areas with rainfall ranging from 834 to 965 mm, and debris flows are mainly distributed in areas with rainfall ranging from 892 to 1085 mm. So, the current geological disasters along the transmission corridor in deep cut canyon area of Dadu River from Erlang Mountain to Zheduo Mountain pose a threat to the stability of towers and its foundation of power transmission and transformation projects. The research results can provide a theoretical basis for the evaluation and prevention of geological disasters along the transmission corridor, and provide a technical guidance for the planning, route selection, design and construction of power transmission and transformation projects.