Remote sensing detection of adverse geological bodies along Xichang-Shangri-La expressway

With the development of expressway construction towards the western mountainous areas in China, the adverse geological problems such as collapse, landslide and debris flow are becoming increasingly serious. It is urgent to use new technical means to identify the adverse geological bodies along the proposed expressway in the early stage of route selection. the article applied the integrated remote sensing method of " Space-Air-Ground " to identified 174 adverse geological bodies, including 74 landslides, 40 collapses, 16 debris flows and 44 deposits along the proposed Xichang-shangri-La expressway. Applied small baseline subsets interferometric synthetic aperture radar technique to detected 26 adverse geological bodies with deformation information. This article have carried out a detailed investigation and comprehensive evaluation on the section of Mopanshan tunnel - Yalong River bridge, the exit of Maoniushan tunnel, the exit of Xiamaidi tunnel where adverse geological bodies are densely developed, large in scale and poor in stability, posing great threat to the proposed line . The results provide support for routes comparison and later investigation of Xichang-Shangri-La expressway. It also provides reference for the investigation and estimate of adverse geological bodies along line engineering.