Remote sensing interpretation and analysis of key engineering geological problems in the Nalati Mountain crossing section of the Yining-Aksu Railway

Abstract

The Yining-Aksu Railway needs to cross the Tianshan Mountains twice from north to south. The natural climate and geological environment are harsh and complex at the crossing section of Nalati Mountain on the north side. The design and selection of the route scheme are obviously constrained by geological conditions, and the preliminary route selection survey requires to thoroughly determine all kinds of geological problems in the area. In this study, multisource data(e.g., Gaofen-2 images, Landsat 8 satellite images, and aerial high-resolution images) were used to perform detailed interpretation and analysis of the Nalati mountain crossing section, showing that there are densely developed landslide deformation areas along both banks of the Qiapu River, and the landslide groups on the left bank of the Qiapu River significantly impact the route scheme. The EW-NEE trending seismic-active fault zones in the area are mainly developed in the Meso-Cenozoic soft strata, with the southern margin of the Nalati fault and the Qiapu River fault as the typical ones, all of which have the phenomenon of local 're-movement'; the rockfall hazard regions in the upper reaches of the Gongnai River is mainly distributed in the intersection area of Highway G217 and G218 and its east areas, mainly in the sunny slope area.The results provide reliable basic data for field engineering geological surveys and route scheme comparisons, verifying the guiding function of the remote sensing in railway surveys in complex mountainous areas.

Keywords

• remote sensing
• yining-aksu railway
• landslide
• active fault
• unstable rock