伊宁至阿克苏铁路那拉提山越岭段关键性工程地质问题遥感解译与分析

伊宁至阿克苏铁路由北至南需2次翻越天山, 北侧那拉提山越岭段自然气候恶劣、地质环境复杂, 线路方案的设计、选择明显受地质条件的约束, 前期选线勘测需要彻底摸清区内各类地质问题。在分析区域地质构造背景的基础上, 采用高分二号、Landsat8卫星影像和航空高分辨率影像等多源数据, 对区内存在的恰普河中游及巩乃斯镇东滑坡群、近EW-NEE向地震活动断裂带、巩乃斯河上游危岩落石区等关键地质问题开展了详细的解译分析, 结合现场调查, 对其发育位置、规模、形态、稳定性等进行了评价, 为外业工程地质勘察、线路方案比选提供了可靠的基础资料, 充分发挥了遥感技术在复杂山区铁路勘察中的指导作用。 

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

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.