Application and Research of Remote Sensing Integrated Geological Interpretation in China-Nepal Railway Survey

doi:10.19657/j.geoscience.1000-8527.2021.154

Abstract

Abstract:

The geological conditions along the China-Nepal railway are complex: strongly incised terrain, high elevation (over 4,000 m), harsh climate, and field geological engineering investigation is extremely difficult. To reduce the workload of field investigation and improve the work efficiency, this study presents the advantages of remote sensing technology, and adopts remote sensing integrated engineering geology interpretation analysis to conducted detailed analysis and research on basic geology, hydrogeology, adverse geology and other elements along the line. We show that the stratigraphic age span in the region is wide, the lithology is complex, and the fault structure is extremely developed. The regional EW-trending faults control the main strata distribution, and there are several groups of secondary faults in the near parallel direction on both sides of the faults. The NE-NEE-rending faults are active at a later time, and most of them cut the near EW-directed faults. Landslides are mainly distributed in the eastern Requ, Xiabuqu and Sajia Chongqu basins, and are mainly composed of bedrock landslides. Debris flows are widely distributed in the area, typically along the two banks of Chongqu river in the east and Sajia Chongqu, with large-scale and massive occurrence. Dangerous rocks and rockfalls are mainly distributed in the western part of the Jilong Zangbo River Valley and the eastern part of the Pengqu River Valley, which has greater impact on the selection of the tunnel entrance and the mountain line. There are two sets of near-EW-trending high geothermal abnormal zones, which are closely related to regional faults. Our results support the field engineering geological survey and line scheme design, and illustrate the supporting role of remote sensing technology in railway geological engineering survey.

Key words: remote sensing interpretation, China-Nepal Railway, fault structure, landslide, geothermal abnormal zone

CLC Number:

P237

TIAN Shequan. Application and Research of Remote Sensing Integrated Geological Interpretation in China-Nepal Railway Survey[J]. Geoscience, 2023, 37(04): 1054-1064.

Figures/Tables 13

Fig.1 Traffic location map of China-Nepal Railway

Fig.2 Remote sensing image of the study area

Fig.3 Flow chart of analysis method

Fig.4 Satellite images and photos of some lithostratigraphic units

Fig.5 Satellite image and photos of Dingri-Gangba fault

Fig.6 Satellite images of NE trending fault on the south bank of Pengqu area

Fig.7 Satellite images and photos of springs

Fig.8 Interpretation and distribution map of adverse geological elements along the China-Nepal Railway

Fig.9 Satellite image and photo of the Seang landslide group

Fig.10 Satellite image and photos of mudslides on both sides of Sajia chong river

Fig.11 Satellite images and photos of dangerous and falling rocks in the eastern part of Cuoguo Town

Fig.12 Surface temperature inversion map of the study area

Fig.13 Representative photos of hot springs in the study area

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