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Application of Remote Sensing Technology in Karst Railway Engineering Geological Survey |
LIU Guiwei, WANG Yanhui, CHANG Tianlong, SUN Qihao, ZHANG Xuanyu |
China Railway Design Corporation, Tianjin 300251, China |
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Abstract Research purposes: Karst is widely distributed and strongly developed in mountainous areas of South China, which presents complexity and concealing characteristics. It is easy to induce tunnel water inrush and other risks, posing a great threat to railway construction safety. Taking Guangzhou-Qingyuan-Yongzhou Railway as an example, this paper uses three-dimensional remote sensing and GIS spatial analysis technology to find out macro-hydrogeological features such as geological structure and karst landform based on multi-source remote sensing data, and calculates the catchment area of tunnel in karst area, which provides scientific reference for route selection design and karst disaster prevention. Research conclusions: (1) Most of the fault structures along the line are concentrated in the Lanshan-Lianzhou section, and 138 fault structures and 9 folds are identified by remote sensing interpretation. The fault structures are mainly S-N trending, and the folds are NE-NNE trending. (2) Karst depressions, residual hills and solitary peaks are developed, and several underground river outlets are exposed, most of which show the characteristics of beheaded river. (3) By selecting the influencing factor of water catchment area, generating the minimum gully catchment area, optimizing the water catchment unit and classifying the area with the same karst development degree, the calculated water catchment area of the karst tunnel is 56.83 km2, which provides an important parameter for the calculation of water inflow of the karst tunnel. (4) The research results can be applied to railway engineering geological survey in karst area.
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Received: 26 September 2022
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