As China's railway network continues to expand,constructing railways in plateau regions and rugged mountainous areas has become a necessity.However,due to steep terrain,certain sections remain inaccessible to field personnel,resulting in gaps in critical survey data.To address this challenge,a shift from traditional ground surveying to aerial surveying has been made.A semi-aerial frequency-domain electromagnetic(FEM)method that combines geophysical technology with drone technology was employed.In response to the demand for surveying long,deeply-buried tunnels in these challenging terrains,we independently designed and developed a semi-aerial electromagnetic hardware system.When compared with ground-based methods,the system demonstrated a consistency exceeding 90%.This technology has been successfully applied in the survey of a specific tunnel area,filling in the data gaps caused by steep terrain.The method significantly reduces survey costs,enhances operational efficiency,and offers a novel technological pathway for railway surveying in China.
railway surveyingplateau and rugged mountainous areassemi-aerial frequency-domain electro-magnetic method
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