| With the rapid development of the national economy,a large number of underground space projects are about to be built and are being constructed in the areas of transportation,hydropower and so on.However,more and more underground projects are being built in the southwestern mountainous regions where the geological conditions are complicated particularly.Karst is one of the most common geological disasters in China's engineering construction.Currently,geophysical prospecting methods have been widely used to explore karst geological hazards in engineering field.But the method of rapid detection for large areas is not yet mature.This paper has developed a shallow karst semi-airborne TEM detection method research combining the experience of ground TEM detection in karst area.The response regular of shallow karst is studied,and the flight trial based on unmanned aerial vehicle is carried out in the field.In this paper,the semi-airborne TEM response characteristics of shallow karst are the main research objects taking the combination of theoretical research and field experiments.I researched the type as "terrestrial launch-air reception" semi-airborne TEM detection method on the basis of ground transient electromagnetic detection.And based on the characteristics of geoelectric properties in karst areas,I researched the response regular of semi-airborne TEM.In terms of the research on the response regular of semi-airborne TEM,the response characteristics of semi-airborne TEM with homogeneous half-space model and typical layered model in the device type for terrestrial launch-air reception are studied based on the previous 3D finite-difference time domain algorithm for the research of the response regular for semi-airborne TEM.The validity and sensitivity of the semi-airborne TEM to the perception and identification of formation resistivity are verified.Combined with the characteristics of typical karst geological hazard sources,the 3-D karst cave models of various disaster sources were established,and the semi-airborne TEM response regular of the 3-D karst geoelectric model was explored.At last,the flight trial based on the multi-rotor unmanned aerial vehicle is carried out in the field.The validity and feasibility of semi-airborne TEM response to complicated karst geological conditions are verified through the processing and analysis of trial data.In this paper,the research on the response regular and experiment of semi-airborne TEM provides a reference for the subsequent theoretical research and practical application,especially for the semi-airborne TEM response characteristics of the complicated karst geological conditions. |
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