The tunnel in the karst area is close to the pier foundation of the railway bridge,and the railway bridge has been constructed for a long time,so it is difficult to verify the completion data of the foundation.This paper puts forward a comprehensive survey method,which combines electromagnetic wave CT with drilling and micro motion method to detect the foundation type of the pier and the karst development under the foundation,which not only provides a more accurate basis for the tunnel design,but also provides a feasible integrated survey and geophysical exploration method for similar projects.
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