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The Principle and Application of Landsonar Method in Railway Geological Survey and Tunnel Construction

Zhong Shihang(China Academy of Railway Sciences)  
On the basis of georadar,seismic reflection exploration, ultrasonic wave methodand sonar method,we have developed the Landsonar Method featuring elastic reflectionwave of continuos profiling with high frequency and very short source-detector distance,Thenew method has some specialties such as low noise waves, simple images and higt energy ofreflection waves.In the paper the author described the basic principle and sorne successfulengineering examples which serve to show some characteristics of this method.
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