Multi-frequency ultrasonic underground cavity scanning detection technology in borehole

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Wang, Jinchao [1 ]
Wang, Chuanying [1 ]
Han, Zengqiang [1 ]
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[1] State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan,Hubei,430071, China
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