上海交通大学学报（英文版） ›› 2013, Vol. 18 ›› Issue (4): 479-485.doi: 10.1007/s12204-013-1424-z

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Propagation Characteristics of Elastic Wave in Layered Medium and Applications of Impact Imaging Method

LIU Chao (刘 超), CHE Ai-lan* (车爱兰), FENG Shao-kong (冯少孔)   

  1. (School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China)
  • 出版日期:2013-08-28 发布日期:2013-08-12
  • 通讯作者: CHE Ai-lan (车爱兰) E-mail:alche@sjtu.edu.cn

Propagation Characteristics of Elastic Wave in Layered Medium and Applications of Impact Imaging Method

LIU Chao (刘 超), CHE Ai-lan* (车爱兰), FENG Shao-kong (冯少孔)   

  1. (School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China)
  • Online:2013-08-28 Published:2013-08-12
  • Contact: CHE Ai-lan (车爱兰) E-mail:alche@sjtu.edu.cn

摘要： It is an important subject to probe the structure in the medium by various kinds of detection methods in the geotechnical engineering. Based on the propagation theory of elastic wave in half-space layered medium, the propagation characteristics of elastic wave in layered medium with different elastic parameters are discussed using dynamic analysis of finite element method. It is known that the S-wave velocity, density and thickness of layer are related to the properties of the elastic wave including waveform characteristics, spectral characteristics and time-frequency characteristics. We pay special attention to the structure with low velocity interlayer. The impact imaging method is applied to the grouting construction of the immersed tube tunnel. Data acquisition and analytical method are introduced in detail. The grouting effects can be qualitatively evaluated by comparing the characteristics of elastic wave before grouting with those after grouting. Finally, a quantitative evaluation is obtained according to the relationship between energy response of elastic wave and impedance ratio.

关键词: layered medium, elastic wave, propagation characteristics, impact imaging method

Abstract: It is an important subject to probe the structure in the medium by various kinds of detection methods in the geotechnical engineering. Based on the propagation theory of elastic wave in half-space layered medium, the propagation characteristics of elastic wave in layered medium with different elastic parameters are discussed using dynamic analysis of finite element method. It is known that the S-wave velocity, density and thickness of layer are related to the properties of the elastic wave including waveform characteristics, spectral characteristics and time-frequency characteristics. We pay special attention to the structure with low velocity interlayer. The impact imaging method is applied to the grouting construction of the immersed tube tunnel. Data acquisition and analytical method are introduced in detail. The grouting effects can be qualitatively evaluated by comparing the characteristics of elastic wave before grouting with those after grouting. Finally, a quantitative evaluation is obtained according to the relationship between energy response of elastic wave and impedance ratio.

Key words: layered medium, elastic wave, propagation characteristics, impact imaging method

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