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The Analysis Method of Time Reversal for Defect Diagnosis of concealed structure

Journal of Southeast University(English Edition) 1999年第1期15卷 113-116页

作者：韩晓林汪凤泉朱宽军东南大学工程力学系

In this paper, a new method of time reversal for defect diagnosis of concealed structure has been proposed based on the detecting technique of structure acoustic wave and the theory of time reversal. The time reversal recurrence formula for detecting the acoustic wave speed constitution of concealed structures with bilevel asynchronous test has been established. The wave speed constitution can be reconstructed in 2 D graticule form by means of this method. The result of model test shows the method is valid.

关键词： defect diagnosis time reversal concealed structure

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Application of the High-resolution EM Method in the Investigation of B Tunnel

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Applied Geophysics 2005年第3期2卷 140-144,i0001页

作者：何兰芳何展翔王绪本张希哲杨轮凯中国石油集团东方地球物理公司涿州072751 成都理工大学成都610059

A successful case history of exploring for concealed structure using the high-resolution EM method in the investigation of the West-East Gas Pipeline Project＇s B Tunnel is presented in this paper. The high frequency electromagnetic image system named STRATAGEM EH4, operating at frequencies ranging from 90KHz to 1Hz, was used for data acquisition. The orthogonal components of the electromagnetic field were measured during the field acquisition and the relevant electromagnetic attributes of the object body were extracted from the electromagnetic data. Hybrid sources, consisting of natural and full tensor-controlled sources, were utilized to produce high-quality electromagnetic field data. B Tunnel lies in the western part of Hubei province, at depths of less than 200m. The geologic setting of B tunnel is very complex. Following an initial geologic investigation, an outcrop considered to be a bedrock interface by investigators, collapsed during tunneling operations. A second investigation applied high-resolution EM and seismic refraction methods to reveal a more complex geologic structure along the tunnel route. The predicted rock classes and fault were encountered during the subsequent tunneling operations.

关键词： HFEM HREM concealed structure and tunnel Investigation

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