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Velocity-Free MS/AE Source Location Method for three-dimensional hole-containing Structures

Engineering 2020年第7期6卷 827-834页

作者： Longjun Dong Qingchun Hu Xiaojie Tong Youfang Liu School of Resources and Safety Engineering Central South UniversityChangsha 410083China Department of Geophysics Colorado School of MinesGoldenCO 80401USA

Microseismic/acoustic emission(MS/AE)source localization method is crucial for predicting and controlling of potentially dangerous sources of complex ***,the locating errors induced by both the irregular structure and pre-measured velocity are poorly understood in existing *** meet the high-accuracy locating requirements in complex three-dimensional hole-containing structures,a velocity-free MS/AE source location method is developed in this *** avoids manual repetitive training by using equidistant grid points to search the path,which introduces A*search algorithm and uses grid points to accommodate complex structures with irregular *** also takes advantage of the velocity-free source location *** verify the validity of the proposed method,lead-breaking tests were performed on a cubic concrete test specimen with a size of 10 cm10 cm10 *** was cut out into a cylindrical empty space with a size of/6cm10 *** on the arrivals,the classical Geiger method and the proposed method are used to locate lead-breaking *** show that the locating error of the proposed method is 1.20 cm,which is less than 2.02 cm of the Geiger ***,the proposed method can effectively locate sources in the complex three-dimensional structure with holes and achieve higher precision requirements.

关键词： Microseismic source Acoustic emission Velocity-free location method three-dimensional hole-containing structures

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