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《Acta Seismologica Sinica》 2002-06
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A STUDY ON RELATION BETWEEN ACOUSTIC EMISSION AND CHARACTERISTIC DISPLACEMENT FIELD ON THE SAMPLE WITH MULTI EN ECHELON STRUCTURES——THE THEORETIC AND EXPERIMENTAL EXPLORATIONS OF STRAIN GAP

Chen Shunyun1) Xu Zhaoyong1) Yang Runhai1) Zhao Jinming1) Hao Jinqi2) Wang Yunyun1) Xiong Bingheng2) Wang Zhengrong3) 1)Institute for Disaster Prevention of Yunnan Province, Kunming 650041,China 2)Institute of Geophysics,China Seismological Bureau, Beijing 100081, China 3)Laser Institute, Kunming Technology University, Kunming 650051,China  
Based on the phenomena, which the deformation gap was observed before the Tangshan Great Earthquake, this paper discusses the strain gap on test and theory. The (strain) patterns were recorded photographically by real-time holographic interferometry and shadow optical method of caustics, as soon as the loading process had been started. In the meantime, the AE (acoustic emission) signals were recorded by a microcrack information storage-analysis system. According to damage theory and location of microfracture, we have studied the stain gap and gained: ①it is necessary that strain gap appears under the condition of linear elasticity theory, and its situation is relatively stable, corresponding to stress concentration. ②Microfractures, which appear initially at area of high stress, occur rarely at the strain gap, and their locations are finally in the zone between the stress concentration area and the strain gap, which indicate the clusters or groups. However, the major macro fracture (final rupture) started from the shadow areas, and then grew quickly towards the strain gaps, which resulted in failure of sample.
【Fund】: 中国地震局双重项目(9691309020301);; 国家重点基础研究专项经费(G1998040704)主要资助;; 中国地震局“十五”项目(2001BA601B02-01-02);; 云南省科技厅应用基础研究青年基金项目(98D019Q)部分资助.
【CateGory Index】: P315.8
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