围压效应下砂岩声发射与压缩变形关系的细观模拟

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Abstract The macro-mechanical parameters and acoustic emission(AE) data of sandstone under various confining pressures were obtained by triaxial compression tests and AE tests. According to laboratory testing results，the spatial and temporal distributions of AE in compression deformation of sandstone under different confining pressures were simulated from mesoscopic aspect by using the particle flow code(PFC2D). Considering different development patterns of the tension and shear cracks，the relation between AE characteristics during the compression deformation of sandstone and the brittle-ductile transition is established. The study shows that under low confining pressure，AE tests experienced the“quiet period”，“developing period”，“erupting period” and “dropping period”. The cracks were mainly constituted by tension cracks with a few shear cracks，which were concentrated in the shear zone. Under high confining pressure，no obvious drop appeared after“erupting period”of AE. Before the peak strength，the dispersed shear cracks were more than the tension cracks，but concentrated connected tensile cracks were more than the shear cracks after the peak strength. The AE mainly based on tension cracks reflects a brittle characteristic of failure. And when numbers of shear cracks are developed，it indicates that the specimen is transited from brittle to ductile one.

Key words： rock mechanics confining pressure effect acoustic emission(AE) compressive deformation brittle-ductile transition mesoscopic simulation

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https://rockmech.whrsm.ac.cn/EN/Y2014/V33/Isl/2786

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