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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摘要通过三轴压缩试验和声发射(AE)试验，得到砂岩不同围压下全应力–应变过程的声发射数据。基于室内试验结果，采用颗粒流软件PFC2D，从细观角度模拟不同围压下砂岩压缩变形过程中的声发射时空分布，并考虑张拉和剪切2种裂纹的不同发育规律，建立砂岩压缩变形过程中声发射特征与脆延转换之间的联系。研究表明，低围压下声发射经历“平静期”、“发展期”、“爆发期”和“回落期”，声发射主要为张拉裂纹，且集中在剪切带上,并伴随少量剪切裂纹；高围压下声发射在“爆发期”后并没有明显的回落；峰值强度前弥散分布的剪切裂纹数量大于张拉裂纹，峰后相对集中而贯通的张拉裂纹数量超过剪切裂纹；张拉裂纹为主的声发射体现出脆性破坏特征，剪切裂纹大量发育则预示着试样由脆性向延性转换。

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关键词 ：岩石力学, 围压效应, 声发射, 压缩变形, 脆延转换, 细观模拟

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

引用本文:

穆康1，李天斌2，俞缙1，2，蔡燕燕1，2，刘士雨1，涂兵雄1，江浩川1. 围压效应下砂岩声发射与压缩变形关系的细观模拟[J]. 岩石力学与工程学报, 2014, 33(sl): 2786-2793.
MU Kang1，LI Tianbin2，YU Jin1，2，CAI Yanyan1，2，LIU Shiyu1，TU Bingxiong1，JIANG Haochuan1. MESOSCOPIC SIMULATION OF RELATIONSHIP OF ACOUSTIC EMISSION AND COMPRESSIVE DEFORMATION BEHAVIOUR IN SANDSTONE UNDER CONFINING PRESSURES EFFECT. , 2014, 33(sl): 2786-2793.

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http://www.rockmech.org/CN/Y2014/V33/Isl/2786

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