层理倾角对岩石力学与声发射特征的影响研究

发布时间：2018-06-10 20:33

本文选题：岩石力学 + 层状岩石　；参考：《金属矿山》2017年02期

【摘要】：层理倾角对岩石受载下的力学性质和声发射特征有重要的影响。通过对0°、15°、30°、45°、60°、75°、90°倾角试样的单轴压缩模拟试验,获得了层理岩石抗压强度、破坏模式、声发射振铃数等随层理倾角的变化规律。研究结果表明:1随着层理倾角的增加,试样单轴抗压强度存在着先增大后减小又增大的过程;2大致分为3种破坏模式,15°和30°倾角试样劈裂与剪切破坏并存,以劈裂破坏为主,属于先基质后层理型破坏;45°、60°、75°倾角试样劈裂裂纹相对较少,剪切破坏显著,属于先层理后基质型破坏;0°和90°倾角试样出现大断口,属于局部强烈基质型破坏;30°、15°、30°和90°倾角试样声发射静默期长,活跃期短,其最大声发射数大,声发射增长速率快;而45°、60°和75°倾角试样静默期短,活跃期长,其最大声发射数小,声发射增长速率慢。
[Abstract]:The lamination angle has an important influence on the mechanical properties and acoustic emission characteristics of rock under loading. Through the uniaxial compression simulation test of 0, 15, 30, 45, 60, 75, 90 degree angle, the change law of bedding rock compressive strength, failure mode and acoustic emission ringing number with bedding inclination is obtained. The results show that 1 with bedding inclination. With the increase of angle, the uniaxial compression strength of the specimens first increases and then decreases and increases; 2 is roughly divided into 3 types of failure modes. The splitting and shear failure of the 15 and 30 degree angle specimens coexist, and the splitting failure is the first one, which belongs to the pre matrix bedding type failure; 45 degrees, 60 degrees and 75 degrees angle specimens have relatively few splitting cracks, and the shear failure is significant first. After lamination, 0 and 90 degree angle specimens appear large fracture, belonging to local strong matrix type failure. 30, 15, 30 and 90 degrees are long, short active, large acoustic emission and rapid growth rate, while 45, 60 and 75 degrees are short, active period is long, and its maximum acoustic emission number is small. The growth rate of acoustic emission is slow.
【作者单位】：中国矿业大学力学与土木工程学院;深部岩土力学与地下工程国家重点实验室;
【基金】：国家自然科学基金项目(编号:51604260) 国家重点研发计划项目(编号:2016YFC0600705) 中国博士后科学基金项目(编号:2016T90519) 江苏省博士后科研计划项目(编号:1501085B) 四川省科技厅科技支撑计划项目(编号:2012fz0124) 国家大学生创新训练计划项目(编号:201610290013)
【分类号】：TU452

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