单轴压缩条件下花岗岩中不同矿物的形状变化

发布时间：2018-12-10 12:05

【摘要】：岩石中不同矿物的形状变化反映了岩石的变形破坏过程。在分析花岗岩试样表面图像不同矿物纹理特征基础上,使用室内单轴压缩试验视频图像和灰度分界阈值分割法,研究了单帧图像中不同矿物的分布特征,使用形状参数描述了岩石变形过程中不同成分的形状特征,探讨了不同成分区域形状变化与裂隙扩展过程的关系。结果表明,花岗岩变形过程中圆形度的大小顺序为长石黑云母石英,内切圆半径的大小顺序为黑云母长石石英;离散指数的大小顺序为长石石英黑云母;长石承受了轴向力的主要部分,形状变化与所处位置关系较大;破坏过程中裂隙面积出现大小顺序为长石、石.英、黑云母,裂隙扩展较快时裂隙大多出现在长石和石英区域。
[Abstract]:The shape change of different minerals in rock reflects the process of rock deformation and failure. Based on the analysis of different mineral texture features of granite surface images, the distribution characteristics of different minerals in single frame images were studied by using indoor uniaxial compression test video image and gray threshold segmentation method. Shape parameters are used to describe the shape characteristics of different components in the process of rock deformation and the relationship between the regional shape change of different components and the process of fracture expansion is discussed. The results show that the order of roundness during granite deformation is feldspar biotite quartz, the order of radius of inner tangent circle is biotite feldspar quartz, the order of dispersion index is feldspar quartz biotite; The feldspar bears the main part of axial force and the shape change is related to the location of the feldspar, and the order of crack area appears in the process of failure is feldspar and stone. In Britain, biotite, fractures are mostly found in feldspar and quartz areas.
【作者单位】：上海大学土木工程系;
【基金】：国家自然科学基金(No.51472254) 上海市科委重点支撑项目(No.13231200400) 上海市青年科技启明星计划项目(No.13QB140340) 上海市产学研合作年度计划项目(No.沪CXY-2013-9)
【分类号】：TU45

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