【摘要】 岩石的各向异性力学特性对工程安全稳定性具有重要的作用。以片麻岩为研究对象,对垂直层理和平行层理的岩样开展了波速试验、单轴压缩和点荷载试验,分析了其强度特性,讨论了岩样的破坏特征及破裂模式。结果表明:在垂直层理和平行层理两种情况下,片麻岩的波速和强度差别明显,表现出各向异性特征;在垂直层理条件下,片麻岩的点荷载强度指标Is(50)与单轴压缩强度之间的换算系数为21. 25,而平行层理条件下为14. 46;单轴压缩试验中,垂直层理的岩样以拉-剪复合模式破坏,平行层理的岩样以张拉模式破坏;在圆盘形试样的点荷载试验中,试样破裂主要有2块和3块的形式,垂直层理和平行层理加载的破坏形式也存在一定差别。更多还原

【Abstract】 The anisotropic characteristics of rock play an important role in engineering safety and stability. In gneiss as the research object,rock samples of vertical bedding and parallel bedding were analyzed by velocity test,uniaxial compression tests and point load tests,and the characteristics of rock sample destruction and burst mode were discussed. The results indicate that in two case of vertical bedding and parallel lay,that wave velocity and intensity difference of the gneiss are obviously different,and the anisotropic features are exhibited. In the case of vertical bedding,the conversion coefficient between point load strength index Is( 50)and uniaxial compression strength of gneiss is 21. 25,while in the case of parallel bedding,it is 14. 46. In uniaxial compression test,thesamples of vertical bedding are destroyed in the mode of tension-shear composite,and the rock samples of parallel bedding are destroyed in the mode of tension-shear. Inpoint load test,the sample fracture are mainly in the form of 2 and 3 blocks,vertical bedding and parallel bedding load form of destruction also has a certain difference.更多还原