Although cylindrical and prismatic specimens are often used in laboratory tests, the differences between their deformation and failure characteristics remain unclear. Cylindrical and prismatic specimens of two rocks (marble and granite) were analyzed under various conventional triaxial conditions. The failed prismatic specimens exhibit multiple fractures intersecting in the cross section. With increasing confining pressure, the failure mode of the prismatic specimen changes from tensile failure to shear failure. In the progressive failure process of prismatic specimens, the two lateral strains ε₂ and ε₃ are the same before the peak, but some differences arise after some degree of post-peak failure, where the acoustic emission (AE) activity clearly increases. The mechanical parameters (peak strength, internal friction angle, cohesion, Young's modulus, and Poisson's ratio) determined for the cylindrical and prismatic specimens are consistent. However, a significant difference in the fracture morphology exists among them, even with similar change trends in the tensile-shear failure mode with confining pressure.

尽管圆柱形和棱柱形试样经常用于实验室测试，但它们的变形和破坏特性之间的差异仍不清楚。在各种常规三轴条件下分析了两种岩石（大理石和花岗岩）的圆柱形和棱柱形试样。失效的棱柱形试样在横截面中显示出多个相交的裂缝。随着围压的增加，棱柱形试件的破坏模式从拉伸破坏转变为剪切破坏。在棱柱试样的渐进破坏过程中，两个侧向应变ε ₂和ε ₃在峰值之前是相同的，但在一定程度的峰值后失效后会出现一些差异，其中声发射 (AE) 活动明显增加。为圆柱形和棱柱形试样确定的机械参数（峰值强度、内摩擦角、内聚力、杨氏模量和泊松比）是一致的。然而，它们之间的断裂形态存在显着差异，即使在围压下的拉伸-剪切破坏模式的变化趋势相似。