Compression-induced shear-mode cracks play an important role in the failure process of rocks. To gain insight into the compression-induced shear-mode cracks in rocks, the initiation and propagation of compression-induced shear-mode cracks are investigated via physical experiments and numerical simulations. The experimental results show that compression-induced shear-mode cracks are a common fracture mode and often lead to final failure. The initiation and propagation of compression-induced shear-mode cracks, as well as the strength of the specimen, can be influenced by the spacing between the flaw tips. Compression-induced shear-mode cracks easily initiate and propagate when the spacing between the two pre-existing flaws is small, whereas a larger spacing can reduce the possibility of shear fracturing and is propitious to the generation of compression-induced tensile-mode cracks. In addition, compression-induced shear-mode cracks initiate and generate later than compression-induced tensile-mode cracks. Furthermore, the fracture angles of compression-induced shear-mode cracks are diverse and complex and can be influenced by the spacing between pre-existing flaws. Numerical simulation results suggest that compressive-shear failure initiates randomly in a shear stress field, becomes more localized with the increased loading and eventually results in compression-induced shear-mode cracks.

压缩引起的剪切模式裂缝在岩石破坏过程中起着重要作用。为了深入了解岩石中的压缩引起的剪切模式裂纹，通过物理实验和数值模拟研究了压缩引起的剪切模式裂纹的萌生和扩展。实验结果表明，压缩引起的剪切模式裂纹是常见的断裂模式，通常会导致最终破坏。压缩引起的剪切模式裂纹的萌生和扩展以及试样的强度会受到裂纹尖端之间的间距的影响。当两个预先存在的裂纹之间的间距较小时，压缩引起的剪切模式裂纹很容易引发和扩展，相反，较大的间距可以减少剪切断裂的可能性，并且有利于产生压缩引起的拉伸模式裂纹。另外，压缩引起的剪切模式裂纹的产生和产生要晚于压缩引起的拉伸模式裂纹的产生。此外，压缩引起的剪切模式裂纹的断裂角度是多样且复杂的，并可能受预先存在的缺陷之间的间距影响。数值模拟结果表明，压剪破坏在剪切应力场中随机发生，随着载荷的增加而变得局部化，最终导致压缩引起的剪切模式裂缝。压缩引起的剪切模式裂纹的断裂角度是多种多样的，并且很复杂，并且可能受预先存在的裂纹之间的间距的影响。数值模拟结果表明，压剪破坏在剪切应力场中随机发生，随着载荷的增加而变得局部化，最终导致压缩引起的剪切模式裂缝。压缩引起的剪切模式裂纹的断裂角度是多种多样的，并且很复杂，并且可能受预先存在的裂纹之间的间距的影响。数值模拟结果表明，压剪破坏在剪切应力场中随机发生，随着载荷的增加而变得局部化，最终导致压缩引起的剪切模式裂缝。