Field investigations have proven that layer‐crack structures make an essential contribution to rock burst occurrence in brittle coal or rock mass. This paper first studies the mechanical behavior of layer‐crack red sandstone specimens with different geometric configurations of vertical fissures (ie, fissure width, fissure length, and fissure number) through uniaxial compression and Brazilian tests. Then, the digital speckle correlation method (DSCM) and acoustic emission (AE) technique are used to record the deformation and failure processes. Finally, the failure mechanisms of the layer‐crack structure are presented and discussed. Under compressive conditions, the failure process can be divided into compatible support, incompatible support, and postpeak unstable failure stages. An increase in fissure width, as well as fissure length or number, causes an increase in the inner damage accumulation and a decrease in the stiffness coefficient by decreasing the strain of the compatible support stage. Thus, the bearing capacity of the layer‐crack structure is weakened. Under tensile conditions, the tensile ability decreases linearly as the fissure length increases, but the vertical pressure acting on the fissure increases linearly as the fissure width increases. Thus, the tensile strength of the layer‐crack structure decreases as the fissure length (or width) increases.

中文翻译：

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层裂结构破坏机理的实验研究

现场调查证明，层裂结构对脆性煤或岩体中的岩石破裂产生了重要的作用。本文首先通过单轴压缩和巴西试验研究了具有不同垂直裂缝结构（即裂缝宽度，裂缝长度和裂缝数）的层裂红砂岩标本的力学行为。然后，利用数字散斑相关方法（DSCM）和声发射（AE）技术记录变形和破坏过程。最后，介绍并讨论了层裂结构的破坏机理。在压缩条件下，故障过程可以分为兼容支持，不兼容支持和峰值后不稳定故障阶段。裂缝宽度以及裂缝长度或数目的增加，通过减小兼容支撑平台的应变，会导致内部损伤累积的增加和刚度系数的减小。因此，层裂结构的承载能力减弱。在拉伸条件下，抗裂能力随着裂缝长度的增加而线性降低，但是作用在裂缝上的垂直压力随着裂缝宽度的增加而线性增加。因此，层裂结构的抗拉强度随着裂缝长度（或宽度）的增加而降低。但是作用在裂缝上的垂直压力会随着裂缝宽度的增加而线性增加。因此，层裂结构的抗拉强度随着裂缝长度（或宽度）的增加而降低。但是作用在裂缝上的垂直压力会随着裂缝宽度的增加而线性增加。因此，层裂结构的抗拉强度随着裂缝长度（或宽度）的增加而降低。