The crack volume strain method and acoustic emission (AE) method are used to analyze the anisotropy of the crack initiation strength, damage strength, the failure mode and the AE characteristics of coal reservoir. The results show that coal reservoirs show obvious anisotropic characteristics in compressive strength, cracking initiation strength and damage strength. The compressive strength of coal reservoirs decreases with the increase of bedding angle, but the reservoirs with bedding angles of 45° and 90° differ little in compressive strength. The crack initiation strength and damage strength decrease first and then increase with the increase of bedding angle. The crack initiation strength and damage strength are the highest, at the bedding angle of 0°, moderate at the bedding angle of 90°, and lowest at the bedding angle of 45°. When the bedding angle is 0°, the failure of the coal reservoirs is mainly steady propagation of large-scale fractures. When the bedding angle is 45°, one type of failure is caused by steady propagation of small-scale fractures, and the other type of failure is due to a sudden instability of large-scale fractures. When the bedding angle is 90°, the failure is mainly demonstrated by a sudden-instability of small-scale fractures. Compared with the cumulative count method of the AE, the cumulative energy method is more suitable for determining crack initiation strength and damage strength of coal reservoirs.

利用裂缝体积应变法和声发射法分析了煤储层裂缝起裂强度，破坏强度，破坏模式和声发射特征的各向异性。结果表明，煤储层在抗压强度，开裂起始强度和破坏强度方面表现出明显的各向异性特征。煤层的抗压强度随层理角的增加而降低，但层间角为45°和90°的层抗压强度差异不大。裂纹萌生强度和破坏强度先随着层理角的增加而减小，然后增加。裂纹萌生强度和破坏强度最高，在0°的夹角下，在90°的夹角下适中，在45°的夹角下最低。当层理角为0°时，煤储层的破坏主要是大规模裂缝的稳定传播。当层理角为45°时，一种类型的破坏是由小规模裂缝的稳定传播引起的，另一种类型的破坏是由于大规模裂缝的突然失稳引起的。当层理角为90°时，破坏主要由小规模裂缝的突然失稳证明。与AE的累积计数法相比，累积能量法更适合于确定煤储层的裂缝起始强度和破坏强度。另一类故障是由于大规模裂缝的突然失稳造成的。当层理角为90°时，破坏主要由小规模裂缝的突然失稳证明。与AE的累积计数法相比，累积能量法更适合于确定煤储层的裂缝起始强度和破坏强度。另一类故障是由于大规模裂缝的突然失稳造成的。当层理角为90°时，破坏主要由小规模裂缝的突然失稳证明。与AE的累积计数法相比，累积能量法更适合于确定煤储层的裂缝起始强度和破坏强度。