Acoustic emission and digital image correlation were used to study the spatiotemporal evolution characteristics of crack extension of soft and hard composite laminated rock masses (SHCLRM) containing double fissures under uniaxial compression. The effects of different rock combination methods and prefabricated fissures with different orientations on mechanical properties and crack coalescence patterns were analyzed. The characteristics of the acoustic emission source location distribution, and frequency changes of the crack evolution process were also investigated. The test results show that the damage mode of SHCLRM is related to the combination mode of rock layers and the orientation of fractures. Hard layers predominantly produce tensile cracks; soft layers produce shear cracks. The first crack always sprouts at the tip or middle of prefabricated fractures in hard layers. The acoustic emission signal of SHCLRM with double fractures has clear stage characteristics, and the state of crack development can be inferred from this signal to provide early warning for rock fracture instability. This study can provide a reference for the assessment of the fracture development status between adjacent roadways in SHCLRM in underground mines, as well as in roadway layout and support.

利用声发射和数字图像相关性研究了单轴压缩下含双裂隙的软硬复合层状岩体(SHCLRM)裂纹扩展的时空演化特征。分析了不同岩石组合方法和不同方向的预制裂缝对力学性能和裂缝合并模式的影响。还研究了声发射源位置分布特征和裂纹演化过程的频率变化。试验结果表明，SHCLRM的损伤模式与岩层组合方式和裂缝方向有关。硬层主要产生拉伸裂纹；软层会产生剪切裂纹。第一个裂缝总是在硬层预制裂缝的尖端或中间萌芽。双裂缝SHCLRM声发射信号具有明显的阶段特征，可以根据该信号推断裂缝发育状态，为岩石破裂失稳提供预警。该研究可为地下矿山SHCLRM相邻巷道间裂缝发育状况的评估以及巷道布置与支护提供参考。