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Abstract In order to study the crack evolution characteristics of cemented tailings backfill under uniaxial compression. The electronic universal testing machine，acoustic emission(AE)，scanning electron microscope (SEM) and DIC technology were used to conduct damage tests on cemented backfill under uniaxial loading. The multi-scale evolution process of cemented backfill from micro-crack initiation，expansion and coalescence to macro-crack generation was investigated. The results show that：(1) The damage mode of the specimen during uniaxial compression is ductile damage，and the crack penetration is in the form of shear penetration. (2) The micro-cracks and pores in the cemented filling body are scattered and randomly distributed. The internal morphology is mostly in the form of blocks，clusters and sheet networks. The internal structure is compact and has good integrity. (3) Crack expansion of samples present as tension crack at the beginning of loading and later as shear crack. The two act together to produce macroscopic primary and secondary cracks. Eventually，the connection between cracks leads to the destruction of the specimen. (4) The strain variation at different monitoring points at the same moment is related to their position in the specimen space. The closer to the lower end of the specimen，the greater the strain and the greater the strain change. The existence of a critical damage region for the specimen makes the difference between elastic and plastic strains and strain increase obvious.
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WANG Hongjian1, 2, 3, 4, YIN Bohao1, WANG Yongbo1, XU Xianlei4, ZHAO Shankun3*, ZHAO Fei1,SHI Xiaoshan2, WANG Guozhu5. Fluid-solid coupling mechanisms in the evolution of hydraulic fracture networks in large-scale true triaxial tight sandstone[J]. , 2026, 45(6): 1723-1739. |
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