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<p>The autogenous shrinkage of ordinary cement slurry (OCS) may prevent the fracture space from being densely filled when reinforcing rock masses. Therefore, it is considered to use an expansive cement slurry (ECS) that can produce compressive bonding effect due to its own volume expansion to improve this deficiency. Biaxial compression tests were conducted on single-fractured specimens reinforced with OCS and ECS under different confining pressures. Acoustic emission (AE) and 3D digital image correlation (DICM) techniques were employed to monitor the deformation and damage characteristics of reinforced specimens, and the reinforcement effects of two types of slurries were analyzed and discussed. The results indicate that ECS effectively compensates for the dry shrinkage of OCS, resulting in denser filling of the fracture space after grouting. ECS not only resists the normal stress on the fracture surface of the specimen but also reduces the effective shear stress on the original fracture surface, thereby delaying the tendency of shear slip evolution along the bonding interface and suppressing the propagation of wing cracks at the tips. ECS demonstrates superior repair functionality for fracture surfaces, and under high confining pressure conditions, the failure direction of the reinforced specimen changes. The strength of ECS-grouted specimens increased by 3% to 12% compared to OCS, and the overall reinforcement effect was superior to that of OCS. This study provides a new approach for grouting reinforcement engineering in fractured rock masses.</p>

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Effect and mechanism of grouting reinforcement with expansive slurry in fractured rock mass

  • 期刊论文

  • 发表日期：

    2026年3月30日

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  • Mingchao Wan,
  • Nan Yao,
  • Binyu Luo,
  • Ruzi Yang,
  • Yicheng Ye

摘要

The autogenous shrinkage of ordinary cement slurry (OCS) may prevent the fracture space from being densely filled when reinforcing rock masses. Therefore, it is considered to use an expansive cement slurry (ECS) that can produce compressive bonding effect due to its own volume expansion to improve this deficiency. Biaxial compression tests were conducted on single-fractured specimens reinforced with OCS and ECS under different confining pressures. Acoustic emission (AE) and 3D digital image correlation (DICM) techniques were employed to monitor the deformation and damage characteristics of reinforced specimens, and the reinforcement effects of two types of slurries were analyzed and discussed. The results indicate that ECS effectively compensates for the dry shrinkage of OCS, resulting in denser filling of the fracture space after grouting. ECS not only resists the normal stress on the fracture surface of the specimen but also reduces the effective shear stress on the original fracture surface, thereby delaying the tendency of shear slip evolution along the bonding interface and suppressing the propagation of wing cracks at the tips. ECS demonstrates superior repair functionality for fracture surfaces, and under high confining pressure conditions, the failure direction of the reinforced specimen changes. The strength of ECS-grouted specimens increased by 3% to 12% compared to OCS, and the overall reinforcement effect was superior to that of OCS. This study provides a new approach for grouting reinforcement engineering in fractured rock masses.