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Applying Novel Micro–Nano-Siliceous Grouting Material Improves Mechanical Behaviors of Fractured Rock Masses and Microscopic Characteristics of Slurry–Rock Interface: Experimental and Numerical Simulation Investigations

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Abstract

During the underground excavation, various flaws are frequently observed, which significantly decrease the mechanical properties of surrounding rock, as has been proven. As known, grouting technology is a means of reinforcement that efficiently enhances the stability of underground engineering. However, existing studies have mainly focused on increasing the strength of the slurry stone, and relatively less attention has been paid to the poor bonding effect at the interface between the slurry and the rock mass. In this work, we proposed to adopt slurry containing nano-silica sol to reinforce the fractured rock mass. Based on the mechanical model of micro–nano-siliceous slurry reinforcement for single fractured rock masses established in this paper, the effect and the mechanism of micro–nano-siliceous slurry reinforcement for fractured rock were explored through theoretical analysis, laboratory tests, and numerical simulations. Results showed that the application of micro–nano-siliceous slurry increased the friction and the bonding force at the slurry–rock interface, which led to a (σn·Δμ + Δc) reduction of the effective stress. The optimum incorporation rate of the nano-silica sol was determined to be 3% based on these indicators including slurry fluidity, slurry stone rate, and strength and deformation parameters of slurry stone. The peak strength of the sandstone specimens reinforced by the micro–nano-siliceous slurry increased by 16.49% those of the sandstones reinforced by the ordinary slurry, and the elastic energy accumulated by the former was higher. Scanning electron microscope images revealed that the incorporation of nano-silica sol distinctly improved the pore characteristics of the slurry-rock interface. Finally, on the basis of 1790 ventilation roadway of Shiyakou coal mine, the effectiveness and the feasibility of micro–nano-siliceous slurry for reinforcing underground engineering surrounding rocks were verified using numerical simulation.

Highlights

  • This paper developed a new micro–nano-siliceous grouting material.

  • A mechanical model for fractured rock mass reinforced by new slurry was proposed.

  • The optimal incorporation rate of nano-silica sol was determined by various means.

  • This study demonstrated the effectiveness of the new grouting material in reinforcing fractured rock mass by control lab experiments and numerical simulation.

  • The mechanisms of micro–nano-siliceous slurry to improve slurry–rock interface were revealed.

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The data used to support the findings of this study are available from the corresponding author upon request.

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Acknowledgements

This study was supported by National Natural Science Foundation of China (52304145) and Shandong Provincial Natural Science Foundation (ZR2021QE233).

Funding

This study was funded by the National Natural Science Foundation of China (52304145) and Shandong Provincial Natural Science Foundation (ZR2021QE233).

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Authors and Affiliations

  1. College of Resources, Shandong University of Science and Technology, Tai’an, Shandong, 271001, People’s Republic of China

    Jin-Peng Zhang & Yang Li

  2. College of Water Conservancy and Civil Engineering, Shandong Agricultural University, Tai’an, Shandong, 271018, People’s Republic of China

    Jin-Peng Zhang, Chuan-Xiao Liu, Jun-Hao Xu & Jing-Ping He

  3. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, People’s Republic of China

    Ke-Sheng Li

  4. College of Communication Engineering, Taishan College of Science and Technology, Tai’an, Shandong, 271038, People’s Republic of China

    Yang Li

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  1. Jin-Peng Zhang
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  2. Ke-Sheng Li
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  3. Yang Li
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  4. Chuan-Xiao Liu
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Correspondence to Ke-Sheng Li.

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Zhang, JP., Li, KS., Li, Y. et al. Applying Novel Micro–Nano-Siliceous Grouting Material Improves Mechanical Behaviors of Fractured Rock Masses and Microscopic Characteristics of Slurry–Rock Interface: Experimental and Numerical Simulation Investigations. Rock Mech Rock Eng 57, 8297–8321 (2024). https://doi.org/10.1007/s00603-024-03924-4

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