Abstract
Expansive slurry has attracted more and more attention because it can compensate for the reduction of the grouting reinforcement effect caused by dry shrinkage of cement, but the reinforcement mechanism of expansive slurry is still incompletely understood. To study the grouting reinforcement mechanism of expansive slurry, both direct shear tests and numerical tests were carried out for the slurry-fractured rock mass composite. The results show that the expansive slurry grouting reinforcement has a remarkable shear strength increase of 30.53% than the ordinary slurry. The expansion stress and the normal stress increased the friction at the interface, which also improve the ability of the expansive slurry-fractured rock mass composite interface to resist deformation and reduce the tensile failure area on the surface of the composite. During the shear test, the expansion stress can be regarded as the increase of normal stress, which changed the stress distribution inside the composite, reduced the porosity of the expansive slurry near the interface, and increased the friction against the failure of the composite and the internal friction angle at the slurry-rock interface. These promote an increase in shear strength and improve the grouting effect. The investigation of the grouting reinforcement mechanism of expansive slurry provides a technical approach for the application of grouting reinforcement and support in underground engineering.
Highlights
-
Both the direct shear tests and numerical tests show that expansive slurry can effectively strengthen the single fractured rock mass.
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DIC technology and numerical method were used to present the failure evolution process of grouting the single fractured rock mass, indicating that the failure mode is dominated by tensile failure.
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The grouting reinforcement mechanism of the single fractured rock mass was revealed using the Mohr–Coulomb criterion.
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Data availability statement
The datasets used and analyzed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- ESFC:
-
The expansive slurry-fractured rock mass composite
- OSFC:
-
The ordinary slurry-fractured rock mass composite
- DIC:
-
Digital image correlation
- UCS:
-
Uniaxial compressive strength (MPa)
- I:
-
The compaction stage
- II:
-
The linear stage
- III:
-
The stress drop stage (ESFC) or plastic stage (OSFC)
- IV:
-
The strain softening stage
- F :
-
The tangential force (N)
- T :
-
The compressive force (N)
- \(\sigma_{\text{n}}\) :
-
The normal stress (MPa)
- N :
-
The reaction force of expansion force (N)
- C :
-
The bonding force (N)
- f :
-
The friction force (N)
- Δf :
-
The increased friction force (N)
- \(\tau\) :
-
The shear strength (MPa)
- \(\varphi\) :
-
The internal friction angle (°)
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Acknowledgements
The authors wish to acknowledge the support from the National Natural Science Foundation of China (no. 51804224 and 51574183), the key R & D Projects in Hubei Province (no.2020BCA082).
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Yao, N., Zhang, W., Luo, B. et al. Exploring on Grouting Reinforcement Mechanism of Expansive Slurry. Rock Mech Rock Eng 56, 4613–4627 (2023). https://doi.org/10.1007/s00603-023-03301-7
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DOI: https://doi.org/10.1007/s00603-023-03301-7