Abstract
To study the stability evaluation method and failure mode of reserved rock masses, the Yueyang landslide project was taken as the research object. First, based on the limit equilibrium method and elastic mechanics, the formulas for calculating the stability of a reserved rock mass were analyzed. Second, the failure modes of the reserved rock mass were tested by the experiment model. The results show that the failure modes of the reserved rock mass can be divided into three modes: upward sliding failure, downward sliding failure and tensile crack failure, which are mainly related to the strength and width of the reserved rock mass. Therefore, it is unreasonable to regard a reserved rock mass as a unified failure form in the design of anti-slide pile reinforcement. In addition, although both moderate-strength and strong-strength reserved rock masses exhibit tensile crack failure, moderate-strength rock masses under triangular loading are prone to tension-sliding failure, while strong-strength rock masses under parabolic loading are prone to tension-overturning failure. Finally, the displacement and stress monitoring results in the experiment are basically consistent with the theoretical analysis, indicating that the theoretical analysis results have high reliability.
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Abbreviations
- a :
-
Action height of the triangle load
- a 1, a 2, a 3 :
-
Coefficient of the parabolic load function
- B :
-
Angle between the slide surface and anti-slide pile (≤90°)
- B :
-
Width of the reserved rock mass in front of the anti-slide pile
- B :
-
Width of the anti-slide pile
- B p :
-
Influence width of the anti-slide pile
- B pa :
-
Critical width of reserved rock mass at parabolic load
- B tr :
-
Critical width of the reserved rock mass at triangular load
- c :
-
Cohesion of the reserved rock mass
- F s :
-
Factor of safety
- F s1 :
-
Driving force
- F s2 :
-
Resisting force
- F 1 :
-
Friction force between the anti-slide pile and reserved rock mass
- F 2, F 3 :
-
Lateral shearing force on the sliding wedge
- H :
-
Height of the reserved rock mass in front of the anti-slide pile
- h :
-
Plastic zone height
- γ :
-
Unit weight of the reserved rock mass
- δ :
-
Friction angle between the anti-slide pile and reserved rock mass
- λ 1, λ 2, λ 3, λ 4 :
-
Assumed parameters
- [σ R]:
-
Compressive strength of the reserved rock mass
- [σ τ]:
-
Tensile strength of the reserved rock mass
- σ x, σ x, τ xy :
-
Stress of the reserve rock mass
- ϕ :
-
Internal friction angle of the reserved rock mass
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant Number 41302256) and the Open Fund of Key Laboratory of Geological Hazards on Three Gorges Reservoir Area (China Three Gorges University), Ministry of Education (Grant Number 2020KDZ06).
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Zhu, D., He, L. & Qin, L. Stability of the Rock Mass Reserved in front of Anti-slide Piles. KSCE J Civ Eng 26, 569–583 (2022). https://doi.org/10.1007/s12205-021-0315-3
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DOI: https://doi.org/10.1007/s12205-021-0315-3