Abstract
Aiming at roadway rockbursts induced by near-field dynamic disturbances, this study explored the mechanical response and failure mechanism of anchored roadway surrounding rocks under this condition through the similarity simulation experiment and theoretical modeling analysis. Results show that the greater the disturbance energy is, the stronger mechanical response of surrounding rocks while the faster its attenuation. The starting acceleration amplitude is relatively smaller while the braking acceleration amplitude is larger in the bolt densification area, which has a better self-stabilizing ability. Anchored roadway surrounding rocks exhibit local impact failure characteristics, and the region facing disturbance is most seriously damaged. The bolt-mesh-cable support structure shows the good resistance to low-energy disturbances, while the impact failure is induced with damages inside support structure increasing abruptly under high-energy disturbances. The impact resistance of local surrounding rocks can be improved by bolt densification. Based on the failure criterion, the surrounding rocks only undergo impact failure in the region facing disturbance, while quasi-static failure occurs in remaining regions. The experimental and theoretical research results have been verified through in-situ measurements, which can provide an important reference for the mechanism and prevention of roadway rockburst under near-field dynamic disturbance.
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Abbreviations
- A 1, B 1, A 2, B 2 :
-
Coefficients of fitting formulas for acceleration and deformation
- a, a m :
-
Acceleration, peak starting acceleration (m/s2)
- c :
-
Cohesion of surrounding rock (MPa)
- C l, C ρ, C σ, C E :
-
Similarity ratios of dimension, density, stress and energy
- E :
-
Elastic modulus (GPa)
- g :
-
Gravitational acceleration (N/kg)
- H :
-
Burial depth of roadway (m)
- h :
-
Actual burial depth for top surface of experimental model (m)
- J 1, J 2, J 2, J 4 :
-
Coefficients of fitting formulas for ξ(θ)
- K :
-
Arch cross-section correction coefficient
- L :
-
Distance from the dynamic disturbance source to roadway center (m)
- N :
-
Actual anchoring force after the rockburst
- N 0 :
-
Design anchoring force
- n b, n c :
-
Numbers of bolts and anchor cables
- P :
-
Compensatory stress applied on top surface of experimental model (MPa)
- p s :
-
Supporting resistance (MPa)
- Q b, Q c :
-
Maximum axial forces of a single bolt and anchor cable (kN)
- r :
-
Distance from any point to the roadway center (m)
- R 0, R p :
-
Roadway radius, radius of plastic zone (m)
- S :
-
Actual cross-sectional area of roadway (m2)
- s, s m :
-
Deformation, peak deformation (m)
- t :
-
time (s)
- U b, U c :
-
Maximum absorbed energies of a single bolt and anchor cable (J)
- U d :
-
Dynamic disturbance energy on roadway surrounding rocks (J)
- U d0 :
-
Initial energy of near-field dynamic disturbance source (J)
- U e :
-
Elastic energy accumulated in elastic zone under static loading (J)
- U min :
-
Minimum energy consumed by dynamic failure in elastic zone (J)
- U r :
-
Residual elastic energy after failure of elastic zone (J)
- U s :
-
Absorbed energy of support structure during the failure process (J)
- δ :
-
Loss ratio of anchoring force
- γ :
-
Volume weight of overlaying strata (N/m3)
- η :
-
Energy attenuation coefficient
- ϕ :
-
Internal friction angle of surrounding rock (°)
- λ :
-
Lateral pressure coefficient
- μ :
-
Poisson’s ratio
- θ :
-
Angle between any point and positive direction of x axis (°)
- ρ :
-
Practical density of overlying rock strata (kg/m3)
- ρ b, ρ c :
-
Anchoring densities of bolts and cables (number/m2)
- σ 0 :
-
Original rock stress (MPa)
- σ 1, σ 2, σ 3 :
-
Maximum, intermediate and minimum principal stresses (MPa)
- σ dc :
-
Dynamic uniaxial compressive strength of coal-rock mass (MPa)
- σ θs, σ zs, σ rs :
-
Circumferential stress, axial stress, and radial stress (MPa)
- ξ(θ):
-
Weakening coefficient of roadway space on stress wave strength
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant No. 51634001, 51874292), and Changzhou Sci &Tech Program (Grant No. CJ20235078).
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Wang, Z., Dou, L., Wang, G. et al. Failure Mechanism of Anchored Roadway Surrounding Rocks under Near-Field Dynamic Disturbance. KSCE J Civ Eng (2024). https://doi.org/10.1007/s12205-024-1813-x
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DOI: https://doi.org/10.1007/s12205-024-1813-x