Mechanical Stability of Underground Rock Structures

Mechanical stability of underground rock structures hinges on the interplay between geological discontinuities, in situ stresses and engineered supports. Central concerns include the propagation of fractures, deformation of rock masses under varying loads and the evolution of damage over time. Discontinuity networks—joints, faults and bedding planes—govern the strength and deformability of the mass and often dictate the preferred failure modes. Hydro-mechanical coupling further complicates stability, as fluid pressures within fissures can reduce effective stresses and trigger progressive fracturing. Seismic and dynamic loads, whether induced by blasts, mining operations or natural earthquakes, can accelerate damage accumulation, alter wave propagation characteristics and compromise support systems. Contemporary research emphasises advanced numerical modelling—particularly finite-element and discrete-element methods—to simulate complex stress paths, chemical weathering effects and time-dependent deformations. Field investigations, laboratory testing and in situ monitoring jointly inform the calibration of constitutive models and optimisation of support design. The outcome is a multi-scale understanding of how rock mass properties, excavation geometry and environmental factors converge to determine long-term performance, safety margins and the necessity for remedial interventions.

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Mechanical Stability of Underground Rock Structures publication trend

The graph below shows the total number of articles in mechanical stability of underground rock structures across all publications each year (not limited to Nature Index journals).

Technical terms

Discontinuity: A plane of weakness in rock mass such as a joint, fault or bedding plane that influences strength and deformation.

Finite-element analysis (FEA): A numerical method that subdivides a domain into discrete elements to simulate stress, strain and displacement under load.

Rock Mass Rating (RMR): A system that classifies rock quality and strength based on parameters such as intact rock strength, discontinuity spacing and groundwater conditions.

Wave impedance: The product of rock density and wave velocity, governing transmission and reflection of stress waves at material interfaces.

Plastic failure: Irreversible deformation of rock when stresses exceed the yield criterion of the constitutive model.

References

1. Study of Impact Dynamic Characteristics and Damage Morphology of Layered Rock Mass. Geofluids (2022).
2. Dynamic Behaviour of Abandoned Underground Mines: Insights from Numerical Simulations. Rock Mechanics and Rock Engineering (2022).
3. Stability charts based on the finite element method for underground cavities in soft carbonate rocks: validation through case-study applications. Natural Hazards and Earth System Science (2019).