Mechanical Properties of Columnar Jointed Rock Masses
Summary
Columnar jointed rock masses are distinguished by their natural polygonal fracture networks, typically formed during the cooling of basaltic lava. Their characteristic prismatic columns confer strong anisotropy in strength, stiffness and permeability. Mechanical behaviour is governed by column geometry, joint spacing, irregularity and boundary conditions. Under uniaxial or triaxial loading, these rock masses exhibit size-dependent strength, non-linear deformation and complex failure modes that range from column-boundary fractures to transverse shear along joint planes. Lateral confining pressures significantly modify peak strength and post-peak residual capacity. Advances in numerical modelling, employing statistical damage theory, continuum and discrete element methods, together with digital image correlation, have elucidated the influence of mesoscopic heterogeneity and irregular joint patterns on fracture initiation, propagation and acoustic emission. These insights underpin engineering design for dams, tunnels and slopes where stability, seepage control and support measures must account for anisotropy, scale effects and energy dissipation during progressive failure.
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Mechanical Properties of Columnar Jointed Rock Masses publication trend
The graph below shows the total number of articles in mechanical properties of columnar jointed rock masses across all publications each year (not limited to Nature Index journals).
Technical terms
Anisotropy: Variation of mechanical or physical properties with direction within a material.
Columnar joints: Polygonal prismatic fractures in volcanic rock formed by cooling contraction.
Deformation modulus: Ratio of stress change to corresponding strain change in the elastic or non-linear regime.
Lateral pressure: Confining stress applied perpendicular to the primary loading direction.
Digital image correlation (DIC): Optical technique that tracks surface displacements and strains by comparing digital images during loading.
Acoustic emission (AE): Transient elastic waves generated by rapid release of energy during crack propagation.
References
- Size effect and lateral pressure effect on the mechanical resistance of columnar jointed basalt. International Journal of Rock Mechanics and Mining Sciences (2023).
- Numerical Investigation on Anisotropy and Shape Effect of Mechanical Properties of Columnar Jointed Basalts Containing Transverse Joints. Rock Mechanics and Rock Engineering (2022).
- AE energy evolution during CJB fracture affected by rock heterogeneity and column irregularity under lateral pressure. Geomatics Natural Hazards and Risk (2022).
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