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Synthesize core geomechanical principles for underground rockbolting design, focusing on stress regimes, bolt dimensioning, and support compatibility.

May 3, 2017Journal of Rock Mechanics and Geotechnical EngineeringOpen Access

Principles of rockbolting design

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Synthesize core geomechanical principles for underground rockbolting design, focusing on stress regimes, bolt dimensioning, and support compatibility.
Evaluated rock mass loading conditions and the formation of natural versus artificial pressure arches around underground openings.
Assessed design criteria including rockbolt type selection, bolt length, spacing, safety factors, and displacement capacities across low and high in situ stress settings.
Energy-absorbing rockbolts are required under high in situ stresses to manage rock deformation, whereas standard high-strength rockbolts are suitable only under low in situ stresses.
Effective anchorage requires rockbolts to extend at least 1 m beyond the failure zone into the natural pressure arch, while extensive failure zones necessitate tightly spaced short bolts combined with deep cable anchors.
Support design depends on coordinating bolt spacing, allowable tunnel displacement, and deformation compatibility across all interacting support elements.

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Implication

Engineering review demonstrates rockbolt dimensioning and selection principles across underground excavations, highlighting the necessity of displacement compatibility and pressure arch anchorage.

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Charlie C. Li (2017) studied this question.

synapsesocial.com/papers/6a7c342e66fdf7440826adbf https://doi.org/10.1016/j.jrmge.2017.04.002

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Implication

Engineering review demonstrates rockbolt dimensioning and selection principles across underground excavations, highlighting the necessity of displacement compatibility and pressure arch anchorage.

Principles of rockbolting design

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Principles of rockbolting design

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