An insight from energy index characterization to determine the proneness of rockburst for hard rock

Du, Kun; Luo, Xinyao; Yang, Songge; Danial, J. A.; Zhou, Jian

doi:10.1016/j.gete.2023.100478

Cited by 6 publications

(2 citation statements)

References 30 publications

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“…Another approach is to use burst liability theories majority of which assume the bursting of rock is dependent on the inherent properties of rock and hence fail to consider the role of the in-situ stress state. [36][37][38] Further summary of rock burst assessment attempts made can be accessed in refs. 35, 37. In addition, numerical modelling approaches based on discrete element methods seem to be underutilised in assessing theoretical criteria for rock burst, although they can provide better access to the rock's mechanical response, along with the flexibility to vary the specimen dimension and loading conditions.…”

Section: Introductionmentioning

confidence: 99%

A size‐dependent energy‐based strain burst criterion

Verma,

Nguyen,

Karakus

et al. 2024

Num Anal Meth Geomechanics

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This paper presents a size‐dependent energy‐based strain burst criterion linking strength, elasticity, fracture energies and specimen size effect with stress state due to changes in boundary conditions. It proposes the concept of a ‘Burst Envelope’, a surface in three‐dimensional principal stress space derived based on energy storing and dissipation characteristics of a rock sample, taking into account the size of the specimen and potential localised failure pattern. A scalar burst index is also proposed to quantify the bursting scale. To illustrate and verify its functioning, a numerical modelling framework based on the distinct element method and employing a new cohesive‐frictional contact model is used to perform virtual strain burst experiments under different polyaxial loading‐unloading scenarios, mimicking various underground excavation scenarios. The obtained results are in good agreement with the theoretical prediction of burst occurrence. On that basis, the variation of burst possibility and magnitude are investigated with key factors, including confinement level and the material's elastic, strength and fracture properties. The effect of the specimen's aspect ratio and size on the rock burst potential is elaborated and verified using virtual strain burst experiments, facilitating the linking of the proposed theoretical framework with the evaluation of in‐situ strain bursts in rock masses around underground openings.

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Section: Introductionmentioning

confidence: 99%

A size‐dependent energy‐based strain burst criterion

Verma,

Nguyen,

Karakus

et al. 2024

Num Anal Meth Geomechanics

View full text Add to dashboard Cite

show abstract

“…Gong et al [24] found that unloading confining pressure does not affect the rock failure mode but induces a strength reduction effect in the rock. By conducting uniaxial compression tests on granite and red sandstone, Du et al [25] clarified the correlations among the hard rock energy, the energy storage coefficient corresponding to peak-strength strain, and the residual elastic energy index. He et al [26] investigated the energy evolution laws of sandstone and granite from both macroscopic and microscopic perspectives based on multistage cyclic loading.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Tunnel Bottom Deformation Trend in Gently Inclined Layered Shale Based on the Energy Index

Chen,

Tan,

Deng

et al. 2023

Materials

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Influenced by the anisotropy and water-softening characteristics of gently inclined layered shale, many tunnels have encountered bottom deformation issues during construction and operation, which severely impact the safety of tunnel structures. The energy evolution law during rock deformation and damage can provide support for the assessment and prediction of structure deformation. However, most studies have been conducted on enstatite, granite, and sandstone with limited research on shale. In this study, both conventional and single-cyclic loading-and-unloading uniaxial compression tests were conducted on shale specimens with varying dip angles of the structural plane (Dφ) and water content (Wc) in addressing the most typical layered shale in the Chaoyang Tunnel. The energy evolution features of rock samples at each stage of the tests were analyzed to determine the discriminating indicator (SC) for tunnel bottom deformation tendency. The indicator was based on the elastic strain energy (Uei) and the post-peak dissipation energy (Udi). The results demonstrated that the Dφ and Wc directly affected the energy storage and dissipation process of rock specimens, which in turn enabled them to exhibit different damage evolution features. The Uei and the total input energy (Uli) satisfied a linear relationship, which was determined by the Dφ and Wc of rock specimens. The energy evolution-based indicator SC can accurately characterize the bottom deformation of the tunnel constructed in a gently inclined layered shale stratum. The findings can offer a scientific foundation for rational evaluation of the structure deformation of tunnels under construction.

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Toward Precise Long-Term Rockburst Forecasting: A Fusion of SVM and Cutting-Edge Meta-heuristic Algorithms

Armaghani,

Yang,

et al. 2024

Nat Resour Res

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An insight from energy index characterization to determine the proneness of rockburst for hard rock

Cited by 6 publications

References 30 publications

A size‐dependent energy‐based strain burst criterion

A size‐dependent energy‐based strain burst criterion

Experimental Study on Tunnel Bottom Deformation Trend in Gently Inclined Layered Shale Based on the Energy Index

Toward Precise Long-Term Rockburst Forecasting: A Fusion of SVM and Cutting-Edge Meta-heuristic Algorithms

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