Large Deformation Mechanism of Foliated Rock and NPR Anchor Cable Support Technology in the Changning Tunnel: A Case Study

Sun, Xiaoming; Zhang, Bo; Yang, Kang; Guo, Pengfei; Tao, Zhigang

doi:10.1007/s00603-022-03010-7

Cited by 31 publications

(14 citation statements)

References 40 publications

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“…This means that a certain minimum stress level must be exceeded for rheological deformation to occur within the rock mass. 20 Fan et al research confirmed the existence of an initial creep stress threshold, which linearly increases with increasing confining pressure during oil mudstone creep tests. 21 Zheng et al analyzed uniaxial, conventional triaxial and true triaxial creep test results, the crack initiation stress is taken as the starting point of creep and the timedependent characteristics of rock under untested true triaxial stress levels were predicted.…”

Section: Introductionmentioning

confidence: 88%

“…[41][42][43] However, the existing model inadequately addresses rocks that do not exhibit creep deformation under initial creep stress, a natural occurrence that aligns with the inherent objective law. 20,21 Building upon this foundation, the author enhanced the BVS model by incorporating the initial creep stress of rock to describe scenarios in which such stress does not exceed the threshold for creep deformation. This modification resulted in a new constitutive model, complete with a numerical implementation compatible with FLAC 3D , thereby producing more realistic and comprehensive simulation results.…”

Section: Introductionmentioning

confidence: 99%

“…Sun and Pan identified a “lower rheological limit” in rock mass during rheological testing. This means that a certain minimum stress level must be exceeded for rheological deformation to occur within the rock mass 20 …”

Section: Introductionmentioning

confidence: 99%

“…However, the existing model inadequately addresses rocks that do not exhibit creep deformation under initial creep stress, a natural occurrence that aligns with the inherent objective law 20,21 . Building upon this foundation, the author enhanced the BVS model by incorporating the initial creep stress of rock to describe scenarios in which such stress does not exceed the threshold for creep deformation.…”

Section: Introductionmentioning

confidence: 99%

“…Based on the phenomenon of initial creep stress found in rock creep experiments, 20,21,44,45 we takes it into account for the first time to improve the BVS model, and the engineering verification is carried out. So that the stress calculation in numerical simulation is more like a natural occurrence.…”

Section: Introductionmentioning

confidence: 99%

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A viscoelastic–plastic constitutive model incorporating creep initiation stress for surrounding rock in deep roadways and its practical application

Kang,

Gong,

et al. 2024

Energy Science & Engineering

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With the increasing depth of engineering in rock masses, the issue of significant rheological deformation becomes notably prominent. To accurately characterize the deformation and failure behavior of the surrounding rock near the goaf in deep small coal pillars, we have developed a viscoelastic–plastic constitutive model that takes into account the initial stress associated with creep. This model builds upon an existing viscoelastic–plastic constitutive framework and is implemented numerically using C++ in the FLAC3D. The Oedometer test method is used to check the creep components and the calculated parameter (η/G) ensure convergence of numerical operations. We conducted both pre‐improvement and post‐improvement tests of the constitutive model in a simple numerical analysis of roadways. The enhanced model demonstrates improved accuracy in deviational stress calculations and proves suitable for modeling deep, soft roadways. Furthermore, we applied the improved model to simulate actual working conditions at Zhaozhuang Mine, where mining operations near the working face induce a fracture zone of approximately 3 m in the small coal pillar located at the goaf's edge. The new model closely aligns with the observed results, further validating its suitability for tunneling along the goaf. Tunneling and mining activities result in significant deformation at various locations, including the shoulder socket of the working face, the top angle of the coal pillar, and the bottom angle of the floor. The crushing zone at the working face extends up to 4 m. Rheological effects transform the triangular elastic core, from its original high‐pressure elastic state to a fracture and plastic zone in the deep coal. Stress in deep coal is transmitted along the triangular elastic core. Numerical simulation results closely match the excavation profile of the tunneling, providing valuable insights into the impact of mining activities. This study can provide reference for deformation of similar geological conditions and engineering situation.

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Section: Introductionmentioning

confidence: 88%