Variable model for mechanical parameters of soft rock and elastoplastic solutions for tunnels considering the influence of confining pressure

Dong, Yucang; Zhang, Hai; Wang, Mingnian; Yu, Lan; Zhu, Yongquan

doi:10.3389/feart.2023.1143003

Cited by 4 publications

(2 citation statements)

References 22 publications

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“…To validate the accuracy of the improved numerical simulation method at the tunnel engineering scale, the stress and displacement fields of surrounding rock by the proposed numerical simulation method are compared with the elastoplastic solution from results [25]. To save the computing time and memory of FLAC 3D , only the elasticity modulus variation of the surrounding rock in the tunnel engineering example is considered.…”

Section: Tunnel Engineering Examplementioning

confidence: 99%

Numerical Simulation Method for Tunnel Excavation Considering Mechanical Characteristic Variation of Soft Rock with the Confining Pressure Influence

Dong

Zhang

Zhu³

et al. 2023

Applied Sciences

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The accurate prediction and evaluation of stress and displacement fields of surrounding rock is the fundamental premise for the deformation control of soft rock tunnels under high geo-stress condition. However, due to the complicated mechanical characteristics of soft rock with confining pressure influence, the current numerical simulation method usually regards the mechanical parameters of surrounding rock as constant and ignores the variation of these parameters in the simulation process, which leads to results that cannot accurately reflect the mechanical behavior of surrounding rock. Therefore, this paper firstly investigates the effect of confining pressure on deformation and strength parameters for soft rock and proposes corresponding variable models for mechanical parameters with the confining pressure influence. Secondly, a transversal loop discriminant update procedure is proposed and introduced into the iteration calculation process of FLAC3D, thus forming an improved numerical simulation method. This improved method can integrally consider the mechanical parameter variation of surrounding rock with variable confining pressure and realize the automatic update for such a parameter with its variable stress state. Finally, as an application example, an improved expression of longitudinal deformation profile (LDP) for tunnels considering the confining pressure influence is proposed based on numerous simulation results for a soft rock tunnel obtained by this proposed method.

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Section: Tunnel Engineering Examplementioning

confidence: 99%

Numerical Simulation Method for Tunnel Excavation Considering Mechanical Characteristic Variation of Soft Rock with the Confining Pressure Influence

Dong

Zhang

Zhu³

et al. 2023

Applied Sciences

Self Cite

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“…With a thorough understanding and study of the rheological properties of soft rocks like mudstone, shale, sandstone, and phyllite, their behavior can be better predicted and managed. This enables more effective planning and design in constructing tunnels or underground structures, thereby ensuring their long-term stability and safety [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

The Secondary Development and Application of the Improved Nishihara Creep Model in Soft Rock Tunnels

Deng,

Shi,

et al. 2023

Buildings

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Given the complexity and diversity of rock formations, existing constitutive models struggle to accurately portray their mechanical properties, leading to substantial discrepancies between numerical simulation outcomes and reality. This inadequacy fails to meet the demands of numerical analysis in practical engineering. This study first analyzes the physical and mechanical properties of thin-layered carbonaceous phyllite. Subsequently, an improved Nishihara rheological constitutive model is established based on these analyses. Utilizing the secondary development function offered by FLAC3D, the proposed model is further developed. The program’s correctness and reliability are confirmed through a numerical simulation using the triaxial creep test from existing research. Finally, the established constitutive model is applied in the numerical simulation of an actual soft rock tunnel engineering, obtaining results compared to real monitoring data. The results demonstrate that the improved Nishihara model is more effective at describing the creep deformation characteristics of soft rock. Moreover, the findings from this study can serve as a theoretical reference for predicting deformation in soft rock tunnel engineering.

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Study on mechanical characteristics of phyllite by conventional triaxial compression under multi-factors coupling action

Wu,

Yang

2024

Sci Rep

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Variable model for mechanical parameters of soft rock and elastoplastic solutions for tunnels considering the influence of confining pressure

Cited by 4 publications

References 22 publications

Numerical Simulation Method for Tunnel Excavation Considering Mechanical Characteristic Variation of Soft Rock with the Confining Pressure Influence

Numerical Simulation Method for Tunnel Excavation Considering Mechanical Characteristic Variation of Soft Rock with the Confining Pressure Influence

The Secondary Development and Application of the Improved Nishihara Creep Model in Soft Rock Tunnels

Study on mechanical characteristics of phyllite by conventional triaxial compression under multi-factors coupling action

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