Numerical modelling of stress analysis around rectangular tunnels with large discontinuities (fault) by a hybridized indirect BEM

Nikadat, Nooraddin; Fatehi, Mohammad; Abdollahipour, Abolfazl

doi:10.1007/s11771-015-2977-9

Cited by 20 publications

(4 citation statements)

References 11 publications

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“…Tunnels serve as crucial transportation routes for navigating through mountains and challenging geological conditions. The behaviour of these structures is markedly influenced by the characteristics of the rock mass and the presence of discontinuities [1]. The behaviour of jointed rock masses frequently holds a key role in the design of underground excavations, and failures during both the excavation and operational phases are typically closely associated with the presence of joints [2].…”

Section: Introductionmentioning

confidence: 99%

Enhancing tunnel stability in the Himalayas: Empirical design support through numerical modelling

Abbas,

Li,

Emad

et al. 2024

The Journal of Engineering

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This study focuses on assessing the effectiveness of an empirically recommended support design through numerical modelling. Numerical techniques are utilized to accurately evaluate tunnel stability under various geological conditions. Numerical analysis is conducted on two different rock types along the tunnel route, employing the recommended support design based on the existing rock mass rating (RMR) and Q‐system. Furthermore, support recommendations are made using the modified RMR and Q‐system, considering the impact of stress. The numerical analysis indicates that the support recommended by the existing RMR may not substantially impact the total displacement and vertical stresses around the tunnel crown in the “Fair” to “Poor” rock mass of the study area. However, extending the bolt length by modifying the RMR to incorporate stress effects results in a reduction of total displacement and vertical stresses, ultimately achieving a stable level. These results underline the importance of considering stress effects and utilizing modified support designs to enhance tunnel stability.

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Section: Introductionmentioning

confidence: 99%

Enhancing tunnel stability in the Himalayas: Empirical design support through numerical modelling

Abbas,

Li,

Emad

et al. 2024

The Journal of Engineering

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“…Li et al [13] quantitatively revealed the internal relationship and mechanical mechanism between mining disturbance and energy release of mine earthquakes. Nooraddin Nikadat et al [14] investigated the stress distribution around the tunnels excavated in jointed rock masses by a fictitious stress displacement discontinuity method. Characteristic of reproducing fault activation process with the experimental design of coal seam mining stress path, Hu [15] explained the force-sound-deformation evolution law of the fault activation process under the disturbed stress path of coal seam mining.…”

Section: Introductionmentioning

confidence: 99%

Evolution Laws of Stress–Energy and Progressive Damage Mechanisms of Surrounding Rock Induced by Mining Disturbance

Bai

et al. 2023

Applied Sciences

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The rock burst induced by the mutual disturbance of mining and excavation is significantly influenced by high static load stress and external dynamic load disturbance. In this paper, the evolution characteristics and progressive damage mechanism of surrounding rock in the process of mutual disturbance of mining and excavation are systematically studied. The results show that the evolution of surrounding rock stress can be roughly divided into three stages: rapid rise in the early stage, continuous rise and step-like decline in the middle stage, and slow rise in the late stage. In the process of parallel mining, the overlying rock movement above the goaf shows the sequence of horizontal penetration of tiny fissures—fracture intensification transition to stratification—non-coordinated caving of middle–low overlying rock—obvious horizontal cracks in the upper key layer. Only under the quasi-static loading mining action does the upper key layer not reach the breaking condition. The wave side of the heading face which is close to the focal point is affected by the dynamic load disturbance, the acceleration duration is short, and the attenuation is relatively fast, so it is the area prone to the earliest impact failure in the face of mining disturbance. The conclusion is helpful to deepen the understanding of the coal burst mechanism of mutual disturbance of mining and excavation.

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“…It provides a systematic and proactive approach to ensuring the stability and safety of underground excavations [29,30]. In recent years, many scholars have proposed related numerical simulation research, such as the hybridized FSM and DDM stress analysis of the discontinuous surrounding rock of the tunnel, the mixed indirect boundary element method, and the numerical simulation of rock failure analysis in the crushing zone [31][32][33].…”

Section: Introductionmentioning

confidence: 99%

An Improved Incremental Procedure for the Ground Reaction Based on Hoek-Brown Failure Criterion in the Tunnel Convergence-Confinement Method

Lee

2023

Mathematics

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The purpose of this study is to introduce the Hoek–Brown nonlinear failure criterion into the convergence–confinement method (CCM), which is based on the linear failure criterion, and implant it into the ground reaction curve (GRC) in this theory. Based on consistent and rigorous theoretical analysis and according to the mechanical relationships, the principle of equilibrium, the material constitutive law, and the strain/displacement compatibility equation are used to deduce the closed-form analytical solution of the stress/displacement of the rock mass in the plastic region and to complete the simulation and interpretation of the nonlinear behavior of surrounding rock due to the advancing excavation of a circular tunnel. In this paper, confinement loss is regarded as the concept of increment in numerical analysis, and the calculation process and analysis steps of the explicit analysis method (EAM) are proposed. This method can not only realize the calculation of analytical solutions but can also be performed using simple spreadsheets. In addition, to verify the feasibility of this calculation method, this study uses published data to verify the validity of the analytical solution implemented by the incremental procedure and to study the influence of nonlinear failure criteria on the GRC, especially the mechanical behavior at the intrados of the tunnel and the distributions of tress/displacement on the cross-section of the tunnel. A comparison between the published results and the proposed solution in this study reveals consistent and favorable trends.

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Numerical modelling of stress analysis around rectangular tunnels with large discontinuities (fault) by a hybridized indirect BEM

Cited by 20 publications

References 11 publications

Enhancing tunnel stability in the Himalayas: Empirical design support through numerical modelling

Enhancing tunnel stability in the Himalayas: Empirical design support through numerical modelling

Evolution Laws of Stress–Energy and Progressive Damage Mechanisms of Surrounding Rock Induced by Mining Disturbance

An Improved Incremental Procedure for the Ground Reaction Based on Hoek-Brown Failure Criterion in the Tunnel Convergence-Confinement Method

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