Instability analysis of a deep tunnel under triaxial loads using a three-dimensional numerical method with strength reduction method

Liang, Zheng Zhao; Gong, Bin; Li, Wanrun

doi:10.1016/j.tust.2018.11.015

Cited by 24 publications

(15 citation statements)

References 37 publications

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“…In addition, considering the effect of the intermediate principal stress and selection of the appropriate failure criteria have a significant effect on optimizing the support system. Several studies have investigated the effect of out-of-plane stresses on tunnel problems in elastoplastic rock masses [20][21][22][23]. Based on the nature of a non-plane strain problem, an analytical solution of the cylindrical opening subjected to various in situ axial stresses can be derived by employing the Mohr-Coulomb failure criterion [24].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Excavation-Damaged Zone around Underground Tunnels by Theoretical Calculation and Field Test Methods

et al. 2019

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Excavation-damaged zones (EDZs) induced in underground mining and civil engineering potentially threaten tunnel safety and stability, and increase construction and support costs. In this paper, an investigation of the excavation damaged zone (EDZ) around roadways in Fankou lead-zinc mine in Guangzhou, China is performed by applying a seismic velocity method accompanied by SET-PLT-01 nonmetallic ultrasonic detector. Meanwhile, the in situ stress in the mining area was measured based on the stress relief method with the Swedish high-precision LUT system. The results indicate that the stress field is dominated by the maximum horizontal tectonic stress, and the extents of the EDZ on the roof-floor region are greater than that on the sidewall. In addition, both of the in situ stresses and EDZs show an increasing trend with an increase of depth. Analytical solutions of EDZ around circular openings in the brittle rock mass subjected to non-hydrostatic stress fields are presented in terms of the Mohr–Coulomb and generalized Hoek–Brown criteria, and validated by several cases mentioned above. The extents of EDZ solved by closed-form solutions were found to be in a great agreement with those obtained in the field. Finally, a series of parametric studies are conducted to investigate the effects of cohesion (c), friction angle (φ), geological strength index (GSI), mi, uniaxial compressive strength (σc), and disturbance factor (D) on EDZ. It is shown that the effects of c, φ, GSI, and σc are significant; however, more attention should be paid to consider the dynamic disturbances induced by mechanical drilling, blasting, and seismic waves in tunnel excavations or operations.

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Section: Introductionmentioning

confidence: 99%

Evaluation of Excavation-Damaged Zone around Underground Tunnels by Theoretical Calculation and Field Test Methods

et al. 2019

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“…According to the maximum horizontal stress theory [21,22], the horizontal stress is usually greater than the vertical stress, and the stability of the roadway roof and floor is mainly affected by the horizontal stress. erefore, after the excavation of the bottom gas extraction roadway, the vertical stress transfers to the ribs and the horizontal stress transfers to the roof and floor.…”

Section: Analysis Of Stress and Deformation Law Of A Bottom Gas Extramentioning

confidence: 99%

Research on the Deformation Characteristics and Support Technology of a Bottom Gas Extraction Roadway under Repeated Interference

Pan

et al. 2019

Advances in Civil Engineering

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Taking Pingbao Coal Mine as the engineering background, the stress distribution, surrounding rock displacement, and plastic zone distribution characteristics of a bottom gas extraction roadway are simulated by FLAC3D under multiple disturbances. The mining disturbance due to the overlying coal seam is obtained: the deformation of the roof subsidence and lower rib closure of the bottom gas extraction roadway are larger than the floor heave and upper rib closure, respectively. According to the mechanical analysis of the bottom gas extraction roadway, the equations for calculating the displacement at each point on the surface of the bottom gas extraction roadway and the methods for calculating the maximum displacement, the maximum normal stress, and the maximum shear stress are obtained to reasonably explain the deformation of the bottom gas extraction roadway under multiple disturbances. Then, the bolt-mesh-anchor and ladder beam support mode are designed. After onsite observation of the bottom gas extraction roadway of the 12030 coal mining face of the Pingbao Coal Mine, it is concluded that the deformation characteristics of the bottom gas extraction roadway basically conform to the abovementioned equations and that the support is effective. This paper can provide a reference for the optimization of bottom gas extraction roadway positioning, the determination of support parameters, and the deformation prediction around a bottom gas extraction roadway under similar conditions.

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Section: Introductionmentioning

confidence: 99%

“…And he proposed the sign of collapse in rock mass indicating that the slide move in nitely and the displacement of the slide surface change and develop in nitely. Liang (2019) analyzed the failure mechanism around deep excavations using rock failure process analysis (RFPA) with SRM. There are several advantages for the application of the SRM in geotechnical stability analysis and the SRM is very attractive and commonly accepted approach among the geotechnical researchers and engineers (Huang et al 2012;Shen and Karakus 2013).…”

Section: Introductionmentioning

confidence: 99%

Determination of safety factor for rock mass surrounding tunnel by sudden change of equivalent plastic strain in strength reduction method

Jong

Jang

et al. 2021

Preprint

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A safety factor of rock mass surrounding the tunnel can be determined using the strength reduction method (SRM), however, it is the most important to solve the criterion of critical state. For the stability estimation of rock mass surrounding tunnel, there is need to discuss that it is preferable to use the same criteria for the slope, such as non-convergence of finite element calculation, penetration of plastic strain and sudden change of horizontal displacement. A safety factor can be determined by sudden change of equivalent plastic strain in relationship between a reduction coefficient of strength parameter and equivalent plastic strain. This method is based on the elasto-plastic FEM and the SRM by ABAQUS and Mohr-Coulomb yield criterion. Simulation results using this method show how a safety factor varies with geometries, friction angles and cohesions for circle and square tunnels. Simulation results also show a safety factor varying with quality change of rock mass, pore water pressure and tunnel depth.

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Instability analysis of a deep tunnel under triaxial loads using a three-dimensional numerical method with strength reduction method

Cited by 24 publications

References 37 publications

Evaluation of Excavation-Damaged Zone around Underground Tunnels by Theoretical Calculation and Field Test Methods

Evaluation of Excavation-Damaged Zone around Underground Tunnels by Theoretical Calculation and Field Test Methods

Research on the Deformation Characteristics and Support Technology of a Bottom Gas Extraction Roadway under Repeated Interference

Determination of safety factor for rock mass surrounding tunnel by sudden change of equivalent plastic strain in strength reduction method

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