Numerical solutions for tunnels excavated in strain-softening rock masses considering a combined support system

Song, Fei; Rodríguez-Dono, Alfonso

doi:10.1016/j.apm.2020.11.042

Cited by 34 publications

(25 citation statements)

References 63 publications

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“…The strength parameters for a group of tunnel excavation cases are used to verify the proposed semi-analytical procedure (Table 9 ). The cases are from the References 2 , 3 , 6 . Figure 4 demonstrates the distribution of the normalised radial displacement predicted by the semi-analytical procedure and a self-similar method 2 for the SS rock masses with different dilatancy behaviours, which show good agreement with each other.…”

Section: Verificationmentioning

confidence: 99%

“…The tunnel closure should be predicted appropriately as it is utilised to determine the stability of the rock mass and has been adopted in the engineering practices to guide the preliminary support design. Many analytical and numerical methods were proposed to assess the ground reaction curve with different failure criteria, flow rules, and failure behaviours of the rock mass 1 – 6 . The solutions reveal the relationship between the tunnel strain and the support pressure, which are efficacious for determining the support type with a particular geological condition.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of input geological parameters and tunnel strain for strain-softening rock mass based on GSI

Cui

Sheng

Zhang

et al. 2022

Sci Rep

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The regression analysis method is being widely adopted to analyse the tunnel strain, most of which ignore the strain-softening effect of the rock mass and fail to consider the influence of support pressure, initial stress state, and rock mass strength classification in one fitting equation. This study aims to overcome these deficiencies with a regression model used to estimate the tunnel strain. A group of geological strength indexes (GSI) are configured to quantify the input strength parameters and deformation moduli for the rock mass with a quality ranging from poor to excellent. A specific semi-analytical procedure is developed to calculate the tunnel strain around a circular opening, which is validated by comparison with those using existing methods. A nonlinear regression model is then established to analyse the obtained tunnel strain, combining twelve fitting equations to relate the tunnel strain and the factors including the support pressure, GSI, initial stress state, and critical softening parameter. Particularly, three equations are for the estimation of the critical tunnel strain, critical support pressure, and tunnel strain under elastic behaviour, respectively; and the other nine equations are for the tunnel strain with different strain-softening behaviours. The relative significance between the GSI, the initial stress and the support pressure on the tunnel strain is assessed.

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Section: Verificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of input geological parameters and tunnel strain for strain-softening rock mass based on GSI

Cui

Sheng

Zhang

et al. 2022

Sci Rep

View full text Add to dashboard Cite

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“…Hence, using the CCM, an appropriate tunnel design can be achieved, taking into account the distance from the tunnel face where the support will be installed and the corresponding forces to which the support will be subjected until it reaches equilibrium with the ground (point E; Figure 2) (Song and Rodriguez-Dono, 2021). Main elements of the convergence-confinement method (CCM).…”

Section: Introductionmentioning

confidence: 99%

“…Typical graphs obtained for the longitudinal deformation profile (LDP) -above-, and for the ground reaction curve (GRC) and the support characteristic curve (SCC) -below. Based on the work of Alejano et al (2009Alejano et al ( , 2010Alejano et al ( , 2012, Song et al (2020) and Song and Rodriguez-Dono (2021).…”

Section: Introductionmentioning

confidence: 99%

Hydro-mechanical modelling and analysis of multi-stage tunnel excavations using a smoothed excavation method

Song

Rodríguez-Dono

Olivella

2021

Computers and Geotechnics

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“…In the use of FDM can name the studies of Chakeri et al [9], Do et al [15], Jamshasb et al [26], Narayan et al [44], and Ziaei and Ahangari [91] as well. Some other researchers like [2][3][4]82], Zeng et al [92], Song et al [72][73][74] and Song and Rodriguez-Dono [75] presented specific numerical approaches such as the convergence-confinement method (CCM) for tunnels' excavation in rock masses. Although the simplicity of domain methods makes them favorable for seismic analysis of finite media, the models are intricate because of discretizing the whole body and closing the boundaries at a considerable distance from the desired zone.…”

Section: Introductionmentioning

confidence: 99%

Seismic ground response by twin lined tunnels with different cross sections

Panji

Mojtabazadeh-Hasanlouei

2021

SN Appl. Sci.

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In this paper, the geometrical effects of shallow twin lined tunnels with different cross sections are investigated to obtain the anti-plane seismic ground motion under vertical/horizontal incident plane SH waves. A model of long two-dimensional lined tunnels is established and embedded in a homogeneous linear elastic half-plane by an applied numerical time-domain boundary element approach. In addition to a brief introduction to the formulation of the method, by considering five tunnel sections including circular, elliptical, horseshoe, square and rectangular, the surface response is sensitized to observe the normalized displacement amplitude/amplification ratio. In this regard, the angle of the incident wave and the frequency of the response are also included in changing the response pattern. To illustrate the results in both time and frequency domains, they are presented as blanket charts, snapshots, and three-/two-dimensional diagrams. The results showed that the seismic response of the surface is extremely affected by the geometric parameters of underground tunnels, which can create different conditions on the ground surface with shifting the direction of the wavefront. Article Highlights Geometrical effect of twin horizontally overlapping lined tunnels. Applying a time-domain half-plane boundary element method. Illustrating the response in time and frequency domains. The effect of depth and distance ratios on the seismic ground motion. Propagating vertical and horizontal incident SH-wave type. Graphic Abstract

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Numerical solutions for tunnels excavated in strain-softening rock masses considering a combined support system

Cited by 34 publications

References 63 publications

Evaluation of input geological parameters and tunnel strain for strain-softening rock mass based on GSI

Evaluation of input geological parameters and tunnel strain for strain-softening rock mass based on GSI

Hydro-mechanical modelling and analysis of multi-stage tunnel excavations using a smoothed excavation method

Seismic ground response by twin lined tunnels with different cross sections

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