A Simplified Way to Evaluate the Effect of Temperature on a Circular Tunnel

Tunnel lining is usually installed with delay behind the tunnel face excavation, which requires that a displacement has to be considered at the tunnel boundary before the support structure installation. This delayed installation comes with a release and redistribution of stress in the rock mass. Internal tunnel lining forces significantly rely on the stress relaxation process taking place in the rock mass surrounding the excavated tunnel. One of the difficulties when designing tunnel supports is, therefore, to analyze the rock-support interaction considering the tunnel lining convergence caused by the stress redistribution. In this study, a simple and effective calculation process based on the combination of two methods, the Hyperstatic Reaction Method (HRM) and Convergence Confinement Method (CCM), is presented to analyze the interaction of rock mass and support structure. The rock mass is assumed to obey the Hoek-Brown criterion. The stress release is also taken into consideration in the present method. The present method is validated by comparing results of the HRM in terms of tunnel lining forces against the analytical ones. Thereafter, the effect of the stress release coefficient, of the tunnel depth and of the Hoek-Brown criterion parameters (the Geological Strength Index (GSI) and σci), on the lining internal forces are presented and discussed.

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Design of deep rock tunnels using hyperstatic reaction and convergence confinement methods

Dias

Anh

2023

Proceedings of the Institution of Civil Engineers - Geotechnica

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Design of Quasi-Rectangular Tunnel Built in the Rock Masses Following Hoek–Brown Failure Criterion

Liu

et al. 2022

Buildings

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Although quasi-rectangular tunnels have been widely used in underground projects, there is no related research work that was carried out to design this kind of tunnel excavated in the rock masses that followed the Hoek–Brown (HB) criterion. By transforming the strength parameters of the rocks that obey the HB failure criterion into equivalent strength parameters of the Mohr–Coulomb (MC) criterion, the lining internal forces of a quasi-rectangular tunnel are investigated in this manuscript in light of bending moments and normal forces using the Hyperstatic Reaction Method (HRM). After comparing with the values of a model test and verifying the present method, the influence of different tunnel depths, H, different rock unconfined compressive strengths, σci, and the geological strength parameter GSI on the lining internal forces of the quasi-rectangular tunnel is then investigated. The obtained results indicate that the parameters H, σci, and GSI have a significant effect on the lining internal forces of the quasi-rectangular tunnel. The work presented in this paper provides a theoretical reference for designing the quasi-rectangular tunnel support structure built in the rock masses following the Hoek–Brown criterion.

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Seismic Bearing Capacity of Strip Foundation on Rock Mass Obeying Modified Hoek-Brown Failure Criterion

Liu

2022

Buildings

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The kinematic method of limit analysis theory was adopted in this paper to calculate the seismic bearing capacity of the shallow strip foundation on a rock mass obeying the non-linear modified Hoek-Brown failure criterion. The generalized Prandtl failure mechanism was chosen, which is different from the multi-wedge failure mechanism assumption commonly used in previous research. Three angle parameters were used to control the mechanism shapes, and the equivalent friction angle and equivalent cohesive were adopted to faithfully reflect the shape characteristics of the failure mechanism. The seismic action was considered using the pseudo-static method, which is simplified to the inertial force determined by the horizontal seismic coefficient. The validation of the present method was carried out by comparing with previous analytical results and the finite element model. Subsequently, the influences of the surface overload, the properties of the rock mass, and the seismic action on the shape and ultimate bearing capacity of the failure mechanism were investigated. For the convenience of practical engineering, this paper gives the ultimate bearing capacity of strip foundations on five representative rock foundations, and the variation trend of bearing capacity with the unit weight of rock mass, surface overload, and horizontal seismic coefficient.

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A Simplified Way to Evaluate the Effect of Temperature on a Circular Tunnel

Cited by 3 publications

References 26 publications

Design of deep rock tunnels using hyperstatic reaction and convergence confinement methods

Design of deep rock tunnels using hyperstatic reaction and convergence confinement methods

Design of Quasi-Rectangular Tunnel Built in the Rock Masses Following Hoek–Brown Failure Criterion

Seismic Bearing Capacity of Strip Foundation on Rock Mass Obeying Modified Hoek-Brown Failure Criterion

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