Options for deformable segmental lining systems for tunnelling in squeezing rock

Mezger, Florence; Ramoni, Marco; Anagnostou, Georg

doi:10.1016/j.tust.2017.12.017

Cited by 46 publications

(21 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Fuente et al [10] carried out an back analysis based on the field data of the Frejus highway tunnel and studied the influence of the excavation methods on the tunnel in squeezed stratum by numerical simulation. Mezger et al [11] proposed that the variable linings were more applicable to the large deformation tunnels than rigid linings, which could effectively reduce the pressure of the surrounding rock. Based on the analysis of 35 sections of the Himalayan tunnel, Sharma et al [12] proposed a method for predicting the strength and deformation of surrounding rock by using related experiences.…”

Section: State Of the Artmentioning

confidence: 99%

Study on the Deformation Mechanism of a Soft Rock Tunnel

Yang¹,

Shen²,

Pan³

et al. 2022

Fluid Dynamics &Amp; Materials Processing

View full text Add to dashboard Cite

The large deformation of soft rock tunnel is one of the key problems to be overcome in the tunnel construction stage. In the present study, the deformation mechanism of a representative tunnel and some related countermeasures are investigated using field tests and engineering geological analysis. Owing to the scarce performances of methods based on other criteria such as small pipe spacing, anchor bolt length and steel frame spacing, a new support scheme is implemented and optimized. Results show that shear failure and bedding sliding are produced under high horizontal stress conditions. The low strength of the surrounding rock results in the uneven convergence of both sides of the tunnel. With the aforementioned new support scheme, however, most of such problems can be mitigated leading to good stability properties and ensuing economic advantages.

show abstract

Section: State Of the Artmentioning

confidence: 99%

Study on the Deformation Mechanism of a Soft Rock Tunnel

Yang¹,

Shen²,

Pan³

et al. 2022

Fluid Dynamics &Amp; Materials Processing

View full text Add to dashboard Cite

show abstract

“…This parameter is defined as the ratio of rock displacement at the tunnel wall u R to the maximum unlined tunnel displacement u max . [11] Austria Semmering pilot tunnel [16] Austria Lyon-Torino base tunnel [9,17] Italy Ibbenbüren coal mine tunnel [18] Germany Lötschberg base tunnel [19] Switzerland Yangshan tunnel [15] China Panet and Guenot [28], based on a numerical analysis, derived a function as follows:…”

Section: Displacement Release Coefficientmentioning

confidence: 99%

An analytical design method for ductile support structures in squeezing tunnels

Shao

Qin

2020

Archiv.Civ.Mech.Eng

View full text Add to dashboard Cite

Ductile linings have been proved to be highly effective for tunnelling in heavy squeezing grounds. But there still has not been a well-established design method for them. In this paper, an investigation on an analytical design method for ductile tunnel linings is performed. Firstly, a solution in closed form for ground response of a circular tunnel within Burgers viscoelastic rocks is derived, accounting for the displacement release effect. Then based on the principle of equivalent deformation, the mechanical model of segmental shotcrete linings with yielding elements is established using the homogenization approach. Analytical prediction for behaviour of ductile tunnel linings is provided. Furthermore, the proposed design method for ductile tunnel linings is applied in Saint Martin La Porte access tunnel and the analytical prediction is in good agreement with field monitoring data. Finally, a parametric investigation on the influence of yielding elements on performance of ductile tunnel linings is conducted. Results show that the length of yielding elements poses a great influence on linings. It is feasible and effective to increase the length of yielding elements to obtain the pressure within the bearing capacity of linings. However, yield stress of yielding elements does not significantly affect the performance of the lining. It is suggested to apply yielding elements with relatively higher yield stress in linings for higher stability.

show abstract

“…Chapter 2 was presented in Mezger and Anagnostou (2015). Chapters 14 and 15 were published in Mezger et al (2017) and Mezger et al (2018), respectively, under consideration of the comments and suggestions of Dr. Marco Ramoni, who helped to improve the papers (on the basis of his own doctoral thesis). These chapters have also been presented on several occasions (Mezger et al 2015b, Mezger et al 2015a, Mezger et al 2016.…”

Section: Publicationsmentioning

confidence: 99%

“…This chapter has been published in: Mezger, F.,Ramoni, M., Anagnostou, G. 2018. Options for deformable segmental lining systems for tunnelling in squeezing rock.…”

mentioning

confidence: 99%

On the variability of squeezing behaviour in tunnelling

Mezger¹

2020

View full text Add to dashboard Cite

The magnitude of squeezing deformations in tunnelling often varies over short distances, even if there is no obvious change in the construction method, in the depth of cover, in the lithology or rock structure. As long as the reasons for the variability are not known, the tunnelling-induced convergences cannot be predicted with sufficient reliability. Reliable predictions, however, are important for determining the temporary support or the excavation diameter. Otherwise, large-scale tunnel repairs may be necessary, which can cause delay and additional costs due to remedial actions as well as due to the enforced interruption of other operations in progress at the same time. The analysis of different case studies concerning the AlpTransit project shows that the squeezing variability can be traced back to the heterogeneities in the rock mass at different scales as well as the variation of the orientation of the planes of anisotropy (bedding or schistosity) to the tunnel axis. In order to improve safety and economy of tunnel construction in squeezing ground, the influence of these factors on the convergences was determined quantitatively (by means of analytical solutions or numerical modelling), so that they can be used as indicators during construction for the timely identification and prediction of the squeezing behaviour. Particular attention was paid on factors, whose variation, even if small, may affect the convergences sensitively . Based on these quantitative investigations, design aids were developed, which should help the project engineer to estimate and better understand the variability of the squeezing intensity. The squeezing variability also concerns TBM tunnelling: In contrast to conventional tunnelling, shielded TBMs are particularly vulnerable to squeezing due to the very limited space available. Therefore, in order to better deal with the squeezing variability in TBM tunnelling, different (stiff as well as deformable) lining options were discussed.

show abstract

Options for deformable segmental lining systems for tunnelling in squeezing rock

Cited by 46 publications

References 11 publications

Study on the Deformation Mechanism of a Soft Rock Tunnel

Study on the Deformation Mechanism of a Soft Rock Tunnel

An analytical design method for ductile support structures in squeezing tunnels

On the variability of squeezing behaviour in tunnelling

Contact Info

Product

Resources

About