Design and optimisation of the lining of a tunnel in the presence of expansive clay levels

Pérez-Romero, J.; Oteo, C; Fuente, Pablo de la

doi:10.1016/j.tust.2006.02.002

Cited by 18 publications

(5 citation statements)

References 1 publication

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“…Moreover, in a study by J. Pérez-Romero on the Trasvasur Tunnel (Canary Islands, Spain), it was shown that the expansion plane appears at different relative positions to the cross-section of the tunnel: below the floor, at the height of the sidewalls, or above the roof. In this case, it is particularly recommended to use circular or similar cross-sectional shapes as they are the most effective in absorbing the thrust generated by the expansion plane [31].…”

Section: Model Parameters and Calculation Resultsmentioning

confidence: 99%

Assessing Mechanical Properties and Response of Expansive Soft Rock in Tunnel Excavation: A Numerical Simulation Study

Ma,

Chen,

Chang

et al. 2024

Materials

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This study investigates the dynamics of moisture absorption and swelling in soft rock during tunnel excavation, emphasizing the response to support resistance. Utilizing COMSOL numerical simulations, we conduct a comparative analysis of various strength criteria and non-associated flow rules. The results demonstrate that the Mohr–Coulomb criterion combined with the Drucker–Prager model under compressive loads imposes stricter limitations on water absorption and expansion than when paired with the Drucker–Prager model under tensile loads. Restricted rock expansion leads to decreased horizontal displacement and ground uplift, increased displacement in the tunnel’s bottom arch, and significantly reduced displacement in the top arch. The study also considers the effects of shear dilation, burial depth, and support resistance on the stress and displacement of the surrounding rock. Increased shear dilation angles correlate with greater rock expansion, resulting in increased horizontal displacement and ground uplift. The research study concludes that support resistance is critical in limiting the movement of the tunnel’s bottom arch and impacting the stability of the surrounding rock. Additionally, the extent of rock damage during the excavation of expansive soft rock tunnels is found to be minimal. Overall, this study provides valuable insights into the processes of soft rock tunnel excavation and contributes to the development of more efficient support systems.

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Section: Model Parameters and Calculation Resultsmentioning

confidence: 99%

Assessing Mechanical Properties and Response of Expansive Soft Rock in Tunnel Excavation: A Numerical Simulation Study

Ma,

Chen,

Chang

et al. 2024

Materials

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“…In view of the seriousness of tunnel accidents caused by such expansive rock diseases, many researchers have studied the mechanism and treatment measures of tunnels in recent decades (Ren et al, 2006;Cui et al, 2014;Isago N. et al, 2014;Liu et al, 2011a;Liu et al, 2011b;Liu et al, 2020c;Liu et al, 2020d). During the tunnel excavation of the Trasvasur tunnels (Canary Islands, Spain) (Pérez-Romero et al, 2007), found that it is advisable to seal off the excavation as soon as possible to prevent change due to the decompression of the swelling clay levels and the absorption of water from the tunnel itself. Researching the deformation mechanism of swelling rock (Zhang et al, 2021b;Isago et al, 2015;Oldecop and Alonso, 2012), it was found that these measures that was the implementation of bolts (Waldemar 2015; Jeong et al, 2015), reinforced linings (Li et al, 2019;Bilir and Sarıgül, 2021;Korzeniowski et al, 2015), allowable deformation to reduce expansion pressure measurement (Aksoy et al, 2012;Sun and Wang, 2011) and so on can greatly reduce the probability of large deformation of the tunnel.…”

Section: Introductionmentioning

confidence: 99%

Failure Characteristics and Treatment Measures of Tunnels in Expansive Rock Stratum

Yang

Liu

et al. 2022

Front. Earth Sci.

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During the operation period, disasters caused by the expansion of tunnel surrounding rock often occurs, but the understanding of this problem is still insufficient. This study investigated the disaster that occurred in the tunnel based on numerical simulation on a case in Dugongling, China. First, the main diseases, including lining cracks, pavement uplift and cable trench overturning and so on, of the tunnel were investigated in the field. According to the geological data, the expansion and softening of the surrounding rock was likely to be the main cause of lining cracking. Then, this paper proposed a formula for calculating the expansion force of expansive rock when the water content changes. Based on the expansion force calculation formula, the most severely damaged section was numerically analyzed, and the results were compared with the on-site monitoring data. According to the simulation results, the deformation of the surrounding rock and the stress of the supporting structure were studied. The research showed that the expansion and softening of the surrounding rock led to an increase in the load acting on the lining structure, which intensified the development of disasters. Finally, four reinforcement schemes were proposed and simulated, and the best reinforcement scheme was evaluated. The results of this study can provide a reference for the design and construction of this project and similar projects.

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“…ere are many literatures reporting tunnel support design or optimization regarding rock mass properties and support structures [45,46]. However, the number of literatures reporting extremedeformation-induced support structure failure is limited, and thus, a comprehensive supporting system is required to relieve the damage of tunnel structure in squeezing ground.…”

Section: Introductionmentioning

confidence: 99%

Support System for Tunnelling in Squeezing Ground of Qingling-Daba Mountainous Area: A Case Study from Soft Rock Tunnels

Wang

Lai

Garnes

et al. 2019

Advances in Civil Engineering

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Tunnelling or undertaking below-ground construction in squeezing ground can always present many engineering surprises, in which this complicated geology bring a series of tunnelling difficulties. Obviously, if the major affecting factors and mechanism of the structure damage in these complicated geological conditions are determined accurately, fewer problems will be faced during the tunnel excavation. For this study, reference is made to four tunnel cases located in the Qingling-Daba mountainous squeezing area that are dominated by a strong tectonic uplift and diversified geological structures. This paper establishes a strong support system suitable for a squeezing tunnel for the purpose of addressing problems exhibited in the extreme deformation of rock mass, structure crack, or even failure during excavation phase. This support system contains a number of temporary support measures used for ensuring the stability of tunnel face during tunnelling. The final support system was constructed, including some key techniques such as the employment of the foot reinforcement bolt (FRB), an overall strong support measure, and more reserved deformation. Results in this case study showed significant effectiveness of the support systems along with a safe and efficient construction process. The tunnel support system proposed in this paper can be helpful to support design and provide sufficient support and arrangement before tunnel construction in squeezing ground.

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Design and optimisation of the lining of a tunnel in the presence of expansive clay levels

Cited by 18 publications

References 1 publication

Assessing Mechanical Properties and Response of Expansive Soft Rock in Tunnel Excavation: A Numerical Simulation Study

Assessing Mechanical Properties and Response of Expansive Soft Rock in Tunnel Excavation: A Numerical Simulation Study

Failure Characteristics and Treatment Measures of Tunnels in Expansive Rock Stratum

Support System for Tunnelling in Squeezing Ground of Qingling-Daba Mountainous Area: A Case Study from Soft Rock Tunnels

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