Time-Dependent Reliability Analysis of Deep Tunnel in the Viscoelastic Burger Rock with Sequential Installation of Liners

Do, Duc-Phi; Tran, Ngoc-Tuyen; Mai, Van-Trung; Hoxha, Dashnor; Vu, Minh‐Ngoc

doi:10.1007/s00603-019-01975-6

Cited by 57 publications

(35 citation statements)

References 32 publications

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“…Our findings indicate that tunnels constructed in the weak rock mass, especially for the faults zone, the tunnel lining's stresses rise considerably with time and fluctuating underground water. It is in good agreement with previous works, where time-dependent changes in viscoelastic rock masses and the interaction of liners were studied (Do et al 2020). The introduction of underground water strongly modifies the system's stability, especially when weak rocks are present (Zhou et al 2014).…”

Section: Discussionsupporting

confidence: 91%

“…The long-term behavior and stability of rock engineering structures such as tunnels have received considerable attention (Jia et al 2020;Do et al 2020;Sharifzadeh and Tarifard 2014;Pellet et al 2009). A significant number of engineering applications and laboratory studies indicated the mechanical response related to weak and soft rock's time-dependent behavior is relatively complicated (Zhu et al 2020;Yan et al 2020;To ¨ro ¨k et al 2019;Singh et al 2018;Patil et al 2018;Vlastelica et al 2018;Lyu et al 2017;Gu ¨nther et al 2015; Mis ˇc ˇevic ´and Vlastelica 2014; Zhou et al 2014).…”

Section: Introductionmentioning

confidence: 99%

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Long-term assessment of creep and water effects on tunnel lining loads in weak rocks using displacement-based direct back analysis: an example from northwest of Iran

Tarifard

Görög

Török

2022

Geomech. Geophys. Geo-energ. Geo-resour.

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The time-dependent stability of tunnels is an important and challenging topic, mainly when the tunnel is excavated in incompetent and weak rocks. The creep property of rock is one of the crucial mechanical properties of weak rock and the main factor affecting the long-term stability of rock masses. Also, water as an important environmental factor influences both the short-term and long-term behavior of rocks and is one of the causes of geotechnical engineering disasters, such as tunnel collapse, slope sliding, surface subsidence, etc. In this research, the effects of rock’s creep behavior and underground water on the long-term stability of the Shibli tunnels were analyzed. Geological maps and reports of Shibli tunnels show a highly jointed condition in the surrounding rocks which have been crushed by two orogenic stages. The Burger-creep visco-plastic model was used to simulate the tunnel host rock creep behavior. The model's parameters were adopted based on the displacement-based direct back analysis technique using a univariate optimization algorithm. In addition, the influence of underground water is assessed under the condition of the varying water table. Support capability diagrams were used to evaluate the loading created on the tunnel’s permanent lining due to the creep behavior of rock mass and underground water. This study suggests that the weak rock's creep behavior and underground water significantly affect the time-dependent stability of tunnels. Results show that the induced stresses due to the rock's creep behavior and underground water are more considerable in the tunnel spring-line. Also, the increasing 20 m in the water table approximately decreases ten years of tunnel lining stability time at the fault zone. Article highlights Rocks creep behavior and underground water significantly affect the time-dependent stability of tunnels in weak rocks. Displacement-based direct back analysis using a univariate optimization algorithm was used to determine the CVISC model’s properties. Increasing 20 m in the water table approximately decreases ten years of tunnel lining stability time at the fault zone.

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Section: Discussionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Long-term assessment of creep and water effects on tunnel lining loads in weak rocks using displacement-based direct back analysis: an example from northwest of Iran

Tarifard

Görög

Török

2022

Geomech. Geophys. Geo-energ. Geo-resour.

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“…With the implementation of the strategy of energy development in western China, a number of high dams have been built. However, most of the projects have been built between high mountains, so safe and stable operations of long-distance hydraulic pressure tunnels under complex stress conditions have become a difficult problem [1,2]. As an important part of hydraulic tunnel, the lining structures can not only guarantee the stability and limit the deformations of surrounding rock [3] but also reduce the roughness, improve the flow conditions, and reduce the water head loss [4].…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Hydraulic Fracturing of Pressure Tunnel Lining Based on the 2P-IKSPH Method

Ren

Zhang

et al. 2021

Mathematical Problems in Engineering

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In order to investigate the fracture mechanisms of the pressure tunnel lining under water-stress coupling, based on the traditional smoothed particle hydrodynamics (SPH) method, the solid-water particle interaction method, and the particle damage conversion algorithm are proposed to realize the hydraulic fracturing process, which is called the 2P-IKSPH method. The “particle domain searching method,” the “birth-and-death particle method,” and the “group discrimination searching method” have also been proposed to realize the simulations of complex processes of excavation, lining, and operation of the hydraulic tunnel. Taking the Guzeng hydraulic tunnel as an engineering example, the hydraulic fracturing of tunnel lining under different conditions is numerically simulated. Results show the following: (1) the 2P-IKSPH method can dynamically reflect the stress wave propagation processes of surrounding rock and the damage process of tunnel lining. (2) The lining damage mainly occurs on the vault and the arch foot. (3) The critical internal water pressure increases with the increase of the tunnel buried depth and the thickness of lining, but increases first and then decreases with the increase of the surrounding rock mass grade. The research results can provide some references for the optimization designs of tunnel lining and reinforcement of similar projects. Meanwhile, developing 3D parallelization program based on 2P-IKSPH will be the future research directions.

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“…In particular for mine drifts, by considering the natural variability present within the rock mass through rock mass characterization tools such as the rock mass rating (RMR) or the rock mass quality (Q); and quantifying the uncertainty for the different types of support along the drift, the probability of failure of the rock support associated with each geotechnical domain (representing various limit states) can be determined. Examples of recent RBD applications include rock supports (Do et al 2020;Fang et al 2019;Liu and Low 2017;Lü et al 2017); underground excavations (Gholampour and Johari 2019;Goh and Zhang 2012;Song et al 2016;Yang et al 2018); rock strength estimation (Bozorgzadeh et al 2018); mine pillar design (Deng et al 2003;Song and Yang 2018); rock failure modes in tunnels (Lü et al 2013); and rock slope design (Dadashzadeh et al 2017;Jimenez-Rodriguez and Sitar 2007).…”

Section: Introductionmentioning

confidence: 99%

Reliability Analysis of Rock Supports in Underground Mine Drifts: A Case Study

2021

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Support failures in mine drifts represent potential hazards threatening underground mine safety and productivity. The aim of this study is to determine the reliability index associated with the rock supporting elements used in Ridder-Sokolny mine, an underground mine located in East Kazakhstan. Numerical simulations of the drift support and the first order reliability method (FORM) were employed to carry out the analysis. Several support cases were considered including; shotcrete, bolting, concrete, and combined bolting and concrete as well as unsupported drift case. For each support case, the factors of safety (FS), the reliability index (β) and the probability of failure (PF) were determined in accordance with the corresponding rock mass quality and excavation geometry. The results indicated the average FSs varied little for the different support cases (except for shotcrete); while β and PF vary more significantly between 0.62-3.25 and 0.05-27 (×10 3 %) factor depending on the rock conditions and support installed. The probability of failure of the rock support increases with a decrease in the rock mass quality. Similar trends were observed with an increase of the width/height ratio of the excavations for the same rock domain. These results illustrated that a single FS value obtained from a deterministic method may not always provide a sufficient indication of safety. This is in agreement with the field observations (many of the supports failed). Hence, on the basis of the reliability index of the supports, the requirement in terms of coefficient of variability of the rock mass quality to meet the target performance level was proposed. It is concluded that the results of this study could help improving the drift support design in Ridder-Sokolny mine.

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Time-Dependent Reliability Analysis of Deep Tunnel in the Viscoelastic Burger Rock with Sequential Installation of Liners

Cited by 57 publications

References 32 publications

Long-term assessment of creep and water effects on tunnel lining loads in weak rocks using displacement-based direct back analysis: an example from northwest of Iran

Long-term assessment of creep and water effects on tunnel lining loads in weak rocks using displacement-based direct back analysis: an example from northwest of Iran

Numerical Analysis of the Hydraulic Fracturing of Pressure Tunnel Lining Based on the 2P-IKSPH Method

Reliability Analysis of Rock Supports in Underground Mine Drifts: A Case Study

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