Negative pressure testing standard for welded scar airtightness of waterproofing sheet for tunnels: Experimental and numerical investigation

Qin, Yiwen; Lai, Jinxing; Li, Chong; Fan, Fei; Liu, Tong

doi:10.1016/j.tust.2022.104930

Cited by 14 publications

(3 citation statements)

References 27 publications

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“…Terefore, although the state distribution of the plastic zone of the superlarge cross-section tunnel passing through the backfll of the giant cave is bad, it has been controlled to a certain extent after diferent reinforcement measures to ensure safe construction. vibrating-wire receiver, respectively [58][59][60][61]. Trough the above monitoring items, the changes in displacement could be obtained.…”

Section: Plastic Zone Analysismentioning

confidence: 99%

Study on Construction Response Characteristics of Large Cross-Section Tunnel Crossing Huge Karst Cave Backfill

Chen

Cai

Zhang

et al. 2023

Shock and Vibration

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The existence of giant karst cave can cause collapse and water inrush hazards during the excavation of the karst tunnel, causing serious economic losses. In this paper, based on the FEA software MIDAS, a numerical simulation model for the backfilling of a large karst cave through a large cross-section tunnel was established. The distribution characteristics and change rules of the displacement field, stress field, horizontal support stress, and plastic zone of the tunnel surrounding rock and backfill were explored. The first stage of tunnel excavation leads to a sharp increase in the displacement of the tunnel’s surrounding rock and the deterioration of the plastic zone, which should be strengthened and monitored. The tunnel arch, waist, and wall footing areas were prone to stress concentration. The two layers of horizontal support force show a certain regularity, showing a sharp increase and a gradually smooth growth trend. Meanwhile, the site monitoring results for arch settlement and horizontal convergence of the mega cavern tunnel were analyzed. The results show that the numerical calculation results were in good agreement with the values of site monitoring data. The average errors of final crown settlement and horizontal convergence were 8.6% and 15.9%, respectively, which verified the correctness of the numerical modeling method. This project can provide reliable experience for the construction of similar large cavern tunnels.

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Section: Plastic Zone Analysismentioning

confidence: 99%

Study on Construction Response Characteristics of Large Cross-Section Tunnel Crossing Huge Karst Cave Backfill

Chen

Cai

Zhang

et al. 2023

Shock and Vibration

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“…In an effort to identify the common characteristics of freezing damage in lining structures subjected to freeze-thaw cycles, this section examines instances of tunnel lining damage resulting from freeze-thaw cycles in several cold regions. From the statistics, there are mainly three kinds of freezing damage occurring in the tunnel lining, namely lining cracking, lining leakage and icing, and lining shedding [14][15][16][17][18][19][20][21][22][23][24][25].…”

Section: Investigation and Analysis Of Freezing Damage Of Lining Stru...mentioning

confidence: 99%

Recent Progress in the Cracking Mechanism and Control Measures of Tunnel Lining Cracking under the Freeze–Thaw Cycle

Yuan,

Ma,

Liu

et al. 2023

Sustainability

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With the rapid increase in the scale and number of tunnels in cold regions, the frost damage problems, such as cracking of the lining structure under the action of freeze–thaw cycles are becoming increasingly prominent. This review article collects and sorts out the frost damage phenomena that occur in the lining structure of tunnels in cold regions under the action of freezing and thawing cycles, classifies the frost damage phenomena into structural frost damage and non-structural frost damage, and proposes that the research on the mechanism of lining frost damage and its prevention measures should focus on lining cracking. According to the damage degree of the freeze–thaw cycle to the lining structure and its influence on tunnel operation, the cracking mode and cracking stage of lining are introduced. The analysis focuses on the mechanism of cracking in lining structures subjected to freeze–thaw cycles, considering the external force caused by frost heaving, the alteration of mechanical properties in lining concrete, and the internal changes in the microstructure of the concrete. Additionally, the factors that contribute to the occurrence of lining cracking are summarized. Based on this, corresponding control measures have been organized to provide reference for the development of cracking of the lining structure under the action of freeze–thaw cycle.

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“…The stress distribution and deformation characteristics of surrounding rocks will help to understand tunnel stability research. Researchers (Liu et al, 2020;Antão et al, 2021;Fernández et al, 2021;Han et al, 2021;Nguyen and Nguyen-Son, 2022;Pelech et al, 2022;Zhuo et al, 2022;Qin et al, 2023c) established numerical models based on the numerical method, e.g., finite element method or discrete element method with the continuous improvement of computer performance and the development of computing technology. Numerical modeling is closer to the accurate geometric scale, surrounding rock materials, loading effects, boundary conditions, etc., and visualizes the process of surrounding rock loading evolution.…”

Section: Introductionmentioning

confidence: 99%

The stability evaluation of clay tunnels via the non-linear deterioration of physical and mechanical properties of surrounding rocks

Huang

Liu²,

Ma³

et al. 2023

Front. Earth Sci.

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Simple, fast, and reliable methods for the stability evaluation of tunnels can facilitate the construction and development of tunneling projects. The problems related to tunnel stability at this stage can be well analyzed via theoretical analysis method, model test method, or numerical analysis method. On the other hand, those methods are hard to be effectively analyzed these projects with higher importance, shorter decision and design period, and more urgent construction period. This paper proposed research works on the stability evaluation of clay tunnels. Firstly, a state function with the variables of stress and strain state is presented to predict the stress and strain states of surrounding rocks caused by tunnel excavation, which characterize the physical-mechanical state of surrounding rocks (also called stability state). Secondly, the non-linear deterioration of the physical and mechanical properties of surrounding rocks will be simulated, and the expressions and calculation methods of the tunnel stability reserve factor will be yielded. Finally, the results of the proposed method were compared with the strength reduction method and the limit equilibrium method with a clay tunnel example. The comparison between the three feature points of the arch crown, sidewall, and arch bottom showed that the stability reserve factor of the clay tunnel was smaller than those of the strength reduction method and the limit equilibrium method. The values of limit displacement obtained by the proposed method were closer to the field monitoring data than that of the strength reduction method. Therefore, this study could be better applied to the stability evaluation of clay tunnels.

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Negative pressure testing standard for welded scar airtightness of waterproofing sheet for tunnels: Experimental and numerical investigation

Cited by 14 publications

References 27 publications

Study on Construction Response Characteristics of Large Cross-Section Tunnel Crossing Huge Karst Cave Backfill

Study on Construction Response Characteristics of Large Cross-Section Tunnel Crossing Huge Karst Cave Backfill

Recent Progress in the Cracking Mechanism and Control Measures of Tunnel Lining Cracking under the Freeze–Thaw Cycle

The stability evaluation of clay tunnels via the non-linear deterioration of physical and mechanical properties of surrounding rocks

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