Analysis on the Influence of Dismantling Temporary Lining of Closely-Undercrossing Subway

Zhang, Huijian; Liu, Gongning; Liu, Weixiong; Chen, Zekun; Liu, Qiuyang; Miao, Longgang

doi:10.1007/s10706-023-02452-2

Cited by 4 publications

(3 citation statements)

References 33 publications

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“…Soil heterogeneity refers to the variation or diversity in soil properties within a given area or volume. These properties may include factors such as texture, composition, structure, moisture content, and nutrient levels [37]. In other words, soil heterogeneity indicates that different parts of the soil exhibit different characteristics.…”

Section: Characterization Process Of Spatial Heterogeneitymentioning

confidence: 99%

Reliability Analysis and Risk Assessment for Settlement of Cohesive Soil Layer Induced by Undercrossing Tunnel Excavation

Wang,

Fan,

Wang

et al. 2024

Sustainability

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Due to the complex urban geological environment and physicochemical interactions, the physical and mechanical parameters of the cohesive soil layer in the adjacent construction area show strong spatial variability and correlation. In addition, the actual exploration and test data are very limited because of limited technical and economic conditions. This severely restricts the ability to evaluate the stability of adjacent structures and to prevent and control instability disasters during subway construction. In this study, a generation method of limited sample data for the cohesive soil layer in the adjacent construction area is proposed. The spatial variability and correlation of uncertain mechanical parameters for the clay layer are quantified using incomplete probability data. A calculation method of uncertain settlement for the cohesive soil layer in the adjacent construction area is developed. The distribution fitting tests of settlement characteristics are conducted with different joint distribution functions and correlation structure. A reliability analysis and risk assessment methodology for the settlement of the cohesive soil layer is presented. The reliability value and failure probability induced by undercrossing tunnel excavation are analyzed and predicted. The results show that the bootstrap simulated sampling and random field method can quantify the cohesive soil layer heterogeneity reasonably under limited investigation data. Different joint distribution and correlation structure functions have different effects on the distribution fitting test. The uncertain settlement of the upper center of the tunnel is the largest, and the failure disaster is most likely to occur. The effects of a copula structure and correlation parameter on the failure probability of the cohesive soil layer are sensitive. This research can provide scientific support for public safety and sustainable development in urban subway construction.

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Section: Characterization Process Of Spatial Heterogeneitymentioning

confidence: 99%

Reliability Analysis and Risk Assessment for Settlement of Cohesive Soil Layer Induced by Undercrossing Tunnel Excavation

Wang,

Fan,

Wang

et al. 2024

Sustainability

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show abstract

“…Traditionally, controlling the dismantling length of the temporary lining per round is often used to mitigate these adverse effects. Zhang et al 23 , 24 pointed out that the risk of dismantling temporary tunnel lining can be reduced, and the structure’s safety can be ensured by using step-by-step dismantling temporary lining and installation of the secondary lining. The previous studies 25 – 29 recommended the dismantling length per round using 6 ~ 12 m. Zhang et al .…”

Section: Introductionmentioning

confidence: 99%

Evaluation on displacement risks of dismantling temporary lining in tunnel and optimization on temporary lining configuration

Zhang,

Liu,

Cao

et al. 2023

Sci Rep

Self Cite

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In tunnel engineering, the temporary lining is adopted as an effective countermeasure in mitigating tunnel failure potential, often featured by extra-large cross-sections and/or driven through weak ground conditions. However, dismantling temporary linings negatively impacts primary linings. In this paper, the comprehensive research is conducted on the displacement risk caused by dismantling temporary lining based on two alternative tunneling methods (TM-1 and TM-2). Besides, the following three influence factors are taken into consideration: the axial forces in temporary linings, the thickness of preliminary linings, and the deformation modulus of ground. After that, the tunneling method optimization plan is proposed from the view of these three influence factors. The results show that TM-1 always induces invert uplift, whereas TM-2 mainly brings about invert uplift or sidewall bulging depending on which transverse or vertical linings are dominant in terms of axial force values. For TM-2, the axial force in transverse linings can suppress the development of maximum deformation increment (MDI) value at invert when the axial forces in transverse linings are smaller than those in vertical linings. It is also found that with the further increase of the axial force in transverse linings in TM-2, MDI relocates to the sidewall. Moreover, on the basis of the displacement risk evaluations, an optimization on the temporary lining configurations has been developed by replacing temporary linings with pre-tension anchor cables to reduce the risk of dismantling temporary linings. All the research results can provide some important reference for the similar tunnel engineering in the future.

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“…At the same time, the expansion and reconstruction of the tunnel's structure, safety considerations, environmental protection, and other factors will also promote the demolition of the tunnel lining [11,12]. At present, mechanical demolitions and blasting demolitions are mainly used in the demolition of tunnel linings [13][14][15]. A mechanical demolition is to demolish the lining by using mechanical equipment such as a drilling machine, which has the advantages of a small impact on the surrounding environment and simple operation.…”

Section: Introductionmentioning

confidence: 99%

Risk Assessment Method and Application for Tunnel Lining Demolition Construction

Li,

Zhao,

Fan

2023

Applied Sciences

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The maintenance, reconstruction, and expansion of tunnels often require the removal of existing tunnel linings. However, there is a paucity of research on risk assessments during tunnel lining demolitions. In order to address this gap, we developed a risk assessment model for tunnel lining demolitions using a fuzzy hierarchy comprehensive evaluation and expert surveys. This model draws on on-site construction experience. A fuzzy hierarchy comprehensive evaluation assesses risk probability, while expert questionnaires evaluate risk loss. Our study applied this model to a tunnel project in Qinghai, determining that the overall risk level falls within category “V3”, indicating acceptable risk. Nonetheless, ongoing vigilance and monitoring measures are necessary throughout the construction process. These findings contribute to a deeper understanding of tunnel lining demolition risk assessments for improving project management and safety.

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Analysis on the Influence of Dismantling Temporary Lining of Closely-Undercrossing Subway

Cited by 4 publications

References 33 publications

Reliability Analysis and Risk Assessment for Settlement of Cohesive Soil Layer Induced by Undercrossing Tunnel Excavation

Reliability Analysis and Risk Assessment for Settlement of Cohesive Soil Layer Induced by Undercrossing Tunnel Excavation

Evaluation on displacement risks of dismantling temporary lining in tunnel and optimization on temporary lining configuration

Risk Assessment Method and Application for Tunnel Lining Demolition Construction

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