Performance of large cross-section tunnel constructed in loose ground by optimal multi-step excavation method

Li, Songtao; Tan, Zhiying; Wu, Jinke; Du, Wentao

doi:10.1007/s12517-020-05961-z

Cited by 5 publications

(2 citation statements)

References 19 publications

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“…Luo et al [18] studied the rule of deformation of temporary tunnel support caused by continuous excavation. Li et al [19] optimized the infuence of the multistep excavation method on the deformation performance of large-section underground tunnels. At present, there are few reports on the statistical distribution characteristics of surrounding rock pressure of shallow and long-span tunnels in the urban subway, especially on the infuence of excavation methods and support parameters on the distribution characteristics of surrounding rock pressure.…”

Section: Introductionmentioning

confidence: 99%

Influence of Support Parameter and Excavation Methods on Statistical Distribution Characteristics of Surrounding Rock Pressure in Shallow-Buried Metro Tunnel

Chen

Zhao²,

Zheng

et al. 2023

Advances in Civil Engineering

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For large-spanshallow-buried tunnels in composite strata of urban metro, the study on the distribution characteristics of surrounding rock pressure is a necessary prerequisite for the reliability analysis of tunnel structure. In this paper, through numerical simulation, the random joint file generated by MATLAB is combined with the discrete element software to establish the corresponding random network model. According to the network model calculation, the influence of surrounding rock pressure on the support structure system is discussed, and the reasonable support parameter types are given. Comparing the whole section excavation with the subsectional excavation, the subsectional excavation can effectively control the internal stress self-adjustment of the surrounding rock and effectively restrain the plastic zone. It provides some theoretical guidance and reference for tunnel reliability design.

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Section: Introductionmentioning

confidence: 99%

Influence of Support Parameter and Excavation Methods on Statistical Distribution Characteristics of Surrounding Rock Pressure in Shallow-Buried Metro Tunnel

Chen

Zhao²,

Zheng

et al. 2023

Advances in Civil Engineering

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“…Nowadays, a tunnel is designed and constructed towards large span and section to accommodate various needs 1 – 7 , and the lining is vital to the tunnel stability during construction 8 – 10 . When excavating a large-section tunnel in a weak stratum 11 , the temporary lining is usually employed to reduce the span with the help of various sequential excavation methods, which include the center diaphragm method 12 , the center cross diaphragm method 13 , 14 , the side drift method 15 , 16 , and other tunneling methods 17 – 20 . Yiouta-Mitra 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

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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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Mechanical responses in the construction process of super-large cross-section tunnel: A case study of Gongbei tunnel

Zhou

Zhao

Tan

et al. 2021

Tunnelling and Underground Space Technology

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Performance of large cross-section tunnel constructed in loose ground by optimal multi-step excavation method

Cited by 5 publications

References 19 publications

Influence of Support Parameter and Excavation Methods on Statistical Distribution Characteristics of Surrounding Rock Pressure in Shallow-Buried Metro Tunnel

Influence of Support Parameter and Excavation Methods on Statistical Distribution Characteristics of Surrounding Rock Pressure in Shallow-Buried Metro Tunnel

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

Mechanical responses in the construction process of super-large cross-section tunnel: A case study of Gongbei tunnel

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