Effects on a Nearby Bridge of Dismantling Temporary Lining During Excavation of a Shallow-Buried Rectangular Tunnel

Gui-lin, Sheng; Wen, Shipeng; Wu, Fei; Liu, Shixing; Wang, Zhengzheng

doi:10.3389/feart.2021.802662

Cited by 2 publications

(2 citation statements)

References 17 publications

(11 reference statements)

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“…After the freezing started, the ground deformation was small, because the soil was not frozen in the early stage. At that time, the ground settlement caused by the shield was greater Sheng et al, 2021;Wang et al, 2021b;Wang J. et al, 2022) and the farther away from the frozen end, the greater the settlement. After 30 days of freezing, the frozen-curtain crossing circle was basically completed.…”

Section: Measured Analysis Of Surface Subsidencementioning

confidence: 94%

Water-Rich Soft Soil Freezing Method Combined With Steel Sleeve Receiving-Shield Technology Field Test Research

et al. 2022

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The initiation and reception of shields are major risk events for shield construction in water-rich and weak strata. Although the freezing method and the steel sleeve method receiving-shield tunneling technologies both have engineering applications, the environmental safety control effect cannot meet the construction requirements of water-rich soft soil. Considering the shield construction of a typical soft soil layer in Suzhou, China, as a research target, the applicability and safety of the freezing method combined with steel sleeve receiving-shield technology in water-rich soft soil were evaluated based on a field test system. The test results show that, during soil freezing, the temperature change trend of each measuring point in the temperature measuring hole is roughly the same. The freezing process can be divided into five typical stages. The closer the active freezing period of the water-rich soft soil is to the inside of the frozen-soil curtain, the faster the development rate of the frozen wall. The soil cooling gradient increased with an increase in the radial depth. After freezing the curtain circle, the soil frost heave significantly accelerated until the frost heave amount peaked. During the construction process, special attention should be paid to the change in the value of the soil settlement during each stage change to prevent sudden changes in soil displacement. The freezing method, combined with steel sleeve receiving-shield technology, can effectively reduce the environmental disturbance caused by shield construction in water-rich soft soil.

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Section: Measured Analysis Of Surface Subsidencementioning

confidence: 94%

Water-Rich Soft Soil Freezing Method Combined With Steel Sleeve Receiving-Shield Technology Field Test Research

et al. 2022

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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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Effects on a Nearby Bridge of Dismantling Temporary Lining During Excavation of a Shallow-Buried Rectangular Tunnel

Cited by 2 publications

References 17 publications

Water-Rich Soft Soil Freezing Method Combined With Steel Sleeve Receiving-Shield Technology Field Test Research

Water-Rich Soft Soil Freezing Method Combined With Steel Sleeve Receiving-Shield Technology Field Test Research

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

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