Response of operating metro tunnels to compensation grouting of an underlying large-diameter shield tunnel: A case study in Hangzhou

Gan, Xiaolu; Yu, Jianlin; Xiao-nan, Gong; Hou, Yuliang; Liu, Nianwu; Zhu, Min

doi:10.1016/j.undsp.2021.07.006

Cited by 30 publications

(5 citation statements)

References 30 publications

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“…Passive control countermeasures are taken from the perspective of protecting existing tunnels, including changing construction parameters such as tunnelling speed, jack thrust, grouting time, and shield posture (Zhang, 2018), as well as multiple construction parts, short footage, and precision blasting (Zhou et al, 2017), isolation of impacts and other measures. Active control measures are taken to reduce the disturbance of surrounding rock caused by tunnelling, including surrounding rock grouting (Liu et al, 2022), compensation grouting (Gan et al, 2022), and stratum reinforcement. It is a common method to take preventive measures for existing tunnels, which can be divided into basic measures, maintenance measures, and strengthening measures.…”

Section: Plane Model Of Lateral Effectmentioning

confidence: 99%

Risk analysis and countermeasures of TBM tunnelling over the operational tunnel

Li²,

Chen³

et al. 2023

Front. Earth Sci.

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To study the risk and control countermeasures of the TBM tunnel construction adjacent to the operational railway tunnel, based on the TBM tunnel project of Chongqing Rail Transit Line 5, this paper first evaluates the quality health degree of the operational tunnel lining (OTL) structure according to the on-site structural inspection. Then, the displacement, internal force, and proximity influence scope influenced by the metro TBM tunnel construction are studied using numerical simulation. Finally, the corresponding control countermeasures are proposed. The results show that: (1) The adjacent construction of the upper TBM tunnel will lead to the uplift deformation trend of the lower operational tunnel, and the uplift deformation of the vault is greater than that of the ballast bed. The influence scope is roughly a parallelogram, with the long axis parallel to the operational tunnel and the short axis parallel to the new TBM subway tunnel. (2) TBM tunnelling over the operational tunnel will cause the transformation of the mechanical mode of the OTL structure from the small eccentric compression mode to the large eccentric compression mode. The OTL structure between the left and right lines of TBM is unfavorable. (3) The longitudinal curve of the bending moment and axial force of the OTL fluctuates greatly within the influence range. The bending moment and axial force are reduced in operational tunnel construction joints. Based on field evaluation and numerical analysis, this paper puts forward some risk control countermeasures, such as TBM tunnelling parameters control, pea-gravel backfilling, backfill grouting, and bottom grouting, which can effectively solve the risk of the operational tunnel structure in the adjacent construction. This study has important reference value for risk control and safety assessment of tunnel in complex adjacent tunnel construction.

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Section: Plane Model Of Lateral Effectmentioning

confidence: 99%

Risk analysis and countermeasures of TBM tunnelling over the operational tunnel

Li²,

Chen³

et al. 2023

Front. Earth Sci.

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“…However, it significantly influenced the sewer pipe. Throughout the analyses, the soil was identified as the governing failure mechanism, and the steel pipe's response remained elastic [26][27][28]. In this analysis, the pipeline's diameter was 1200 mm, and a linear elastic model was used.…”

Section: Materials Model Of Steel Buried Pipementioning

confidence: 99%

An Investigation into the Influence of a New Building on the Response of a Sheet Pile Wall Adjacent to an Existing Buried Pipe

et al. 2023

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This paper explores a solution to safeguard buried pipes located near constructions in the Al-Bisri region of Assiut Governorate by utilizing the concept of the characteristic damage state. This issue has escalated due to the increasing rate of construction activity near pipelines, resulting in a multitude of legal disputes. This study investigates the behavior of buried pipes when influenced by newly constructed buildings using the finite element method. The paper employs two-dimensional models of a 12-story reinforced concrete building with a raft foundation and a series of piles supporting the buried pipe. In this study, we used the PLAXIS software, a 2D plane strain program, to conduct numerical investigations. The soil was idealized using the Mohr–Coulomb model with a 15-node triangular element, while the piles and structures were idealized with a five-node isoperimetric beam element. The point of contact between the beam and the soil was represented by the interface element. Our research examined the distance between the pipe and the footing edge and the distance between the piles and the footing edge. The finite element model results provided nodal displacements and element straining actions for analysis. The results shed light on the behavior of the sheet pile wall and sewage pipe in various situations. The largest bending moment in the sewage pipe was seen in the absence of piling, in contrast, to pile support at Rx = 0.75. The bending moment in the pipe expanded and always occurred at the same location as Rx rose. The clay layer next to the pipe’s lateral deformation was significantly reduced after piling, with the greatest deformation occurring at Rx = 0.

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“…1,2 Zhang et al 3 observed responses of maglev structures undercrossed by three shield tunnels in soft soils. Gan et al 4 completed a case study in Hangzhou to investigate the responses of operating metro tunnels to compensation grouting of an underlying large-diameter shield tunnel. Usually, these precast tunneling segments apply steel rebars as reinforcements of the concrete.…”

Section: Introductionmentioning

confidence: 99%

Behaviors of arched tunneling segments reinforced by basalt fiber reinforced plastic rebars

Hou,

Feng,

Jiang

et al. 2024

Polymer Composites

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In this research, basalt fiber reinforced plastic (BFRP) rebars reinforced tunneling segment (BRRTS) technique was developed. All the BFRP rebars were designed, pre‐cured according to the reinforcement design and the reinforcement drawing of steel rebars reinforced concrete tunneling segments (SRRTSs). Two criteria, the equal reinforcement ratio criterion (ERRC) and the half stiffness principle (HSP), were applied to design the BRRTs. Bending experiments were performed to reveal the deformation, damage and load carrying capacity of the BRRTSs. With flexural‐shearing coupling failure mode, the BRRTS has longer elastoplastic deformation and comparable (ERRC) or much greater (HSP) load carrying capacity compared with traditional SRRTS, indicating that the BRRTS can replace the SRRTS in some cases.Highlights BFRP rebars reinforced tunneling segment was designed, constructed, and tested. BFRP rebars reinforced tunneling segment has long ductile deformation. BFRP rebars reinforced tunneling segment has higher load‐bearing capacity. Utilization efficiency of BFRP rebars varies from 0.565 to 0.646.

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Response of operating metro tunnels to compensation grouting of an underlying large-diameter shield tunnel: A case study in Hangzhou

Cited by 30 publications

References 30 publications

Risk analysis and countermeasures of TBM tunnelling over the operational tunnel

Risk analysis and countermeasures of TBM tunnelling over the operational tunnel

An Investigation into the Influence of a New Building on the Response of a Sheet Pile Wall Adjacent to an Existing Buried Pipe

Behaviors of arched tunneling segments reinforced by basalt fiber reinforced plastic rebars

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