Key techniques for the largest curved pipe jacking roof to date: A case study of Gongbei tunnel

Zhang, Peng; Ma, Baosong; Zeng, Cong; Xie, Hongming; Li, Xuan; Wang, Daowei

doi:10.1016/j.tust.2016.07.001

Cited by 73 publications

(20 citation statements)

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“…Researchers have also studied the settlement through model tests [16,17] and field monitoring [18][19][20][21][22], which increases the experience in various regions and is of guiding importance when tunnelling in similar strata. Regarding the auxiliary measures to confine settlement induced by metro tunnelling, there are three main aspects: grouting [23][24][25][26][27][28], pipe roof [29][30][31][32][33][34][35], and optimizing support parameters [36][37][38][39][40]. However, although the technology on STM comes a long way, it is still difficult to guarantee construction safety under all conditions.…”

Section: Introductionmentioning

confidence: 99%

Tunnelling‐Induced Settlement and Treatment Techniques for a Loess Metro in Xi’an

Lai

et al. 2020

Advances in Civil Engineering

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Techniques including pre-grouting, long pipe roof, and parameter optimization were employed to ensure the safety of loess metro tunnelling under an existing glass building. Their effects were proved through monitoring the settlement of building and surface during tunnelling. Besides, division of settlement monitoring according to processes, a new method, was conducted to control settlement in time. The highest surface settlement after construction was 16 mm only, meeting the requirement. The result indicates that it is practicable to control the tunnelling settlement strictly in extremely difficult geological areas. The settlement regularities were also studied through numerical simulation; their deformation is larger compared with in situ results while their change trends coincide during most processes. Soil excavations cause settlement primarily, accounting for more than 60%. It is suggested that dual slurry pre-grouting and process-based measurement should be employed before each excavation in water-rich loess areas.

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Section: Introductionmentioning

confidence: 99%

Tunnelling‐Induced Settlement and Treatment Techniques for a Loess Metro in Xi’an

Lai

et al. 2020

Advances in Civil Engineering

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“…The STS structure with or without welding of the flanges can be simulated by appropriately adjusting the material properties of the composite system as discussed earlier in the paper. The impact of welding of the flanges in the STS system on the ground In their previous study, the authors have shown the importance of bottom flanges welding on the performance of STS structures through extensive experimental work [18,19]. In the construction of the Northwest Street station, the flanges at the free face of the STS structure were welded timely after soil excavation as shown in Figure 30a.…”

Section: Horizontal Deformation Of Bridge Pilesmentioning

confidence: 99%

“…The Gongbei tunnel, as a part of Hongkong-Zhuhai-Macao Bridge project, was constructed a combination technology of curved pipe jacking roof for ground support and ground freezing for waterproof. This pipe roofing structure is composed of 36 steel pipe strings of 1.620 m diameter with a 355-358 mm gap between adjacent strings [19,20].…”

Section: Introductionmentioning

confidence: 99%

A Case Study on the Application of the Steel Tube Slab Structure in Construction of a Subway Station

et al. 2018

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It is an effective approach to use Steel Tube Slab (STS) structure combined with the Pile-Beam-Arch (PBA) method to construct a large-space underground station. Traditional construction methods cannot meet the requirement of construction because of the complicated soil layers and high building densities in urban areas. The STS method can effectively increase the rigidity of the supporting system by using steel tubes. Firstly, the stress of bolts and steel tubes are investigated in the construction process based on the field monitoring data. Subsequently, FLAC3D is used to establish a three-dimensional model, which is verified based on the in-situ monitoring data; the effect of excavation process on ground settlement, deformation of STS structure and bridge pile are studied by numerical results. Moreover, the key parameters such as welding of flanges and the step length are studied. The results show that the stress of the steel tubes and flanges does not exceed the designed strength during the construction process. Based on the numerical simulation data, it is indicated that the STS structure can be a very effective and dependable measure in controlling and reducing the surface settlement and the existing adjacent buildings. The numerical results can be used to guide the later construction.

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“…Pipe-roofing method proposed in the 1970s of last century has developed as a superior construction technique applied in underground engineering (Hisatake and Ohno, 2008; Jia et al, 2020; Schumacher and Kim, 2013; Zhang et al, 2016). The pipe-roofing method has advantages for underground construction in complicated geological conditions, especially in terms of restraining the ground settlement and reducing the engineering risk caused by excavations (Chen et al, 2019; Jiang et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the flexural mechanism and performance of channel steel tube slab structure under concentrated loads

Zhang

Zhao

Liu

et al. 2020

Advances in Structural Engineering

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Experimental studies about the flexural performance of channel steel tube slab (CSTS) structure subjected to concentrated loads were carried out, with considering various spacing of adjacent tubes, longitudinal spacing between the channel steel and missing tensile channel steel. A self-designed flexural device equipped with particle image velocimetry (PIV) technology was used to monitor continuous structure deformation and concrete cracking characteristics. In this study, the mechanism and performance of CSTS structure serving in underground engineering were analyzed, and a theoretical model for the bearing capacity of the CSTS structure was proposed. The results show that the failure mode of the test specimens exhibits ductile failure with an average ductility coefficient 2.52. The large shear strain of the concrete was obtained from PIV speckle contour, and it shows the same propagation trend compared with the main cracks appearing in the tests. In addition, the tensile channel steel along with decreasing the spacing of adjacent tubes can increase the bearing capacity of the specimens. The proposed theoretical model shows a reasonable prediction of the ultimate bearing capacity of specimens compared with the experimental results.

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Key techniques for the largest curved pipe jacking roof to date: A case study of Gongbei tunnel

Cited by 73 publications

References 1 publication

Tunnelling‐Induced Settlement and Treatment Techniques for a Loess Metro in Xi’an

Tunnelling‐Induced Settlement and Treatment Techniques for a Loess Metro in Xi’an

A Case Study on the Application of the Steel Tube Slab Structure in Construction of a Subway Station

Experimental investigation of the flexural mechanism and performance of channel steel tube slab structure under concentrated loads

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