Novel pipe-roof method for a super shallow buried and large-span metro underground station

Lu, Bo; Dong, Jiachao; Zhao, Wen; Du, Xi; Cheng, Cheng; Bai, Qian; Wang, Zhiguo; Zhao, Mingcheng; Han, Jiqing

doi:10.1016/j.undsp.2021.06.003

Cited by 16 publications

(9 citation statements)

References 16 publications

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“…The passive earth pressure formula is shown in Equation ( 1), where ep, e0, and resent the passive earth pressure, static earth pressure, and compressive stress (k spectively. When the soil is in the passive limit state, the maximum extrusion stress is sh Equation (2), where epcr represents the passive ultimate earth pressure (kPa). The passive earth pressure formula is shown in Equation (1), where e p , e 0, and e s represent the passive earth pressure, static earth pressure, and compressive stress (kPa), respectively.…”

Section: Relationship Between Earth Pressure and Displacement In Limi...mentioning

confidence: 99%

“…In recent years, more and more metro stations have been built in China, and the pipe roofing method is an effective way of constructing metro stations, significantly reducing the ground settlement caused by excavation [1][2][3]. The method consists of jacking in steel pipes to form a pipe-roofing structure and then excavating under the support of the pipe-roofing structure.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Pipe-Jacking Reaction on Earth Pressure of Back Wall of Pilot Tunnel of Subway Station

et al. 2023

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The study of the distribution form and calculation method of the earth pressure on the back wall of a pilot tunnel under a jacking reaction is very important to ensure the safety and smooth construction of the pipe jacking. Based on a metro station in Shenyang, this paper firstly investigates the effects of the changes in the jacking reaction parameters, such as the loading intensity, loading position, and loading area on the earth pressure and the displacement of the back wall in a pilot tunnel through numerical simulation, and then proposes a formula for calculating the soil reaction on the back wall and verifies it by comparison with the FEA (finite element method) results. The results show that the earth pressure distribution pattern of the back wall is similar to the normal distribution curve under the action of the jacking reaction. The horizontal displacement and earth pressure of the back wall will gradually increase with the increase in the jacking reaction. The horizontal displacement of the back wall is greatest when the load is applied to the middle wall, followed by the top wall and the bottom wall. The maximum horizontal displacement is reduced by approximately 24.25% when the loading position changes from the middle to the bottom. As the loading area increases, the maximum horizontal displacement of the back wall decreases, in the order of 11.8% and 14.45% relative to the previous level. The earth pressure of the back wall also decreases, in the order of 17.92% and 22.76% relative to the previous level. The equations presented are applicable to the calculation of the soil reaction in the limit state.

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Section: Relationship Between Earth Pressure and Displacement In Limi...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Pipe-Jacking Reaction on Earth Pressure of Back Wall of Pilot Tunnel of Subway Station

et al. 2023

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“…The pipe roof method involves pre-jacking steel pipes in the upper peripheral soil layer of a structure and forming an advanced support OPEN ACCESS EDITED BY system that can resist upper loads by setting a connection between the steel pipes or changing the structure between adjacent steel pipes (Wang et al, 2020;Cai et al, 2022;Zhang et al, 2022). Because this method can realize micro-disturbance crossing of an environment under the condition of ultra-shallow overburden soil, and the construction area is relatively small, it is very suitable for the construction of underground structures in current densely populated urban spaces (Wang et al, 2018;Lu et al, 2022), such as the shield section project of the Beijing Metro Line eight under the existing Line 10 (Tao et al, 2018), the ultra-shallow buried Ping anli subway station project of Line 10 (Gao, 2018), and the construction project of Taiyuan Yingze Street under the Taiyuan Railway Station (Jia et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Field test and numerical simulation of ground settlement in super shallow buried station excavation supported by transverse pipe roof

Wang

et al. 2023

Front. Earth Sci.

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The pipe roof is an effective means to control the surface settlement during the construction of the super-shallow buried subway station. The transverse pipe roof method can not only reduce the construction work surface, but also improve the construction efficiency by multi-stage flow construction. Based on the transfer station project of the Olympic Sports Center of Jinan Rail Transit Line 3, the ground settlement law caused by the excavation of ultra-shallow buried subway station under the action of transverse pipe roof is analyzed through field measurement. The mechanism of pipe roof controlling ground settlement and the influence of steel pipe spacing and steel pipe length on the bearing mechanism of pipe roof are analyzed by numerical simulation. The following conclusions are drawn. 1) The surface settlement curve caused by the excavation of the small pilot tunnel in the lateral direction of the station is a wavy U-shaped, and the surface settlement curve becomes a smooth U-shaped after the soil is broken. In the longitudinal direction of the station, the surface settlement is jagged, and the surface settlement above the pipe roof is less than the surface settlement between the pipe roofs. 2) After soil excavation, pipe roof can bear the load of surrounding rock and restrain the settlement of soil above, and soil arch effect is formed between pipes to restrain the relaxation of soil between pipes. With the increase of the spacing of the steel pipe, the height of the soil arch increases. After exceeding a certain spacing, the micro-soil arching effect disappears and the surface settlement increases. 3) The length and stiffness of pipe roof will affect the bearing capacity of pipe roof and there is an upper limit. When it exceeds the upper limit, increasing the length or stiffness of pipe roof has little effect on the control effect of ground settlement. The research can provide reference for shallow buried excavation station and other projects.

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“…Xie et al [17,18] studied the surface subsidence pattern and soil pressure distribution caused via excavation under the action of the pipe curtain through model tests and established a theoretical model for the instability. Lu et al [19] studied the pipe curtain deformation and surface subsidence patterns caused via large-section excavation under the novel pipe curtain structure support and derived the optimal construction parameters based on fuzzy mathematical theory. The research in the above literature focuses on two aspects: one is to study the impact of pipe jacking construction on surface subsidence and the other is to study the impact of the excavation of large sections on the deformation characteristics of the surface and the structure.…”

Section: Introductionmentioning

confidence: 99%

Pipe Curtain Deformation and Surface Subsidence Caused via Excavation of Transverse Pilot Tunnel under Pipe Curtain Support

et al. 2023

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Relying on the Shenyang Metro Line 4 Shifu Road station, the impact of the construction parameters of the transverse pilot tunnel on the surface subsidence and the pipe curtain deformation was first studied through numerical simulation, followed by the analysis of the impact of the excavation of the transverse pilot tunnel on the deformation characteristics of the pipe curtain through on-site monitoring. The results show the following: the excavation of the middle pilot tunnel is the key stage of the construction. The excavation sequence of H2 and H4 and H6 → H1 and H3 → H5 and H7 caused the least surface subsidence. Increasing the grouting width and improving the strength of the initial support can control the pipe curtain deformation very well, and it is reasonable to choose 1.5 m as the grouting width.

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Novel pipe-roof method for a super shallow buried and large-span metro underground station

Cited by 16 publications

References 16 publications

Influence of Pipe-Jacking Reaction on Earth Pressure of Back Wall of Pilot Tunnel of Subway Station

Influence of Pipe-Jacking Reaction on Earth Pressure of Back Wall of Pilot Tunnel of Subway Station

Field test and numerical simulation of ground settlement in super shallow buried station excavation supported by transverse pipe roof

Pipe Curtain Deformation and Surface Subsidence Caused via Excavation of Transverse Pilot Tunnel under Pipe Curtain Support

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