Surface settlement of subway station construction using pile-beam-arch approach

Yu, Lin; Zhang, Dingli; Fang, Qian; Cao, Liqiang; Tian, Xu; Li, Qianqian

doi:10.1016/j.tust.2019.05.016

Cited by 47 publications

(20 citation statements)

References 28 publications

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“…When the PBA method is applied to excavation during subway construction, a small pilot tunnel can be excavated first, and then the soil can be excavated safely due to this initial support, which can reduce disturbance to the soil above as much as possible [7][8][9][10]. Relevant results have shown that the most important step during construction that causes settlement using the PBA method is the excavation of the pilot tunnels [11][12][13][14]. In the construction of multiple pilot tunnels, the choice of operation is the dominant factor affecting surface settlement.…”

Section: Introductionmentioning

confidence: 99%

Study on Stress Field Distribution during the Construction of a Group of Tunnels Using the Pile–Beam–Arch Method

Huang

et al. 2022

Buildings

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To study stress field distributions during the construction of a group of tunnels using the pile–beam–arch method, the excavation for an underground station of Beijing subway line 7 was taken as an engineering problem, and a numerical structural model of a tunnel group was built with the aid of software. In this model, four stress-monitoring planes were set up to extract the data obtained from monitoring stress. The construction of the pilot tunnels was simulated according to six established construction schemes, and images were generated for the stress field distribution on each monitoring plane using different schemes. Finally, a verification of physical model tests was carried out. The results show that the effect of excavation on vertical stress in pilot tunnels has a range that is essentially equal to twice the width of the station. After the excavation of pilot tunnels, peaks appeared both at the tops of the pilot tunnels and between the bottoms of the tunnels; moreover, valleys appeared both at the bottoms of the pilot tunnels and between the tops of the tunnels. Pilot tunnels located at the top of the group were less affected during excavation than the tunnels located at the bottom of the group both in stress concentration factor and in the point of extreme stress. Finally, the model verified the numerical simulation results of the stress variation law.

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Section: Introductionmentioning

confidence: 99%

Study on Stress Field Distribution during the Construction of a Group of Tunnels Using the Pile–Beam–Arch Method

Huang

et al. 2022

Buildings

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“…e core idea of the PBA method is to form an overall support system composed of the lateral wall support structure and arch initial support structure to ensure sufficient safety during the excavation of the main part of the station and effectively control the settlement of the stratum. e PBA method has its unique advantages in the construction of metro stations and strong applicability to the construction environment [16,17].…”

Section: Introductionmentioning

confidence: 99%

Study on the Applicability of an Improved Pile‐Beam‐Arch Method of Metro Station Construction in the Upper‐Soft and Lower‐Hard Stratum

Guo

Jiang

Wang

2021

Advances in Civil Engineering

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The main challenge for metro station construction is to ensure the construction schedule while minimizing the impact on the surrounding environment. Based on the characteristics of the upper-soft and lower-hard stratum in the Dalian city of China, a special structure with six pilot tunnels and three spans of the pile-beam-arch (PBA) method is proposed and applied to the construction of the Labor Park metro station. In this study, laboratory experiments, numerical simulation analysis, and field monitoring data are used to investigate the applicability of six pilot tunnels and three spans of the PBA method in the process of construction. In the process of numerical simulation, the ground surface settlement, arch vertical displacement, the horizontal displacement of rock mass on both sides of the station, and vertical stress of support structure are analyzed. The numerical simulation results are found to be in good agreement with field measurement. Furthermore, the results indicate that, in the construction of six pilot tunnels and three spans of the PBA method, pilot tunnel construction and arch construction have a great influence on the surface settlement. The part of the initial vertical support of the pilot tunnels is removed, which caused the change of the position of maximum vertical stress and the redistribution of vertical stress. Because of reinforcement by side piles on both sides of the station, the horizontal displacement of the rock mass was reduced by 44.76% compared with that without reinforcement. The six pilot tunnels and three spans of the PBA method can effectively control the surface settlement, arch vertical displacement, and horizontal displacement of the rock mass.

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“…Tan et al based on the Wangjing tunnel project studied the segment displacement and mechanical response of the shield tunnel with a diameter of 10.5 m in the process of shield construction and cross-passage construction [4]. Fang et al and Zhang et al calculated the seepage-induced effective stress around a tunnel in an elastic half-plane [5][6][7]. Li et al defined a parameter called the partial failure ratio to describe the range of partial failure, which they used to analyze the limit support pressure and failure zone.…”

Section: Introductionmentioning

confidence: 99%

Field Tests on the Stress Characteristics of Enriched Water Tunnel Invert

Li²,

Wang

et al. 2021

Geofluids

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To monitor the changes in the force of the tunnel invert steel bars after the groundwater level changes, field tests were performed to accurately and comprehensively characterize the stress acting on the rebar of a tunnel invert. Changes in stress and temperature were monitored for two layers of rebar (upper and lower) in an actual tunnel invert during its repair. The results showed that the changes in stress followed different paths for the upper and lower layers. After the groundwater is replenished, the maximum tensile stress of the rebar was 17.3 MPa, and the maximum compressive stress was 120 MPa. Major changes in stress were observed 2–6 days after rain. Based on this, the seepage path of groundwater is analyzed. During this period, the compressive stress increased threefold, and the tensile stress increased 9.5-fold. The rebar stress in the tunnel invert followed a Gaussian distribution after stabilizing. Four phases of stress progression are identified and discussed. The results can provide data support and theoretical basis for the treatment of invert floor heave in enriched water tunnel.

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Surface settlement of subway station construction using pile-beam-arch approach

Cited by 47 publications

References 28 publications

Study on Stress Field Distribution during the Construction of a Group of Tunnels Using the Pile–Beam–Arch Method

Study on Stress Field Distribution during the Construction of a Group of Tunnels Using the Pile–Beam–Arch Method

Study on the Applicability of an Improved Pile‐Beam‐Arch Method of Metro Station Construction in the Upper‐Soft and Lower‐Hard Stratum

Field Tests on the Stress Characteristics of Enriched Water Tunnel Invert

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