Study on the Mechanical Behavior of Lining Structure for Underwater Shield Tunnel of High-Speed Railway

Feng, Kun; He, Chuan; Fang, Yong; Jiang, Yingchao

doi:10.1260/1369-4332.16.8.1381

Cited by 31 publications

(9 citation statements)

References 10 publications

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“…To compare the observed earth pressure and the theoretical value, the theoretical earth pressures at the monitoring locations, including the full overburden pressure and Terzaghi's reduced pressure, were calculated. e full overburden vertical earth pressure is calculated by [15][16][17]…”

Section: Comparison Between Observation and Design Valuesmentioning

confidence: 99%

Observed Ground Pressure Acting on the Lining of a Large‐Diameter Shield Tunnel in Sandy Stratum under High Water Pressure

Zhou

2020

Advances in Civil Engineering

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Accurately evaluating the ground pressure on the tunnel lining greatly helps the structure design of a tunnel. In this study, the earth pressure and water pressure on the tunnel lining of four cross sections of a metro tunnel were measured and analyzed and then compared with the theoretical values. Results show that the values and distribution of observed ground pressure acting on the lining are different for different overburden depths. The water pressure measured on-site is approximately equal to the theoretical hydrostatic pressure. The water pressure acting on the shield tunnel lining does not fluctuate with the shield tunnel excavation. The maximum ground pressure was measured in the process of backfill grouting, and the maximum values are approximately larger than 30% of the stable value of the measured pressure. For a shield tunnel under a river with deep water, the water pressure on the lining is dominant and the observed total ground pressure is nearly equal to the water pressure. The findings presented in this paper can provide a reference for the structure design of similar tunnel projects.

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Section: Comparison Between Observation and Design Valuesmentioning

confidence: 99%

Observed Ground Pressure Acting on the Lining of a Large‐Diameter Shield Tunnel in Sandy Stratum under High Water Pressure

Zhou

2020

Advances in Civil Engineering

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“…According to previous research, the segments of underwater shield tunnel are always in compression-bending state in the normal service phase (Feng et al, 2013; Lin et al, 2015; Han et al, 2017; Feng et al, 2018). In order to apply the test condition of compression-bending load and the chloride-induced corrosive environment to the segments shown in Figure 2(a), it is feasible and rational to design the straight “mini segments,” which are modified with eccentric straight beam with brackets at both sides, instead of the prototype curved segments.…”

Section: Accelerated Corrosion Tests Of Mini Segmentsmentioning

confidence: 99%

Experiment study on chloride corrosion deterioration of load-bearing concrete segment

Feng

Liu

et al. 2018

Advances in Structural Engineering

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In order to study the combined action of compression-bending load and surrounding ion erosive environment on underwater shield tunnel, a series of cofferdam-type electrochemical-accelerated corrosion tests of mini segments are carried out to investigate the segment reinforcement corrosion under different compression-bending loads and the change of internal force and rigidity of mini segments under different load-bearing and corroding conditions. Then, the failure pattern of mini segments under different loading and corroding states are recorded and analyzed. The results indicate that the following: (1) the larger the external load, the shorter the initial rust time of the steel bar; (2) the corrosion rate of steel bar increases linearly with time, and the ratio of corrosion of steel bar increases quadratically with time, the larger the load, the more obvious the increase will be; (3) after the corrosion of steel bar, the change rate of the strain for the steel bar increases as the external load augments, and as a matter of fact, the change rate of the strain increases as well, besides, the degree of strain change for compressive steel is obviously lower compared with that of tensile steel bar; (4) the effect of electric corrosion on the deflection of the segments is more obvious with the increase of external load, and a quadratic increase relationship between the deflection and the corrosion is observed in the process of corrosion; (5) It can be concluded that plastic failure is observed for the segments without loading and for those without cracks in the initial stage of loading, which can be indicated directly by the relatively smaller loss rate of steel section, while brittle failure is presented as the failure pattern for the segments with cracks after loading for certain period, which means the loss rate of steel section is relatively larger. The results can briefly provide useful reference for rational design and durability assessment of shield tunnel segmental linings.

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“…Under the combination of water and soil pressures, the stability of the surrounding rock is reduced, and the forces acting on the support structures are increased. In severe cases, catastrophic accidents can occur, such as tunnel collapse, mud burst, and water inrush [44][45][46][47][48][49][50]. Thus, in the present study, to obtain the stress distribution law of the support structure under the influence of external water pressure during the construction and operation of a high-stress water-rich tunnel, a model test system capable of simultaneously considering the water and soil pressures was developed.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Load-Bearing Mechanism of Underwater Mined-Tunnel Lining

Zhang

Chen

Lan

2021

JMSE

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A series of model tests were performed to investigate the load-bearing mechanism of a mined railway tunnel lining under water pressure. To investigate the load-bearing characteristics of different types of linings, a fully closed water pressure exerting device for a noncircular section tunnel was invented. A large-scale model test (1:30) under combined water and soil pressures was conducted to investigate the mechanical characteristics, deformation, stress distribution, crack development process, and failure mode of the underwater mined-tunnel lining. The test results indicated that for the high-speed railway tunnel of Class IV surrounding rock with a design speed of 350 km/h, both the drainage lining and the waterproof lining were controlled by a small eccentric compression under the two test conditions. One had only water pressure, and the other had a variable water pressure and constant soil pressure. The key sections for controlling instability were the bottom of the wall and the inverted arch. The ultimate water head of the drainage lining was 49 m, and the ultimate water head of the waterproof lining was 78 m. In comparison with the drainage lining, the waterproof lining could significantly improve the water-pressure resistance. Thus, design loads of 30 and 60 m are recommended for the drainage and waterproof lining structures, respectively.

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Study on the Mechanical Behavior of Lining Structure for Underwater Shield Tunnel of High-Speed Railway

Cited by 31 publications

References 10 publications

Observed Ground Pressure Acting on the Lining of a Large‐Diameter Shield Tunnel in Sandy Stratum under High Water Pressure

Observed Ground Pressure Acting on the Lining of a Large‐Diameter Shield Tunnel in Sandy Stratum under High Water Pressure

Experiment study on chloride corrosion deterioration of load-bearing concrete segment

Experimental Investigation of Load-Bearing Mechanism of Underwater Mined-Tunnel Lining

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