Experimental investigation of the failure of shield grease seals under the influence of environmental factors: A case study

Shen, Xiang; Yuan, Dajun; Cao, Liqiang; Jin, Dalong; Chen, Xiangsheng; Gao, Zhiqian

doi:10.1016/j.engfailanal.2021.105975

Cited by 12 publications

(2 citation statements)

References 29 publications

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“…To investigate the problem of shield tail leakage during construction, leading to structural collapse, Yu, Zhou, Chen, Arulrajah, and Suksun Horpibulsuk [2] conducted an experimental study on the failure mode of the shield tail sealing system based on the Foshan tunnel collapse accident. Shen et al [10] discussed the sealing performance of the shield tail in that accident under different environmental conditions by means of model tests. To investigate the tunnel collapse accidents caused by leakage in connecting passages, Zheng et al [11] simulated the occurrence of water and sand inrush by removing a segment at the waist of a model tunnel in a reduced-scale model test and then investigated the change in the external load in the process, and pointed out that the tunnel collapse was due to the redistribution of the external loads.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation on the Leakage-Induced Collapse of Segmental Tunnels

Sun,

Liu,

De Corte

et al. 2024

Applied Sciences

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Sudden leakage during tunnel construction poses a great threat to the safety of the tunnel. There are relatively few studies on the mechanism of structural collapse induced by tunnel leakage, so it is difficult to propose effective control measures. To solve this problem, a coupled fluid–solid strata analysis model and a nonlinear FEM tunnel model were established based on model test results to analyze the mechanism of tunnel collapse. The following conclusions were drawn: (1) A DEM-based coupled fluid–solid model combined with a nonlinear FEM tunnel model can effectively simulate the physical process of tunnel collapse. (2) The mechanism of tunnel leakage-induced strata response is the continuous destabilization and reappearance of the soil arching effect, which restricts the erosion of the soil and results in macroscopic soil caves, and finally leads to the impact load of the destabilized soil. (3) The process of the tunnel structure collapse is as follows: firstly, a large deformation of the tunnel structure is caused by the redistribution of external loads generated by the earth arching effect; then, due to the multiple impact loads from the destabilization of the soil, plastic hinges are generated at the tunnel joints, and the tunnel collapses.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation on the Leakage-Induced Collapse of Segmental Tunnels

Sun,

Liu,

De Corte

et al. 2024

Applied Sciences

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“…This is because the traditional manual attitude adjustment is susceptible to hysteresis and inaccuracy [15]. When the shield tunnels are in the permeable sand layer or under high water pressure, the requirements for attitude control are more stringent, and the construction risk is higher [16]. Yue et al [17] designed a sliding mode robust controller and, based on this model, proposed an automatic control system for shield attitude and trajectory.…”

Section: Introductionmentioning

confidence: 99%

Shield Attitude Adjustment Induced by Slurry Pressure Balance (SPB) Shield Tunneling Considering the Effects of Overbreak Cutter: A Numerical Simulation by DEM and Engineering Application

et al. 2023

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Based on a cross-river tunnel of Wuhan Metro Line 8, we present a two-dimensional discrete element model for shield attitude adjustment considering the effect of overbreak cutters. The shield shell mechanics under the influence of over-excavation rate, over-excavation orientations, and overburden load are simulated, and the tunneling mechanics law and the ultimate range during the adjustment of the shield attitude are investigated. The simulation results indicate the following: (1) The greater the over-excavation rate, the smaller the force exerted by the soil layer in the negative direction of the shield movement; therefore, increasing the over-excavation rate is helpful in expanding the range of shield attitude adjustment. (2) The shield is stressed symmetrically while conducting positive and negative horizontal adjustments in the soil layer, which has a symmetrical distribution, but vertical upward adjustment is more difficult than vertical downward adjustment. (3) With the increase in overburden load, the space of the shield attitude adjustment is gradually reduced at the same over-excavation rate. A good engineering application was achieved in this project using the simulation model. It is recommended to use the attitude adjustment method by controlling the tunneling parameters. In difficult situations such as high overlying loads, the over-excavation cutter can be used to assist in adjusting the shield attitude.

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