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Effect of dynamic cutterhead on face stability in EPB shield tunneling
Highlights The effect of cutterhead of the shield machine on the face failure mechanism was investigated. The cutterhead of the shield machine could facilitate the face stability during standstill stage. The influence of the cutterhead during dynamic tunneling depends greatly on opening ratios. A design chart considering the cutter head effect is provided for face stability evaluation.
Abstract Influences of cutterhead of a shield machine on tunnel face stability have been rarely studied in the past. In this study, three-dimensional numerical analyses of face stability of shield tunnels were performed using discrete element method (DEM). In the DEM model, a shield machine with cutterhead panel and cutting tools was generated. The influence of the cutterhead and soil properties on the face failure mechanism were investigated. The results indicate that, the cutterhead of the shield machine could facilitate the face stability during the standstill of the shield machine, while its influence during the dynamic tunneling depends greatly on the opening ratio of the cutterhead. In cases with a dynamic cutterhead, the failure zone and limit support pressure is further developed compared to a static cutterhead. Besides, the soil cover depth presents a negligible impact on the limit support pressure, but it significantly influences the extent of the failure zone. By comparing with the upper bound solution of the rotational mechanism, a design chart considering the cutterhead effect is given to provide a reference for assessing the limit support pressure during the advancing of the shield machine.
Effect of dynamic cutterhead on face stability in EPB shield tunneling
Highlights The effect of cutterhead of the shield machine on the face failure mechanism was investigated. The cutterhead of the shield machine could facilitate the face stability during standstill stage. The influence of the cutterhead during dynamic tunneling depends greatly on opening ratios. A design chart considering the cutter head effect is provided for face stability evaluation.
Abstract Influences of cutterhead of a shield machine on tunnel face stability have been rarely studied in the past. In this study, three-dimensional numerical analyses of face stability of shield tunnels were performed using discrete element method (DEM). In the DEM model, a shield machine with cutterhead panel and cutting tools was generated. The influence of the cutterhead and soil properties on the face failure mechanism were investigated. The results indicate that, the cutterhead of the shield machine could facilitate the face stability during the standstill of the shield machine, while its influence during the dynamic tunneling depends greatly on the opening ratio of the cutterhead. In cases with a dynamic cutterhead, the failure zone and limit support pressure is further developed compared to a static cutterhead. Besides, the soil cover depth presents a negligible impact on the limit support pressure, but it significantly influences the extent of the failure zone. By comparing with the upper bound solution of the rotational mechanism, a design chart considering the cutterhead effect is given to provide a reference for assessing the limit support pressure during the advancing of the shield machine.
Effect of dynamic cutterhead on face stability in EPB shield tunneling
Jin, Dalong (author) / Zhang, Zhiyong (author) / Yuan, Dajun (author)
2021-01-07
Article (Journal)
Electronic Resource
English
Determination of the cutterhead torque for EPB shield tunneling machine
| British Library Online Contents | 2011
Determination of the cutterhead torque for EPB shield tunneling machine
| Elsevier | 2011
Determination of the cutterhead torque for EPB shield tunneling machine
| Online Contents | 2011