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Evaluation of shield tunneling-induced soil disturbance in typical structured clays
Abstract Shield tunneling is a process that can disturb the geological environment, causing release of soil stress and damage of soil structure. This study uses the shear strain state to assess the shield tunneling-induced soil disturbance degree (SDD) in three typical structured clays, including Ningbo clay, London clay, and Bangkok clay. Three dimensional finite-element analyses are performed to investigate the tunneling-induced soil disturbance with different tunnel cover-to-depth ratios (C/D). Distribution of the mean effective stress around the tunnel, before and after tunneling, is depicted to evaluate the disturbed zone. Negligible excess pore-water pressure is generated near the tunnel crown, while significant positive and negative excess pore-water pressures occur nearby the springline and invert, respectively. Transversal disturbed zones in Ningbo clay and Bangkok clay look like an “eye” regardless of C/D, while in London clay with a high C/D a circular ring. The transversal disturbed zone in soils with a higher K0 (at-rest earth pressure coefficient) is more uniform than these with a lower K0. Linear relationships between the SDD and the vertical distances below the invert or above the crown are found, while an exponential relationship between the SDD and the horizontal distance from the springline. The applicability of the proposed method is tested against a case history in Shanghai.
Evaluation of shield tunneling-induced soil disturbance in typical structured clays
Abstract Shield tunneling is a process that can disturb the geological environment, causing release of soil stress and damage of soil structure. This study uses the shear strain state to assess the shield tunneling-induced soil disturbance degree (SDD) in three typical structured clays, including Ningbo clay, London clay, and Bangkok clay. Three dimensional finite-element analyses are performed to investigate the tunneling-induced soil disturbance with different tunnel cover-to-depth ratios (C/D). Distribution of the mean effective stress around the tunnel, before and after tunneling, is depicted to evaluate the disturbed zone. Negligible excess pore-water pressure is generated near the tunnel crown, while significant positive and negative excess pore-water pressures occur nearby the springline and invert, respectively. Transversal disturbed zones in Ningbo clay and Bangkok clay look like an “eye” regardless of C/D, while in London clay with a high C/D a circular ring. The transversal disturbed zone in soils with a higher K0 (at-rest earth pressure coefficient) is more uniform than these with a lower K0. Linear relationships between the SDD and the vertical distances below the invert or above the crown are found, while an exponential relationship between the SDD and the horizontal distance from the springline. The applicability of the proposed method is tested against a case history in Shanghai.
Evaluation of shield tunneling-induced soil disturbance in typical structured clays
Meng, Fanyan (author) / Chen, Renpeng (author) / Mooney, Michael A. (author) / Wu, Huaina (author) / Jia, Qi (author)
2022
Article (Journal)
Electronic Resource
English
BKL:
56.00$jBauwesen: Allgemeines
/
38.58
Geomechanik
/
38.58$jGeomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
56.00
Bauwesen: Allgemeines
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB18
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