The Π-Formed Diaphragm Wall Construction for Departure and Reception of Shield Machine
Abstract
:1. Introduction
2. Methods
2.1. Model Test
2.1.1. Small Displacement Test
2.1.2. Large Displacement Test
2.2. Numerical Simulation
2.2.1. Assumptions
- It was considered that the soil behind the retaining wall was uniformly distributed at each layer, and the loss of material due to overexcitation and voids outside the tunnel perimeter was not considered;
- Intermittences during shield construction were not considered, and it was assumed that the shield machine advanced continuously with continuous palm pressure;
- The mechanical properties of the soil were maintained during the excavation process, regardless of regional discontinuities;
- The initial ground stress was calculated based on only the self-weight stress of the soil without considering the tectonic stress or vibrations of the shield machine on the soil body during excavation;
- The soil was isotropic elastic plastic, and its intrinsic relationships were determined by the modified Mohr–Coulomb criteria.
2.2.2. Model Building
3. Results and Analysis
3.1. Effect of Wing Wall Length on Stress Distribution during Departure and Reception of Shield
3.1.1. Small Displacement Model Test Results and Analysis
3.1.2. Large Displacement Model Test Results and Analysis
3.2. Influence of Wing Wall Length on the Stress Distribution within the Diaphragm Wall during Shield Initiation and Reception
3.3. Surface Settlement and Internal Stress Distribution in Diaphragm Wall at Different Stages of Construction
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Data Availability Statement
Conflicts of Interest
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Material Parameters | Mixed Fill | Clay | C30 | C50 |
---|---|---|---|---|
Elastic modulus (kN/m2) | 6220 | 16,100 | 3 × 107 | 3.45 × 107 |
Poisson’s ratio | 0.37 | 0.33 | 0.2 | 0.2 |
Weight capacity (kN/m3) | 17 | 20.3 | 25 | 25 |
Cohesion (kN/m2) | 18 | 48 | / | / |
Friction angle (°) | 6 | 12 | / | / |
Drainage parameters | Drainage | Drainage | / | / |
Ontogenetic model | Modified Mohr–Coulomb | Modified Mohr–Coulomb | Elastic | Elastic |
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Huang, R.; Hu, J.; Pan, J.; Wu, Y.; Ren, X.; Zeng, D.; Wang, Z.; Wang, S. The Π-Formed Diaphragm Wall Construction for Departure and Reception of Shield Machine. Sustainability 2022, 14, 7653. https://doi.org/10.3390/su14137653
Huang R, Hu J, Pan J, Wu Y, Ren X, Zeng D, Wang Z, Wang S. The Π-Formed Diaphragm Wall Construction for Departure and Reception of Shield Machine. Sustainability. 2022; 14(13):7653. https://doi.org/10.3390/su14137653
Chicago/Turabian StyleHuang, Rui, Jun Hu, Jingbo Pan, Yuwei Wu, Xingyue Ren, Dongling Zeng, Zhixin Wang, and Shucheng Wang. 2022. "The Π-Formed Diaphragm Wall Construction for Departure and Reception of Shield Machine" Sustainability 14, no. 13: 7653. https://doi.org/10.3390/su14137653