Influence of stagnation gradient for face support calculation in Slurry Shield Tunnelling

2020 ◽  
Vol 13 (4) ◽  
pp. 372-381
Author(s):  
Zdenek Zizka ◽  
Sebastian Kube ◽  
Britta Schößer ◽  
Markus Thewes
Keyword(s):  
Shield Tunnelling ◽  
Slurry Shield ◽  
Face Support

scholarly journals Performance of Slurry Shield Tunnelling in Mixed Strata Based on Field Measurement and Numerical Simulation

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Jian Cui ◽  
Wang-Hao Xu ◽  
Yong Fang ◽  
Li-Ming Tao ◽  
Chuan He
Keyword(s):  
Measurement Data ◽  
Tunnel Boring Machine ◽  
3D Models ◽  
Surface Settlement ◽  
Engineering Practice ◽  
Silty Clay ◽  
Pressure Balance ◽  
Shield Tunnelling ◽  
The Difference ◽  
Slurry Shield

There are severe challenges for slurry pressure balance tunnel boring machine (TBM) tunnelling in sandy cobble soil of Beijing, Chengdu, and Lanzhou in China. And the problems caused by tunnelling from silty clay to sandy cobble stratum are more serious. With the change of stratum, the key parameters and surface settlement will change correspondingly. Controlling the key parameters and predicting the surface settlement accurately and efficiently is important for hazard mitigation and risk management. In this study, based on the Tsinghuayuan Tunnel project in Beijing, the key parameters and surface settlement while tunnelling from silty clay to sandy cobble stratum are studied. Firstly, the difference of key parameters while tunnelling in two different strata is analyzed. The analysis shows that immediate responses to changes in the stratum are recommended in order to ensure construction efficiency. Then, a refined 3D finite difference model is developed to simulate the slurry TBM tunnelling in different strata. For refined simulation, three key parameters obtained from measurement data were applied to the 3D models, and the simulation results were compared with the field data. Results show that the refined model has good performance in terms of the accuracy and efficiency. This study provides a good engineering practice reference for slurry TBM tunnelling in mixed strata.

Case Study of Long-Term Ground Settlements Induced by Slurry Shield Tunnelling

2011 ◽  
Vol 243-249 ◽  
pp. 3078-3081 ◽  
Author(s):  
Cun Gang Lin ◽  
Zhong Miao Zhang ◽  
Shi Ming Wu
Keyword(s):  
Careful Analysis ◽  
Soft Ground ◽  
Road Tunnel ◽  
Shield Tunneling ◽  
Shield Tunnelling ◽  
Slurry Shield ◽  
Settlement Time ◽  
Ground Settlements

The Qing-chun Road Cross-river Tunnel is the first road tunnel under the Qiantang River in Hangzhou, and it is also the first experiences of slurry shield tunnelling in Hangzhou soft ground. In order to ensure the safety of construction and reduction of environmental impacts while shield tunnelling, a comprehensive monitoring system was carried out during construction, which included ground settlements, displacements and deformations of installed linings and so on. In this paper, the long-term ground settlements induced by slurry shield tunnelling were described in detail, and careful analysis of monitoring ground settlements was made. This case study shows that: 1. The surface transverse consolidation settlements do not follow the Gaussian curve; usually the largest settlements exist above the centerline of the tunnel or nearby, from where settlements descend outwards. Due to consolidation, the surface settlement troughs widen with time.2. Shield tunneling in soft ground, the turning point in settlement-time curves or settlement rate-time curves can be chosen as the time divides the immediate and long-term consolidation settlements.

Slurry Clogging Criteria for Slurry Shield Tunnelling in Highly Permeable Ground

2019 ◽  
Vol 23 (6) ◽  
pp. 2784-2793 ◽  
Author(s):  
Young-Moo Ryu ◽  
Young-Sam Kwon ◽  
Tae-Hwan Kim ◽  
In-Mo Lee
Keyword(s):  
Shield Tunnelling ◽  
Slurry Shield
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