Influence of Ground Loss on Settlement of Ground and Maglev Pile Foundation in Shield Tunneling

2021 ◽  
Author(s):  
XiaoTong Gao ◽  
GuoQiang Wang ◽  
Feng Ye ◽  
GuoFeng Zeng
Keyword(s):  
Pile Foundation ◽  
Shield Tunneling ◽  
Ground Loss

scholarly journals Quantitative Analysis of Soil Displacement Induced by Ground Loss and Shield Machine Mechanical Effect in Metro Tunnel Construction

2019 ◽  
Vol 9 (15) ◽  
pp. 3028 ◽  
Author(s):  
Zhu ◽  
Chen ◽  
Zhang ◽  
Tu ◽  
Chen
Keyword(s):  
Three Dimensional ◽  
Elastic Half Space ◽  
Mechanical Effect ◽  
Underground Structures ◽  
Effect Factors ◽  
Shield Tunneling ◽  
Engineering Project ◽  
Total Displacement ◽  
Ground Loss ◽  
Urbanization In China

In order to relieve the increasing ground traffic pressure in the process of urbanization in China, it is inevitable to build more metro lines. However, the stratum movement caused by tunneling affects the safety of adjacent underground structures and aboveground buildings. Therefore, how to evaluate and control the stratum movement is a prominent problem. In this paper, based on the engineering project of an interval tunnel between Shizishan Station and Chuanshi Station in Chengdu Metro Line 7, China, the action mechanism of stratum movement induced by shield tunneling is analyzed, and the effect factors are divided into two categories: ground loss factors and mechanical factors. Combining the advantages of Loganathan method and mirror source-sink method, a new solution of three-dimensional displacement induced by ground loss is proposed. Based on the elastic half-space Mindlin model, the displacement at any point induced by four mechanical effect factors is deduced. Finally, the total displacement is verified by field monitoring data and quantitative analyzed in various parts.

Influence of water-rich tunnel by shield tunneling on existing bridge pile foundation in layered soils

2021 ◽  
Vol 28 (8) ◽  
pp. 2574-2588
Author(s):  
Kan Huang ◽  
Yi-wei Sun ◽  
De-quan Zhou ◽  
Yu-jian Li ◽  
Meng Jiang ◽  
...  
Keyword(s):  
Pile Foundation ◽  
Layered Soils ◽  
Shield Tunneling ◽  
Influence Of Water ◽  
Bridge Pile Foundation

Impact of Shield Tunneling on Adjacent Pile Foundation in Sandy Cobble Strata

2013 ◽  
Vol 16 (8) ◽  
pp. 1457-1467 ◽  
Author(s):  
Chuan He ◽  
Yingchao Jiang ◽  
Yong Fang ◽  
Kun Feng ◽  
Jun Wang
Keyword(s):  
Pile Foundation ◽  
Shield Tunneling

scholarly journals Ground loss model for analyzing shield tunneling-induced surface settlement along curve sections

2022 ◽  
Vol 119 ◽  
pp. 104250
Author(s):  
Huang-Shi Deng ◽  
He-Lin Fu ◽  
Shi Yue ◽  
Zhen Huang ◽  
Yun-Ya Zhao
Keyword(s):  
Surface Settlement ◽  
Shield Tunneling ◽  
Loss Model ◽  
Ground Loss

Numerical Analysis of the Influence of Shield Tunneling to Adjacent Loaded Piles

2012 ◽  
Vol 538-541 ◽  
pp. 548-551
Author(s):  
Feng Bin Zhu
Keyword(s):  
Numerical Analysis ◽  
Case History ◽  
Pile Foundation ◽  
Pile Group ◽  
Single Pile ◽  
Bending Moments ◽  
Shield Tunneling ◽  
Railway Line ◽  
Axial Forces ◽  
Horizontal Displacements

Suzhou Light Railway Line 1 is used as a case history to investigate the effects of the non-homogeneity of soil, distance to the tunnel and cushion cap on the pile foundation performance including horizontal displacements, settlements, axial forces and bending moments. According to behaviors of the single pile and pile group under different concentrated loads, it is concluded that with tunneling, the loaded pile foundation will rotate toward to the tunnel and their bearing capacity is influenced significantly.

Ground Deformation Rule Induced by Shield Tunneling Construction

2011 ◽  
Vol 90-93 ◽  
pp. 670-675
Author(s):  
Xin Jiang Wei ◽  
Yang Zhou ◽  
Gang Wei ◽  
Jie Hong
Keyword(s):  
Ground Deformation ◽  
Three Dimensional ◽  
Analytical Calculation ◽  
Horizontal Displacement ◽  
Tunnel Construction ◽  
Shield Tunneling ◽  
Dimensional Solution ◽  
Ground Loss ◽  
Good Agreement ◽  
Ground Displacements

In this paper, Ground deformation in shield tunneling construction is researched. It is put forward that ground deformation is caused by three reasons, which are ground loss, the positive thrust and the friction. By solving the three-part respectively, the three-dimensional solution formula can be obtained after superposing these. This method is used to calculate the tunnel construction phase at any point in the level of vertical settlement and horizontal displacement. As shown in analytical calculation, the predicted ground displacements of this method are in good agreement with the measured values.

scholarly journals Influence of Shield Tunnel and Train Load on Existing Bridge Piles

2020 ◽  
Author(s):  
Daxin Geng ◽  
Cheng Tan ◽  
Ning Wang ◽  
Yalong Jiang
Keyword(s):  
Pile Foundation ◽  
High Speed ◽  
Rapid Development ◽  
Stable State ◽  
Vertical Displacement ◽  
Shield Tunnel ◽  
Distribution Law ◽  
Shield Tunneling ◽  
Railway Bridges ◽  
The Right

With the rapid development of urban rail transit, the shield tunneling method used to construct new subways across existing high-speed railway bridges often occurs. In this paper, under the combined action of the double-track construction of a shield tunnel in a certain project and the train load, railway pile foundation from the deformation of the bridge pier and the settlement of the pile foundation. The vertical displacement distribution law analyzes the impact of shield construction and train load on the pile foundation of the existing bridge, and at the same time evaluates the safety of the bridge accordingly. The results show that the deformation of the existing bridge caused by the shield tunneling construction and the train load mainly affects the initial excavation stage. With the excavation, the settlement value gradually stabilizes, and the settlement of the bridge decreases slightly when the left line tunneling is completed. The shield tunneling of the right line has a certain compensation effect on the left line, and the overall settlement value of the bridge pile foundation is in a stable state.

scholarly journals The Environmental Effects Induced by a Metro Shield Tunnel Side-Crossing on Adjacent Pile Foundations and Its Impact Partition

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Hui Hu ◽  
Yimo Zhu ◽  
Gang Zhang ◽  
Heng Zhang ◽  
Peng Tu
Keyword(s):  
Pile Foundation ◽  
Small Diameter ◽  
Internal Force ◽  
Impact Factors ◽  
Shield Tunnel ◽  
Strong Impact ◽  
Shield Tunneling ◽  
Winkler Elastic Foundation ◽  
Impact Area ◽  
The Impact

With the advantages of fast construction speed and small disturbance to stratum, shield tunneling is becoming the preferred construction scheme for metro construction. However, if the disturbance of stratum cannot be clearly understood, it will affect the safety of adjacent underground structures and aboveground buildings. Based on the construction of the interval tunnel between Shizishan station and Chuanshi station of Chengdu metro line 7 project, this paper proposed a simplified calculation method to analyze the impact of shield excavation on adjacent pile foundation. A two-stage method of modified Peck formula and Winkler elastic foundation model was used to investigate the additional displacement and internal force of pile. A three-dimensional numerical model validated with the field test data was performed to compare with the theoretical results. The impact factors and their impact degree were discussed. The results show that the additional displacement and internal force are at a reasonable and acceptable level. The permanent pile foundation should adopt the small diameter pile as far as possible. When the small diameter pile foundation cannot meet the stress requirements, the design scheme of the pile group should be adopted. The area around shield tunnel is divided into strong impact area of pile foundation (S ≤ 0.75 D), slight impact area (0.75 D ≤ S ≤ 1.5 D), and no impact area (S > 1.5 D). The pile researched in this paper (S = 0.83 D) is in the slight impact area.

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