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.

Effect of Shield Tunneling on High-Speed Railway Bridges under the Influence of Train Operations

2013 ◽  
Vol 831 ◽  
pp. 423-429
Author(s):  
Xiao Jing Wang ◽  
Kai Xu
Keyword(s):  
High Speed ◽  
Internal Force ◽  
Shield Tunnel ◽  
Railway Bridge ◽  
The Finite Element Method ◽  
Shield Tunneling ◽  
Tunnel Excavation ◽  
High Speed Railway ◽  
Railway Bridges ◽  
The Impact

This paper is based on one project of Metro shield tunnel across a high-speed railway bridge. In the study the impact of train operations is taken into account, the finite-element method is adopted to analyze effect of shield tunneling. The conclusions indicate that according to the different tunnels and relative positions of pile, the excavation of the tunnels would have different effects on pile foundation. When the construction of shield across the bridge, the nature of the soil and will have an effect on deformation and stress of pile. Due to tunnel excavation of bridge internal force on bridge attached to the forces of good roles and bad role. Additional deformation of the beams and the additional forces are very small, so they will not affect the bridge work.

Impact of Double-O-Tube Shield Tunnel Construction on Grillage Beams Foundation Frame Building

2011 ◽  
Vol 71-78 ◽  
pp. 32-36 ◽  
Author(s):  
Xin Jiang Wei ◽  
Jie Hong ◽  
Gang Wei
Keyword(s):  
Principal Stress ◽  
Differential Settlement ◽  
Shield Tunnel ◽  
Tunnel Construction ◽  
Foundation Settlement ◽  
Ground Settlement ◽  
Shield Tunneling ◽  
Frame Building ◽  
Shield Machine ◽  
The Impact

Considering the interaction of building-soil-tunnel, the grillage beams foundation frame building vertical crossed by Double-O-Tube (DOT) shield tunnel was simulated by 3D MIDAS/ GTS software, and the impact of construction on the building was analyzed. The results show that: the ground settlement trough caused by DOT shield tunnel can be fitted by peck formula; during the passage of the shield tunneling through the building, the settlement of the building increased and settlement trough was wilder; the settlement was stable and had a little rebound when shield machine already passed the building; with the increase of driving distance, the first principal stress P1 increased and then was stable; with the increase of L, the shape of foundation settlement curve changed, and the maximum differential settlement between columns increased but was small.

The Influence of Underpass on Surface Subsidence Caused by Double-Tube Shield Tunneling

2014 ◽  
Vol 915-916 ◽  
pp. 108-113
Author(s):  
Wei Kai Zong
Keyword(s):  
Simulation Method ◽  
Surface Subsidence ◽  
Channel Width ◽  
Ground Movement ◽  
Shield Tunnel ◽  
Underground Structures ◽  
Shield Tunneling ◽  
Underground Channel ◽  
Underground Passage ◽  
The Impact

Shield construction will cause surface subsidence, and the presence of underground structures above the tunnel has an impact on surface subsidence. Based on this, with the engineering of undercross shield tunnel construction on railway station as background, used numerical simulation method to analyze the effect of surface subsidence of underground passage, and studied the influence of depth and width of underpasses on ground movement induced. The results show that: The impact of the underground passage to the wire surface subsidence caused by the shield cannot be ignored. Surface subsidence caused by double shield will be decreased because of the existence of the underground passage, and that related to the channel depth and width. The greater the depth of underground channel, the greater the surface subsidence; greater the underground channel width, the smaller surface subsidence. Meanwhile, the surface subsidence trough width and the largest settlement scope unrelated to the depth of underground tunnels but the underground channel width, and increases with the increasing of the underpass width.

Impact of Double-O-Tube Shield Tunnel Construction on Independent Foundation Frame Building

2011 ◽  
Vol 243-249 ◽  
pp. 3370-3375 ◽  
Author(s):  
Gang Wei ◽  
Jie Hong ◽  
Zhao Lin ◽  
Xin Jiang Wei
Keyword(s):  
Shear Strain ◽  
Principal Stress ◽  
Horizontal Displacement ◽  
Shield Tunnel ◽  
Tunnel Construction ◽  
Shield Tunneling ◽  
Maximum Shear Strain ◽  
Frame Building ◽  
Security Value ◽  
The Impact

Due to its better advantages, Double-O-Tube(DOT) shield has been widely applied in shield tunnel construction. But the impact caused by shield tunnel construction on buildings hasn’t been taken seriously. Considering the interaction of building-soil-tunnel, the independent foundation frame building vertical crossed by DOT shield tunnel was simulated by 3D MIDAS/GTS software, and the impact of construction on the building was analyzed. The results show that: during the passage of the shield tunneling through the building, the settlement of the building increased. The settlement was stable and had a little rebound when shield machine already passed the building. The building’s longitudinal displacement was great larger than lateral horizontal displacement. With the increase of driving distance, the first principal stress P1 and maximum shear strain MSmax increased and then were stable. With the increase of L, the first principal stress P1 and maximum shear strain MSmax tended to gradually reduce the security value, and the maximum differential settlement between columns increased first and then decreased. Finally, the safety of the building was assessed comprehensively.

Research on Key Techniques of Shield Construction in Mixed Ground

2014 ◽  
Vol 513-517 ◽  
pp. 3482-3488 ◽  
Author(s):  
Hong Hao Lu ◽  
Fa Cheng Zhuo ◽  
Yun Bai ◽  
Qiao Song Li
Keyword(s):  
Shield Tunnel ◽  
Underground Space ◽  
Shield Tunneling ◽  
Surrounding Environment ◽  
Ground Conditions ◽  
Mixed Ground ◽  
Technical Features ◽  
Key Techniques ◽  
The Impact ◽  
Specific Section

In underground space development, the technique of shield tunnel construction of metro has been a great challenge when it comes to construction in mixed ground. Against this background, it is significant to research the technical features and the impact on surrounding environment caused by TBM. Based on the engineering case of Nanjing South Station to Lukou airport section of Nanjing Metro Line 6, this paper discusses the new shield tunneling technology Ground Pass Shield Tunneling (GPST) which has been first applied in China. In addition, the numerical analysis of the settlement control of a specific section is also discussed. From this case, suggestions about tunneling in mixed ground are presented to facilitate further utilization of shield method in similar ground conditions.

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.

Research on the Impact of Shield Tunneling on Adjacent Pile Foundation Using FEM

ICPTT 2013 ◽  
2013 ◽  
Author(s):  
X. Y. Hu ◽  
C. He ◽  
Y. C. Jiang ◽  
J. Wang ◽  
H. L. Zheng
Keyword(s):  
Pile Foundation ◽  
Shield Tunneling ◽  
The Impact

scholarly journals Analysis of Construction Impact of A Large Diameter Shield Tunnelling Side-Crossing Viaduct Pile Foundations in Short Distance

2021 ◽  
Author(s):  
Jian Wang ◽  
Zhifang Wen
Keyword(s):  
Finite Element ◽  
Pile Foundation ◽  
Large Diameter ◽  
Bending Moment ◽  
Element Model ◽  
Internal Force ◽  
Pile Foundations ◽  
Lateral Deformation ◽  
Shield Tunneling ◽  
Protection Measures

Abstract The construction of shield tunneling through pile foundation will cause additional deformation and internal force of pile foundation, which will affect the safety and applicability of superstructure. Based on the engineering background of a large-diameter shield (Ф10.9 m) side crossing a viaduct, a three-dimensional finite element model for the construction of large-diameter shield side crossing viaduct pile foundations is established by using the finite element method. The reliability of the numerical model is verified by using the surface subsidence calculated by Peck formula as a reference. Based on this, the viaduct pier and piles additional response during the construction are developed, the analysis results shows that: Because the pile foot of the viaduct is located below the tunnel, the pier deformation during the shield construction is mainly in the transverse direction along the bridge; The deformation of piles is mainly lateral and vertical, and the lateral deformation is S-shaped, the deformation of piles near the tunnel axis is far away from the tunnel side, and the piles at this position has the maximum lateral deformation; The variation characteristics of the additional internal force of piles are similar to the additional deformation, the position of the maximum additional bending moment is consistent with the position of the maximum lateral deformation, while the maximum additional shear force of pile foundation is slightly lower than the tunnel axis. And the protection measures of elevated pile foundation proposed by the project are demonstrated, The calculation results show that the additional deformation of pier and piles has been significantly improved after taking the measures of stratum reinforcement, and its value is far lower than the standard control value.

The Impact of Anglicizing Former German-Language Psychology Journals on Authorship and Citation Frequencies

2012 ◽  
Vol 17 (3) ◽  
pp. 190-198 ◽  
Author(s):  
Günter Krampen ◽  
Thomas Huckert ◽  
Gabriel Schui
Keyword(s):  
Side Effects ◽  
English Language ◽  
General Trend ◽  
Native Language ◽  
Impact Factors ◽  
German Language ◽  
Journal Articles ◽  
Number Of Citations ◽  
The Impact ◽  
Number Of Authors

Exemplary for other than English-language psychology journals, the impact of recent Anglicization of five former German-language psychology journals on (1) authorship (nationality, i.e., native language, and number of authors, i.e., single or multiple authorships), (2) formal characteristics of the journal (number of articles per volume and length of articles), and (3) number of citations of the articles in other journal articles, the language of the citing publications, and the impact factors (IF) is analyzed. Scientometric data on these variables are gathered for all articles published in the four years before anglicizing and in the four years after anglicizing the same journal. Results reveal rather quick changes: Citations per year since original articles’ publication increase significantly, and the IF of the journals go up markedly. Frequencies of citing in German-language journals decrease, citing in English-language journals increase significantly after the Anglicization of former German-language psychology journals, and there is a general trend of increasing citations in other languages as well. Side effects of anglicizing former German-language psychology journals include the publication of shorter papers, their availability to a more international authorship, and a slight, but significant increase in multiple authorships.

When Do Psychopathic Traits Affect Cooperative Behavior?: An Iterated Prisoner's Dilemma Experimental Study

2020 ◽  
Author(s):  
M Testori ◽  
M Kempf ◽  
RB Hoyle ◽  
Hedwig Eisenbarth
Keyword(s):  
Prisoner's Dilemma ◽  
Cooperative Behavior ◽  
Prisoner’S Dilemma ◽  
Selection Procedure ◽  
Psychopathic Traits ◽  
Strong Impact ◽  
Iterated Prisoner's Dilemma ◽  
Human Decision ◽  
The Impact ◽  
Iterated Prisoner’S Dilemma

© 2019 Hogrefe Publishing. Personality traits have been long recognized to have a strong impact on human decision-making. In this study, a sample of 314 participants took part in an online game to investigate the impact of psychopathic traits on cooperative behavior in an iterated Prisoner's dilemma game. We found that disinhibition decreased the maintenance of cooperation in successive plays, but had no effect on moving toward cooperation after a previous defection or on the overall level of cooperation over rounds. Furthermore, our results underline the crucial importance of a good model selection procedure, showing how a poor choice of statistical model can provide misleading results.

Sign in / Sign up

Export Citation Format

Share Document