STUDY ON LONGITUDINAL DEFORMATION MECHANISM OF CUT AND COVER SUBWAY TUNNEL DUE TO GROUND SETTLEMENT

2020 ◽  
Vol 76 (1) ◽  
pp. 14-31
Author(s):  
Satoshi ITO ◽  
Shinji KONISHI ◽  
Tetsuya MURAKAMI ◽  
Hiroki NITTA ◽  
Kenichi ANAN ◽  
...  
Keyword(s):  
Deformation Mechanism ◽  
Ground Settlement ◽  
Longitudinal Deformation ◽  
Subway Tunnel

Calculation Model for Ground Settlement Process of Xi’an Subway Tunnel Non-Synchronous Excavation with Double-Line

2011 ◽  
Vol 90-93 ◽  
pp. 2221-2225
Author(s):  
Fang Tao She ◽  
Sheng Jun Shao ◽  
Juan Fang ◽  
Yang Yang Jiao
Keyword(s):  
Control Function ◽  
Calculation Model ◽  
Ground Settlement ◽  
Subway Tunnel ◽  
Tunnel Excavation ◽  
Probability Curve ◽  
Double Line ◽  
Building Foundation ◽  
Current Calculation ◽  
Calculation Models

The current calculation models of ground settlement for tunnel excavation cannot reflect ground settlement of tunnel non-synchronous excavation with double-line. Based on the Peck ground settlement formula and Attewell ground settlement formula, displacement release of excavation place and tunnel non-synchronous excavation with double-line have researched. By means of finding a function to replace the accumulated probability curve, the new control function was beneficial to parameter introduced and improvement of the current ground settlement formula. By introducing the non-synchronous excavation distance and the displacement release coefficient of excavation place, A new calculation model for ground settlement process of tunnels non-synchronous excavation with double-line is proposed. The reliability and practical of the calculation models was verified. Research results were very important to analyze the ground settlement affecting the building foundation and pipe under ground.

scholarly journals Deformations of Subway Tunnels Induced by the Overcrossing Jacked Box Tunnels

Symmetry ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1800
Author(s):  
Wei Liu ◽  
Yinlong Wu ◽  
Huajing Zhao ◽  
Xiangyang Xu ◽  
Lingyi Miao
Keyword(s):  
Numerical Simulation ◽  
Urban Areas ◽  
In Situ Measurements ◽  
Longitudinal Deformation ◽  
Subway Tunnel ◽  
Numerical Result ◽  
The Right ◽  
Subway Tunnels ◽  
Uplift Deformation

The rectangular utility tunnels have been increasingly built in urban areas in recent decades. In this paper, a case of jacked box tunnels built closely over-crossing the existing subway tunnels in Suzhou, China, is presented. The tunneling-induced deformation of the subway tunnels is measured and analyzed. The measurement indicates that the subway tunnels are uplifted and subjected to the overcrossing box tunneling. As compared, the longitudinal deformation of the range that locates under the box tunnels is more significant than that outside the range. The tunneling-induced deformation of the left subway tunnel is relatively higher than that of the right one. The numerical simulation is performed for validation. The numerical result is agreed with the in-situ measurements. Moreover, the simulation reveals that the presence of friction in jacked tunnels causes the extra uplift deformation of subway tunnels. The higher the friction, the is the deformation. It is affirmed that using the effective lubrication not only facilitates the tunnel jacking but also inabilities the tunneling-induced deformation of underlying tunnels.

scholarly journals Force and deformation mechanism of great pipe shed advanced support in subway tunnel

2019 ◽  
Vol 330 ◽  
pp. 022035
Author(s):  
Lidan Li ◽  
Dengkai Liu ◽  
Yinghong Zhen ◽  
Zhaoxiang Liu
Keyword(s):  
Deformation Mechanism ◽  
Subway Tunnel ◽  
Advanced Support

scholarly journals Risk Control Standard and Construction Control Technology of Shield Tunnel Passing through Irregular-Plate Bridge

Symmetry ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1331
Author(s):  
Yougang Hu ◽  
Ping He
Keyword(s):  
Risk Control ◽  
Shield Tunnel ◽  
Foundation Settlement ◽  
Control Technology ◽  
Ground Settlement ◽  
Subway Tunnel ◽  
Feasible Method ◽  
Key Points ◽  
The Relationship ◽  
Beijing Subway

As a kind of statically-indeterminate point-support structure, the irregular-plate bridge (IPB) is extremely sensitive to the settlement of pier columns, and the stress of the plate is complicated. Because of the limitation of environmental conditions, the newly-built subway circular symmetric shield tunnel needs to pass the pier foundation of the IPB perpendicularly. To control the engineering risks, the pier settlement value must be known, and measures should be taken to reduce the settlement. This paper takes the project of the Beijing subway circular symmetric shield tunnels passing the existing IPB of the Guang’anmen Bridge as an example. First, the stress characteristics and settlement control standards of the IPB are analyzed, and then the technical scheme of synchronous jacking and key points of risk control during the construction of the shield passing the IPB are put forward. The relationship between the excavation face pressure of the shield tunnel and pier foundation settlement, and the ground settlement, are then analyzed. Finally, structural cracking after construction is analyzed, and the analysis shows that synchronous jacking technology can effectively control the settlement value of the subway tunnel passing the IPB. The technology is a feasible method for controlling the safety of a tunnel passing through a sensitive, statically-indeterminate bridge, and this work is a successful experience for similar major risk projects.

Analysis on Surface Settlement Caused by Soil Pressure in the Chamber of Shield-Tunneling

2012 ◽  
Vol 446-449 ◽  
pp. 322-325
Author(s):  
Hai Xia Sun ◽  
Wen Zhao ◽  
Qi Zhou ◽  
Zhao Zhang
Keyword(s):  
Earth Pressure ◽  
Good Control ◽  
Progressive Increase ◽  
Ground Settlement ◽  
Subway Tunnel ◽  
Soil Pressure ◽  
Shield Tunneling ◽  
Element Simulation ◽  
Set Up ◽  
The Cost

Soil Pressure in the chamber is one of the important construction parameters. It is very important to set up reasonable soil Pressure in the chamber for controlling the ground settlement, promoting the peed of drift and lowering the cost of drifting. Take some subway tunnel for example, and carry out the 3D finite element simulation. In order to investigate the influence on ground settlement from soil pressure in the chamber, take 15% of the progressive increase in earth pressure to simulate over-balance conditions and also take 15% of the progressive decrease in earth pressure to simulate under-balance conditions. The results indicated that while the soil pressure achieves equilibrium, the swell and the settlement are all small. While over-equilibrium, the swell increases, on the contrary, the settlement increases while under-equilibrium. So, a good control over the soil pressure is one of the most effective therapies for decreasing the ground settlement.

QUASI--SUPERPLASTICITY AND DEFORMATION MECHANISM OF ULTRALIGHT β SOLID SOLUTION Mg--11Li--3Zn ALLOY

2013 ◽  
Vol 48 (2) ◽  
pp. 250-256 ◽  
Author(s):  
Furong CAO ◽  
Hua DING ◽  
Zhaodong WANG ◽  
Yinglong LI ◽  
Renguo GUAN ◽  
...  
Keyword(s):  
Solid Solution ◽  
Deformation Mechanism
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