Preliminary Ideas of the Metro Station Constructed by Shield Tunneling Method Combined with Prefabricated Method

2014 ◽  
Vol 580-583 ◽  
pp. 1013-1018 ◽  
Author(s):  
Hui Feng Su ◽  
Wei Ning Liu ◽  
Fu Chun Liu
Keyword(s):  
The Other ◽  
Shield Tunnel ◽  
Spring Stiffness ◽  
Underground Engineering ◽  
Shield Tunneling ◽  
Metro Station ◽  
Key Technology ◽  
Tunneling Method ◽  
Assembly Technology ◽  
Northeast Of China

Confronting with the difficulties of the construction metro station in the Northeast of China, a new idea of shield method combined prefabricated method is put forward. In the paper the research status of the underground engineering precast assembly technology was analyzed and classified firstly. The method of single round interval shield combined with open-cut (or covered excavation) prefabricated sections and on the basis of shield tunnel to build single arch station is especially worth studying and promotion. Then the key prefabricate theory needing to deal with such as how to calculating the spring stiffness and so forth of the calculating model. The key technology such as joint formation, waterproof and the other of shield method combined with prefabricated method was discussed.

Numerical Analysis of Metro Station Construction by Large-Diameter Shield and Pile-Beam-Arch Method

2011 ◽  
Vol 368-373 ◽  
pp. 2711-2715 ◽  
Author(s):  
De Yun Ding ◽  
Xiu Ren Yang ◽  
Wei Dong Lu ◽  
Wei Ning Liu ◽  
Mei Yan ◽  
...  
Keyword(s):  
Ground Deformation ◽  
Large Diameter ◽  
Element Model ◽  
Construction Method ◽  
Shield Tunnel ◽  
Outer Diameter ◽  
Shield Tunneling ◽  
Metro Station ◽  
Dimensional Finite Element ◽  
New Construction

In more and more complicated urban building environment, a new construction method that metro engineering is constructed by large-diameter shield and shallow mining method can be regarded as a great attempt in China. By taking the Gaojiayuan station of Beijing metro line 14 as an engineering background, the main construction steps for the platform of the metro station built by a large-size shield with an outer diameter of 10 m and the Pile-Beam-Arch (PBA) method are introduced. Based on the soil-structure interaction theory, a two-dimensional finite element model is used to simulate the shield tunneling and the platform construction by the PBA method to enlarge the shield tunnel. The ground deformation and structural stress of the platform are predicted. The numerical results can be regarded as a valuable reference for the application of the new construction method in Beijing metro line 14.

Numerical Simulation of Shield Tunnel Passing Through Underground Structure

2011 ◽  
Vol 105-107 ◽  
pp. 886-891
Author(s):  
Yong Suo Li ◽  
Ke Neng Zhang ◽  
Mei Long Deng ◽  
Chang Bo Huang
Keyword(s):  
Numerical Simulation ◽  
Underground Structure ◽  
Frame Structure ◽  
Shield Tunnel ◽  
Engineering Practice ◽  
Underground Engineering ◽  
Shield Tunneling ◽  
Tunnel Excavation ◽  
Mine Excavation ◽  
End Wall

Shield tunneling is often adopted in underground engineering such as civil tunnel construction and mine excavation. The program FLAC3D is used to simulate the process of the tunnel excavation through underground structure in Shenyang in this paper. The analysis results show that,(1) the soil below the end wall suffers great displacement, when the shield approaches the end wall of underground framework from different directions, so the soil under the end wall needs to be reinforced. (2) Increasing pressure and volume of grouting can’t significantly reduce the amount of surface subsidence when the drilling of the shield acrosses through the independent foundation. (3) The influences of shielding to the construction are limited because of the constraint function to the surrounding rock above the tunnel by the great entire rigidity of under-ground framework. The results of numerical simulation exactly matches the monitoring data when the stiffness of under-ground frame structure is considered, and it can provide guidance for engineering practice.

scholarly journals An Improved Method for Predicting the Greenfield Stratum Movements Caused by Shield Tunnel Construction

2019 ◽  
Vol 9 (21) ◽  
pp. 4522 ◽  
Author(s):  
Tan ◽  
Zhang ◽  
Zhang ◽  
Zhu ◽  
Tu
Keyword(s):  
Three Dimensional ◽  
Elastic Half Space ◽  
Shield Tunnel ◽  
Theoretical Formula ◽  
Tunnel Construction ◽  
Underground Structures ◽  
Underground Engineering ◽  
Shield Tunneling ◽  
Deep Soil ◽  
Contour Maps

Shield tunneling is becoming the preferred construction scheme for metro construction because of its advantages of fast construction speed and small disturbance. However, limited by process defects, the stratum movements induced by the construction of shield tunnels still affects the safety of nearby underground structures and aboveground buildings. Therefore, the reliable prediction of stratum movements is important. Described in this paper is an analysis method of the Greenfield stratum movements (Greenfield is an area of land that has not yet had buildings on it, stratum movements means the movement of various soil layers) caused by shield tunnel construction combining an elastic half-space model of mirror source–sink method with the use of modified analytical method. Based on the theoretical formula in this paper, not only can the curve of surface settlement trough be calculated, but also the three-dimensional displacement field of deep soil can be obtained. By comparing vertical and horizontal contour maps of Greenfield stratum movements, good consistency between theoretical formula results and centrifugal test results are shown. This solves the defects and limitations of existing two-dimensional formulas; furthermore, based on this, it is convenient to evaluate the effect on the other skewed underground structures through the elastic foundation beam and other similar methods; therefore, this paper can provide a wide guidance and service for the design and construction of underground engineering in the future.

Ground Treatment and its Application in Shallow Subway Tunnel Crossing Urban River by Shield Tunneling Method

2014 ◽  
Vol 919-921 ◽  
pp. 853-856 ◽  
Author(s):  
Xiao Jun Zhou
Keyword(s):  
Surrounding Rock ◽  
Shield Tunnel ◽  
Great Success ◽  
Treatment Technique ◽  
Subway Tunnel ◽  
Shield Tunneling ◽  
Ground Treatment ◽  
Reinforced Concrete Slabs ◽  
Tunneling Method ◽  
Shallow Subway

On the basis of the geological and environmental conditions of surrounding rock around a shallow subway tunnel used to cross a river in Chengdu subway line one, the ground treatment technique such as uplift piles, cast-in-place reinforced concrete slabs and site grouting have been summarized in the paper. The riverbed above shallow shield tunnel is reinforced with covering slabs and uplift piles; meanwhile, the surrounding rock is reinforced with cement and sodium silicate grout by high pressure grouting method conducted inside the tunnel. The practice of the scenario presented in the paper turns out to be a great success and shows that the treatment technique can be used to guide the design and construction of ground reinforcement for shallow tunnel used to cross urban rivers in subway lines by shield tunneling method under similar conditions.

Improvements on Technologies of Shield Tunnel Construction in Sandy Soil

2012 ◽  
Vol 226-228 ◽  
pp. 957-962
Author(s):  
Zhan Wang ◽  
Guan Shui Liu ◽  
Fan Long ◽  
Fei Zheng
Keyword(s):  
Sandy Soil ◽  
Ventilation System ◽  
Cooling Water ◽  
Conveyor Belt ◽  
Shield Tunnel ◽  
Circulation System ◽  
Tunnel Construction ◽  
Shield Tunneling ◽  
Tunneling Method ◽  
Water Circulation System

With development of underground space, the shield tunneling method have been widely adopted due to its unique advantages. However, there is still many technical and theoretical problems need to be improved in the construction. Based on the project of metro line 1 in Hangzhou city, typical problems of shield tunnel construction in sandy soil are analyzed. The problems of ventilation system, cooling water circulation system, foaming system and conveyor belt system are represented in detail. Controlling of proper propelling force is optimized by parameter sensibility analysis. Aiming at these problems, improvement measures are proposed and successfully used in the project. The improvements can be taken for reference in similar projects.

Research of Affection to the Ground on the Metro Station Driven with Enlarging Shield Tunnels

2011 ◽  
Vol 90-93 ◽  
pp. 2143-2146
Author(s):  
Zhan Rui Wu ◽  
Tai Yue Qi ◽  
Lin Zhong
Keyword(s):  
Numerical Simulation ◽  
Construction Method ◽  
Shield Tunnel ◽  
Ground Settlement ◽  
Step Method ◽  
Shield Tunneling ◽  
Metro Station ◽  
Adjacent Buildings ◽  
The Future

The construction schemes of metro station driven with enlarging shield tunnels based on the shield tunnel in the upper and lower step method of artificial were first used in the dongshankou station of Guangzhou Metro Line VI and applied successfully in practice. This paper analyses and studies comprehensively the affection to the ground on the metro station driven with enlarging shield tunnels through numerical simulation. The study in this paper is mainly considered the ground settlement and movement when enlarging shield tunneling in the left tunnel. The ground settlement and movement up to a certain extent will affect the safety of the above adjacent buildings. This paper will provide some guidance to the application of this construction method in the future.

The Major Problems and Countermeasures on the Shield Machine Tunneling in the Hard Rock Stratum

2011 ◽  
Vol 105-107 ◽  
pp. 1438-1442 ◽  
Author(s):  
Kai Rong Hong ◽  
Ren Hua Yang
Keyword(s):  
Hard Rock ◽  
Rapid Development ◽  
Soft Rock ◽  
Shield Tunnel ◽  
Tunnel Construction ◽  
Construction Technology ◽  
Construction Costs ◽  
Shield Tunneling ◽  
Rock Stratum ◽  
Tunneling Method

With the rapid development of urban construction, the shield construction technology has been greatly developed. Shield tunneling method generally adapts to relatively uniform soil, soft rock and sand rock strata, and the shield tunnel construction has been more mature for the homogeneous strata. However, for the soft and hard interbedded strata, how to solve the problems of breaking the hard rock, increasing the tunneling efficiency and reducing the construction costs, are difficult problems in the shield tunnel construction. In this paper, based on a great deal of theoretical analyses and engineering practices, the effective methods of improving the efficiency of tunneling, reducing cutter wearing and decreasing the construction costs in the process of the shield tunneling construction in hard rock and gravel layer are proposed.

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.

An Inverse Force Analysis of a Planar Two-Spring System

1994 ◽  
Author(s):  
Thomas M. Pigoski ◽  
Joseph Duffy
Keyword(s):  
The Other ◽  
Spring Stiffness ◽  
Force Analysis ◽  
Degree Polynomial ◽  
Real Solutions ◽  
Variable Elimination ◽  
Spring System ◽  
The Common ◽  
Resultant Length ◽  
Inverse Force

Abstract A closed-form inverse force analysis was performed on a planar two-spring system. The two springs were grounded to pivots at one end and attached to a common pivot at the other. A known force was applied to the common pivot of the system, and it was required to determine all of the assembly configurations. By variable elimination, a sixth degree polynomial in the resultant length of one spring was derived, and from this, six real solutions of the point of application of force were obtained. Following this, the applied force was incremented along a line and the six paths of the moving pivot were tracked starting from the zero-load configurations. An analysis of these results showed stability phenomena indicating the workspace of this system contained regions of negative spring stiffness and points of catastrophe.

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