Research on Construction Technology of Core Rock Erecting Excavation of Double Side Wall-Heading Method in Deep Buried Large Section Metro Station

2019 ◽  
Vol 08 (01) ◽  
pp. 144-152
Author(s):  
木田 黄
Keyword(s):  
Side Wall ◽  
Construction Technology ◽  
Large Section ◽  
Metro Station

Construction Technology of Shallow Pipe- Jacking Working Shaft

2011 ◽  
Vol 480-481 ◽  
pp. 1266-1270
Author(s):  
Liu Hui
Keyword(s):  
Side Wall ◽  
Soil Mass ◽  
Construction Method ◽  
Construction Technology ◽  
Reactive Force ◽  
Small Height ◽  
Key Points ◽  
Pipe Jacking ◽  
Design And Construction

During the pipe jacking construction, the bearing plates of jack need the support of great reactive force which is provided by the side-wall of the working shaft and the soil mass behind the wall. In the shallow pipe-jacking working shaft, the soil mass only can provide limited reactive force due to the small height of the soil mass behind the side-wall, which becomes the difficult point in the design and construction of the shallow pipe-jacking working shaft. This thesis takes the actual projects for the examples to introduce the construction technology of shallow pipe-jacking working shaft in details, including the construction key points like pre-grouting injection consolidation, ring beam construction method as well as reverse construction method.

The Grouting Technology of Large-Section Highway Tunnel in Water-Rich Karst Formations

2013 ◽  
Vol 838-841 ◽  
pp. 1441-1446
Author(s):  
Chao Yue Zhou ◽  
Yong Fang ◽  
Ya Peng Fu ◽  
Ge Cui
Keyword(s):  
Cross Section ◽  
Field Tests ◽  
Operation Technique ◽  
Tunnel Construction ◽  
Construction Technology ◽  
Large Cross Section ◽  
Large Section ◽  
Highway Tunnel ◽  
Grouting Materials

It is a challenge to deal with karst in the construction of large cross-section tunnel. Under the background of Shuangbei Highway Tunnel, a new kind of grouting technology is introduced. According to hydrogeology, field tests are carried out to select grouting materials and proportion of mixture. Combined with the project practice, grouting construction technology is discussed such as grouting equipments, grouting parameters, operation technique, grouting ending standards. It has been proved that the technology is effective in tunnel construction.

scholarly journals Study on Safety Benchmark Value of Monitoring and Early Warning for Large Section Highway Tunnels

2019 ◽  
Vol 136 ◽  
pp. 04024
Author(s):  
Yuwen Wang ◽  
Xiang Yang Cui ◽  
Hongyan Guo ◽  
Ke Li
Keyword(s):  
Side Wall ◽  
Construction Method ◽  
Surrounding Rock ◽  
Large Section ◽  
Deformation Law ◽  
Initial Support ◽  
Under Construction ◽  
Monitoring And Measurement ◽  
Ultimate Displacement ◽  
Wall Method

Taking several tunnels under construction of a highway as the research object, the ultimate displacement of four buried depth sections of 0-50, 50-100, 100-300, 300-500 m in the surrounding rock of grade III, IV and V is numerically simulated by three-step and seven-step excavation method, middle-wall method, cross-middle-wall method and double-side-wall guide pit method for initial support of large-section highway tunnels. Through analysis, the deformation law of tunnel surrounding rock is obtained: under the same buried depth, the displacement ultimate displacement of the two-sided guide pit method and the cross-middle-wall method is the largest, the middle-wall method is the second, and the three-step seven-step excavation method is the smallest. Through the analysis and collation of the measured data obtained by monitoring and measurement of each construction method in the construction site, the surrounding rock deformation datum values of large-span and large-section tunnel under each construction method are obtained.

scholarly journals Numerical Simulation Research of Construction Method for Shallow Buried Large Section Tunnel

2016 ◽  
Vol 10 (1) ◽  
pp. 578-597 ◽  
Author(s):  
Bin Zhu ◽  
Weifeng Kou ◽  
Jiami Xi ◽  
Yanjun Shen
Keyword(s):  
Mechanical Properties ◽  
Side Wall ◽  
Deformation Characteristics ◽  
Large Section ◽  
Simulation Research ◽  
Construction Methods ◽  
Cut Method ◽  
Railway Passenger ◽  
Core Soil ◽  
Stress And Deformation

The background of this paper is based on Deli tunnel of Xi’an to Chengdu Railway passenger dedicated line. In order to compare and optimize this large section tunnel project under different construction methods, General FEA software ANSYS was utilized to simulate and analyze the stress and deformation in 2-D and 3-D. According to the Deli tunnel engineering case, the preliminary comparison and discussion of mechanical properties and deformation characteristics of the construction of bench cut method and two side-wall pilot tunnel method have been carried out. From this simulation, we made the conclusion for different mechanical properties and deformation characteristics in different construction methods. It shows that the two side-wall pilot tunnel method results in less stress and deformation than the bench cut method. Therefore, it is safer to use the former method. The key step for bench cut method is the upper excavation, and the key step for two side-wall pilot tunnel method is the upper core soil excavation. Monitoring and enhanced support of these key areas is imperative to guarantee the smooth construction.

scholarly journals Small Pilot Tunnel Advance and Step Reverse Expansion in Super-Large-Section Tunnel Excavation

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Bole Sun ◽  
Xiaorong Tang ◽  
Yongyi He ◽  
Mingnian Wang
Keyword(s):  
Production Efficiency ◽  
Expansion Method ◽  
Surrounding Rock ◽  
Construction Technology ◽  
Construction Time ◽  
Engineering Project ◽  
Large Section ◽  
Maximum Displacement ◽  
Tunnel Support ◽  
In Situ Conditions

Collapse of the vault and numerous other safety accidents often occur during the construction process of large-section tunnels. The utilization of a small pilot tunnel and a step reverse expansion construction methodology is proposed based on conventional construction methods to explore safe construction technology. First, a theoretical analysis combined with on-site monitoring parameters was conducted. It showed that the maximum displacement of the tunnel surrounding rock was 0.027 m during the elastic stage and increased to 0.031 m during the strength limit stage. The overall surrounding rock deformation does not have a noticeable impact on tunnel safety. A numerical simulation model of the small pilot tunnel advancement and step reverse expansion method was established. Simulation results showed that the first two excavation steps caused 89.6% of the total overlining strata subsidence, and the use of a small pilot tunnel advancement and step reverse expansion method can enhance the tunnel support. The tunnel surrounding rock was adequately stabilized after using this excavation method and provides the in-situ conditions for expanding the pilot tunnel to the large-section tunnel. The proposed method was adopted in an actual engineering project. It protected the subsequent construction of the main tunnel and decreased construction time, saving construction costs while ensuring safety, reducing construction risks, and improving production efficiency. This research can guide similar tunneling projects.

Optimization Principle and Application of Excavation Method for Large Section Metro Station

2021 ◽  
Vol 52 ◽  
pp. 179-190
Author(s):  
Bo Wu ◽  
Wei Huang ◽  
Yu Fang Wu
Keyword(s):  
Cross Section ◽  
Optimization Model ◽  
Three Dimensional ◽  
Longitudinal Section ◽  
Original Design ◽  
Large Section ◽  
Metro Station ◽  
Central Park ◽  
Construction Methods ◽  
Optimization Principle

Developing countries are still in the stage of infrastructure construction. For the reasons of design and economy, it is inevitable to encounter large section tunnel when building subway and expressway in urban construction. Taking the tunnel project of Central Park East Station of Chongqing Metro Line 10 as the case background, the cross-section optimization and process optimization of each section in the construction of extra-large cross-section tunnel are studied. Based on the principle of analogy analysis, the optimization model of the super-large section tunnel is constructed from five aspects: horizontal stratification optimization, horizontal block optimization, plane partition optimization, longitudinal section optimization and three-dimensional block optimization. Finally, a better excavation scheme than the original design is obtained by using the plane optimization model. Therefore, it can be used as a reference for similar projects to optimize tunnel construction methods.

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