Analysis of the ground settlement control of a large span metro station in Dalian city using the Centre Drift Method

This study presents a novel construction pre-supporting system for large underground space excavation with shallow depth, Steel Tube Slab system (STS), in which adjacent steel pipes are connected by a couple of flanges, bolts and concrete for flexural capacity and lateral stiffness of the whole structure. The STS method is employed for the first time for the construction of the ultra-shallow buried and large span subway station in China, during which ground settlement and structural deformation are monitored. A numerical model for the subway station is established with reliability verified by monitored data comparison from numerical results and investigation on the effect of large span underground excavation on surrounding soil surrounding soil and existing buildings in soft soils. Unlike traditional methods, the STS method can effectively control and reduce the ground settlement during construction, thereby rendering it ideally suited for application in soft soils.

Download Full-text

Excavating programme research for shallow large span and double decker metro station

International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts ◽

10.1016/0148-9062(93)92703-s ◽

1993 ◽

Vol 30 (5) ◽

pp. 329

Keyword(s):

Metro Station ◽

Large Span ◽

Double Decker

Download Full-text

Monitoring and statistic analysis on ground settlement of a metro station induced by open-cut construction in Beijing

2011 International Conference on Remote Sensing, Environment and Transportation Engineering ◽

10.1109/rsete.2011.5964763 ◽

2011 ◽

Cited By ~ 1

Author(s):

Xiaofei Liu ◽

Dingtao Kou ◽

Gaoliang Zhao ◽

Mingyue Jin

Keyword(s):

Statistic Analysis ◽

Ground Settlement ◽

Metro Station

Download Full-text

Experimental Analysis of Deformation Mechanics and Stability of a Shallow-Buried Large-Span Hard Rock Metro Station

Advances in Civil Engineering ◽

10.1155/2020/4031306 ◽

2020 ◽

Vol 2020 ◽

pp. 1-11

Author(s):

Wei Li ◽

Jiwen Bai ◽

Kexian Li ◽

Shijie Zhang

Keyword(s):

Model Test ◽

Large Scale ◽

Hard Rock ◽

Surrounding Rock ◽

Rock Masses ◽

Three Dimensional Model ◽

Metro Station ◽

Large Span ◽

Deformation Mechanics ◽

Primary Support

Based on a certain Qingdao metro station, a large-scale three-dimensional model test has been carried out to investigate the stability of the surrounding rock masses (hard rock) and a large-span metro station under different excavation methods and technologies. The model test includes an entire section excavation, an arch-cover excavation, and a primary support arch-cover excavation. Compared with the entire section excavation, the primary support arch-cover method can effectively control the vault settlement and clearance convergence deformation of the surrounding rock masses, reducing them by 15–30%. The deformation itself goes through three stages: slow, abrupt, and stable. The excavation of the “middle hole” creates a drastic change in the tunnel vault during the arch-cover excavation; however, the timely application of supports can effectively constrain the range of disturbance caused by the excavation and weaken the degree of load agglomeration of the surrounding rock masses.

Download Full-text

Research on Shallow Buried and Large-Span Tunnelling Undercrossing a Highway

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.90-93.1748 ◽

2011 ◽

Vol 90-93 ◽

pp. 1748-1756

Author(s):

Chun Yang Liu ◽

Jian Li ◽

Zhong Sheng Tan

Keyword(s):

Ground Settlement ◽

Safety Requirement ◽

Large Span ◽

Tunnel Section ◽

Monitoring Result ◽

Soil Settlement ◽

Security And Reliability ◽

Core Soil ◽

Primary Support ◽

Excavation Area

WenXiang tunnel ,one of the tunnels constructed for the ZhengXi Special passenger Railway in china. In this project we have carried out a series of research on optimizing the construction method for shallow and large-span tunnels in loess condition. According to the field monitoring of ground settlement, vault settlement and primary support stress of the tunnel section before tunnelling underneath the LianHuo Highway, the result indicates that soil settlement and primary support stress can not be controlled very well, and current construction program needs to be reformed since it can not meet construction safety requirement. Our synthetical analysis comprises the optimized methods have been used in construction, such as reducing excavation area, increasing excavation steps of pilot tunnel, reserving core soil, closing invert punctually, reinforcing primary support, etc. The security and reliability also has been verified by numerial analysis sofeware FLAC3D. From feedback of field implement and monitoring result, the effect of optimized method is significant; and all of these methods ensured this tough project implemented successfully. These results derived from our research are subject to a ceritain value that could be referred for future analogous project , in terms of controlling soil settlement and protecting surrouding building facilities.

Download Full-text

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

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.90-93.2143 ◽

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.

Download Full-text