scholarly journals Optimal Analysis of Tunnel Construction Methods through Cross Passage from Subway Shaft

2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
Zhanping Song ◽  
Zhilin Cao ◽  
Junbao Wang ◽  
Shoufeng Wei ◽  
Shichun Hu ◽  
...  
Keyword(s):  
Surface Deformation ◽  
Construction Method ◽  
Structural Deformation ◽  
Tunnel Construction ◽  
Underground Excavation ◽  
Optimal Analysis ◽  
Construction Methods ◽  
Tunnel Section ◽  
The Cross ◽  
Surface Settlements

The conversion section of the cross passage and shaft is a priority concern in the stress transformation of a tunnel structure during subway underground excavation. In the construction of Subway Line 5 in Xi'an, China, the main line in the loess layer was constructed through the cross passage from the subway shaft of the Yue Deng Pavilion–San Dian Village Station tunnel section. Numerical simulation and field measurement were adopted to study the construction stability of the cross passage and shaft under two possible construction methods: the “shaft followed by cross passage construction” method and the “cross passage parallel shaft construction” method. The results showed that the surface deformation and plastic zone of the surrounding rock are similar under the two construction methods. However, of the two, the “cross passage parallel shaft construction” method was more advantageous in controlling the structural deformation of the original shaft and the stress distribution of the horsehead structure. The field monitoring data showed that the surface settlements and the deformation of the original shaft structures meet the requirement of control standards under the “cross passage parallel shaft construction” method.

The Comparison of Tunnel Engineering Construction Methods for Renhechang Tunnel Crossing Underneath Existing Tunnel on Lanzhou-Chongqing Railway

2013 ◽  
Vol 405-408 ◽  
pp. 1330-1333 ◽  
Author(s):  
Chuan Yi Sui ◽  
Xu Dong Zhou ◽  
Lin Hui Wang
Keyword(s):  
Field Measurement ◽  
Measurement Data ◽  
Tunnel Construction ◽  
Tunnel Engineering ◽  
Engineering Construction ◽  
Existing Structures ◽  
Construction Methods ◽  
Tunneling Method ◽  
Simulation Results ◽  
The Cross

Problems often exist in construction of transportation tunnels, such as the effect of new tunnels constructed close to existing structures. Solving this magnificent problem by carefully choosing tunnel construction methods will be beneficial to minimize effects on existing structures while ensuring the newly constructed tunnel is both time-consuming and economical. Three representative engineering methods-the benching tunneling method, the Center Diaphragm method and the Cross Diaphragm method-are compared in controlling the settlement of new tunnel vault and the deformation of the existing tunnel. Finally checking the simulation results by comparing with field measurement data.

scholarly journals Numerical analysis and application of the construction method for the small interval tunnel in the turn line of metro

2020 ◽  
Vol 103 (3) ◽  
pp. 003685042093206 ◽  
Author(s):  
Zhanping Song ◽  
Xiaoxu Tian ◽  
Qi Liu ◽  
Yuwei Zhang ◽  
Heng Li ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Numerical Analysis ◽  
Construction Method ◽  
Surface Settlement ◽  
Underground Excavation ◽  
Small Interval ◽  
Resource Configuration ◽  
Construction Methods ◽  
Initial Support ◽  
Left And Right

The surrounding rock may become unstable or even fall down and the initial support may crack and be destroyed when the construction method of the underground excavation tunnel is not properly selected in the turn line of metro. . A section of the Santunbei turn line of Urumqi Metro Line 1# was taken as the engineering background. The proposed construction method was analyzed by numerical simulation. Numerical analysis shows that the final surface settlement caused by the proposed construction method is 3.0 mm and the horizontal convergence is 3.2 mm. It also turns out that the proposed construction method causes less deformation, and the method can be applied to the construction of the small interval tunnel in the Santunbei turn line of metro. The rationality of the method and numerical model was further verified by comparison between the monitored data of surface settlement, horizontal convergence and vault sinking, and numerical simulation results. Finally, the deformation and stress of the six construction methods were compared. The deformation and stress caused by the six construction methods are almost the same. It indicates that the construction spacing between the left and right tunnels does not affect the safety of tunnel construction. Therefore, the appropriate construction spacing could be selected according to the resource configuration, instead of deformation and stress.

scholarly journals Study on Identification of Construction Method for Ultra-Large-Span Tunnel

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Xu Chongbang ◽  
Qin Youlin
Keyword(s):  
Rock Strength ◽  
Construction Method ◽  
Surrounding Rock ◽  
Orthogonal Test ◽  
Tunnel Construction ◽  
Test Model ◽  
Large Span ◽  
Construction Methods ◽  
The Stability

Although the determination of tunnel construction methods is extremely critical for the construction of ultra-large-span tunnels, the determination of construction methods is still at a qualitative level, which relies on the engineering experience of on-site technicians and lacks rigorous and systematic theoretical basis and technical standards. By means of orthogonal test method, the proper construction method was established for the deep-buried ultra-large-span tunnel where the tunnel excavation span, tunnel surrounding rock strength, and rock integrity coefficient were set as the main control factors. The stability of tunnel surrounding rock under various test conditions was quantified according to the plastic zone properties calculated by the three-factor and five-level orthogonal test model. Meanwhile, the macro form and quantitative method of test combinations under different levels of various factors were proposed to obtain the influence of each factor on the stability of tunnel surrounding rock, and thus the functional relations between various factors and tunnel stability were obtained. On this basis, the identification and the criterion of the ultra-large-span tunnel construction method were established, which can quantitatively reflect the contribution of excavation span of the tunnel, the number of lateral drifts in cross section, surrounding rock strength, and rock integrity coefficient to surrounding rock stability of the tunnel. The construction method calculation results of the Malin tunnel, a practical underground project, are obtained according to the orthogonal test model calculation. Based on the method, Malin tunnel can be constructed safely and efficiently. The research results could provide the theoretical basis for the identification and selection of construction method for ultra-large-span tunnel.

Research on Construction Methods Affecting on Stress and Strain Distribution of Double Arch Tunnel

2012 ◽  
Vol 256-259 ◽  
pp. 1308-1311
Author(s):  
Qing Yang Yu ◽  
Hong Yan Zhang ◽  
Xue Da Guo
Keyword(s):  
Mathematical Model ◽  
Stress Distribution ◽  
Strain Distribution ◽  
Construction Method ◽  
Tunnel Construction ◽  
Stress And Strain ◽  
Construction Methods ◽  
Stress Changes ◽  
Stress And Strain Distribution

This paper presents the stress and strain distribution and change during the tunnel construction, and the stress and strain are compared with different construction methods. Mathematical model was firstly introduced. Then the stress and the strain during the up tunnel construction from two methods were compared. The historical stress and strain curves of key node of tunnel during the tunnel construction were analyzed. The different stress changes from different construction methods were compared. We can get the conclusion that the construction method affects the stress distribution and change.

scholarly journals Tailings facility disclosures reveal stability risks

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Daniel M. Franks ◽  
Martin Stringer ◽  
Luis A. Torres-Cruz ◽  
Elaine Baker ◽  
Rick Valenta ◽  
...  
Keyword(s):  
Information Disclosure ◽  
Significant Risk ◽  
Construction Method ◽  
Facility Management ◽  
Alternative Technologies ◽  
Construction Methods ◽  
Comprehensive Survey ◽  
Engineering Standards ◽  
The Right ◽  
Stability Issues

AbstractTailings facility failures represent a significant risk to the environment and communities globally, but until now little data was available on the global distribution of risks and characteristics of facilities to ensure proper governance. We conducted a survey and compiled a database with information on tailings facilities disclosed by extractive companies at the request of institutional investors. Despite limitations in the data, this information disclosure request represents the most comprehensive survey of tailings facilities ever undertaken. The compiled dataset includes 1743 tailings facilities and provides insights into a range of topics including construction method, stability, consequence of failure, stored volume, and the rate of uptake of alternative technologies to dewater tailings and reduce geotechnical risk. Our analysis reveals that 10 per cent of tailings facilities reported notable stability concerns or failure to be confirmed or certified as stable at some point in their history, with distinct trends according to construction method, governance, age, height, volume and seismic hazard. Controversy has surrounded the safety of tailings facilities, most notably upstream facilities, for many years but in the absence of definitive empirical data differentiating the risks of different facility types, upstream facilities have continued to be used widely by the industry and a consensus has emerged that upstream facilities can theoretically be built safely under the right circumstances. Our findings reveal that in practice active upstream facilities report a higher incidence of stability issues (18.3%) than other facility types, and that this elevated risk persists even when these facilities are built in high governance settings. In-pit/natural landform and dry-stack facilities report lower incidence of stability issues, though the rate of stability issues is significant by engineering standards (> 2 per cent) across all construction methods, highlighting the universal importance of careful facility management and governance. The insights reported here can assist the global governance of tailings facility stability risks.

Continuous Belt Mucking Technology of China Railway Tunnel Construction

2012 ◽  
Vol 268-270 ◽  
pp. 664-672
Author(s):  
Ya Ting Sun ◽  
Zhi Rong Mei ◽  
Jun Wei Zhang
Keyword(s):  
Conservation Policy ◽  
The Other ◽  
Tunnel Construction ◽  
Frozen Ground ◽  
Railway Tunnel ◽  
Scheme Design ◽  
Construction Methods ◽  
Comprehensive Benefit ◽  
Equipment Configuration ◽  
Blasting Method

The conventional mucking system of tunnel construction in China has a series of deficiencies and stubborn problems. Tunnel mucking technologies matched with different tunnel construction methods have been analyzed systematically and the continuous belt mucking methodology which is appropriated with drilling-blasting method was presented. The continuous belt mucking technology includes mucking scheme design and mucking equipment configuration. Compared with the conventional mucking methods, the comprehensive benefit can be fully demonstrated by the new continuous belt mucking system. On the other hand, the predominance on environmental protection of the continuous belt mucking technoloty matches up with the conservation policy. The technology would be widely applied in long tunnels and tunnels embedded in frozen ground and located in bitter cold plateau. The economic benifis and contribution to society of continuous belt mucking technology would be remarkable.

Bridge bearing solutions that facilitate quick and efficient bearing installation and bridge construction

2019 ◽  
Author(s):  
Simon Hoffmann ◽  
Amit Kutumbale ◽  
Danilo Della Ca'
Keyword(s):  
Load Distribution ◽  
Construction Method ◽  
Construction Process ◽  
Vital Function ◽  
Bridge Construction ◽  
Construction Methods ◽  
Efficient Construction ◽  
Critical Components ◽  
Bridge Bearing ◽  
Segmental Bridge

<p>A bridge’s bearings, arguably its most critical components, perform a vital function throughout the bridge’s service life, but the bearings used can also have a significant impact on the bridge construction process. Suitably designed adjustable bearings are an integral part of the incremental launch method of bridge construction, for instance, which can be a very efficient construction method. Adjustable bearings may also support other bridge construction methods, such as segmental bridge construction, where fixities/freedoms that applied during the construction phase require to be changed before the bridge enters service. Lifting bearings, the height of which can be increased, may enable a lack of precision in the structure to be tolerated, and measuring bearings may enable load distribution during bridge construction to be verified, where this is required by the construction method. Design features of otherwise standard bearings that support quick and high-quality installation can also contribute towards the efficiency of the overall bridge construction process, as can the use of bearing designs which minimize bearing size. Bearing solutions and features that facilitate bearing installation and bridge construction in ways such as these are described.</p>

Deformation Monitoring and Data Analysis for Metro Construction with Mining Method in Dalian

2013 ◽  
Vol 353-356 ◽  
pp. 1604-1608
Author(s):  
Guang Bin Bai ◽  
Jie Zhao ◽  
Li Sheng Liu
Keyword(s):  
Data Analysis ◽  
Construction Method ◽  
Deformation Monitoring ◽  
Monitoring Data ◽  
Ground Subsidence ◽  
Tunnel Construction ◽  
Mining Method ◽  
Construction Process ◽  
Subway Tunnel ◽  
The Future

Based on a subway tunnel construction, the construction method was introduced. The ground subsidence, crown settlement and convergence displacement caused by the cut tunnel are monitored during the tunneling construction and the results of monitoring data for them are analyzed. This technology wells to guide the tunnel-entering construction effectively and avoid the tunnel-entering construction process prone to landslides, thus ensuring the safety of the tunnel construction and will guiding the future construction.

scholarly journals Discussion on construction methods and precautions of building water supply and drainage

2018 ◽  
Vol 2 (2) ◽  
Author(s):  
Guoliang Yu ◽  
Fan Fan Yang ◽  
Li Li Li ◽  
Zhenfeng Zhenfeng Li ◽  
Zhenlong Shi
Keyword(s):  
Water Supply ◽  
Construction Project ◽  
Construction Method ◽  
Construction Quality ◽  
Strong Function ◽  
Construction Enterprises ◽  
Construction Methods ◽  
Quality Of Water

As an important construction link in the construction project, the quality of the water supply and drainage directly affects the overall quality of the construction project. Because of the strong function of the water supply and drainage project, the construction quality is easily affected by the construction method. For this reason, construction enterprises should attach importance to the mastery of water supply and drainage construction methods. And further understand the relevant precautions of construction water supply and drainage construction, in order to achieve the purpose of improving the quality of water supply and drainage construction. 

B2P Rutaka Footbridge – Improving Safety using Innovative Deck Pull Method

2018 ◽  
Author(s):  
Ian Towler ◽  
Ben Mills ◽  
Matthew Lofts ◽  
Brandon Mills ◽  
William Benson
Keyword(s):  
Quality Control ◽  
Rural Communities ◽  
Developing Nations ◽  
Construction Method ◽  
River Bank ◽  
Construction Methods ◽  
Health Clinics ◽  
Significant Step ◽  
Safe Access

<p>In developing nations, rural communities often lack year-round safe access to local markets, farms, schools, health clinics and other critical services. Bridges to Prosperity has developed standard footbridge designs and construction methodologies to successfully construct over 200 footbridges.</p><p>This paper presents a case study of the 40m long suspended footbridge constructed in the community of Rutaka in Rwanda in 2017. The normal deck construction method required the operatives to spend a significant amount of time working at height. The industry team set themselves a challenge to reduce this.</p><p>The team successfully developed and trialled a methodology for launching the deck from a platform on the river bank, improving safety and quality control. It is a significant step forward in the development of safety and construction methods for Bridges to Prosperity.</p>

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