The environmental impact of rock support for road tunnels: The experience of Norway

2020 ◽  
Vol 712 ◽  
pp. 136421
Author(s):  
Lizhen Huang ◽  
Pål Drevland Jakobsen ◽  
Rolf André Bohne ◽  
Yongping Liu ◽  
Amund Bruland ◽  
...  
Keyword(s):  
Environmental Impact ◽  
Rock Support ◽  
Road Tunnels

scholarly journals A Global Perspective for Sustainable Highway Tunnel Lighting Regulations: Greater Road Safety with a Lower Environmental Impact

2018 ◽  
Vol 15 (12) ◽  
pp. 2658 ◽  
Author(s):  
Antonio Peña-García ◽  
Thi Nguyen
Keyword(s):  
Environmental Impact ◽  
Traffic Safety ◽  
Road Safety ◽  
Well Being ◽  
Global Perspective ◽  
Highway Tunnel ◽  
Road Tunnels ◽  
European Regulations ◽  
Regulatory Bodies ◽  
The Impact

Tunnel lighting installations function 24 h a day, 365 days a year. These infrastructures have increased exponentially and now connect quite distant locations, even on different continents. This has led European administrations and international regulatory bodies to establish regulations for tunnel safety with the lowest environmental impact. However, until now, these regulations have almost exclusively focused on traffic safety, and relegated sustainability to the background. Even though they recognize the need to reduce energy consumption, they do not propose any tools for doing so. Given the impact of these installations and the lack of a specific regulatory framework, Asian countries will soon be forced either to update previous standards for tunnel lighting or elaborate new ones. A better understanding of the weaknesses of European regulations combined with a willingness to embrace innovation could position Asia as a world leader in the regulation of more sustainable road tunnels. The objective of this research was to improve the sustainability of tunnel lighting installations through new regulations or amendments to existing ones, without impairing the mental well-being of users, who could potentially be affected by energy-saving measures. Accordingly, this paper presents and analyzes a broad proposal for formulating tunnel lighting regulations. The originality of this proposal lies in the fact that it integrates road safety, lower environmental impact, and user well-being. Furthermore, it is expected to broaden the perspective of regulatory bodies and public administrations with regard to tunnel installations, which would ultimately enhance their sustainability.

scholarly journals Corrosion Level of Rock Bolts Exposed to Aggressive Environments in Nordic Road Tunnels

2021 ◽  
Author(s):  
Cristobal Javier Manquehual ◽  
Pål Drevland Jakobsen ◽  
Amund Bruland
Keyword(s):  
Steel Corrosion ◽  
Cold Climate ◽  
High Concentration ◽  
Rock Support ◽  
Rock Bolts ◽  
Tunnel Excavation ◽  
Support Measure ◽  
Deicing Salts ◽  
Road Tunnels ◽  
Kinetics Of

AbstractFor road tunnels in most Nordic countries, temporary rock support installed during tunnel excavation usually becomes a part of the permanent rock support. Rock bolts are the most common rock support measure in road tunnels excavated in hard rock, and their conditions over the period of tunnel operation play a significant role in the safety of these tunnels. The rock bolt types and aggressive environmental conditions considered in this research are focused on those used and observed in Norwegian and Swedish road tunnels. Findings elsewhere in similar environments are included to highlight the different kinetics of degradation. Based on the collected data, the corrosion levels in these road tunnels are comparable to those in the most polluted industrial areas. Aggressive groundwater conditions for rock bolts include a groundwater pH below four (which can be caused by sulfuric acid formation due to the oxidation of the mineral pyrite in the rock), marine groundwater, and flowing groundwater with a high concentration of dissolved oxygen. Furthermore, chloride-bearing deicing salts commonly used on roads located in cold climate regions during winter can promote corrosion in rock bolts from the tunnel room. For these environments, this research proposes a lognormal probability function to quantify the expected steel corrosion level for 25, 50, and 100 years of exposure time. The corrosion protection given by cement grouting, hot-dip galvanizing and epoxy coating are also addressed to explore their contributions to the lifespan extension of rock bolts in acidic and chloride-rich environments.

Innovative TBM traffic tunnels

2021 ◽  
Author(s):  
Silvino Pompeu-Santos
Keyword(s):  
Environmental Impact ◽  
Tunnel Boring Machine ◽  
Soft Ground ◽  
Seismic Behaviour ◽  
Construction Time ◽  
Tunnel Boring ◽  
New Concepts ◽  
Road Tunnels

<p>TBM tunnels, ie. tunnels made with the TBM ("Tunnel Boring Machine") technique are currently the most common in the construction of traffic infrastructure, allowing a significant reduction in costs, environmental impact and construction time. However, TBM traffic tunnels still face important challenges.</p><p>In order to overcome these challenges, innovative concepts were recently developed by the author: the TISB ("Tunnel of Improved Seismic Behaviour") concept, which allows the reliable construction of TBM tunnels on soft ground in seismic areas, and the TMG ("Tunnel Multi Gallery") and the TMF ("Tunnel Multi Floor") concepts, for rail and road tunnels respectively, allow to obtain very economical tunnels, while significantly improving safety of users during operation.</p><p>In the paper the description and justification of these new concepts are presented, as well as their application to TBM railway and road tunnels.</p>

scholarly journals Main aspects of deformation and rock support in Norwegian road tunnels

2019 ◽  
Vol 86 ◽  
pp. 262-278 ◽  
Author(s):  
A.H. Høien ◽  
B. Nilsen ◽  
R. Olsson
Keyword(s):  
Rock Support ◽  
Road Tunnels
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