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Numerous hydroelectric plants include headrace tunnels that are getting old and operate beyond their originally-envisaged design life. Canada-based Dean Brox of Dean Brox Consulting discusses the importance of inspections and [...]

TBMs are increasingly being used for the construction of long and deep hydropower tunnels given their well-recognised higher rates of production advance that allow for early completion and the economic [...]

KERY DID HER JOB, once again. A Robbins main beam hard rock TBM bored the Albany Park Stormwater diversion tunnel and broke through at the end of August 2017. Kery [...]

The November BTS talk describes the square works for Finsbury Park and was presented by three speakers; Farid Acha, lead tunnel engineer for London Underground] John Elliot, director of underground [...]

The November 2015 meeting of the British Tunnelling Society was treated to a presentation on Abu Dhabi's super sewer, the Strategic Tunnel Enhancement Project (STEP). The speakers were Shahzad H [...]

THE BRITISH TUNNELLING SOCIETY chair Mark Leggett welcomed a packed audience, in the Telford Theatre at the Institution of Civil Engineers, to the Evening Meeting and introduced the speaker, Robin [...]

THE ANCIENT 'Silk Road' is perhaps the most famous trading route of all time running from China, through India, Pakistan and Iran into Europe. Over time this route grew to [...]

During normal operation, the piston effect of the moving trains lead to an air movement inside the tunnel and controls the air quality, temperature and humidity levels. Thus, the fans [...]

This paper, adapted from that presented at the Underground Construction conference in London, UK, in April by Andrea Krpo, describes ventilation concepts, including fire control, for a proposed rail base-tunnel [...]

Mexico's largest infrastructure project is a 62km long emergency wastewater pipeline being built to prevent flooding in the downtown area of the capital. Ground settlement in Mexico City has caused [...]

In order to renew the existing aged extra high voltage (EHV) transmission cable network as well as expand and enhance the power supplies to the central and southern parts of [...]

The baggage tunnel forms a vital link in Heathrow Airport's underground integrated transfer baggage system--a 2.1 km tunnel running between Terminals Five, Three and One. The scale of the transfer [...]

Ontario Power Generation's Niagara tunnel project includes the planning, design and construction of a 10.2km long, 12.7m internal diameter tunnel and associated facilities to divert an additional 500[m.sup.3]/sec of water [...]

Built in the 2nd Century BC, Via Egnatia was the first highway built by the Romans outside Italy. It crossed the Balkan peninsula from the Adriatic sea in the west [...]

Constructing the 2.4km long, 3m i.d. Dartford Cable Tunnel under the River Thames has proved a testing experience for UK contractor Amec. T&TI editor, Tris Thomas, recently visited the site [...]

Tunnels are a major feature of many pumped storage schemes, and their design and maintenance needs are key parts of research underway in Norway. The work is vital if the [...]

Niagara tunnel project, Canada Scheduled for completion next year, Ontario Power Generation's Niagara tunnel project includes the construction of a 10.2km long, 12.7m internal diameter tunnel and associated facilities which [...]

The TL2K tunnels are a relatively small part of Contract 103, being built as part of Section 2 of the Channel Tunnel Rail Link. But the size belies the complexity [...]

Terminal 5 is one of the largest construction developments in Europe today; with a monthly spend of about US$150.2M and a total estimated outturn cost of US$7.9bn. In 2008, Terminal [...]

GREAT BRITAIN -- The two TBMs mining the Northern Line Extension project in London have broken through. Launched in February 2017, the two 6m-diameter EPBMs bored twin 3.2km tunnels running [...]

The first Crossrail TBM has finished tunnelling in London. Crossrail announced yesterday that TBM Phyllis had reached Farringdon, the central station, ending its drive from Royal Oak, the western portal. [...]

It is no secret that the ground conditions in the Gulf are among the most aggressive in the world. Salinity of the ground water is around four times that of [...]

When the term hand mining is used, we know that we are talking about some type of tunnelling. For those who have never been in a tunnel, digging a tunnel [...]

Spain A gang posing as builders were stopped at the last minute from carrying out their latest heist. Having located an empty property close to a bank in the city [...]

USA: The alignment for the Clearwater Program in Los Angeles, USA has been chosen. The tunnel only solution was selected in spring following the environmental impact report. A spokesman for [...]

An experimental tunnel was being dug by the new bentonite tunnelling shield at New Cross in London. The tunnelling was through bad ground, sand and gravels. Particle sizes varied from [...]

JJ Kraner was hired by bridge and tunnel experts Viacon to lift a 44.5m-long, 37t prefabricated tunnel into place on the outskirts of Copenhagen. A new road was being built [...]

The Thames Tunnel Commission (TTC)'s report on alternatives to the Thames Tideway Project's Thames Tunnel only continued the impasse with Thames Water. TTC chair Lord Selborne said, 'Our forensic analysis [...]

THE FIRST-EVER TBM DEPLOYED in Laos has achieved breakthrough at the Theun Hinboun Expansion project. In late November 2010, Italian contractor CMC di Ravenna celebrated the breakthrough of a 7.6m [...]

It really is amazing to think that what eventually looks like a long hole in the ground, usually with a fancy lining (not that you can see it), is made [...]

With an increasingly busy tunnel workload, the City of Detroit Water and Sewerage Dept (DWSD) is calling for contractors to bid to construct the 5.75km long south tunnel Upper Rouge [...]

It was there and then it was gone--now it's back, it seems. Thanks to developer Berkeley Homes and the local council an alternative construction and finance plan has been worked [...]

The first section of the A86 West tunnel in Paris, popularly called the missing link in the capital's ringroad, is to debut Europe's first large active protection system against tunnel [...]

Following our news special feature in June, (T&TI, June, p15), T&TI has been told that one of the four Lovat TBMs being used by J Murphy & Sons on the [...]

On 25 October, the Jay Dee--Michels--Traylor JV cracked the Big Walnut Augmentation Rickenbacker Interceptor (BWARI) scheme in Columbus, US, when it broke through its Lovat mixed face EPB machine after [...]

In late October the much delayed Hindhead tunnel A3 trunk road improvements finally got the go ahead from the UK government. Stephen Ladyman, Transport Minister, announced on 27 October that [...]

Hot on the heels of Herrenknecht's historic first breakthrough on the transalpine Gotthard running tunnels, (T&TI, October, p6), comes the news that a second Herrenknecht TBM has holed through to [...]

There's been a couple of bits of much needed good news for the UK market this month. Firstly we see that the UK government has finally given the Hindhead Tunnel [...]

In late February, Lovat announced that the SMBS-ACE JV had broken through to the reception shaft with its 9.8m diameter EPB Lovat machine on Lisbon's Red Line in Portugal. Working [...]

East London's US$420M, 2.5km long Docklands Light Railway extension achieved its first major milestone on the 28 February, when the Lovat EPBM charged with boring the project's twin 1.8km long, [...]

In mid March a Herrenknecht TBM holed through, marking the completion of boring for the first 1.51 km long mixed mode running tunnel of the Silberwald, or Silver Forest, combined [...]

Following the news late last year that the SNC-Lavalin/Serco consortium had been selected to build the 19.5km long Richmond Airport Vancouver Rapid Transit Project (RAVP) in Canada, documents filed by [...]

Shanghai Tunnel Engineering Company (STEC) has holed through on the first of two 2.6km long tunnel drives for a new road tunnel under the Huangpu River in Shanghai. The 11.36m [...]

French contractor Vinci has secured a public-private partnership, worth US$629M excluding financing and operation, from the Romanian Ministry of Transportation, Construction and Tourism for a 36.1 km long motorway that [...]

Dragages et Travaux Publics has completed tunnelling work several weeks early on the second of four drives on its HK$2.8bn (US$359M) rail tunnel contract on the Sheung Shui-Lok Ma Chau [...]

Capitol Hill in Washington DC, USA, has been the subject of a study, delivered to Congress by the District's Department of Transportation, on how access to the area could be [...]

Tunnelling should start this month on the 2.5km long, 18[m.sup.2] Frosunda cable tunnel in Stockholm, Sweden. Lemminkainen Construction Ltd was awarded the contract in June, which also includes a 300m [...]

Caption: A contracting consortium of Spie and GTM has begun work on a tunnel to extend the Metro underground railway in Toulouse, France. To lower the 7.8m diameter tunnel boring [...]