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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 [...]

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 [...]

Ireland's Limerick Main Drainage scheme is a US$239M project that involves constructing some 48km of sewers of up to 2.82m diameter for Limerick City Council. The construction stage comprised 19 [...]

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 [...]

Today's tunnel fire suppression systems generally have three main objectives: to provide protection and safety for users; to support rescue personnel; and to protect the tunnel structure. Whatever system is [...]

Tunnels pose particular challenges in the design of fire safety measures, for which numerical models have an increasing role to play. Stewart Miles, senior consultant for FRS, the Fire Division [...]

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 [...]

On 21 October 2004, an audience of BTS members and guests heard a presentation on the construction of the Uetliberg Tunnel, part of Zurich's west bypass. The speaker was Stefan [...]

In order to gain consent to tunnel under London's railways and provide safety assurances to the surface railway authorities, CTRL's C250 team developed a comprehensive automatic monitoring system, which allowed [...]

The US$7.3bn Terminal 5 (T5) scheme at London Heathrow Airport, in the UK, is among the largest infrastructure projects currently being undertaken in Europe. The site of the new terminal [...]

Tunneling on the CSO control tunnel project in Providence by Shank/Balfour Beatty for the Narragansett Bay Commission is underway. The TBM components were lowered into the 290ft (88m) deep access-working [...]

The 16.9km long Gotthard Road Tunnel in Switzerland, is the key element of one of the most important road connections through the Alps. The single-bore tunnel with bi-directional traffic on [...]

Every time a tunnel at shallow depth has to be built in the presence of ground water, the problem of dewatering needs to be addressed. A typical solution is to [...]

The US$530M Cross City Tunnel is one of the most complex and challenging infrastructure projects undertaken in Sydney; Australia, with underground railway lines, building basements and services to be negotiated. [...]

The longest road tunnel in the world, the 24.5km Laerdal tunnel in Norway, provided unique design developments for ventilation and driver safety. Tunnelling under high rock stresses offered significant challenges [...]

El Azhar road tunnel Cairo's new frontier: the 2.4km long, twin bore El Azhar road tunnel was designed and built in just 40 months to Europe's highest fire-safety standard. The [...]

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 [...]

The second tunnel contract awarded recently by SDCWA is the 1.12 mile long Olivenhain-Lake Hodges connection. In April 2005 a $34.5 million design-build contract was awarded to Kiewit Pacific. Two [...]

Construction of NEIS is progressing on schedule despite several major obstacles overcome by the Traylor Bros-led JV. As of late August, 85% of the tunnel was excavated with two Reaches [...]

By mid-April 2004, excavation of the 16,194ft (3 mile) long 20ft diameter CS0 rock tunnel for the was complete--two-and-a-half months earlier than scheduled. Finishing works had staged and were progressing [...]

Two slurry TBMs--believed to be the first ever used in the USA--have set off on their respective drives through the soft saturated deposits of the Willamette River in Portland, Oregon. [...]

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 [...]

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 [...]

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 [...]