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While fly ash is often used as a partial substitute for cement in civil construction, its usage in two-component grouts for TBM annulus grouting is varied. Opinions on the benefits of fly ash vary...Read more
USA - The Metropolitan Transportation Authority (MTA) Board approved the final major contract for the East Side Access project, which will build and finish four platforms and eight tracks for the new Long Island Rail Road (LIRR) terminal some 100ft below Grand Central Terminal, it announced on January 27.
Metro names Crenshaw/LAX TBM
CALIFORNIA - The Los Angeles County Metropolitan Transportation Authority (Metro) held a TBM lowering ceremony on February 1 for the Crenshaw/LAX Line.
LTA awards three TEL station contracts
SINGAPORE – The Land Transport Authority (LTA) has awarded three station contracts for the Thomson-East Coast Line (TEL). The contracts, worth a total of about USD 663.5M cover works for the Tanjong Rhu, Katong Park and Marine Terrace stations.
Mott MacDonald to design Thames Tideway East
GREAT BRITAIN – Mott MacDonald will design the eastern section of the Thames Tideway sewer tunnel in London. The section will be constructed by a joint venture of Costain, Vinci Construction Grands Projets and Bachy Soletanche.
Boris opens Lee Tunnel
GREAT BRITAIN – The Mayor of London officially opened the Lee Tunnel in January. The tunnel, the first of two new high-capacity sewers in to serve Britain’s capital is the largest project in the history of Britain’s privatised water industry.
While fly ash is often used as a partial substitute for cement in civil construction, its usage in two-component grouts for TBM annulus grouting is varied. Opinions on the benefits of fly ash vary from person to person and project to project, as do the economics. While most tunnelling projects use fly ash in two-component grouts a significant number of projects do not. The purpose of this paper is to quantify the performance of fly ash in two-component grouts by testing the compressive strength, bleed, gel time, and viscosity and also comparing these same parameters with fly ash from different geographic sources
Switzerland's Lötschberg, was the first Alpine rail base tunnel to open and focuses now on operations and possible expansion reports Adrian Greeman
The Koralm connection
Austria’s Koralm tunnel is part of a new alpine link in Europe. Keren Fallwell reports
Under the river
Tunnelling under the Fraser River in the Lower Mainland, British Columbia, is no easy task. That is what the Port Mann Main Water Supply Tunnel project team has learned over the past three years. Stephanie Fekete and Andrew McGlenn of McMillen Jacobs Associates discuss the recent tunnel completion and summarise the demands that were required in order to make this drive successful
With the World Tunnel Congress meeting at San Francisco for 2016, Nicole Robinson, Editor of Tunnels & Tunnelling North America, provides an overview of the region’s tunnelling work
THE TAIL end of 2015 saw an historic agreement to combat global carbon emissions. The hope is to keep global warming below a 2oC threshold (actually aiming for 1.5 oC) and in so doing save the planet. The 2015 United Nations Climate Change Conference Agreement, better known as the Paris Agreement, or COP 21, has been celebrated by pundits and politicians worldwide, despite some of the legally binding phrasing being edited out.
Woodhead Pass Tunnel
The UK is contemplating the pros and cons of constructing the world’s longest road tunnel. Not yet named, it would be an improvement of the A628 connection between Sheffield and Manchester, located in the Peak District, a hilly National Park in the North of England.
IT'S A HOT Sunday evening in late June. I've got an assignment overdue for work; lectures starting early the following morning, and instead of thinking about either I'm heading to the Warwick University Campus Bar. It's good to be back in further education.
In a trip to China, the UK’s chancellor George Osborne has been trying to spark interest in High Speed Two (HS2) investment opportunities. Some GBP 24bn (USD 36.5bn) was laid out for the consideration of potential spenders at an event in Chengdu, the capital of Southwest China’s Sichuan province. Osborne tweeted from the event: “Today we open bidding process for HS2 construction with contracts worth 11.8bn. A milestone in a project key to Britain's future.”
Protecting his state from potential cost overruns, newly-elected New Jersey governor Chris Christie proudly brought the Access to the Region's Core (ARC) tunnel project to a halt in 2010. The USD 8.7bn rail project under the Hudson River would have connected New Jersey to New York through two, single-track 2.26km-long tunnels.