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International relations
21 October, 2019
On behalf of TAC, Andre Rancourt travelled to China to attend a workshop hosted by the China Railway Society.

In demand in Montreal
21 October, 2019
A local building boom has affected the supply of shotcrete to contractors across the tunnelling and wider construction industry. Liam Ireland, technical sales engineer, King Packaged Materials Company, reports

Navigating live tunnel connections
30 September, 2019
Connecting the Des Plaines Tunnel System to the McCook Reservoir is one of the latest – and more challenging – components of TARP. Report by Cary Hirner and Faruk Oksuz of Black & Veatch, and Carmen Scalise of the Metropolitan Water Reclamation District of Greater Chicago

Properties of Fibres
30 September, 2019
Benoit De Rivaz, a fibre expert working with Bekaert Maccaferri, a supplier of steel and polymer fibre discusses the various material characteristics of steel and polymer fibres, with special regards to long-term performance

Tunnelling costs and production rates benchmarked
30 September, 2019
Bill Grose of Bill Grose Consulting and Aleister Hellier of the Infrastructure Projects Authority at Her Majesty’s Treasury in the UK present this paper on efforts to benchmark UK tunnelling costs and production rates in 2018

Code red
30 September, 2019
Following the World Tunnel Congress in Naples, Paola de Pascali looks at Italy’s political and economic crisis, which is shared by the construction sector, itself struggling to stay afloat as large amounts of money are being lost

Life with the Seri Nala
30 September, 2019
With excavation complete, engineers from the Afcons side of the Strabag- Afcons joint venture recall the most challenging moments from the southern drive of the Rohtang Tunnel. Alex Conacher reports

Little by little
30 September, 2019
Paola De Pascali spoke with Gísli Eiríksson, the chair of the Icelandic Road and Coastal Administration (IRCA) and Einar Hrafn Hjálmarsson, ÍAV managing director for earthworks, to explore the challenges of the tunnelling industry in Iceland

The China experience
30 September, 2019
Chinese industrial leaders outlined their hopes for growth in construction equipment exports at Bauma this spring. The underground market is a key target for these suppliers, but the process of going abroad has not been without challenges, even with an enormous push from Beijing to finance foreign infrastructure, Alex Conacher reports

ICUEE 2019
27 September, 2019
Held every two years, the International Construction and Utility Equipment Exposition is the utility industry’s largest show with more than 850 exhibitors

Momentum
27 September, 2019
The City of Los Angeles has seen several milestones this summer for its Purple Line extension, Nicole Robinson reports on the progress for each phase

TAC 2019
27 September, 2019
This year’s workshop focuses on the use of tunnelling technologies and underground space for stormwater and flood control

Slurry TBMs
27 September, 2019
Slurry TBMS are considered “SOFT ground” tunnel boring machines (along with earth pressure balance TBMs), which use pressurised slurry in the excavation chamber to balance the groundwater and soil pressure.

Stay connected
27 September, 2019
Guido Perez Manfredini, regional commercial manager, MST Global, discusses unified communication and data networking for tunnels

Northern exposure
27 September, 2019
A round-up of tunnel work in the Nordic Forum

Chelsea to Battersea tunnel surface settlements
16 August, 2019
Monitoring of ground surface movements induced by the construction of the Chelsea to Battersea Pipeline Tunnel project is presented as part of this case study. The surface settlements induced by the shaft construction have been analysed and compared with current methodologies and information from recent projects. Movements from excavation and construction of the tunnel are also analysed, and back-analysis of volume losses is presented. The authors are Veriuska Ortiz Lovera, geotechnical engineer, Mott MacDonald; Andrew Hejdner, project manager, Cadent Gas; James McCaffrey, construction manager, Skanska UK Construction; and Mohammad Arasteh, senior tunnel engineer, Mott MacDonald

Enrique Fernández González
16 August, 2019
Alejandro Sanz of gGravity Engineering remembers Enrique Fernández González (1960-2019)

Get the muck out
14 August, 2019
Following reader requests, Amy Duncan of Dos Santos International has written this article on the development of the sandwich belt high angle conveyor concept, which has recently been employed on the Grand Paris Express project

Marr’s improved lifting plan for Sydney Metro
14 August, 2019
An existing lifting plan for the Sydney Metro project was scrapped in favour of one more appropriate for cramped site conditions. Paola De Pascali reports

Underground heat recovery
14 August, 2019
Matt Houchin, assistant engineer – tunnel ventilation and operations, WSP, presents this paper on the potential for heat recovery from tunnels