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  Content Type Features
  Date 2020
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Fibres of steel
24 November, 2020
Choosing the right steel fibre for FRC precast tunnel segments can have a significant impact on performance, productivity and cost, explains Benoit de Rivaz, Global Technical Manager BP Underground, Bekaert

Melbourne’s big dig
24 November, 2020
Four TBMs are at work on the Melbourne Metro – a new line comprising two 9km-long tunnels that will run beneath the central business district and where monitoring for ground movement was critical. Julian Champkin reports on the progress

Canadian distance record
20 November, 2020
Microtunnelling can save costs, surface disruption and inconvenience to the public, while the distances that can be covered are increasing. Julian Champkin looks at a 5km project in Canada and asks whether the technique can stretch even further

Rock Mass Classification Systems
20 November, 2020
Rock mass’ refers to an accumulation of rock material separated by rock discontinuities, mostly by joints, bedding planes, dyke intrusions and faults. When a rock mass is intersected by a sufficiently large number of weak planes such that rock-mass behaviour is not controlled by failure on individual planes, the mass’s behaviour will tend towards the continuum type of behaviour again. However, the numerous planes in the mass (usually weaker than the rock material), will significantly influence rock behaviour. In such cases, rock mass classification is commonly used to evaluate the rock mass behaviour.

Structural design and classification of FRC for tunnel linings
20 November, 2020
Axel G Nitschke, Tunnel Practice Leader at WSP USA, looks at the use of fibre-reinforced concrete and suggests a labelling and classification system designed to provide an effective and easy way to specify FRC for tunnel linings

BTS celebrates 50 years
19 November, 2020
In February 2021, the British Tunnelling Society will be 50. To celebrate, it is compiling a major retrospective to chart half a century of momentous advances in tunnelling, recording the changes through the eyes of tunnellers. George Demetri takes a look

Not going viral
23 October, 2020
Many feared the outbreak of Covid-19 would wreak havoc on the tunnelling sector so how has it fared during the coronavirus pandemic? Perhaps not as disastrously as feared. Julian Champkin investigates

Two-Way Tunnelling in Seoul
23 October, 2020
Great Train Express (GTX) is a proposed high-speed commuter line with shared infrastructure that will connect new towns around the greater Seoul Metropolitan Area with the capital. It is the first project in Korea to use a large-bore TBM. Dr Warren Wangryul Jee, chairman and tunnel project manager of GTS-Korea, reports

Up the junction, round the bend
23 October, 2020
While pushing a preformed portal box through an excavation has been done before, a Network Rail project demands that it be done on a curve – and that hugely increases the complexity. Julian Champkin reports

Extending the Tamoios highway
23 October, 2020
Located mostly in Brazilian rainforest, the Tamoios highway and tunnel project is of critical importance to the Brazilian economy. It was the subject of the BTSYM talk in September given by project director Pedro Soares dos Anjos. Report by Divik Bandopadhyaya of London Bridge Associates

Automation, AI and the future of tunneling
23 October, 2020
Modern, mechanised tunnelling methods have had an enormous economic, environmental and cultural impact globally. To sustain long-term growth in tunnelling operations, industry and academia are researching new technologies to better handle challenging conditions. Among these, automation and artificial intelligence have an essential and promising role in the future of underground construction.

Groundwater control for tunnel cross passages
23 October, 2020
Dr Martin Preene of Preene Groundwater Consulting looks at the construction of cross passages and the various techniques for groundwater control and ground treatment

Silent Sentinels on watch in The Hague
22 September, 2020
Challenging municipal requirements were met using advanced instrumentation to provide accurate geomonitoring of road tunnels in the Netherlands

Innovation in wireless remote condition monitoring
22 September, 2020
Simon Brightwell and Markus Rennen of Senceive explain how wireless remote condition-monitoring can provide early warning of a wide variety of subterranean changes in tunnels and so help drive subsequent data-based decisions

Mexico’s Megatunnel
22 September, 2020
It is the world’s largest sewage project and has faced issues which mega projects of this nature usually face in terms of geology, delivery and budget. But T&T’s Julian Champkin finds that Mexico City’s Emisor Oriente is a triumph nevertheless

Connecting HS2 at Euston
22 September, 2020
Work on the UK’s new HS2 high-speed rail line is on track. Emma Hale and Christoph Eberle of Mott MacDonald describe one of the line’s first underground structures to be built in London

Improving Shotcrete’s Green Credentials
22 September, 2020
Sprayed concrete has been used for many years. Yet like all concrete, it has environmental drawbacks. Julian Champkin spoke with Dr Alun Thomas on ways to improve the carbon footprint of shotcrete tunnels

Tunnelling Under Live Loads
21 September, 2020
Tunnel and Underpass Projects beneath live railroads and highways are among the most sensitive and complicated underground projects in terms of design, construction, monitoring and, most importantly, safety. However, a good number of projects in this category have enough cover (preferably a minimum of a half to one tunnel diameter) to allow conventional tunnelling techniques to be implemented without any major risk to the travelling public.

Building tunnels in the 19th century
21 September, 2020
In June, Peter Harris, Director Tunnels and Civil Engineering COWI UK, gave to an online BTS audience a fascinating and scholarly presentation on how the Victorians built their tunnels. Ivor Thomas reports

Conexpo 2020
21 September, 2020
A visit to the Conexpo show in Las Vegas in March saw the US equipment industry in bullish mood, despite concerns about the coronavirus