The Hallandsås Tunnel Project (Sweden)

The Hallandsås Tunnel Project was a major railway infrastructural project in Sweden associated to a long history. It was opened to the public end of 2015. In 2004, the third attempt to complete the construction of the two tunnels started, based on an alternative technical solution involving excavation with a 10.6m diameter dual mode hard rock Mix-Shield TBM, which was a complex machine capable of being operated in open mode, closed mode (slurry) up to 13 bars and to undertake systematic pre-excavation grouting. The large variations in the characteristics of the rock mass, the high water pressure (up to 13 bars) and the presence of long water bearing zones made the ground conditions definitively difficult. The most significant difficulty along the tunnel route was the Mölleback zone, an extensive fault zone, about 320m in length. A part of this fault was subject to an advanced ground freezing operation of 125m in length in order to permit TBM excavation, the remaining part being treated by conventional cement grouting.

Our presenter:

Francois Dudouit has over 33 years of construction experience, gained on major railway underground projects in France, Denmark, Hong Kong, Nederland and Sweden. His experience includes TBM excavation in challenging soft ground and hard rock, with pressure up to 13 bars. Between 2003 and 2012, he was responsible for the construction on the Hallandsås Tunnel Project. He is presently Project Director of Link Alliance for City Rail Link Contract C3.


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Worksafe Tunnelling Update on High Hazards Unit Activities and CPD

The New Zealand Tunnelling Society would like to invite you to the above presentation being delivered in Auckland on Thursday, 20 June 2019.

Worksafe is responsible for assessing competency of personnel engaged in the extractive industries through the New Zealand Mining Board of Examiners. The High Hazards Unit of Worksafe is responsible for inspections of mining, tunnelling and quarrying operations across New Zealand. Paul Hunt is Chief Inspector Extractives of the HHU and he will outline HHU’s current activities which include an extractives intelligence and information project which aims to provide reliable statistics on the safety performance of the extractive industries and to allow targeting of inspections for the coming year. He will discuss the inspection focus for 2019 – 2020 as it relates to the tunnelling industry and the WorkSafe approach to regulating the upcoming Central Interceptor and City Rail Link tunnel projects.

He will also discuss the recent CPD review and the implications for Certificates of Competence. SSEs and other professionals within the tunnelling industry will be directly affected by these changes.

Paul Hunt has a 30 year history in the mining sector and holds First Class Coal Mine Manager and Site Senior Executive qualifications along with qualifications in incident management, incident analysis, minerals industry risk management and occupational health management. He currently chairs the New Zealand Mining Board of Examiners.

Thursday 20 June 2019, 5.30 – 7pm
The Bluestone Room, 9 – 11 Durham Lane, Auckland CBD, 1010

This is a free event, all are welcome but space in the room is limited so please RSVP by Wednesday, 19 June using the link below:

We hope to see you there!

Kind regards,

Andrew Campbell

Rail Tunnel Refurbishment Following the November 2016 Kaikoura Earthquake

Our presenter:

Rafael Sierra Ballen has worked as a construction manager for over thirty years in South America, the Middle East, Asia, Australia and New Zealand for major civil engineering projects as a tunnel design manager and a tunnel construction manager.

Topics Covered During this Presentation

From a standing start, following the largest ever recorded earthquake in New Zealand, a highly committed collaborative team, assessed the damage across twenty tunnels, designed the repairs in view of future resilience, and built a construction capability that delivered the works safely and on budget. Works trains were running again within 7 months, and commercial services within 10 months. In doing so, we reconnected communities at the top of New Zealand’s South Island.

Rafa will describe the logistical and technical challenges of refurbishing the rail tunnels in the context of the natural terrain hazards and landslides informed by his experiences of driving the quality and safety outcomes achieved.

Refreshment kindly sponsored by:





Refreshments (snacks and soft drinks) will be available from 17:30, and we will be continuing the discussion after the main event at the Lumsden Bar in Newmarket