Multi-Modal Tunneling in Mexico

Mexico’s Túnel Emisor Poniente (TEP) II is a study in transitions—much of the tunnel travels through andesite with bands of tuff, below mountain ranges and through fault zones.

Reflections on Differing Site Conditions, or Why I Believe That Mother Nature Is a Bitch

Anyone who has been involved with the design and/or construction of tunnels for more than a few years becomes well aware of the so-called Differing Site Conditions (DSC) clause.

Planning for Growth in Vancouver

Metro Vancouver is in the process of updating its infrastructure to accommodate future population growth in the region, including a new outfall tunnel.

Q&A with Bob Goodfellow

TBM was recently asked Bob Goodfellow about the development of the risk management guidelines, as well as the state of the practice in the United States.

Tunneling in Northern Europe

In nearly every European country some tunneling projects are underway, notably the Trans-European Network for Transport (TEN-T), which is helping to realize a more reliable and coherent network for transport.

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