Groundwater: For Tunneling, It’s All about Control

Groundwater will go where it wants to go and will exert hydrostatic pressure at the most inconvenient locations. Effective groundwater control is, therefore, one of the key factors to a successful tunneling project.

A Change of Conditions: Risk Management in Tunneling from the TBM Manufacturer’s Perspective

Let’s face it: tunneling projects are inherently risky. The actual geology can harbor unforeseen conditions even with rigorous testing. In TBM-driven tunnels, the machine and the crew operating it are key components of the risk management strategy. So, how can we ensure that the operation is done effectively as often as possible?

Continuous Improvement — Conveyor Belt Systems Aid in TBM Productivity

The invention of the tunnel boring machine has had a profound impact on the tunneling industry around the world. When conveyor belts were introduced, however, the speed and efficiency of the machine greatly increased.

Contracts and Risk, Building Blocks for Success

While there may be no “one size fits all” solution, there are several themes that need to be addressed to arrive at a contract suitable for a particular project.

Tunnel Updates

CALIFORNIA Los Angeles Crenshaw/LAX Walsh/Shea Corridor Constructors This $1.278 billion project for the Los Angeles Metropolitan Transportation Authority (Metro), being built by a joint venture of Walsh and Shea, is an 8.5-mile light-rail line that will run between the Expo Line on Exposition Boulevard and...

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