An ill-starred effort to bore one of the deepest tunnels in the world has restarted in the mountains of northern Peru after months of delays due to rock bursts. The $247-million Los Olmos irrigation project was halted when the tunnel-boring machine at work on the 12.5-mile-long tunnel (with 6,890 ft of overburden) was damaged by rock bursts in April. On July 8, engineers with Brazilian construction firm Odebrecht were able to restart the TBM, but rock bursts continue to hinder progress. In August, work began on the tunnel’s opposite approach using conventional drill-and-blast methods. The tunnel breakthrough is now slated
The market is generally healthy and steadily growing, and margins are up for large specialty contractors. Further, advances in design tools and owner demand for collaboration are giving subcontractors a seat at the table early on in projects.