Tunneling through an urban environment like that of Los Angeles is complex enough. Add to that a medley of poor soils (including tar pits); a variety of dangerous gases; and two seismic faults and it becomes a task that until not so long ago was impossible.
Would a student who has never seen a tunnel under construction envision a tunneling career? The Moles, a heavy construction leadership group with its roots in tunneling, thinks the answer is “not likely.”
Cross passages between both bores of London's 0.7-mile Silvertown tunnel are nearing completion, marking the end of excavations on the River Thames crossing.
Contractors are navigating existing infrastructure and coordinating among stakeholders as they construct a 700-ft extension to the Hartsfield-Jackson Atlanta International Airport's Plane Train tunnel.
Northern Virginia city's longstanding issues are set for remediation through RiverRenew—a $665-million program that features use of a 380-ton tunnel boring machine to create a new overflow storage tunnel.