A History of Tunneling in Los Angeles

摘要

Tunneling is booming in Los Angeles. The surge in recent tunneling projects, coupled with thernarrival of the North American Tunneling Conference in downtown Los Angeles presents an ideal opportunity tornlook back on the local history of tunneling. Our timeline begins in the early 1900s with the hand mined roadwayrntunnels on 2nd and 3rd Streets and extends forward to the earth-pressure balance TBM tunnels constructed byrnLA Metro in the last decade. We reexamine local tunneling obstacles (settlement, gassy ground) and previewrnthe next great tunneling projects to come.