YieldPoint has developed a strategic partnership with Geocomp Inc of Acton, Mass. As part of this Geocomp conducted a year of rigorous testing on YieldPoint’s d-EXTO borehole extensometer. Subsequently Geocomp has used these extensometers for monitoring the Crenshaw Extension and The Regional Connector in Los Angeles.
Here is a link to Geocomp’s newletter on the project. Click here
According to wired magazine, Elon Musk, founder of SpaceX is also interested in tunneling in LA.
As outlined in the article tunneling in urban areas is challenging. because a) the ground is full of stuff; b) that stuff is poorly mapped; and c) construction freaks out the locals. “Our recent experience with tunnels in the US is that neighbors worry, you run up against various environmental laws, and you just never know what’s underneath the Earth,” says Michael Manville, who studies urban planning at the University of California, Los Angeles.