Check out what it takes to mine a new light rail tunnel under downtown Bellevue without the aid of a giant tunnel boring machine. Our blog post on the Sequential Excavation Method of tunnel mining explains all: http://ow.ly/yXvt309um2T The tunnel is part of the East Link light rail project bringing you a 20-minute trip between Bellevue and downtown Seattle, regardless of traffic. | Sound Transit

Tunnel talk alert ⚠️ To build the mined section of the North East Link Tunnels in Bulleen, large road headers chip away at the rock layer deep underground. To support the tunnels as they’re built, we’ve been excavating the tunnels in sections using four road headers. This is called a sequential excavation method (SEM) and is a common technique used to build tunnels. We’ve now completed the excavation! From here, crews will continue concrete lining works within the tunnels which is progressing we

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27 reactions | Watch this video to learn how to color tunnel portals, retaining walls and culverts for model train layouts. See our entire selection of these products on our website here: https://woodlandscenics.woodlandscenics.com/show/category/PortalsCulvertsRetWalls | Woodland Scenics | Facebook

The New Austrian Tunnelling Method (#NATM), which is Also known as the sequential excavation method (#SEM) Or Sprayed Concrete lining method (#SCL) developed between 1957- 65 in #Austria. It is referred to as a “design as you go” approach. | Megha Engineering and Infrastructures Ltd