The drill and blast method is one of the most widely used techniques for constructing tunnels in hard rock, where controlled drilling of blast holes, careful charging with explosives, and sequential detonation allow for efficient rock fragmentation and safe excavation. This method requires precise design and execution to minimise vibration, protect surrounding structures, and ensure stability, making it both a challenging and fascinating aspect of tunnelling. If you would like to gain a deeper u

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

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81K views · 1.5K reactions | 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 | Facebook