List of products by author: D. Willis

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  Raising EPB Performance in Metro-Sized Machines

  Abstract: Singapore is employing more than 29 earth pressure balance machines (EPBMs) to excavate a single 21 km metro line, Downtown Line 3. Moscow is adding 50 km of new metro line by 2016, 150 km by 2020. China will expand their metro lines tenfold by 2050 to more than 11,700 km. China’s plans for the next two years require 250 EPBMs. With such extensive global metro expansion plans, increasing EPBM...

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  TBM Design for Long Distance Tunnels: How to keep Hard Rock TBMs boring for 15 km or more

  Abstract: Today’s Tunnel Boring Machines are often required to bore longer tunnels in harder rock at a faster pace—a trio of challenges that can be daunting for any contractor. With proper design, operation, and maintenance, however, modern TBMs are very capable of reaching their 10,000-hour design life or more. TBMs in the industry today have already accomplished the feats of boring upwards of 50 km on...

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