Mark Trim Tunnels and Underground Engineering Practice Lead

Mark Trim is a principal engineer with over 28 years of experience providing technical leadership and strategic oversight on major underground infrastructure projects. He applies his expertise in geotechnical and structural engineering to design underground structures, specializing in permanent and temporary works, tunnel design, deep excavation support systems, soil-structure interaction, and ground improvement.

Mark has designed tunnels in hard and soft ground using the sequential excavation method (SEM)/New Austrian tunneling method (NATM), tunnel boring machines (TBMs), shielded roadheaders, and cut-and-cover techniques. He also has in-depth knowledge of fiber-reinforced concrete/​shotcrete materials, performance, and testing methods.

Mark holds an MS in Mining and Earth Systems Engineering and a BS in Civil Engineering from Colorado School of Mines. He is a Chartered Professional Engineer in Australia and a registered Professional Engineer in Queensland and Victoria, as well as in California, New York, and Texas.