Gall Zeidler Consultants

This year marks 25 years of engineering excellence at Gall Zeidler Consultants (GZ)—a global leader in tunnel design, engineering, geotechnics, tunnel rehabilitation, and program and construction management. With over 300 miles of tunneling projects completed worldwide, our international team specialize in mastering difficult ground conditions by utilizing various methods, including dewatering, grouting and ground freezing. We also specialize in tunneling under shallow overburden and protection of neighboring structures by innovatively combining conventional (NATM/SCL/SEM) and mechanical (TBM) tunneling methods with ground improvement and state of the art waterproofing techniques. Our service portfolio ranges from conceptual and initial inception-level tasks—such as preparation of feasibility studies through development of tunnel designs and contractual documents—to construction management and site support services. With a diverse portfolio of projects in the Rail & Transit, Transportation, Power, Water & Wastewater and Mining markets, we have built a reputation for helping clients overcome complex challenges and advancing world-class infrastructure. As a result of our extensive experience, our specialists are often selected to serve on expert review panels shaping the future of tunneling worldwide. At GZ, design does not stop at the drawing board—we remain engaged through construction support, ensuring the final product is successfully brought to life.