Bergen Tunnels Rehabilitation – A Success After All

Synopsis: 2001, the New Jersey Transit Authority commissioned the JV Merco-Obayashi with the rehabilitation contract of the approximately 130-year-old, 4,200 … Read more »

Considerations for Very Shallow Conventional (SEM) Tunneling in Urban Settings

Synopsis: Construction of shallow mined tunnels is frequently undertaken by use of conventional tunneling known as the Sequential Excavation Method … Read more »

Monitoring Successful NATM in Singapore

Synopsis: The Fort Canning Tunnel, Singapore, is an approximately 50 feet (15m) wide vehicular tunnel under shallow ground cover that … Read more »

NATM Through Clean Sands – The Michigan Street Experience

Synopsis: A 100 ft long, 20 ft high and 18 ft wide NATM tunnel was excavated through grouted clean sands … Read more »

The Dulles Corridor Metrorail Project – Extension to Dulles International Airport and Its Tunneling Aspects

Synopsis: The Virginia Department of Rail and Public Transportation and the Metropolitan Washington Airports Authority are undertaking the extension of … Read more »