Soft ground

London Bridge is a major new station on the 16km long Jubilee extension of London Underground. The vicinity of construction is considered highly sensitive due to old existing tunnels and surface structures. The original design called for hand mining, shield machines for excavation and a segmental cast iron lining for tunnel support. NATM handled the geometrically complicated tunnel alignments and shapes with significantly lower effort. It minimised settlements, which reduced the amount of compensation grouting estimated.

The North Shore Connector Project consisted of three underground station structures and running tunnels, excavated with TBM and Cut-and-Cover tunneling methods. It also included a twin bore tunnel under the Allegheny River. Dr. Sauer and Partners provided design review and design support services. The development of the waterproofing system for underground structures including tying into an existing station using a flexible membrane system, combined with a sectioning system that allows for section grouting instead of the entire structure if a leak is detected was also provided.

Design study on feasibility of construction of tunnels beneath active airport taxiway using systematic dewatering wells and Door Frame Slab Method.

The Heathrow Express Link provides a 15 minute high speed rail service between Paddington Station and Heathrow Airport. A 7.25 km spur running for the most part in tunnel provides the airport with underground stations at the Central Terminal area (Terminals 1, 2 & 3) and Terminal 4. Provision was also made for a link to the at this point proposed Terminal 5. The 5.5 km long tunnelled section will pass under the M4 motorway with the portal located to the north.