Excavation of the 34th Street Station

The presentation will describe the GI and detailed design work that has been undertaken for the design of the initial rock support at the 34th St. Station Cavern for the No.7 Line extension and the Grand Central Station Caverns for the East Side Access Project, both are currently under construction in New York.

The presentation will address the importance of undertaking a detailed GI and how the results of the GI can be interpreted in order to establish meaningful ground models and rock properties for the design work.

The performance of the initial ground supports will then be discussed and the experience gained from the design and excavation of these large span and shallow rock caverns will be presented. In particular the back analysis of joint properties such as persistence and spacing will be highlighted, both of which have lead to the development of a refined ground model and a better appreciation of the rock mass behaviour in the Manhattan Schist, Granites and Gneissic rocks.

The presentation will illustrate the value of engineering geologists both during the initial GI work and then during construction when detailed geological mapping can be used to verify design assumptions.

Refreshments will be provided. The event is scheduled to start at 5pm.

Please contact the convenor for further information and to register interest in the event. For more information, please download the flyer below.