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Design of Shallow Caverns in an Urban Environment

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Author H Lagger, A Amon and S Pollak
ID P200803033

Description

This paper describes the current and finished design work which has been
performed for shallow rock station caverns for New York City’s first new subway
construction in 60 years. A new robust, sophisticated, design procedure has been
developed for two up to 30 m wide caverns, with overburden of less then 12 m,
and rock cover to span ratios (C/S) in the order of 0.25. The design is based on
empirical input parameters like the Q-value, rock mass rating (RMR) values, rock
mass class after Cording (1984), cover to span ratios, which have been validated
by the use of structural computer models as well as two- and three-dimensional
numerical discontinuum models. The design approach is a staged approach using
first principles, empirical models and non-linear FEM and DEM models.


In addition, the paper describes the factors and circumstances why shallow
caverns have been selected instead of cut-and-cover structures and why all the
underground station structures have been developed as drained
structures.