Geodetic monitoring of underground excavations: 70 years after Terzaghi's innovative techniques at the Chicago Subway Tunnels

V.A. Kontogianni, P.A. Psimoulis, S.I. Pytharouli, S.C. Stiros

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

3 Citations (Scopus)

Abstract

In the late 1930's Karl Terzaghi, during the construction of the Chicago Subway Tunnels in soft rocks, introduced a new technique: he adapted excavation parameters to geodetic observations of ground settlement. This innovative technique, subsequently called by Ralph Peck 'observational method', revolutionized tunnel excavation, till then confined to fully pre-determined models. Major progress in the observational method, however, occurred since the advent of electronic and automatic, real-time monitoring techniques, mostly based on geodetic instrumentation. A number of examples indicate the significance of this method, very popular in our days, in different types of underground works, with monitoring data used in feedback analyses, optimization of the geotechnical modeling and eventually, prediction of deformation.

Original languageEnglish
Title of host publicationGeotechnical Aspects of Underground Construction in Soft Ground
Subtitle of host publicationProceedings of the 5th International Symposium TC28. Amsterdam, the Netherlands, 15-17 June 2005
EditorsKlaas Jan Bakker, Adam Bezuijen, Wout Broere, E.A. Kwast
Place of PublicationLondon
Pages725-730
Number of pages6
Publication statusPublished - 22 Dec 2005
Event5th International Symposium of the International Society for Soil Mechanics and Geotechnical Engineering - Amsterdam, Netherlands
Duration: 15 Jun 200517 Jun 2005

Conference

Conference5th International Symposium of the International Society for Soil Mechanics and Geotechnical Engineering
CountryNetherlands
CityAmsterdam
Period15/06/0517/06/05

Keywords

  • excavation parameters
  • Karl Terzaghi
  • geodetic observation
  • ground settlement
  • tunnel excavation

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