The effects of deep excavations in soils and rock on adjacent structures

K.Y. Lo

In the proceedings of: GEO2011: 64th Canadian Geotechnical Conference, 14th Pan-American Conference on Soil Mechanics and Geotechnical Engineering, 5th Pan-American Conference on Teaching and Learning of Geotechnical Engineering

Session: RH Hardy Address

ABSTRACT: Urban developments require construction close to adjacent structures or directly above underground infrastructure. The excavation for the new structure induces stresses and displacements onto the existing structures and the effects have to be evaluated. The methodology to address this problem is illustrated by two well-documented case histories. The first case describes the deflections and stresses imposed onto the lining of subway tunnels in soil in Toronto. The second case deals with excavation in weak rock for the Bow Tower in Calgary and the effects on surrounding structures. Lessons learned regarding the evaluation of controlling soil and rock parameters, interpretation of monitoring results for ongoing construction, and impact on design approach are presented.

RÉSUMÉ: Les développements urbains requièrent qu™une construction se trouve à proximité des structures adjacentes ou juste a au-dessus des infrastructures souterraine. L'excavation de cette nouvelle structure provoque des déplacements et des contraintes sure les structures avoisinantes, et les effets doivent être évalués. La méthodologie permettant d™aborder ce problématique est illustrée par deux études de cas bien documentés. Le premier cas décrit les déformations et les contraintes imposées sur la doublure de tunnels de métro dans le sol, à Toronto. La deuxième cas traite d™une excavation localisée dans un roc friable pour la construction de la Tour de Bow, à Calgary ainsi que de ses effets sur les structures avoisinantes. Seront présentes leçons apprises au sujet de l'évaluation du contrôle des paramètres de sol et de roche, de l'interprétation des résultats de la surveillance de constructions en cours, ainsi que de l'impact portant sur la démarche du design.

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Cite this article:
K.Y. Lo (2011) The effects of deep excavations in soils and rock on adjacent structures in GEO2011. Ottawa, Ontario: Canadian Geotechnical Society.

@article{GEO11Paper1201,author = K.Y. Lo ,title = The effects of deep excavations in soils and rock on adjacent structures,year = 2011}