Two dimensional upper and lower-bound numerical analysis of the basal stability of deep excavations in clay

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Abstract

The basal stability of deep excavations in clay is often analysed using the classical approaches of Terzaghi (1943) and Bjerrum & Eide (1956). Terzaghi’s approach seems to be appropriate to excavation with small depth to width ratios, h/B, whereas Bjerrum & Eide give better results for greater h/B ratios. Not many attempts have been made to unify the two situations. In the present paper, the problem is analysed using upper and lower-bound considering two two-dimensional cases: a basic case, where the rigid stratum was considered deep, not affecting the stability of the excavation, and a case considering a rigid stratum at a certain depth. The embedded length of the wall was assumed null. A proposal for the stability numbers at failure is presented, for a wide range of h/B ratios.

Original languageEnglish
Title of host publicationNumerical methods in geotechnical engineering IX
EditorsAntónio S. Cardoso, José L. Borges, Pedro A. Costa, António T. Gomes, José C. Marques, Castorina S. Vieira
PublisherCRC Press/Balkema
Pages1197-1202
Number of pages6
Volume2
ISBN (Print)9781138544468
Publication statusPublished - 2018
Event9th European Conference on Numerical Methods in Geotechnical Engineering, NUMGE 2018 - Porto, Portugal
Duration: 25 Jun 201827 Jun 2018

Conference

Conference9th European Conference on Numerical Methods in Geotechnical Engineering, NUMGE 2018
CountryPortugal
CityPorto
Period25/06/1827/06/18

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Santana, T., Silva, M. V. D., Antão, A. N., & Guerra, N. C. (2018). Two dimensional upper and lower-bound numerical analysis of the basal stability of deep excavations in clay. In A. S. Cardoso, J. L. Borges, P. A. Costa, A. T. Gomes, J. C. Marques, & C. S. Vieira (Eds.), Numerical methods in geotechnical engineering IX (Vol. 2, pp. 1197-1202). CRC Press/Balkema.