Publicação
Two dimensional upper and lower-bound numerical analysis of the basal stability of deep excavations in clay
| Resumo: | 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. |
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| Autores principais: | Santana, T. |
| Outros Autores: | Silva, M. Vicente da; Antão, A. N.; Guerra, N. C. |
| Assunto: | Numerical Analysis Geotechnical Engineering and Engineering Geology |
| Ano: | 2018 |
| País: | Portugal |
| Tipo de documento: | documento de conferência |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade Nova de Lisboa |
| Idioma: | inglês |
| Origem: | Repositório Institucional da UNL |
| Resumo: | 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. |
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