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

T. Santana; M. Vicente da Silva; A. N. Antão; N. C. Guerra

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

T. Santana, M. Vicente da Silva, A. N. Antão, N. C. Guerra

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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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 language	English
Title of host publication	Numerical methods in geotechnical engineering IX
Editors	António S. Cardoso, José L. Borges, Pedro A. Costa, António T. Gomes, José C. Marques, Castorina S. Vieira
Publisher	CRC Press/Balkema
Pages	1197-1202
Number of pages	6
Volume	2
ISBN (Print)	9781138544468
Publication status	Published - 2018
Event	9th European Conference on Numerical Methods in Geotechnical Engineering, NUMGE 2018 - Porto, Portugal Duration: 25 Jun 2018 → 27 Jun 2018

Conference

Conference	9th European Conference on Numerical Methods in Geotechnical Engineering, NUMGE 2018
Country/Territory	Portugal
City	Porto
Period	25/06/18 → 27/06/18

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2018.NUMGE.santanaetal2018Final published version, 3.08 MB

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Santana, T. ; Silva, M. Vicente da ; Antão, A. N. et al. / Two dimensional upper and lower-bound numerical analysis of the basal stability of deep excavations in clay. Numerical methods in geotechnical engineering IX. editor / António S. Cardoso ; José L. Borges ; Pedro A. Costa ; António T. Gomes ; José C. Marques ; Castorina S. Vieira. Vol. 2 CRC Press/Balkema, 2018. pp. 1197-1202

@inproceedings{fc83c98c16b44d2fa2f67ba63a070c96,

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

abstract = "The basal stability of deep excavations in clay is often analysed using the classical approaches of Terzaghi (1943) and Bjerrum & Eide (1956). Terzaghi{\textquoteright}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.",

author = "T. Santana and Silva, {M. Vicente da} and Ant{\~a}o, {A. N.} and Guerra, {N. C.}",

year = "2018",

language = "English",

isbn = "9781138544468",

volume = "2",

pages = "1197--1202",

editor = "Cardoso, {Ant{\'o}nio S.} and Borges, {Jos{\'e} L.} and Costa, {Pedro A.} and Gomes, {Ant{\'o}nio T.} and Marques, {Jos{\'e} C.} and Vieira, {Castorina S.}",

booktitle = "Numerical methods in geotechnical engineering IX",

publisher = "CRC Press/Balkema",

note = "9th European Conference on Numerical Methods in Geotechnical Engineering, NUMGE 2018 ; Conference date: 25-06-2018 Through 27-06-2018",

}

Santana, T , Silva, MVD , Antão, AN & Guerra, NC 2018, Two dimensional upper and lower-bound numerical analysis of the basal stability of deep excavations in clay. in AS Cardoso, JL Borges, PA Costa, AT Gomes, JC Marques & CS Vieira (eds), Numerical methods in geotechnical engineering IX. vol. 2, CRC Press/Balkema, pp. 1197-1202, 9th European Conference on Numerical Methods in Geotechnical Engineering, NUMGE 2018, Porto, Portugal, 25/06/18.

Two dimensional upper and lower-bound numerical analysis of the basal stability of deep excavations in clay. / Santana, T.; Silva, M. Vicente da ; Antão, A. N. et al.
Numerical methods in geotechnical engineering IX. ed. / António S. Cardoso; José L. Borges; Pedro A. Costa; António T. Gomes; José C. Marques; Castorina S. Vieira. Vol. 2 CRC Press/Balkema, 2018. p. 1197-1202.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - Two dimensional upper and lower-bound numerical analysis of the basal stability of deep excavations in clay

AU - Santana, T.

AU - Silva, M. Vicente da

AU - Antão, A. N.

AU - Guerra, N. C.

PY - 2018

Y1 - 2018

N2 - 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.

AB - 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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M3 - Conference contribution

AN - SCOPUS:85061335729

SN - 9781138544468

VL - 2

SP - 1197

EP - 1202

BT - Numerical methods in geotechnical engineering IX

A2 - Cardoso, António S.

A2 - Borges, José L.

A2 - Costa, Pedro A.

A2 - Gomes, António T.

A2 - Marques, José C.

A2 - Vieira, Castorina S.

PB - CRC Press/Balkema

T2 - 9th European Conference on Numerical Methods in Geotechnical Engineering, NUMGE 2018

Y2 - 25 June 2018 through 27 June 2018

ER -

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

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