TY - JOUR

T1 - Liquefaction Assessment of Zefta Barrage in Egypt

AU - Khair, Amany

AU - El-Hadidy, Mahmoud

AU - ELMashad, Mohie Eldin

AU - El-Ashaal, Ashraf

AU - Abdel-Rahman, Khalid

AU - El-Mossallamy, Yasser

PY - 2023/10

Y1 - 2023/10

N2 - The Zefta Barrage is a vital hydraulic structure situated on the Damietta branch of the Nile River. This research mainly aims to evaluate the liquefaction potential under the Zefta Barrage and the associated damage. A range of field and laboratory tests are used to estimate soil parameters in order to construct a two-dimensional finite element model. The probabilistic seismic hazard approach (PSHA) is used to estimate the ground-motion parameters of the operating basis earthquake (OBE) and the maximum design earthquake (MDE) at the Zefta Barrage site considering local site conditions. The obtained response spectra are implemented in the spectral matching methodology to acquire reasonable time histories. The current analysis reveals that the structure is stable against liquefaction for the OBE, but the concrete blocks downstream need an extension to keep the structure a way off the liquefiable zone. On the other hand, for MDE, the downstream part of the structure is affected by liquefaction at the end of the downstream raft. This liquefaction is caused by a layer of liquefied sand occurring at a depth equal to 0.33 m. It is found that the barrage downstream needs limited strengthening to overcome the liquefaction effects.

AB - The Zefta Barrage is a vital hydraulic structure situated on the Damietta branch of the Nile River. This research mainly aims to evaluate the liquefaction potential under the Zefta Barrage and the associated damage. A range of field and laboratory tests are used to estimate soil parameters in order to construct a two-dimensional finite element model. The probabilistic seismic hazard approach (PSHA) is used to estimate the ground-motion parameters of the operating basis earthquake (OBE) and the maximum design earthquake (MDE) at the Zefta Barrage site considering local site conditions. The obtained response spectra are implemented in the spectral matching methodology to acquire reasonable time histories. The current analysis reveals that the structure is stable against liquefaction for the OBE, but the concrete blocks downstream need an extension to keep the structure a way off the liquefiable zone. On the other hand, for MDE, the downstream part of the structure is affected by liquefaction at the end of the downstream raft. This liquefaction is caused by a layer of liquefied sand occurring at a depth equal to 0.33 m. It is found that the barrage downstream needs limited strengthening to overcome the liquefaction effects.

KW - Hydraulic structure

KW - Liquefaction

KW - PSHA

KW - Two-dimensional finite element analysis

KW - UBC3D-PLM model

UR - http://www.scopus.com/inward/record.url?scp=85152444710&partnerID=8YFLogxK

U2 - 10.1007/s40098-023-00714-7

DO - 10.1007/s40098-023-00714-7

M3 - Article

AN - SCOPUS:85152444710

VL - 53

SP - 975

EP - 994

JO - Indian Geotechnical Journal

JF - Indian Geotechnical Journal

SN - 0971-9555

IS - 5

ER -