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XFEM Method for Crack Propagation in Concrete Gravity Dams

XFEM Method for Crack Propagation in Concrete Gravity Dams Cracks should always be examined while building new dams to assess the reliability of existing ones. A precise assessment of concrete dam performance is imperative for forecasting future and existing cracks and seismic capacity. The potential of concrete dams to withstand seismic movement depends on the ability to analyze downstream and upstream face movement. For the investigation of seismic instabilities, the Koyna dam was chosen due to its correlation with respect to the dam as well as foundation regions. A study on the influence of cracks and crack propagation was carried out by considering dam-reservoir-foundation interaction. Cracks are assumed to form where the tensile stresses exceed the allowable permissible limit. Cracks have been modelled by using the eXtended Finite Element Method (XFEM). From the seismic stress analysis of Koyna dam, it is observed that the zones of high tensile stress that exceed the tensile strength of concrete are given as follows: on the downstream neck, the dam foot, the gradient change point, and at a height of 55 m and 85 m above the dam base on the reservoir side. The Koyna dam is studied under various initial cracking conditions. The influence of the initial crack position on the crack propagation mechanism caused by the seismic response is investigated. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of The Institution of Engineers (India):Series A Springer Journals

XFEM Method for Crack Propagation in Concrete Gravity Dams

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Publisher
Springer Journals
Copyright
Copyright © The Institution of Engineers (India) 2022
ISSN
2250-2149
eISSN
2250-2157
DOI
10.1007/s40030-022-00636-2
Publisher site
See Article on Publisher Site

Abstract

Cracks should always be examined while building new dams to assess the reliability of existing ones. A precise assessment of concrete dam performance is imperative for forecasting future and existing cracks and seismic capacity. The potential of concrete dams to withstand seismic movement depends on the ability to analyze downstream and upstream face movement. For the investigation of seismic instabilities, the Koyna dam was chosen due to its correlation with respect to the dam as well as foundation regions. A study on the influence of cracks and crack propagation was carried out by considering dam-reservoir-foundation interaction. Cracks are assumed to form where the tensile stresses exceed the allowable permissible limit. Cracks have been modelled by using the eXtended Finite Element Method (XFEM). From the seismic stress analysis of Koyna dam, it is observed that the zones of high tensile stress that exceed the tensile strength of concrete are given as follows: on the downstream neck, the dam foot, the gradient change point, and at a height of 55 m and 85 m above the dam base on the reservoir side. The Koyna dam is studied under various initial cracking conditions. The influence of the initial crack position on the crack propagation mechanism caused by the seismic response is investigated.

Journal

Journal of The Institution of Engineers (India):Series ASpringer Journals

Published: Apr 21, 2022

Keywords: Concrete gravity dam; Seismic analysis; Crack propagation; Initial cracks; XFEM

References