Construction of pressure relief wells under flowing artesian conditions, Karkheh storage dam - Iran

Mohammad Heidarzadeh, Ali A. Mirghasemi, Faramarz Eslamian, Habib Niroomand, Seyed M. Etemadzadeh

Research output: Chapter or section in a book/report/conference proceedingChapter in a published conference proceeding

1 Citation (SciVal)

Abstract

This article discusses experiences from construction of pressure relief wells under flowing artesian conditions in the downstream of the Karkheh storage dam. Based on the information obtained from monitoring wells installed in the downstream of the Karkheh dam, indicating excess uplift pressure beneath the dam, construction of relief wells was exploited to relieve part of these pressures. The mentioned excess water pressure was produced in a confined conglomerate aquifer bounded above and below by relatively impervious mudstone layers. Further, the water level in the confined aquifer was about 20 m above the ground surface, resulting in artesian conditions. It is known that drilling and installation of relief wells in flowing artesian aquifers is significantly more complex and difficult than that in unconfined aquifers. In addition, such process in large dam sites having giant reservoirs like Karkheh storage dam would be associated with more complexities. In total, 23 relief wells were constructed in the downstream of Karkheh dam. Results showed that a successful process in such conditions requires the following items: drilling fluid to protect excavated walls, surface and driven casing, and grouting. Results indicate that these wells so far (January 2006) could be able to decrease artesian pressure about 25 m, improving the factor of safety by 40%.

Original languageEnglish
Title of host publicationProceedings of the International Symposium on Dams in the Societies of the 21st Century, ICOLD-SPANCOLD - Dams and Reservoirs, Societies and Environment in the 21st Century
PublisherTaylor and Francis/ Balkema
Pages687-693
Number of pages7
ISBN (Print)0415404231, 9780415404235
DOIs
Publication statusPublished - 31 Dec 2006
EventInternational Symposium on Dams in the Societies of the 21st Century, ICOLD-SPANCOLD - Dams and Reservoirs, Societies and Environment in the 21st Century - Barcelona, Spain
Duration: 18 Jun 200618 Jun 2006

Publication series

NameProceedings of the International Symposium on Dams in the Societies of the 21st Century, ICOLD-SPANCOLD - Dams and Reservoirs, Societies and Environment in the 21st Century
Volume1

Conference

ConferenceInternational Symposium on Dams in the Societies of the 21st Century, ICOLD-SPANCOLD - Dams and Reservoirs, Societies and Environment in the 21st Century
Country/TerritorySpain
CityBarcelona
Period18/06/0618/06/06

ASJC Scopus subject areas

  • Building and Construction
  • Civil and Structural Engineering

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