期刊名称：Journal of Earth Sciences and Geotechnical Engineering
印刷版ISSN：1792-9040
出版年度：2018
卷号：8
期号：2
语种：English
出版社：Scienpress Ltd
摘要：Mosul and Haditha Dams are built on relativelyweak foundations. Both of these foundations suffer from extensive karsts whichhad demanded intensive foundation treatment works among other designprecautions. The karst forms; however, are of different origins, activities,nature and shapes. The foundation treatment in both dams was done mainly byconstructing deep grout curtains along with other secondary grouting works.Reducing uplift pressure under the dam and cutting down on seepage losses werethe major considerations in these works. An additional important requirement inMosul Dam was to reduce the permeability of the rock formation in thefoundations to such a low limit that it can stop the dissolution of gypsum bedspresent there. This objective; unfortunately, failed due to the lithologicalcomposition of this foundation and the presence of many brecciated gypsum beds,which could not be treated successfully. This had resulted in a comprehensivegrouting maintenance program which continuous up to date with the everlastingdanger of dam failure. On the other hand, in Haditha dam no such complicationoccurs as the dam had its foundations mainly in limestone. Proper investigationand good planning and performance of the grouting works in this dam contributedhighly to its success. Selecting the deep grout curtain as anti-seepage measurein Mosul Dam was not a very wise decision and constructing a positive cutoff inthe form of diaphragm wall could have been the proper choice. Good and deepunderstanding of all geological data can contribute to the success of a damdesign or, otherwise it may lead to unsafe one.Keywords: MosulDam, Haditha Dam, Karst,Sinkholes, Gypsum, Limestone, Grout curtain. Diaphragm
