BGS238 Engineering Geology of Dams Student Handout

BGS238 Engineering Geology of Dams Student Handout - BGS238...

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1 BGS238 PROFESSIONAL SKILLS FOR APPLIED GEOCSIENTISTS Engineering Geology of Dams Engineering Geology of Dams Brain-storm the various geological and engineering aspects of dam construction.
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2 Engineering Geology of Dams What is the purpose of a dam? Do you need to extend your list above to include aspects to do with the reservoir area? Engineering Geology of Dams What will influence the positioning of the dam?
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3 Engineering Geology of Dams How can we work out how big (how high) the dam needs to be? Engineering Geology of Dams Modified from Walter, R. C. S (1962) Dam Geology. Embankments used to create reservoir volume. Eg. Near Heathrow Flat Country Plains Greater than 6 Wide Valleys Between 3 - 6 Narrow Valleys Less than 3 Gorges Chord – Height Ratio Nature of Valley
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4 Engineering Geology of Dams Types of Dam Embankment Dam Arch or Buttress Dam Gravity Dam Engineering Geology of Dams Types of dam Principal design factors Gravity Stability derived from self-weight. Ground anchors can be used to increase stability. Masonry or concrete. Used in narrow to wide valleys with Chord / height ratio 5 to 8 eg Vyrnwy (Wales) =7 and the Three Gorges dam in China Buttress Reinforced concrete buttresses used to transfer thrust to foundation. Used in very wide valleys eg Errochy =10 and Shira =15 (Scotland) Arch dam Stability derived from the curved shape of the dam transferring the forces to the abutments. Reinforced concrete, can be thick (chord/height ratio of 3 – 5) or thin skinned (c/h< 3, radius <150m), single or double curvature. Can withstand large deflections in the foundations IF the deflections are
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This note was uploaded on 03/18/2010 for the course CIVIL ENGI BGS238 taught by Professor Kamrankhan during the Spring '10 term at Pakistan Institute of Fashion Design.

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BGS238 Engineering Geology of Dams Student Handout - BGS238...

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