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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/1475

Title: APPROPRIATE SOLUTION FOR IMPEVIOUS CORE OF EMBANKMENT DAMS TO BE CONSTRUCTED USING HIGHLY PLASTIC SOILS
Authors: WULETAW, ADANE
Advisors: Dr. HADUSH SEGED
Copyright: 2007
Date Added: 17-Oct-2008
Publisher: Addis Ababa University
Abstract: ABSTRACT For a long time, highly plastic clays (CH soils) have been used extensively as impervious core material for many zoned embankment dams all over the world. In Ethiopia several dams are currently under construction (e.g. Tendaho dam) and more are planned to be constructed (e.g. Ribb, Megech, Meqa dams, etc.) using predominantly CH soils as the most available impervious core material. Nevertheless, several problems are associated with CH soils. The most common problems include high compressibility when saturated, potential for high swelling and cracking, slow rate of construction for safe dissipation of pore water pressure, large difference in stiffness with the surrounding shell materials leading to differential deformation, difficulty in moisture control during construction, and requiring extremely fine filters that can not be easily obtained or produced on site. In this thesis, a study has been conducted on the effects of blending the CH soils with naturally available granular materials using several laboratory tests. The laboratory tests include Atterberg limits, permeability, compaction, 1D-consolidation, and triaxial compression tests on samples collected from Tendaho dam site. The test results clearly reveal that blending with granular soils greatly improves the physical and mechanical behaviours of the CH soils. Based on the test results, an appropriate blending ratio has been recommended for the CH soils used in Tendaho dam.
Description: A THESIS SUBMITTED TO THE SCHOOL OF GRADUATE STUDIES OF ADDIS ABABA UNIVERSITY IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE IN CIVIL ENGINEERING)
URI: http://hdl.handle.net/123456789/1475
Appears in:Thesis - Civil Engineering

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