Finite element analysis of construction stability of Thika Dam |
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| Authors: | RA Day DW Hight DM Potts |
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| Institution: | aDepartment of Civil Engineering, The University of Queensland, St Lucia, 4072, Australia;bGeotechnical Consulting Group, 1a Queensburry Place, London SW7 2DL, UK;cDepartment of Civil Engineering, Imperial College of Science Technology and Medicine, London SW7 2BU, UK |
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| Abstract: | High pore water pressures were measured in the fill material of the Thika Dam embankment early in its construction. These caused concern about the subsequent short term stability. Therefore construction was stopped. Stability reassessment and drainage design was performed using finite element analyses before construction was allowed to continue. Different methods of modelling the pore water pressure allowed efficient analysis of various drainage options. The analyses highlighted zones of high shear stress and shear strain, and formation of failure surfaces. They established the necessary level of drainage required to ensure stability, control movement and reduce the risk of residual shear surfaces. Large toe movement was predicted immediately after construction recommences. © |
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