Abstract
Geotechnical soil problems underneath foundation of hydraulic structures occurs due to engineering soil properties, geological setting and hydraulic properties of the projects. Two finite element programs of Geoslope 2012 software, SIGMA/W and SEEP/W, were used for analysis of in situ stresses, load deformation behavior, seepage quantity and vertical gradient below Teeb weir foundation, to compute factors of safety against seepage uplift. The site soil is a granular (gravel, sand and silt), weakly cemented soil cohered by gypsum and clay materials. The area has low lying topography, with slightly tectonic activities. The model results show that the upstream side stresses are reduced while the pore pressure are increased, indicating decreased stability. Soil displacement and settlement were measured and the effects of these displacements on the low cemented soil particles were discussed. The pressure distribution and vertical hydraulic gradient measured and used for analyze the weir stability. Finally, the soil potential failure zones were drawn to fix the main risks in each sides of the weir.
Highlights
IntroductionWeirs and ducts are important to protect the areas of flooding and to gather and supply water during drought seasons [1,2]
Hydraulic structures as dams, weirs and ducts are important to protect the areas of flooding and to gather and supply water during drought seasons [1,2]
The construction, operation and maintenance costs of these structures are increased with the unexpected site foundation problems due to the treatment operation to support these types of soil problems
Summary
Weirs and ducts are important to protect the areas of flooding and to gather and supply water during drought seasons [1,2]. The construction, operation and maintenance costs of these structures are increased with the unexpected site foundation problems due to the treatment operation to support these types of soil problems. The Geo-studio software of GEOSLOPE company is a package of geo-engineering software developed to deal with different geotechnical problems This software includes many programs to deal with different geotechnical problems, including SIGMA/W and SEEP/W that were used in this study. SEEP/W is a useful tool that uses numerical modelling to solve complex groundwater seepage problems [9,10,11], while SIGMA/W is a program used to simulate and analyse soil stress distribution, the effect of static load on initial stress redistribution and the nature and amount of resulting deformations [12]. This study uses a practical approach to simulate and solve Teeb weir project model and find soil problems underneath weir structure. To estimate the stability of the foundation against liquefaction by studying pore water pressure distribution model
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