TY - JOUR ID - TI - A Practical Geotechnical Analysis of in situ Stress Variations and Hydraulic Stability of Small Weirs Using SEEP/W and SIGMA/W Simulation AU - Riaed S. Al Siaede PY - 2019 VL - 60 IS - 11 SP - 2457 EP - 2467 JO - Iraqi Journal of Science المجلة العراقية للعلوم SN - 00672904 23121637 AB - Geotechnical soil problems underneath foundation of hydraulic structures occursdue to engineering soil properties, geological setting and hydraulic properties of theprojects. Two finite element programs of Geoslope 2012 software, SIGMA/W andSEEP/W, were used for analysis of in situ stresses, load deformation behavior,seepage quantity and vertical gradient below Teeb weir foundation, to computefactors of safety against seepage uplift. The site soil is a granular (gravel, sand andsilt), weakly cemented soil cohered by gypsum and clay materials. The area has lowlying topography, with slightly tectonic activities. The model results show that theupstream side stresses are reduced while the pore pressure are increased, indicatingdecreased stability. Soil displacement and settlement were measured and the effectsof these displacements on the low cemented soil particles were discussed. Thepressure distribution and vertical hydraulic gradient measured and used for analyzethe weir stability. Finally, the soil potential failure zones were drawn to fix the mainrisks in each sides of the weir.

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