Abstract
The Karolinka earth-fill dam was constructed between 1977 and 1984 on the Stanovnice river above the town of Karolinka in the region of Vsetínsko in Czech Republic. Because of leakage on the downstream dam face due to technological indiscipline when filling dam layers during the dam construction stage, there were some steps to improve state dam safety. The final rehabilitation is to construct the diaphragm walls from self-hardening cement-bentonite suspension along the length of the dam. In addition to connecting the gallery and abutment (2 × 25 m long) by using jet piles. The article presents numerical modeling of safety factor evaluation associated with the state of the dam body and foundation; before, and after sealing. Also, studying the effect of dam height on its stability by using finite element method is performed by the Plaxis 3D program in the case study of Karolinka dam. It is concluded that measured data shows good agreement with the computed result.
Highlights
The Limit equilibrium LE has been used for analyzing the slope stability and geotechnical structures safety since 1930
A slope stability analysis was presented for two cases: 1- Diaphragm walls in the middle, 2- Jet piles in the end at both sides of dam using numerical modeling with Plaxis program. 10-node tetrahedral elements and the Mohr-Coulomb yield criterion are used (Bredy, et al, 2019)
Plaxis will continue to adjust the incremental change in C and/or Phi as if it is looking for the minimum safety factor
Summary
The Limit equilibrium LE (conventional slip circle analysis) has been used for analyzing the slope stability and geotechnical structures safety since 1930. LE methods sum forces and moments related to an assumed slip surface passed through a soil mass. It assumes a slip surface and the soils along this surface, providing shear resistance. The problems of complex geometries, or those that require seepage analysis, consolidation, and fully coupled flow-deformation analysis, FEM would be better (Fattah, et al, 2016). It demonstrates the geometry of failure surfaces, clear the deformations in soils with their exact place, and simulate failure mechanism as well. A slope stability analysis was presented for two cases: 1- Diaphragm walls in the middle (dam height 39.1m), 2- Jet piles in the end at both sides of dam (dam height 11.06m) using numerical modeling with Plaxis program. 10-node tetrahedral elements and the Mohr-Coulomb yield criterion are used (Bredy, et al, 2019)
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