Effect of a stiff thin Foundation soil layer’s depth on dynamic response of an embankment dam

In 2002, Zeyzoun Dam failure, that is an embankment dam located at the northwest of Syria, made a big Awareness of the effects of the lack of Geotechnical investigations and concern given to seismic design, geological conditions and location of the dam. Zeyzoun dam location, in the vicinity of the Dead Sea fault system, emphasizes the importance of analyzing the effects of lithological stratum in dam foundations on dam seismic stability. This paper is concerned with the influence of a high permeable soil layer that has different static and dynamic properties, and exists at different depths in dam foundation. Geo-studio software, a Geotechnical program that applies the finite element method and can consider analysis like seepage, dynamic analysis and slope stability, used to build and analyse numerical models. The results of dynamic analysis showed rising of phreatic line level in dam body, amplification in dam dynamic response, increasing in pore-water and excess pore water pressure and decreasing in stability factors of safety, along with decreasing of the thin layer depth.

Earth dams observer and it's problems

This research study the cause failure earth dams After that it show the more important problems which dams exposure. During its construction and compassingthe importance causes of this case and how we can processing it , and show also the necessary of earth dams observerand the necessary reportsto showing that the work of dam is good. The research also discusses the analysis of earth dam using the Geo slope program. We have chosen many parameters as total stresses, vertical strain , and pore water pressure to study change of this parameters with elevation in the upstream , downstream , and core of dam and draw the requisite graphsgraphs to compare this design values with reading of observer devices to be sure of typical work of dam. Finaly we showing the results and suggest many recommendations.

Choosing some of Geo-geometrical characteristics of the clay soils used in the constructing of soil dams example: ALwagar earth fill dam in ALnabak

The scientific and practical value of this research appears in recognizing the characteristics of the clay soil, which is located in Alnabeck, and used in constructing ALwagar earth fill dam. We will study five samples chosen from the materials site Hofar ALmlagea and which will be used in constructing ALwagar earth fill dam through which some Geo-geometrical characteristics like (Liquid Limit, Plasticity Limit, plasticity index, Consistency Index, Liquidity Index, Clay activity, collapse degree) will be determined. Depending on the Results of this study, we used international classifications (Casagrande classification – Unified Soil Classification System) to study the soil of the studied area. We made use of the results of the experimental study to determine the position of soil according to the international classification, and we suggested some solutions to improve the characteristics of the soil which is used in constructing soil dams.