Identifying hydrodynamic soil parameters of Hweez dam in Lattakia which needed to build mathematical model for Predicting the Water Content Distribution using the Simulation Program PCSiWaPro®

In this paper, we focus on the importance of conducting the necessary tests either field or laboratory in order to obtain realistic values for soil hydrodynamic parameters allowing the best result to simulate the actual situation of any engineering facility. The importance of this research highlights in earth dams and dikes which have great importance to economic, environmental and human. It is necessary to be complete accuracy when creating a mathematical model to study stability of these structures. From here comes the need to calculate these parameters rather than extracted from engineering codes, that we will use them to simulate the effect of long rainfall on the distribution of water content in the Hweez dam soil and hence its stability. We will build a mathematical model for dam using PCSiWaPro® depending on transition flow chart. concerning that, hydraulic conductivity and volumetric water content in the soil are functions of pore water pressure. These equations with their functions give a smooth transition of the studied model where the saturated state is considered as a special case of the used equations.

Analysis the Effect of soil permeability on stability of the upstream shell of the dam under rapid drawdown(Braddon dam)

The stability of the upstream shell of the dams is changed under the rapid drawdown condition where the pore water pressure has a different values according to the soil permeability. This paper considers the stability of the upstream shell of the "Braddon" dam with many types of soil and analyses each type under two rapid drawdown programs, the first program is when the discharge happens, according to the irrigation outlet by 25 m3/s, and the second program is when the discharge happens according to the tunnel conversion of the river by 500 m3/s. The obtained results show, that the stability of the upper slope under considered boundary conditions changed according to the soil type. Some soil have good stability factor while other soil collapsed .Accordingly, we can conclude that the type of soil of the upper dam slope is important and we could chose the appropriate type which does not cause dangerous during the rapid drawdown. Also the study shows that: the highest values of the safety factors result when the slopes are formed of high permeability soils as well as the slopes of homogeneous soil, while the soils formed of materials between them appeared decreasing values of safety factors.