الفهرس 
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Abstract
Barrier walls structures are a typical way for controlling contaminant transport through the
soil. The steel sheet piles are ideal construction for controlling and delaying seepage and
contamination transfer through the soil. Due to imperfections of sealing, corrosion, or due
to accidental damage, a slot is occurred in the sheet pile at a depth below the ground
surface. The slot allows water and contaminant to pass through it.
The current study investigates the effect of defects in steel sheet pile on seepage and
contaminant transport whenever the slots at various distances from the ground surface
occurred. A numerical model (Geo-Studio) based on the Finite Element Method was used
to solve the seepage and contamination transport through the soil. The present research is
a two-dimensional study considered the following parameters: sheet pile depths, soil
hydraulic conductivity, head difference between upstream and downstream pile,
dimensions of the slot, and distance between the contamination source and the sheet pile.
Generally, and based on the results, it can be concluded that the effect of defect on the
water flow through soil increased and the contaminant reached faster to downstream the
sheet pile. Equations give accurate time for traveling of contaminant through the slot in
polynomial form are presented. In additional, accurate equations have been deduced to
calculate the flux through the gap and under the sheet pile for the cases under study.
Graphical relationships were made between the variables affecting the studied cases.