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I have been asked to review a proposed design to stabilise an embankment reservoir using sheet piles.
The embankment is about 7m high with an upstream and downstream slope of about 26 degress. The embankment material is a soft to firm sandy clay. The crest of the embankment is about 7m wide with a 5m wide road built upon it. Tension cracks have appeared at the crest of the dam (near the side of the road) and bulges have appeared at mid slope level. The proposed solution is to sheet pile through the crest into the stiff clay founding layer to intercept the slip planes.
Ive not used sheetpiles to stabile slopes in this way before and have a couple of concerns. Im worried that a tension crack could form between the sheetpile and the embankment material which could fill with water and create hydrostatic pressure onto a slope which is already unstable.
Is it the right solution? Any advice / recomendations would be very welcome.
The embankment is about 7m high with an upstream and downstream slope of about 26 degress. The embankment material is a soft to firm sandy clay. The crest of the embankment is about 7m wide with a 5m wide road built upon it. Tension cracks have appeared at the crest of the dam (near the side of the road) and bulges have appeared at mid slope level. The proposed solution is to sheet pile through the crest into the stiff clay founding layer to intercept the slip planes.
Ive not used sheetpiles to stabile slopes in this way before and have a couple of concerns. Im worried that a tension crack could form between the sheetpile and the embankment material which could fill with water and create hydrostatic pressure onto a slope which is already unstable.
Is it the right solution? Any advice / recomendations would be very welcome.