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Foundation for House on Lake-Shore with Slate Rock

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sjhgeotech

Geotechnical
Joined
May 8, 2006
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17
Location
US
We are designing a 2 story, 2500 sf house to sit on a lake-side slope, where the slope of the earth is about 45 degrees to the edge of water. There is highly fractured shale just below 6 inches of slag material on the side of the hill. I am looking for some ideas on foundation types. Thought about going with drilled concrete piers that penetrate the slate to a certain depth but I am not sure if there is a cheaper alternative. We could possibly use caissons that are tied into the rock with grouted rebar, also. Any ideas?

Thanks!
 
How close to the top of slope, how high is the slope?

Is the bedding of the slate / shale in your favor?
 
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