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Infinite Boundaries and element selection

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engineer010

Civil/Environmental
Joined
Feb 1, 2010
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7
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IE
I am building the cross section for a tunnelling project within ansys!
Which element type should be used for soil, keeping in mind the Model is basically a rectangle with a semi circlular shape cut from it which will be the tunnel and the lines which are not part of the tunnel diameter need to have infinite boundaries (I have found alot of elements cannot be meshed due to the area of the semi circle from the tunnel)?

Many thanks
 
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