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Re: Deep Slab

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Take a look at the following US Army Corps of Engineers  publications: 

Publication Number: EM 1110-2-2104
Title: Engineering and Design - Strength Design for Reinforced Concrete 
Hydraulic Structures (Shear Criteria)

Publication Number: EM 1110-2-2902
Title: Engineering and Design - Conduits, Culverts, and Pipes 

Web Address:

You did not give much information on the use of this culvert such height of 
fill and where it will be used, etc.  Have you considered that there maybe 
another alternative such as a bridge?  A 30 m X 30 m double barrel box 
section is really extreme.

Bob Conley, P.E.