what is the best way to calculate the stress' on a subbase under a 3 layer gravel road bed, i.e., 6" of 3/4"-0, over 9" of 1-1/2" -0, over compacted subbgrade (60,000 lb load). Is the 3 layer theory as stated in Yoder/ Witczak (principles of pavement design, 2nd edition) valid for this particular case? Also, when I calculate the stress in the subbase, where would I find typical values of shear strength in various soil types for comparison? Can anyone tell me where I can find typical values for the modulus of elasticity for compacted granular backfill and or various compacted soil types?
thank you in advance.
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