Modeling of Mn/ROAD test sections with the CRREL mechanistic pavement design procedure

Original publisher: Hanover, NH : U.S. Army Corps of Engineers, Cold Regions Research & Engineering Laboratory ; Springfield, VA : NTIS [distributor, 1996] OCLC Number: (OCoLC)36555140 Subject: Pavements -- Minnesota -- Design and construction -- Mathematical models. Excerpt: ... Table 22.. GGeenneerraall ffoorrmm ooff rreessiliileiennt t mmoodduululus s ( M ( M ) ) e qequautaitoinosn su suesde di nin r r TRANSFORM. Condition Equation 2 FC2 M ( lb / in. ) = FC1 f ( w ) Frozen r u − g TC2 2 TC3 TC4 Partially thawed M ( lb / in. ) = TC1 ( 100 ) f ( γ ) f ( σ ) r m TC2 2 TC3 TC4 Thawed, negative pore pressure M ( lb / in. ) = TC1 f ( S ) f ( γ ) f ( σ ) r m TC2 2 TC3 TC4 Thawed, positive pore pressure M ( lb / in. ) = TC1 ( 100 ) f ( γ ) f ( σ ) r m Notes: FC1, FC2 = regression coefficients for the frozen condition f ( w ) = w / w β u - g u - g o T α w = grav. unfrozen water content ( decimal ) = u - g T 100 0 w = unit water content ( 1.0 ) o β, = unfrozen water content constants α T = temperature, ° C T = 1.0 ° C 0 TC1 - TC4 = regression coefficients for the thawed condition f ( S ) = S / S o S = degree of saturation ( % ) S = 1.0 % o f ( ) = / γ γ γ d o 3 = dry density ( Mg / m ) γ d 3 γ = 1.0 Mg / m o 2 σ = stress ( lb / in. ) f ( ) = a mean value of either f ( ) = J / σ σ σ m 1 1 o σ σ or f ( ) = ( J / τ ) / 2 2 oct o σ σ or f ( ) = τ / 3 oct o 2 = 1.0 lb / in. σ o 2 σ σ J = bulk stress ( lb / in. ) = 3 + 1 3 d 2 2 σ σ 3 J = 2nd stress invariant ( lb / in. ) = + 2 σ 2 3 d 3 2 σ τ = octahedral shear stress ( lb / in. ) ( 3 ) 2 / oct d is completely thawed. After complete thawing, thawed predicted moduli, algorithms were added the soil undergoes a 120-day " recovery period. " to TRANSFORM for providing a smoother tran-During this time, the modulus value increases ac-sition in calculated moduli between the frozen cording to a power relationship with about one-and thawed condition. When the soil goes from an half of the recovery taking place in the first 25 u...