CUMDAM - CR96_140015

Table 1. Results of regression analyses--test soils from Mn/ROAD-continue

CR96_14
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Table 1. Results of regression analyses--test soils from Mn/ROAD.

A. Frozen condition.

Equation (Mr in

Clay subgrade sample 1206 (565)

Mr = 1, 087 f (wu )-5.259

Mr = 1, 049 f (wu-g )-2.344

Mr = 1, 052 f (wu- v )-2.929

Clay subgrade sample 1232 (566)

Mr = 905 f (wu )-4.821

Mr = 846 f (wu- g )-2.16

Mr = 848 f (wu- v )-2.633

Class 3 "stockpile"

Mr = 5, 824 f (wu )-2.026

Mr = 5, 488 f (wu- g )-1.076

Mr = 5, 542 f (wu- v )-1.249

Class 4 (taxiway A subbase)

Mr = 2, 826 f (wu )-5.220

Mr = 1, 813 f (wu- g )-1.733

Mr = 1, 652 f (wu- v )-2.813

Class 5 (dense graded stone)

Mr = 11, 320 f (wu )-2.036

Mr = 8, 695 f (wu-g )

Mr = 9, 245 f (wu- v )-1.489

Class 6 "stockpile"

Mr = 19, 924 f (wu )-1.243

Mr = 19, 427 f (wu-g )-0.795

Mr = 19, 505 f (wu- v )-0.897

layers resulting from calculations, and 3)

stress conditions for all points specified.

For this study, the points specified were

located 0.01 in. above the bottom of the

asphalt or PCC and 0.01 in. below the top

of the subgrade. In the program, a 4090-kg

(9,000-lb) load was applied to a 15-cm

(5.91-in.) radius, which approximates the

area of a standard set of dual wheels or a

falling weight deflectometer ( FWD) test-

γ d = 105 lb/ft3

The program CUMDAM calculates

cumulative damage to the pavement struc-

Deviator Stress

ture, and was developed at CRREL. In

Figure 8. Stress dependence of resilient modulus in station

general form, the procedure used for

1206 clay subgrade material (from Bigl and Berg 1996a).

CUMDAM's calculations is the linear

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