Average: ur _____________________
Effective modulus of subgrade reaction k (lb/in3) ________
Corrected for loss of support (Fig. 3.14): k (lb/in3) ________
Conversions: 1 lb/in2 6.895 10
3 MPa, 1 lb/in3 271.4 10
4 N/mm2
, 1 in 25.4 mm, 1 ft 0.305 m.
Source: Guide for Design of Pavement Structures, American Association of State Highway and
Transportation Officials, Washington, D.C., 1993, with permission.