This was obviously the first deflection parameter which came with the Benkelman Beam. The slope or deflection differences close to the load such as Radius of Curvature (R), Shape Factor (F 1), and Surface Curvature Index (SCI).It has been used for many years as the primary input for several overlay design procedures. The slope or deflection differences in the middle of the basin about 11.8 in.These parameters tend to reflect the relative stiffness of the bound or upper regions of the pavement section. These parameters tend to reflect the relative stiffness of the base or lower regions of the pavement section. The deflections toward the end of the basin. Deflections in this region relate quite well to the stiffness of the subgrade below the pavement surfacing. The subsequent parameters to be presented were developed to provide a means of obtaining the resilient modulus values of the surfacing layers more easily or quickly than full backcalculation. Backcalculation software for pavement full# In general, the success of these regression equations to predict the resilient modulus of the surfacing layers has been limited. There is a clear consensus, however, that the deflections measured beyond the primary effects of the load stress bulb relate quite well to the resilient modulus of the subgrade. Several researchers have developed regression equations to predict the subgrade modulus, E SG, from plate load and deflections measured at distances from about 24 in. (1200 mm) from the center of the plate load. Backcalculation software for pavement full#.
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March 2023
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