PRINCIPLES OF TRANSPORTATION ENGINEERING by DAS ANIMESH & CHAKROBORTY PARTHA

Author:DAS, ANIMESH & CHAKROBORTY, PARTHA [DAS, ANIMESH]
Language: eng
Format: epub
Publisher: PHI Learning

(i) The smooth curve B (Figure 10.4) in which the penetration increases as the pressure is increased and later the rate of increase of pressure gradually decreases. This case requires no further correction to the plot.

(ii) The load does not increase or increases only slightly with the initial increase in penetration, though later, of course, the load starts increasing. This situation may arise when the loading is slightly inclined or the sample has surface irregularities. Some seating load is thus required after which the soil sample starts taking the load. The nature of the curve obtained is shown in curve A in Figure 10.4. In this case, a correction needs to be applied before proceeding to calculate the CBR value. A tangent is drawn to the point on the curve where the change of direction of curvature takes place. The point where the tangent touches the x -axis is taken as the new origin and axes are shifted to that point [109].

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