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TECHNICAL NOTES
Mar 1, 1990

Analysis of Pressure Distribution under Falling Weight Deflectometer Loading

Publication: Journal of Transportation Engineering
Volume 116, Issue 2

Abstract

An analysis of the pressure distribution beneath the loading plate of a falling weight deflectometer is presented. The analysis is conducted in two stages: (1) Rigid plate deformation shapes without the rubber pad are obtained for uniform and parabolic pressure distributions; and (2) a rubber pad is inserted between the loading plate and the pavement, and the resulting pressure distribution is evaluated for the extreme cases of rigid and soft pavements. It is shown that a uniform pressure distribution can be achieved only for the case when, under the same uniform pressure, the deformed shapes of the loading plate and the pavement surface are identical. Without the rubber pad, the pressure distribution can be highly nonuniform, with a pressure concentration near the center or the rim of the loading plate. When the rubber pad is inserted between the loading plate and the pavement, the pressure distribution is close to uniformity, within about 10% between the center and the rim of the plate. Therefore, with the rubber pad inserted, the assumption of uniform pressure distribution, which is commonly made in back-calculation analysis, is a viable approximation.

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References

1.
Borowicka, H. (1936). “Influence of rigidity of a circular foundation slab on the distribution of pressures over the contact surface.” Proc., Int. Conf. Soil Mechanics, Cambridge, Mass., 2, 146–169.
2.
Bush, A. J. (1980). “Nondestructive testing for light aircraft pavements, phase II: Development of the nondestructive evaluation methodology.” Report No. FAA‐RD‐80‐9‐II, Final Report, Federal Aviation Administration, 123.
3.
Terzaghi, K. (1963). Theoretical soil mechanics, John Wiley and Sons, Inc., New York, N.Y.

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Go to Journal of Transportation Engineering
Journal of Transportation Engineering
Volume 116Issue 2March 1990
Pages: 246 - 250

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Published online: Mar 1, 1990
Published in print: Mar 1990

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Jacob Uzan
Assoc. Prof. of Civ. Engrg., TECHNION, Haifa, Israel, on sabbatical leave at Texas Transp. Inst., Texas A&M Univ., College Station, TX 77843
Robert L. Lytton
Prof. of Civ. Engrg., Res. Engr., Texas Transp. Inst., Texas A&M Univ., College Station, TX

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