01334251

Component

This paper addresses the estimation of layered elastic moduli from continuous compaction control (CCC) and intelligent compaction (IC) roller based measurements and its connection to moduli used in mechanistic-empirical (M-E) design. Because roller measured soil stiffness ks provides a composite reflection of layered response in many typical pavement earthwork conditions, estimating layer moduli from roller measurements requires the extraction of layer moduli via backcalculation. The influence of elastic modulus and layer thickness on roller measured ks is presented for a two-layer system using a pseudo-static boundary element method (BEM) analysis. A backcalculation procedure is introduced to extract top layer modulus E1 from roller measurements. Using the model sensitivities and measurement error, the error associated with backcalculated top layer modulus E1 is presented for a range of typical earthwork conditions. The forward model sensitivities and measurement error strongly influence the ability to backcalculate E1. Using typical measurement error levels, the uncertainty in backcalculated E1 can be significant for layered conditions, particularly thin aggregate base layers.

01329018

11-1090

English

14p

2011

Transportation Research Board 90th Annual Meeting

DVD

Figures (8) ; References (23)

Backcalculation; Earthwork; Layered soils; Measurement; Modulus of elasticity; Pavement design; Road rollers; Stiffness; Vibratory compaction

Intelligent compaction; Vibratory rollers

Construction; Highways; Pavements; I52: Construction of Pavements and Surfacings

Transportation Research Board Annual Meeting 2011 Paper #11-1090

TRIS, TRB

Feb 17 2011 5:40PM