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By E Tutumluer; Imad L Al-Qadi

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Model prediction compared with experimental data for drained triaxial shearing (Salim & Indraratna, 2004). Rails Winged concrete sleepers Figure 5. Sleepers with enlarged ends to increase the confining pressure (Indraratna et al. 2004). using intermittent lateral restraints at various parts of the track (see Figure 6). The effect of confining pressure on ballast under cyclic loading to reduce the volume of breakage has been studied by Indraratna et al. (2005) and Lackenby et al. (2007) to find out the optimum confining pressure based on loading and track conditions.

Examining ballast and subgrade conditions. , AREA, 39–42. 23 Esveld, C. (2001). Modern Railway Track, MRT-Productions, Netherlands. G. (1970). Factors influencing the resilient properties of granular materials. PhD thesis, University of California. , Darve, F. K. (2007). DEM analysis of angular ballast breakage under cyclic loading Geomechanics and Geoengineering: An International Journal, Vol. 2 (3): 175–181. , Ionescu, D. and Christie, D. (1998). Shear behaviour of railway ballast based on large-scale triaxial tests, Journal of Geotechnical and Geoenvironmental Engineering, ASCE, 124(5): 439–439.

The new program is known by its acronym, FAARFIELD. A substantially rewritten Advisory Circular (AC) will make FAARFIELD the FAA’s standard thickness design procedure for both rigid and flexible pavements, including overlays, and will retire the old nomograph-based design procedures. The FAA is also providing new software products for the aviation community: COMFAA for PCN evaluation; BACKFAA for backcalculation from FWD data; ProFAA for computing pavement roughness indexes; and PAVEAIR, FAA’s forthcoming software for comprehensive airport pavement management.

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