Download PDF by E Tutumluer; Imad L Al-Qadi: Bearing capacity of roads, railways and airfields:

By E Tutumluer; Imad L Al-Qadi

ISBN-10: 0203865286

ISBN-13: 9780203865286

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Read or Download Bearing capacity of roads, railways and airfields: proceedings of the 8th International Conference on the Bearing Capacity of Roads and Airfields, Champaign, Illinois, USA, June 29-July 2, 2009 PDF

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Extra resources for Bearing capacity of roads, railways and airfields: proceedings of the 8th International Conference on the Bearing Capacity of Roads and Airfields, Champaign, Illinois, USA, June 29-July 2, 2009

Example text

However, the horizontal stress decreased marginally with depth, as is evident from Figure 25. Figure 26 shows the maximum stress recorded in the ballast for a coal train with 100T wagons. It confirms the same trend for vertical and horizontal stress recorded under the rail and at end of the sleepers. Figure 27 shows the comparison of lateral strain (ε3) against the number of load cycles (N) plotted in a semi-logarithmic scale with results of laboratory studies reported by Indraratna & Salim (2005) using the prismoidal triaxial apparatus.

0 Distrortional strain, εs(%) Figure 4. 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.

This model expresses MR as a function of the sum of principal stresses ( s1′ + s2′ + s3′ ) also known as the bulk stress (Σψμβο) M R = k1ϕ k 2 (6) where k1 and k2 are empirical coefficients. For triaxial tests, due to symmetry in directions (2) and (3), (σ 2′ = σ 3′ ), the sum of the principal stress simplifies to (σ 2′ + 2 σ 3′ ). Figure 10 presents the variation of MR with ϕ for different values of σ 3′ and qmax. It is shown that all values of MR irrespective of σ 3′ and qmax fall within a narrow band.

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Bearing capacity of roads, railways and airfields: proceedings of the 8th International Conference on the Bearing Capacity of Roads and Airfields, Champaign, Illinois, USA, June 29-July 2, 2009 by E Tutumluer; Imad L Al-Qadi


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