effect of particle shape on mechanical behavior of fibre...
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Effects of fibre inclusion on sand failure Effects of fibre inclusion on 𝜀𝑎-q relationshipIntroduction
Using of fibres as the main
technique to reinforce soil has been
widely used in construction
especially in consolidated
foundation. As a result, a great
numbers of researchers focus on
exploring the mechanics behavior of
soil with adding fibers
reinforcement (Pino & Baudet,
2015). However, most of the
researches have devoted to find the
advantages of fiber inclusion on
increasing soil’s shearing strength.
Few studies have focused on the
effect of particle size on fibre-
reinforcement. Therefore, this study
will investigate the mechanical
behavior of two fibre-reinforced
sands with different particle sizes. A
series of drained triaxial
compression tests have been carried
out. The fibre content is 0.25%
(weight fraction) for all the samples.
• Pino, L. F. M., & Baudet, B. A. (2015). The effect of the particle size distribution on the mechanics of fibre-reinforced sands under one-dimensional compression. Geotextiles and Geomembranes, 43(3), 250-258.
• Head, K.H (1982). Manual of Soil Laboratory testing. 2nd ed. London: Plymouth: Pentech Press. 335-743.
Effect of particle shape on mechanical behavior of fibre-reinforced sandStudent Name: Weifei Sheng (2110827) Tutor: Dr. Zhiwei Gao
Figure 1: Failure curves for pure sand and fibre-reinforced sand
with fine particles in the p-q plane.
Figure 2: Failure curves for pure sand and fibre-reinforced sand
with coarse particles in the p-q plane.
• Fiber inclusion can increase the shear strength of both
fine and coarse sand.
• The failure lines for pure sand and fibre-reinforced sand
with fine particles are almost parallel.
Figure 3: Relationship between axial strain (𝜀𝑎) and deviator stress (q) for fine sand specimen.
Figure 4: Relationship between axial strain (𝜀𝑎) and deviator stress (q) for coarse sand specimen.
Fibre inclusion can
• Increase the shear strength of sand (q at failure is higher
for fibre-reinforced sand).
• Increase the axial strain at failure
• Reduce the amount of strain softening
Effects of fibre inclusion on 𝜀𝑣 − 𝜀𝑎 relationship
Figure 5: Relationship between volumetric strain (𝜀v) and axial strain (𝜀𝑎) for fine sand specimen.
Figure 6: Relationship between volumetric strain (𝜀v) and axial strain (𝜀𝑎) for coarse sand specimen.
Fibre inclusion can
• Increase the amount of volumetric expansion for both of
the fine sands and coarse sands.
Effects of fibre inclusion on sands failure mode
Figure 7 (d)Figure 7 (a) Figure 7 (b) Figure 7 (c)
Figure 7 (a) to (d) represent the sands failure modes for fine sand without
fibres, fine sand with fibres, coarse sand without fibres and coarse sand
with fibres. Fibre inclusion can change the sands failure mode from brittle
failure to plastic failure (Head, 1982), and this effect is more obvious in
coarse sands.
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