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identified this phenomenon early on and studied the influence of grain breakage,
especially in laboratory tests. Indeed, grain breakage caused the appearance of finer
particles and the changes in the grading curve of the material significantly altered its
behavior. This phenomenon usually resulted in an increase in compressibility (see
Figure 2.14), a decrease in dilatancy and a decrease in the value of internal friction
at peak.
Figure 2.14.
Increase in compressibility for breakable grains during oedometer tests on
narrowly graded silica sand (from [BIA 97])
Figure 2.15.
Evolution of the grading curve during oedometer tests on samples of
crushed granite with a broadly graded G1 (d
60
d
10
=10
) or a narrowly graded
G2 (d
60
d
10
= 2
) particle size distribution (from [BIA 97])
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