Unknown
Taylor & Francis
In:
Geomechanics and Geoengineering, 12 (4). pp. 221-233.
Publication Date:
2018-12-17
Description:
The progressive bond breakage of artificially cemented sands induced by shear straining was
investigated through conventional isotropically consolidated drained triaxial compression tests.
Sand specimens were prepared with a low degree of cementation by adopting a chemical grout.
Test results were interpreted in terms of two stress–dilatancy theories for cohesive-frictional materials proposed in literature. The influence of debonding on the stress–dilatancy behaviour of cemented sands was analysed with particular emphasis on the ‘delayed dilatancy’ phenomenon.
A bonding degradation curve was determined for each test relating the interparticle
cohesion (c) to the magnitude of the total plastic strain vector (εd) and a bond degradation rate factor (Dc) was assessed from each curve. The maximum value of interparticle cohesion (c0) before the onset of bond degradation under shearing was found to correspond with a sharp decrease in the soil stiffness of the specimens. The influence of the effective confining stress (p′c)on both c0 and Dc parameters gathered from each test was also ascertained.
Type:
Article
,
PeerReviewed
Format:
text
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