TY - JOUR
DP - National Agricultural Library
DB - PubAg
JO - Engineering geology
TI - Peak shear strength of compacted GMZ bentonites in saline solution
A1 - Xu, Yongfu
A4 - Xu, Yongfu
EP - 2019 v.251
KW - bentonite
KW - cohesion
KW - friction
KW - models
KW - radioactive waste
KW - shear strength
KW - sodium chloride
AN - 6306467
AB - Knowledge of the peak shear strength of compacted bentonites is of fundamental importance to high-level nuclear waste repositories, as it forms the basis of the analysis of repository stability. The shear strength properties of GMZ bentonites are throughout investigated by undrained direct shear tests with different concentrations of NaCl solutions, and are explained in the light of the modified effective stress concept, which takes into consideration of the osmotic suction. The modified effective stress concept is expressed as p’ = p + π(p/π)Ds-2, incorporated with the normal stress (p) and osmotic suction (π) based on the bentonite surface fractal model. The peak shear strength behavior of GMZ bentonites in NaCl solutions appears to be explained satisfactorily by the modified effective stress. According to the Mohr-Coulomb criterion, the peak shear strength of bentonites saturated by distilled water and NaCl solutions is expressed by the same unique line in the τ-p’ plane. GMZ bentonite has the same values of the peak friction angle and the peak cohesion in distilled water and NaCl solutions of different concentrations.
PY - 2019
LA -
DA - 2019-03-09
VL - v. 251
SP - pp. 93-99
DO - 10.1016/j.enggeo.2019.02.009
ER -