Evaluation of factors affecting parameter m in drained shear strength of over consolidated soils.

摘要

This study presents the results of laboratory direct shear tests on two natural over consolidated clay samples and compacted laboratory over consolidated samples of different mixtures of bentonite sand. The intact shear strength of over consolidated soils can be obtained from tau _oc= tau _NC (OCR)1-m. In that, the intact shear strength of over consolidated soils are higher than shear strength of normally consolidated soils of the same constituent by factor of (OCR)1-m. Application of this relationship for compacted over consolidated soil near optimum water content is considered. The effect of composition on the parameter m is sought. The effect of structure on m is evaluated by comparison of above test results with natural samples and with artificially cemented samples tested in direct shear test. The results show decrease in m value with increasing plasticity and cementation.