EFFECTS OF FINES AND FINES TYPE ON UNDRAINED BEHAVIOUR OF SANDY SOILS UNDER CRITICAL STATE SOIL MECHANICS FRAMEWORK

摘要

The steady state line, SSL for sandy soil moves downward with increasing fines content, f_c up to a limiting f_c, then it moves upward with increasing f_c. Thus, one cannot have a single framework within critical state soil mechanics, CSSM. However, equivalent granular void ratio, e~* instead of e was proposed by many researchers to achieve a single framework based on the studies on a host sand withrna single fines type. But, the effects of fines type have not been studied in details. This paper discusses the effects of fines type using triaxial tests on a host sand with two types of fines. The experimental results are then synthesized in terms of e~*. The prediction approach is used to obtain e~* instead of backrnanalysis as reported in many publications. A single trend for SS data points is achieved in e~*–log(p') space irrespective of fines type. The effective stress path and stress-strain behaviour for clean sand and sand with two types of fines are consistent within a CSSM framework.