SOME RELATIONSHIPS BETWEEN SHRINK （一些收缩之间的关系）.pdfVIP

SOME RELATIONSHIPS BETWEEN SHRINK-SWELL INDEX, LIQUID LIMIT, PLASTICITY INDEX, ACTIVITY AND FREE SWELL INDEX 1 2 Samudra Jayasekera and Abbas Mohajerani 1Lecturer, School of Science and Engineering, University of Ballarat 2Senior Lecturer, School of Civil and Chemical Engineering, RMIT University SUMMARY Many laboratory experimental methods have been proposed to measure soil reactivity, some methods leading to direct measurement whilst other methods propose indirect estimations. Reactivity measurements based on plasticity properties appear to be commonly used and preferred over many other methods in the identification of soil expansivity, which may be due to the simplicity and easiness of test procedure. In this study, volume change potentials of several clay soil samples, containing different percentages of montmorillonite clay, are evaluated using shrink-swell index (Iss), indirect estimations based on liquid limit (LL), plasticity index (PI), activity (A) and a new approach based on free swell index (FSI). The analysis of test results presented in this paper shows that FSI could be a satisfactory indicator for the classification of the volume change potential of clayey soils. INTRODUCTION A reactive soil is one that exhibits a reasonable tendency to volume changes (shrinkage and swelling) in response to a variation in the moisture content within the soil mass. Occasionally, soils that exhibit such volume change characteristics are also referred to as expansive soils or swelling soils. Most clay soils are reactive to a greater or lesser degree depending on the type, amount and mineralogical properties of clay