SWELLING AND SLAKING CHARACTERISTICS OF UNDISTURBED AND RECONSTITUTED SAMPLES OF VARIOUS MUDSTONES AND EFFECT OF SOIL IMPROVEMENT BY LIME

Abstract

 This paper reported swelling and slaking characteristics of mudstones subjected to infiltration of water as related to geotechnical disaster such as degradation of excavated rock surface and slope failure. In this study, one-dimensional swelling pressure and strain tests, and slaking tests were severally carried out on undisturbed mudstone specimens and their reconstituted specimen, in order to investigate the effect of lime treatment on suppression of swelling and slaking. The test results showed that the maximum swelling pressure correlated linearly with the maximum swelling strain on logarithmic scale, and that the dry condition is one of affecting factors in swelling and slaking properties. Also it was shown that the maximum swelling strain of reconstituted specimen reduced by addition of 5% dry weight ratio of lime to the specimen, and simultaneously the occurrence of slaking can be suppressed.