关键词: 纤维加筋土, 抗压强度, 应力-应变, 盐渍土

Abstract: The engineering problems of saline soil in inshore, including expansion, dissolution and water absorption, which result in the decrease of the compressive property are studied, Unconfined compressive test on fiber-saline soil is carried out in the conditions of three water contents (13%, 15% and 17%), three dry densities (1.77, 1.80 and 1.84 g/cm3), five fiber lengths (6, 12, 19, 25 and 31 mm) and five fiber contents (0.1%, 0.15%, 0.2%, 0.25% and 0.3%). The results show that the compressive strength fiber-saline soil decreases with increasing water content and increases with increasing dry density, but firstly it increases, and then decreases with increasing fiber length and fiber content at the limited point of fiber length 19 mm and fiber content 0.2%. All stress-strain curves are strain softening; the water content is a major influencing factor. By means of the nonlinear multivariate stepwise regression method, the sequence of adverse effect on the compressive property is water content, dry density, fiber content and fiber length respectively. It has been proved that reinforcing fiber can contribute to enhance the compressive property of saline soil significantly.

Key words: fiber-saline soil, compressive strength, stress-strain, saline soil