关键词: 盐渍土, 冻结, 应力-应变关系, 抗压强度, 相对温度

Abstract: According to results of the triaxial compressive test of saturated saline frozen silty clay, the stress-strain relationships are studied in the process from the beginning of test to the soil samples destroyed. And maximum values of initial elastic modulus and principal deviator stress are calculated by using Duncan-Chang hyperbolic model. The results show that the values of initial elastic modulus and principal deviator stress increase with salinity reducing and temperature falling. In order to analyze the action mechanism of salt content affecting on soil strength, a new concept, the relative temperature, is put forward, and the linear relationship of the relative temperature and the compressive strength are described. The relative temperature is an integrative conception to take into account how some elements, i. e. salinity, test temperature, etc, affect frozen soil characteristics, so as to express the relationship of saline soil and non-saline soil by the relative temperature. And the mechanical characteristics of saline soil is studied by it of non-saline soil.

Key words: saline soil, silty clay, stress-strain relationship, compressive strength, relative temperature