Abstract: Two types of over-consolidated ratioes are defined. Undisturbed and remolded saturated loess are tested by undrained shearing test under different confining pressures and over-consolidated ratios. On the base of the definition of stress sharing ratios, the relationship between stress sharing ratio and strain level is obtained from test results, which behaves as two phases. Structure releasing coefficient is defined and it is used to analyze the stress sharing ratio curve. The results show that, under two types over-consolidated ratios, the structure releasing coefficient’s regulation of samples with the same pressure but different over-consolidated ratios is unanimous; under different pressures and two types over-consolidated ratios, the coefficient has the same characteristic. On the base of that, a model and the corresponding formulation are put forward to describe the structure’s regulation. The formulation is a three phases fuction which has a simple form with only two parameters. The comparative analysis indicates that the calculation results have a good consistency with the tests

Key words: structure, stress sharing ratio, over-consolidated ratio, structure release coefficient, strain threshold value