EXPERIMENTAL STUDY ON THE COEFFICIENT K0 FOR Q3 LOESS UNDER ISOTROPIC STRESSES

Through the graded water immersion test of undisturbed loess under vertical pressure, the variation law of static earth pressure coefficient during humidification was studied, and the following conclusions were drawn: (1) The static earth pressure coefficient of undisturbed loess increases linearly with the increase of humidification level. The rate of increase depends on the vertical pressure. The higher the vertical pressure is, the slower the increase rate is. (2) During the humidification process, K0 increases linearly with the decrease of suction force, and the higher the vertical pressure, the slower the rate of increase of K0. (3) The vertical strain and the static earth pressure coefficient K0 test points in the humidification process under different vertical pressures are distributed in a narrow range, which can be described by hyperbola, and the difference between the different pressure action and the water immersion sequence is different. small. The static earth pressure coefficient of undisturbed loess is determined by vertical strain.