Find in Library

The coefficient of earth pressure at rest <i>K</i>₀ is a state soil variable correlated with relative density <i>D</i>_r. As previously conducted <i>K</i>₀ tests could not guarantee zero lateral deformation in the sand specimens, significant errors occurred in the test results. In this paper, a centrifugal model test method is used to study the <i>K</i>₀ of sand with varying densities. The sand specimens with varying relative densities are prepared by sand pluviation, and a 50 g-ton centrifugal force is applied. Subsequently, the relationship of <i>K</i>₀ and <i>D</i>_r with different densities is analyzed. The test results show that for the same type of sand, the value of <i>K</i>₀ gradually increased with <i>D</i>_r. Based on the meso-evolution characteristics of sand particle recombination, various relationships between <i>K</i>₀, the displacement deflection angle, and the friction offset angle between particles are analyzed. Furthermore, the relationship between particle volume fraction and <i>K</i>₀ is derived, the assumption of increasing the coefficient <i>K</i>₀ with the increase in <i>D</i>_r is verified, and the effect of <i>D</i>_r of sand on the force transfer behavior of the internal particle fabric is briefly discussed. The research results could significantly improve the current earth pressure theories.