Revision of Additional Stress in Soils Based on Centrifuge Model Tests

To improve the accuracy of embankment settlement control of high-speed railway, centrifuge model tests with different loading methods were conducted to investigate the distribution of additional stress in two medium-compression soils under subgrade load. In addition, numerical computations with PLAXIS2D finite element program and field tests were performed to verify the experimental distribution of additional stress. On the test results, a modified calculation method for additional stress considering the effect of width-to-height ratio was proposed. The research results show that additional stress decreases more quickly near the foundation surface, but its attenuation is gradually decelerated with depth increasing. There exist a significant difference between the distribution of additional stress based on the Boussinesq solution and that acquired from the centrifuge model tests. Furthermore, the additional stress calculated by the modified method approaches the calculation result based on the field test data.