Abstract:Centrifugal model tests and numerical simulation are carried out to study the excavation effect of high soil-like slope. The excavation effect is worth being noted when multistage slopes and flats are required. Undisturbed soil mass,which is taken from a completely weathered slope along Zhangzhou—Longyan Expressway in Fujian Province,is adopted in centrifugal model tests. Ubiquitous joints plasticity units are used to establish the slope model in numerical simulation with fast Lagrangian analysis of continua. The modeling processes corresponding to the centrifugal model test and numerical simulation respectively are recommended in detail. The test approaches and measuring instruments are also put forward. The conclusions drawn from above two methods show that the excavation of each slope-stage will bring additive displacement and unbalance force on other slope stages. The additive displacement and unbalance force will threaten the stability of the excavated slope stages,even the whole slope and the supporting engineering. Sometimes the additive unbalance force will be over twice of the originally residual amount. So the excavation effect should be adequately considered in the slope design. And the bearing capacity of the support engineering should fit the excavation effect of the multistage slopes. At last,the observed original data of the displacements and horizontal thrusts of the designated points in each slope-step from the centrifugal model test are listed. And the points are clearly marked in the illustration of model prescribed. From the centrifugal model test and numerical simulation,the horizontal thrust and unbalance forces curves of each designated point are drawn during excavation.