中文摘要：

不同施工时序对边坡稳定性有较大影响，应用离心模型试验和数值计算研究和分析不同施工时序对边坡变形破坏和应力场的影响。结果表明，开挖后及时支护程度越高，不但能减少边坡变形量，而且有利于边坡的稳定（试验中两级边坡开挖，及时支护比开挖完成后进行一次支护的最后破坏加速度提高14．15％；上级开挖后进行及时支护，向下级开挖后未进行及时支护，其最后破坏加速度比一次性支护提高8．49％）。及时支护程度越高，越有利于边坡稳定的作用机制，也可有效改善边坡坡面剪应力集中程度和最大剪应力的连通情况，并限制应力松弛程度；边坡上体的应力路径（应力历史）更加有利于边坡的稳定。另外，对于特别高大的边坡多级开挖，建议对上级开挖边坡进行临时支护，在开挖完成后再进行永久支护，这样既能发挥边坡的“新奥法”原理，又能避免因下级开挖应力调整而导致上级支护结构受力过大而失稳的影响，且支护成本可降低，该结论对于工程实践育一定的指导意义。

英文摘要：

Different excavations and support sequences have a great effect on the stability of slope. Based on centrifuge model tests and numerical calculation, the deformation failure and stress field due to different excavation and support sequences, are analyzed. The results show that the prompt support after being cut can reduce the deformation magnitude of slope and can improve the stability of slope（the centrifuge model tests of soil slope with two cut stages show that prompt support after being cut, the failure acceleration is 14.15 % higher than once support after the whole being cut; the up stage with prompt support, but down part without prompt support is 8.49% higher than that of once support after the whole being cut）. The mechanism of prompt support with high stability is that the concentration degree and connection of the maximum shear stress are weak, but the stress loose degrees are low. At last, those very high slopes cut with multilevel stages should be supported temporarily to uphold stages first, and then to hold permanent support after the whole slope being cut. Thus, it meets sufficiently the ＂New Austrian＂ principle and satisfy the requirements of slope stability with a lower cost. The results have practical significance for engineering practice.