三峡工程升船机及临时船闸边坡稳定性计算分析

 升船机和临时船闸的基础岩体地质条件较为复杂。在对地质和设计条件作出合理概化的基础上，采用三维弹塑性有限元计算法，分析了开挖过程中岩体的变形与应力状态，探讨了升船机和临时船闸区段中升船机北坡、上闸首、中隔墩及临时船闸南坡等各个关键部位的岩体稳定性。有限元数值分析结果表明，各个部位在开挖过程中均有1～2.54 cm的卸荷回弹，最大变形为2.54 cm，发生在升船机北坡。在高程较低的部位如两侧边坡的直立墙底部出现了明显的应力集中现象，压应力值最大可达17 MPa。在上闸首与上游引航道相连接的部位及中隔墩的顶板部位出现了拉应力区，前者的最大拉应力值为0.58 MPa，后者的最大拉应力值为1.01 MPa。

Analysis of stabilities of ship lift and temporary lock of Three Georges Project by using elastico-plastic FEM

The ship lift and temporary lock are all the navigation constructions of the Three Georges Project,while the geological conditions of their rock foundation are rather complicated.Based on the rationalized generalization on geological and design conditions,this paper analyzes the deformation and stress of rock mass by using elastico-plastic FEM.It also discusses the stabilities of rock mass in some key parts,such as the northern slope of lift,upstream lock head,and middle division pier as well as the southern slope of temporary lock.