拱坝沿建基面上滑稳定一直是坝工界比较关注的问题.结合奥地利科恩布莱茵拱坝工程实例,用拱梁分载法对拱坝上滑稳定进行理论分析,利用三维有限元分析软件ABAQUS CAE进行拱坝沿建基面上滑稳定分析.对比分析了开裂前和开裂后在正常蓄水位荷载作用下建基面上剪力的变化情况以及拱坝X、Y、Z三个方向的位移.两种方法的分析结果都表明,坝体裂缝削弱了拱坝中梁的作用,使得梁承担的荷载减小、拱承担的荷载增加,导致梁和拱的变形都相应地增大,建基面上剪力的合力减小,拱坝的整体位移表现出坝体有被上抬的趋势.因此坝体开裂后增加了拱坝沿建基面上滑的危险性.%The problem of stability against sliding along contact face of arch dam has been concerned closely.In this paper, combining the engineering example of K(o)lnbrein arch dam 200 m high in Austria, the theory analysis of up-sliding stability of arch dam had been carried out by using the trial load method of arch dam, and the three dimensional finite element analysis of stability against sliding contact face of arch dam also had been done by using finite element analysis software ABAQUS CAE.Under the load of normal high water level, changes of the shear of contact face of arch dam and X, Y, Z three directions displacement of arch dam body had been analyzed before and after dam cracking.The studied results of two methods showed that risk of up-sliding along contact face of arch dam had been increased after arch dam cracking.Dam cracks weakened the effect of beam, which decreased the bearing load of beam and increased the bearing load of arch, which leaded to deformation of beam and arch were increased and the shear force of contact face of arch dam were reduced, the integral displacement of arch dam showed that the dam body had been rising trend.
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