某水电站右岸软弱岩带对坝肩稳定影响的FLAC^(3D)分析

Analysis on influence of weak fractured zones on deformation and stability of a right dam-abutment by FLAC^(3D)

某水电站右岸软弱岩带发育,坝基岩体质量较差。采用FLAC3D分析表明,在大坝荷载或大坝+库水荷载作用下,右坝基(肩)变形总量及其与左坝肩变形差异均较小,右坝肩变形随时步衰减较快。结合坝基地质条件分析,右岸软弱岩带不会导致坝肩变形失稳。

There are many weak fractured zones and net-cracks inside a right dam-abutment at a hydoelectrical power station. In order to evaluate their influences to deformation and stability of the right damabutment, the method of FLAC3D （Vision 2.0） study is carried out on the basis of analysis on the geological conditions. It is shown that total deformation of the right dam-abutment is small, and the differential deformation between two dam-abutments is also small. The deformation of the right dam-abutment decreases rapidly as time-step under rock-fill dam load or dam and reservoir load. There is no obvious influence of the weak fractured zones on deformation and stability of a right dam-abutment.