Impact of Uplifting on Behavior of High Concrete Dams
Investigations carried by the Geodynamic Research Center at such dams as the 270 m high Inguri arch dam (Georgia), the 245 m high Sayano-Shushenskaya arch-gravity dam (Russia) and 110 m high Capanda gravity dam (Angola) show that after impoundment of the reservoir and in seasonal fluctuations of its water stages there takes place uplifting of the shore rock masses, vertical tensioning of the dam body accompanied by cracking and opening of the construction joints at the upstream face, development of new seepage paths and increases in the seepage flows. At the same time there occurs de-stressing of the rock mass due to opening of the joints and drop in its shear strength due to uplift of the vertical stresses in the rock mass which has been confirmed by geophysical explorations which were conducted in filling the Inguri and Sayano- Shushenskaya reservoirs. Sharp changes of the seepage pattern in the foundation lead to jump-like head variations, breakthrough of the plugged holes, development of new seepage paths, seepage flow increases. These impacts are most distinctly displayed at high reservoir levels when horizontal loads tend to rise significantly in the dam abutments, which entail decrease in safety of the whole dam- foundation system.
Savich A.I. Gaziev E.G.
Geodynamic Research Center, Moscow
国际会议
香港
英文
1-4
2009-05-19（万方平台首次上网日期，不代表论文的发表时间）