Research on stress and deformation properties of high concrete-faced rockfill dam with narrow valley and deep overburden foundation

In order to research the stress and deformation properties of high concrete-faced rockfill dam under the conditions of narrow valley and deep overburden layer foundation,this article applied the mid-point increment method and took Jiudianxia high rockfill dam as an example to analyse stress and deformation of 3-D finite element numerical simulation in construction period and operation period,which are based on Duncan-Chang E-B non-linear constitutive model.The results showed that compared with the rockfill dam under the conditions of wide and shallow valley in the completion period and the storage period,the distribution of horizontal displacement of the high rockfill under the the conditions of narrow valley and deep overburden layer foundation is more greater influenced by cover,the stress distribution of dam also appears to have different distribution characteristics,stress and deformation of the panel in the normal range.However,in storage period,panel joints,especially the displacement of peripheral joint is more larger.Therefore,we suggest that we should take appropriate protective measures to respond to joint sealing.