Study of consolidation grouting effect for downstream block of high arch dams

摘要

In this paper, the suitable grouting time and grouting pressure of downstream block of high arch dams for complicated foundations is studied. Deformations of downstream block of high arch dam in consolidation grouting stage are usually affected by grouting pressure, rock properties and seepage of the foundation. The consolidation grouting and lifting deformation mechanism are analyzed to propose the numerical feedback model. For complex foundations, Xiluodu Project is taken as an example to study the relationship between grouting pressure and the uplift deformation under the different construction period. Based on numerical results of the stress and deformation state, an optimal grouting arrangement was suggested, which avoids the cracking risk because of grouting uplift of block of downstream.