Seismic response analysis of small-particle weathered rockfill dams

small-grained regolith;  concrete face rockfill dams;  Field trials;  indoor testing;  Seismic response analysis

In order to verify whether the small-particle size breeze fossil material with poor particle gradation in the excavation area of the landslide body in the reservoir area can be used as the filler of the main rockfill area of the concrete panel rockfill dam body in the large water gou reservoir, the on-site compaction test of this kind of stone was carried out. Corresponding to the maximum compactness that can be achieved in the field test, the denaturation modulus Es, Poisson’s ratio v, permeability coefficient K and triaxial fast shear mechanical parameters c of such stones in this state were obtained through indoor test ψ, and the dynamic response analysis of the dam under the condition of magnitude 7 seismic intensity was carried out by the one-dimensional shear layer method according to the indoor and outdoor test parameters, and the maximum dynamic shear strain and shear stress reaction distribution of the dam were obtained, and the absolute maximum dynamic shear strain in the dam body was 4.41×10-3. The absolute maximum dynamic shear stress is 40kPa, which is much less than the strength of the dam itself, which verifies that this kind of stone can be used as the filler of panel rockfill dams, and broadens the selection range of filling materials for concrete facet rockfill dams.