The feedback of rheological deformation of concrete face rockfill dam based on engineering analogy method

Abstract

In view of relationship for axial strain, volumetric strain and the generalized shear strain are different in different documents when the rheology deformation of rockfill dam is analyzed. Volume rheology and shear rheology are assumed different, three-dimensional rheology rate of rockfill material is deduced and the reasonable relationship for axial strain, volumetric strain and the generalized shear strain is also deduced. Since the difference between indoor test parameters and rockfill dams actual parameters is bigger, the measured deformation for the rockfill dam to be built cant timely obtain and the rockfill dams actual parameters also cant timely feedack. The engineering analogical method is presented for the feedback of rockfill dams actual parameters. The measued deformation for already built rockfill dam, with similar dam height, upstream and downstream slope rate, valley shape factor and rock behaviour of rockfill material, is selected, and the parameters for rockfill dam to be built is feedback with the rheological numerical calculation. Example analysis shows that, analogy the measured deformation for the already built rockfill dam, the specific value between actual modulus factor of rockfill dam to be built and indoor test modulus factor is about 0.7; the specific value between the largest settlement and the dam height is 0.667%-0.720% when considering rheological deformation; the specific value between concrete faces deflection and the largest settlement is 0.252-0.272, and the incremental settlement of dam crest increses when the rheological parameter c decreases, but the value is small, the incremental settlement of dam crest is 3.537 cm after running 3 years.