Dumping rocky soils from a great height in the periodic flow technology of constructing earth-rock dams: Fid-Bau Portal

Dumping rocky soils from a great height in the periodic flow technology of constructing earth-rock dams

Lushnov, N. P.

Conclusions 1.The degree of crushability of coarse-fragmental soil when dumped from a great height is determined, other conditions being equal, by the strength of the rock and grain size of individual fractions. Coarse-grained fractions have greater crushability and fine-grained considerably less. The crushability of coarse-grained fractions in the case of their negligible content in mixtures of coarse-fragmental soil of a multiple-fraction composition does not have a substantial effect on a change in the granulometric composition and placement density of mixtures in mounds. 2.The compactability of corase-fragmental soil with dumping from a great height is less than the values obtained on compacting the same material by heavy vibrating rollers with placement in layers 1 m thick. The average values of the density of mounds formed on placing and compacting gravelpebble soil by dumping from a height are within 2.1–2.2 tons/m3. 3.An increase of the dumping height from 20 to 60 m (and more) does not have a substantial effect on the density of the mounds formed, since for a given granulometric composition an negligible crushability of grains of the mixtures dumping does not provide the formation of dense structures of the arrangement of the grains in a given volume compared with industrial compaction methods. In the best case the increase of density for the densest structures reaches 15–20% compared with the loose state of the material. 4.Dumping of coarse-fragmental material from a height as the final stage of periodic flow technology can be used when placing the shoulders of certain earth-rock dams instead of cyclic leveling by bulldozers and compacting by pneumatic-tire or vibrating rollers when technically and economically feasible.