Abstract
The article deals with deformations of channel beds in of various-grained, non-cohesive, rather coarse-grained soils having more than 0.55 mm mean diameter of particles that might form natural pavement at velocities slightly higher than non-erosive ones. Laboratory experiments prove that as soon as natural pavement has formed, modelled bed deforms only a little. Is proposed scheme of calculation of parameters of the channel and the channels deformation. The bed should be erosion normally of the slopes. To estimate the time of deformation is proposed to use for the flow of the bottom sediments of probabilistic formulas, based on a model of K. I. Rossinskii. To determine the diameter of armoring and depth of erosion of the riverbed of the proposed new method of calculation that gives the values close and experienced and method of A.V. Magomedova. Is given block diagram of the calculation riverbed in a non-uniform particle size. Channels sizes you can define by setting a slight excess permissible velocities, or you can take specified values. There is good agreement between the values of erosion obtained in the experiments and in the calculations. In the presence of the surface layer of the slope or the ballast layer of geotextile of various-grained of a certain thickness may be formed armoring, capable of protecting the slopes of the channel from erosion.
Highlights
Construction of soil channels without concrete reinforcement keeps is still appropriate because of its economic attractiveness
Defining the maximum depth of a channel according to the formulas for a parabolic channel, you go to the average depth, the width of the top
The composition of the natural pavement that forms at the surface of the soil depends on the depth of wash-out, i.e. the depth of soil conversion layer
Summary
Construction of soil channels without concrete reinforcement keeps is still appropriate because of its economic attractiveness. High velocities possible in concrete bed are not required in most cases, as the surface has a slight slope. Initial data for hydraulic calculation of the channel in a non-cohesive soil by method of permissible speed are: a design discharge, a curve of soil granulometry and its weighted mean diameter, a coefficient of roughness. The calculation begins with allocating or finding the maximum depth. Defining the maximum depth of a channel according to the formulas for a parabolic channel, you go to the average depth, the width of the top
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