Grading design method of skeleton dense structure for grading macadam base

Abstract

The invention discloses a grading design method of a skeleton dense structure for a grading macadam base. The method comprises: using a dynamically controlled classification criteria for coarse and fine aggregates proposed by a Bailey method to classify particle sizes of the coarse and fine aggregates, with the coarse aggregates being used as skeletons and the fine aggregates being used as filling materials; using a graded embedding method to design the coarse aggregates, determining a coarse aggregate proportion by using a California bearing ratio and a frame gap rate as design specifications; and calculating an amount of the fine aggregates according to a coarse aggregate skeleton gap under the proportion of the coarse aggregate after the coarse aggregate skeleton part is designed, wherein a calculation method can refer to a calculation method of the fine aggregates in the Bailey method, and in order to ensure adequate filling, a tight-packing density is selected as a design density for the density of the fine aggregates. The graded gravel design method provided by the invention can meet engineering requirements, and is operable and relatively perfect, so that the graded gravels are guaranteed to have relatively good mechanical properties and endurance, thereby not only providing technical supports for application of the graded gravels, but also providing references for improvements of relevant norms.

Description

technical field [0001] The invention belongs to the technical field of pavement graded crushed stone bases, and relates to a method for designing the gradation of a dense skeleton structure for a graded crushed stone base, and in particular to a method for designing the gradation of a dense skeleton structure for a graded crushed stone base. Background technique [0002] Since the graded crushed stone does not contain any cementing material, the source of its strength is only the intercalation between the crushed stone particles and the strength of the crushed stone itself. In order to improve the strength of graded crushed stone, we can only start with the strength of the crushed stone itself and the strength of the embedded squeeze between the crushed stones. For the strength of the crushed stone itself, it is mainly related to the quality of raw materials. Therefore, on the basis that the raw materials meet the requirements of the specification, we should start from the ...

AI Technical Summary

Problems solved by technology

[0005] In view of the superiority of the skeleton-dense gradation, the graded gravel in engineering applications often adopts a skeleton-dense structure, but the range of graded gravel recommended in the "Technical Specifications for Construction of Highway Pavement Base" (JTJ034-2000) is still a continuous dense gradation, that is, The formed structure is a suspended dense structure, and the recommended range is relatively wide

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