Method for measuring and calculating maximum dry density of natural debris

Abstract

The invention discloses a method for measuring and calculating maximum dry density of natural debris. The method specifically comprises the following steps: estimating stone mass percent of a stock ground or a site; performing a screening test on a debris sample through a water pressure sieving method to obtain the over-size particle content p and stone content; screening a reserved sample from particles with the particle size of 40-60mm in the debris for later use; screening the particles with the particle size of less than 40mm into two kinds of particles with the particle size of 5mm below or 5-40mm; performing a compaction test; determining a relationship between the stone content and the maximum dry density; taking the reserved sample of the particles with the particle size of 40-60mm, and calculating to obtain the bulk volume relative density of the over-size particles; substituting the stone content of the debris sample into a regression formula, and calculating to obtain the maximum dry density of the debris sample with the particle size of less than 40mm; calculating the corrected maximum dry density. Aiming at the characteristic that the natural debris serving as roadbed filling is good in performance and poor in gradation, the relationship between the particle size of the particles and the maximum dry density is analyzed, the maximum dry density of the natural debris is scientifically and comprehensively determined, the method is scientific, simple, convenient and rapid, and the test result is accurate and reliable.

Description

technical field [0001] The invention can be applied to the field of highway engineering, and in particular relates to a method for measuring and calculating the maximum dry density of natural gravel. Background technique [0002] Due to its engineering characteristics such as easy compaction and large bearing capacity, natural gravel has become an excellent road construction material, and is widely used in highway construction, such as soft foundation treatment and backfilling of abutments. However, the material of natural sand and gravel is uneven, including differences in gradation, particle size and moisture content. The construction site generally requires that the same road section should be sourced from the same stockyard as much as possible. ) for the maximum particle size of roadbed filler: the roadbed shall not exceed 100mm, and the embankment shall not exceed 150mm. Thus, in order to ensure the compaction quality of the gravel subgrade, the determination and appli...

AI Technical Summary

Problems solved by technology

[0013] In summary, the above-mentioned ordinary heavy compaction method, surface vibration compactor method, shaking table method and static compaction method are not conducive to accurately and effectively determining the maximum dry density of natural gravel, and are not suitable for construction sites Compaction control, especially for cohesive gravels that do not drain freely, none of the above four methods are suitable

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