Method for measuring and calculating maximum dry density of natural debris
A technology of maximum dry density and gravel, which is applied in the direction of measuring devices, specific gravity measurement, instruments, etc., can solve the problems that are not conducive to the maximum dry density of natural gravel and are not applicable, so as to reduce the test work and human influence factors, and the distribution of compaction degree The effect of uniformity and dispersion reduction
Inactive Publication Date: 2014-03-05
CHANGAN UNIV
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[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 determi
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[0052] Example: Following the scheme of the present invention, the present invention will be described by taking the determination of the maximum dry density of natural gravel in a certain stockyard as an example.
[0053] (1) Estimated rock content in the stockyard or site
[0054] Take 4 representative groups of gravel from different parts of a stockyard, and screen each group of gravel with 5mm and 40mm sieves. The stone content of each group of gravel is 42%, 34%, 63%, 51%, respectively. Determine the stone content range of the sand and gravel of this stockyard as: 34%~63%, and get the estimated stone content range of 30~70% after this range is ±5%.
[0055] (2) Sample preparation
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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...
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Inventor 张长林田耀刚宋勇范亚明薛保贵赵铁李宏超经冠举李炜光
Owner CHANGAN UNIV
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