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Method for testing maximum dry density of super grain size rough granule soil

A technology of ultra-sized particles and maximum dry density, which is applied in the direction of measuring devices, specific gravity measurement, instruments, etc., can solve the problem that it is difficult to determine the size of the gap between ultra-sized particles and non-ultra-sized particles, and prevent fine particles with super-sized particles Soil maximum dry density correction and other issues, to achieve the effect of simple model, simple calculation and reasonable calculation results

Inactive Publication Date: 2012-07-11
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

[0012] It can be seen that a similar method can be used to determine the maximum dry density of coarse-grained soils with super-sized particles; however, it is difficult to determine the size of the gap between super-sized particles and non-super-sized particles This method performs a maximum dry density correction for fine-grained soils with oversized grains

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  • Method for testing maximum dry density of super grain size rough granule soil
  • Method for testing maximum dry density of super grain size rough granule soil
  • Method for testing maximum dry density of super grain size rough granule soil

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Embodiment

[0044] A kind of embodiment of the present invention is, a kind of assay method of the maximum dry density of super-particle size coarse-grained soil, its steps are successively:

[0045] 1, a kind of mensuration method of the maximum dry density of super particle size coarse-grained soil, its steps are successively:

[0046] (1) Particle size grouping

[0047] Particles are grouped by the sieving test, and the particles are sieved step by step, and the particles on each stage of the sieve are grouped; the ratio of the aperture of each stage of sieve to the aperture of the adjacent next stage of sieve is 1: 0.5 ~ 0.7, the most The aperture of the next stage sieve is 0.075mm;

[0048] The primary sieve whose pore size is smaller than and closest to the maximum particle size allowed by the maximum dry density measuring equipment is used as the boundary sieve, the particles on the boundary sieve and above all levels of sieves are super-sized particles, and the particles on the r...

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Abstract

The invention discloses a method for testing a maximum dry density of super grain size rough granule soil. The method comprises the following steps of: grouping granule grain sizes of a test sample at first; calculating representative grain sizes of a super grain size granule group and a non-super grain size granule group according to a mass weighing averaging method; determining a ratio of a volume of a gap between the super grain size granule and the non-super grain size granule to a volume of a super grain size granule entity, namely a super grain size granule porosity ratio, according to an established planar analysis model stacked by spheres having two grain sizes and an introduced space correction coefficient; according to a gross volume density of the super grain size granule, the mass percentage of the super grain size granule and the maximum dry density of the test sample free of the super grain size granule, the maximum dry density of the super grain size rough granule soil can be obtained. The method is definite in theory and easy in operation; the tested maximum dry density is more accurate; and more reliable data basis can be provided for engineering construction.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, in particular to the technical field of density measurement of coarse granular soil. Background technique [0002] Coarse-grained soil is widely distributed in nature, has abundant reserves, and has excellent engineering characteristics such as good compaction performance, high shear strength, small compression deformation, strong water permeability, and is not easy to liquefy under seismic loads, so it has been obtained in engineering construction. widely used. Such as sand and gravel cushions for railway and highway subgrades, earth-rock dams, artificial islands and soft foundation treatment. Some of the filling standards for this type of soil use the degree of compaction, and some use the relative density, even if the density of the soil after filling must meet the requirements of a certain degree of compaction or a certain relative density adopted in the design. No matter w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N9/36
Inventor 罗强陈坚张良肖双松王冠陈虎刘钢李浩万小全陶元洪
Owner SOUTHWEST JIAOTONG UNIV
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