Grain composition testing method of over-coarse-grained soil

Abstract

The invention discloses a grain composition testing method of over-coarse-grained soil. The problems of grain size testing of a traditional soil body are solved, and the problem is solved that debrisgranularity and grain composition of the over-coarse-grained soil and a coarse-particle-containing soil body are difficult to accurately grasp. The method includes the following steps of measuring themass proportions of all soil fractions of soil grains with the equivalent grain size being larger than D through a linear density method, calculating the total mass proportion of all the soil fractions of the soil grains with the equivalent grain size being larger than D, calculating the total mass of the soil in combination with the weighed weight of the soil grains with the equivalent grain size being smaller than or equal to D of an indoor sample, obtaining the mass of all the soil fractions of the soil grains with the equivalent grain size being smaller than or equal to D through an indoor sieving method, calculating the mass ratio of all the soil fractions of the soil grains with the equivalent grain size being smaller than or equal to D, and drawing a composition curve through the result. The method has the advantage of meeting the requirement for precisely analyzing the grain size and components of the over-coarse-grained soil and other soil bodies with large-grained particles.

Description

technical field [0001] The invention relates to the technical field of soil particle gradation analysis, in particular to a particle gradation test method for giant-grained soil. Background technique [0002] The size of the particle is called "particle size", also known as "particle size" or "diameter", its definition: when a certain physical property of the measured particle or a homogeneous sphere (or combination) of a certain diameter is the closest The diameter (or combination) of the sphere is taken as the particle diameter (equivalent particle diameter) of the particle to be measured. [0003] The measurement of particle size is essentially obtained by comparing the measured particles with a sphere made of the same material. Instruments with different principles choose different physical properties or physical behaviors as references for comparison. For example, the sedimentation meter chooses the sedimentation velocity , the laser particle size analyzer chooses the ...

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Problems solved by technology

[0005] Giant-grained soil refers to the soil whose particle size is greater than 60mm and the mass of the giant-grained soil is more than 15% of the total mass. ) Stones such as rice-scale and sub-meter-scale particles, it is difficult to accurately grasp the particle size distribution and content of the coarse-grained group of this kind of deposits by conventional indoor particle analysis methods

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