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Method for measuring filtration coefficient of oversized-grain-diameter coarse-grained soil

A technology of permeability coefficient and measurement method, which is applied in the field of parameter measurement of hydraulic engineering materials, and can solve the problems of difficult exhaust saturation of samples and large sample size.

Inactive Publication Date: 2013-07-24
超飞凡科技(天津)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because very few super-large-sized coarse-grained soils have been used in water conservancy projects, and when using this type of soil materials in water conservancy projects, it is necessary to mix more small particles of cohesive soil, and the sample size is relatively large, so it is very difficult to obtain samples. Gas saturation is performed, so there are no instruments and mature test methods for permeability performance testing of super-large-grained coarse-grained soils

Method used

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  • Method for measuring filtration coefficient of oversized-grain-diameter coarse-grained soil
  • Method for measuring filtration coefficient of oversized-grain-diameter coarse-grained soil
  • Method for measuring filtration coefficient of oversized-grain-diameter coarse-grained soil

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Embodiment Construction

[0068] Such as Figure 1-Figure 3 As shown, the test device used in the assay method of the present invention includes a test cylinder, an automatic pressurization system 11 and a pressure measuring tube 12. Composition, wherein, the buffer material container 2 is supported on the upper part of the base bracket 1, the side wall of the buffer material container 2 is provided with a lower exhaust hole 3, and the lower part is provided with a lower water inlet 4; the upper part of the buffer material container 2 is connected to the The cylinder body 6 is connected by sealing bolts 5, and a plurality of cylinder wall pressure measurement and exhaust holes 7 are arranged on the cylinder body 6, and each of the cylinder wall pressure measurement and exhaust holes 7 is provided with a valve; the cylinder body 6. The upper part is connected with the upper cover 8 through sealing bolts 5, and the upper end of the upper cover 8 is provided with an upper water outlet 9 and an upper exhau...

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Abstract

The invention relates to a parameter measuring method of a water conservancy engineering material, and particularly relates to a method for measuring a filtration coefficient of oversized-grain-diameter coarse-grained soil (the grain diameter d85 of which is more than or equal to 60mm and is less than or equal to 100 mm), and the IPC international patent classification is E02D1 / 04 and E02D33 / 00. The method provided by the invention adopts a specialized measuring device which comprises a testing tank, an automatic compression system 11 and a pressure measuring tube 12, wherein the wall of the testing tank is provided with multiple pressure measuring holes, the pressure measuring holes in the tank wall are utilized as vent holes in soil body exhaust saturation and can cooperate with vent holes in the tank top and the tank bottom to accelerate ventilation, and thus a sample rapidly achieves a saturation condition. A large number of tests prove that the measuring method provided by the invention has the advantages that hot water at 25-40 DEG C is utilized to saturate the oversized grain diameter sample rapidly, and the influence to chemical and physical stability of the sample is smallest.

Description

Technical field: [0001] The invention relates to a method for measuring parameters of water conservancy engineering materials, in particular to a method for measuring coarse-grained soil materials with super large particle size (particle size 60mm≤d) selected in engineering 85 ≤100mm) for the determination of permeability characteristics, its IPC international patent classification numbers are E02D1 / 04 and E02D33 / 00. Background technique: [0002] In the construction of water conservancy, transportation, railway and other projects, coarse-grained soil is often used as the basic material. Coarse-grained soil According to the "Soil Classification Standard" (GBJ145-90), coarse-grained soil refers to particles with a particle size greater than 0.075mm and less than 60mm. [0003] In water conservancy projects, coarse-grained soil is often used as dam foundation and embankment foundation materials; in railway and highway projects, it is often used as roadbed materials. For thes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
Inventor 付玉生傅酉
Owner 超飞凡科技(天津)有限公司
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