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Clay dispersibility testing device and clay dispersibility testing method

A technology of testing device and testing method, which is applied in the direction of measuring device, permeability/surface area analysis, suspension and porous material analysis, etc. It can solve the problem that the color of water flow is difficult to quantify, the pinhole cannot accurately reflect the actual situation, and the pinhole test The method process is cumbersome and other problems, and the effect of saving test time, high accuracy and simple operation is achieved

Inactive Publication Date: 2013-11-20
NORTHWEST A & F UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a device for testing the dispersibility of clay and a method for testing the dispersibility of clay using the device, so as to solve the complicated process of the existing pinhole test method, the difficulty in quantifying the color of water flow, and the measurement of pinholes. Technical issues that do not accurately reflect the actual situation

Method used

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  • Clay dispersibility testing device and clay dispersibility testing method
  • Clay dispersibility testing device and clay dispersibility testing method

Examples

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Embodiment 1

[0066] Embodiment 1 Clay dispersibility testing device

[0067] Such as figure 1 , 2 , 3, 4 and 5 are the clay dispersibility testing devices provided by the embodiments of the present invention. The device includes,

[0068] Fixed head water tank 1, which can control the water head with a hydraulic gradient of 2, 7, 15 and 40, and is used to provide different water heads;

[0069] The small cone 3 includes a cone part 30, the bottom surface of the cone part 30 is connected to a connecting column 32 with a diameter smaller than the diameter of the bottom surface of the cone; the connecting column 32 of the small cone is communicated with the water tank 1 with a water pipe; in this embodiment The bottom surface of the middle cone part 30 has a diameter of 10.2 mm and a length of 12.7 mm; a connecting column 32 has a length of 10.0 mm and a diameter of 8 mm; the axis of the small cone has a small cone through hole 2 with a diameter of 1.5 mm. As an option, the top of the con...

Embodiment 2

[0072] Embodiment 2 clay dispersibility test

[0073] The soil samples used in this example were collected from the Dashixia Hydropower Project in Aksu City, Xinjiang. The particle relative density of the soil sample is 2.71, the liquid limit is 28.6%, the plastic limit is 16.5%, and the plasticity index is 12.1. The particle composition is mainly silt (0.075-0.005mm) with a content of 62.3% and clay (<0.005mm) with a content of 19.0%. The soil samples belong to low liquid limit clay (CL).

[0074] Step 1, put the soil sample into the soil sample cylinder 5, and use the layered compaction method to compact the soil sample to make the test piece 4; make it reach the designed dry density of 1.68g / cm 3 And the moisture content is 13.3%, and the specimen size is Φ39.1mm×38.1mm.

[0075] Step 2, push the conical part 30 of the small cone 3 into the side of the test piece 4, and keep the axis of the small cone 3 coincident with the axis of the test piece 4, and make the gap betwe...

Embodiment 3

[0081] Embodiment 3 clay dispersibility test

[0082] The soil samples used in this example were collected from the water diversion channel project of Xinjiang Akedala Hydropower Station. The particle relative density of the soil sample is 2.72, the liquid limit is 29.2%, the plastic limit is 19.0%, and the plasticity index is 10.2. The particle composition is mainly silt (0.075-0.005mm) with a content of 76.4% and clay (<0.005mm) with a content of 23.0%. The soil samples belong to low liquid limit clay (CL).

[0083] Step 1, put the soil sample into the soil sample cylinder 5, and use the static pressure method to compact the soil sample to make the test piece 4; make it reach the designed dry density of 1.72g / cm 3 And the moisture content is 17.2%, and the specimen size is Φ39.1mm×38.1mm.

[0084] Step 2, push the conical part 30 of the small cone 3 into the side of the test piece 4, and keep the axis of the small cone 3 coincident with the axis of the test piece 4, and m...

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Abstract

The invention discloses a clay dispersibility testing device. The clay dispersibility testing device comprises a fixed water head water tank, a small cone and a soil sample tube, wherein a connecting column of the small cone is communicated with the water tank through a water pipe, the soil sample tube is formed by 2-5 tube sections which are fixed to form a cylinder through a tube hoop. The invention further discloses a clay dispersibility testing method. The clay dispersibility testing method comprises the following steps of: step 1. preparing a test specimen; step 2. pushing the cone part of the small cone into one side of the test specimen, keeping the superposition of the axis of the small cone and the axis of the test specimen; step 3. forming a test specimen through hole; step 4. painting a cementing material on the other side of the test specimen so as to form a protection layer; and step 5. performing a seepage test, and determining the diameter of the test specimen through hole. The device and the method have the beneficial effects that since the detachable soil sample tube is adopted, after the test is finished, the tube hoop is detached, the soil sample tube is easily opened, the test specimen is completely taken out, and the diameter of the test specimen through hole is accurately determined. In addition, the protection layer can prevent a free face of the test specimen from being eroded by water flow during the testing process.

Description

technical field [0001] The invention relates to the technical field of civil engineering testing, in particular to a clay dispersibility testing device and a clay dispersibility testing method using the device. Background technique [0002] Since the dispersed soil has the characteristic of dispersing and losing when it encounters water, it is very harmful to water conservancy projects, road projects and agricultural water and soil projects. Water-retaining structures built with dispersed soil are vulnerable to damage, such as Yinnen Project in Heilongjiang Province and Lingluo Reservoir in Hainan Province. At present, there are five test methods for judging the dispersibility of clay, including pinhole test, fragment test, double hydrometer test, exchangeable sodium ion percentage test and pore water soluble cation test. [0003] The pinhole test is to drill an axial pore with a diameter of 1.0mm in the center of a cylindrical specimen, and then use distilled water or wate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
Inventor 樊恒辉陈华王中妮许淼路立娜刘世皎赵高文
Owner NORTHWEST A & F UNIV
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