Unsaturated soil matrix suction filter paper method measurement device and method

A technology of matrix suction and filter paper method, applied in the field of unsaturated soil research, can solve the problems of difficult to achieve complete sealing, inconvenient operation, inaccurate measurement, etc. The effect of precision

Inactive Publication Date: 2017-06-30
CHANGAN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

At present, this method is briefly described in ASTMD5298-10. The device used is to use a sealed tank to create a sealed condition. The weighing filter paper is placed in an aluminum box or a fresh-keeping bag. It is difficult to achieve a completely sealed effect and it is inconvenient to operate. Weighing the filter paper using an aluminum box or a fresh-keeping bag will cause inaccurate measurement due to the large base number

Method used

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  • Unsaturated soil matrix suction filter paper method measurement device and method
  • Unsaturated soil matrix suction filter paper method measurement device and method
  • Unsaturated soil matrix suction filter paper method measurement device and method

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specific Embodiment

[0035] Test preparation:

[0036] Filter paper: After washing the desiccator and the aluminum box with distilled water, the desiccator is naturally air-dried, and the aluminum box is dried in a drying oven. The tester puts on sterile medical gloves, puts Whatman No.42 filter paper into an aluminum box, and places it in a blast drying oven at 105°C for more than 8 hours. If an oven is used, the temperature should be controlled at 30-40°C. Cool and dry in a prepared desiccator. The desiccator should be kept clean and desiccant should be placed in advance.

[0037] Soil sample: Put the soil sample with a ring knife (6.18cm in diameter) in an oven, set it at 105°C to bake for more than 8 hours, and put it in a desiccator for later use.

[0038] Other tools: analytical balance (accuracy 0.0001g, weighing filter paper), electronic balance (accuracy 0.01g, weighing soil sample), tweezers, electrical tape, tinfoil, wax, brush, sterile gloves, scissors.

[0039] There should be at le...

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Abstract

The invention discloses an unsaturated soil matrix suction filter paper method measurement device and method. The unsaturated soil matrix suction filter paper method measurement device and method is an improvement on the basis of ASTM (American Society for Testing Material) by taking unsaturated loess for example from the four aspects of sealing conditions, weighing manners, weighing speed and balance time. The unsaturated soil matrix suction filter paper method measurement device and method overcomes the shortcomings of the sealing conditions of original filter paper methods during experiments and provides a new experimental sealing device, namely, changes a sealing tank into a sealing experimental environment with tinfoil wrapping and wax sealing. Besides, the unsaturated soil matrix suction filter paper method measurement device and method achieves improvement of aspects of the weighing manners, the balance time and the like, verifies the weighing speed and provides a complete set of testing scheme. The unsaturated soil matrix suction filter paper method measurement device is reasonable in structural design, capable of meeting requirements on experimental principles and precision, rapid in experimental operation, small in errors, high in reliability and working efficiency, convenient to popularize and apply and applicable to providing a solid foundation for conveniently testing the soil-moisture characteristic curve of unsaturated soil.

Description

technical field [0001] The invention belongs to the field of unsaturated soil research, and in particular relates to a device and method for measuring unsaturated soil matrix suction by a filter paper method. Background technique [0002] The filter paper method originated in soil science. In 1937, Gardner applied this method to measure the matric suction in unsaturated soil. At present, the method of measuring the suction force of unsaturated soil matrix by filter paper method is not as mature as other measurement methods (pressure plate instrument, centrifuge, hygrometer). This method is based on the theory of thermodynamic equilibrium, that is, soil samples with different moisture contents and dry filter paper have different free energy differences in a closed environment, so water migration will occur. When the equilibrium is reached, the free energy difference between soil and filter paper Zero, moisture no longer migrates, and the soil-filter paper-steam equilibrium p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/02
CPCG01N5/025
Inventor 李萍晁建红李同录李华谢潇张中华李晓猛马路白健忠包健郑泓
Owner CHANGAN UNIV
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