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Rock soil specimen ammonia gas saturated experiment method

An experimental method and ammonia gas technology, applied in the field of ammonia gas saturation experiment of rock and soil samples, can solve the problems of insaturation, difficulty in saturation and long time consumption of remodeling geotechnical samples, and achieve rapid and high-efficiency saturation. Effect

Active Publication Date: 2018-02-13
INST OF MECHANICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a kind of ammonia gas saturation experiment method of rock soil sample, can realize the fast and high-efficiency saturation of rock soil sample, provide high-quality saturated sample for rock soil triaxial experiment, solve the heavy problem in triaxial experiment The plastic rock soil sample cannot be saturated, it is difficult to saturate, and it takes a long time

Method used

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Examples

Experimental program
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Effect test

experiment example

[0031] Powder fine sand is used as the experimental medium, and the sample is tested according to the dry density of 1.6g / cm 3 , moisture content 8% for preparation. Carry out the above series of steps sequentially to complete the ammonia gas saturated sample, at this time the pores of the sample are filled with water. Afterwards, we use the pore pressure coefficient (B=Δu / Δσ, B is the pore pressure coefficient, Δσ is the increment of confining pressure, and Δu is the increment of pore pressure) to test the saturation of the sample. When the confining pressure is changed to 1MPa, the pore pressure A change of 1 MPa also occurred, and we obtained a pore pressure coefficient of 1.0, which has reached the experimental requirements.

[0032] From the experimental results, the pore pressure coefficient reached 1.0, indicating that the rock-soil sample was completely saturated. Since the samples can be prepared in batches, when conducting a series of experiments, we can prepare th...

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Abstract

The invention discloses a rock soil specimen ammonia gas saturation experiment method, which can realize fast high-efficiency saturation of rock soil specimens and comprises the following steps that adimidiate mold with the diameter being 1.0mm to 1.5mm greater than that of a standard specimen is developed; after the mold folding, a rubber membrane firstly sleeves inside the mold; sample soil bodies tamp the specimen in the mold in a layered way; then, the mold is put into a constant temperature box to be dried; after the specimen drying, the mold and the specimen are put into a sealed container to be vacuumized; then, sufficient ammonia gas is injected; before tri-axial experiment, the mold is put on a base of a tri-axial pressure chamber; the dimidiate mold is taken down; a pressure chamber cover is installed; confining pressure liquid is injected; confining pressure is loaded; the communicating vessel principle is used for performing water head saturation on the specimen; the waterhead difference is maintained to be 19.5cm to 20.6cm; when the water quantity for injecting the specimen is equal to the flowing-out water quantity, the continuous water head saturation is performedfor 30 to 40min; litmus blue test paper is used for sticking and coating flowing-out water until the test paper does not change the color, and the water head saturation stops.

Description

technical field [0001] The invention relates to an experimental method for ammonia gas saturation of a rock soil sample. Background technique [0002] Geotechnical triaxial experiment is a routine and widely used experiment in the field of geotechnical mechanics and engineering. The preparation of the saturated remodeling sample is the first and key link to ensure the success of the experiment. A variety of rock and soil sample saturation methods have been proposed internationally and included in the rock and soil test specifications, including water head saturation method, vacuum saturation method, carbon dioxide saturation method, back pressure saturation method, etc., but there are still some insurmountable defects , such as low saturation, long time-consuming, low efficiency, and damage to the sample. Contents of the invention [0003] The purpose of the present invention is to provide a kind of ammonia gas saturation experiment method of rock soil sample, can realiz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/12G01N1/36
CPCG01N1/36G01N3/12G01N2001/366G01N2203/0048G01N2203/0256
Inventor 罗大双张旭辉鲁晓兵赵京刘乐乐刘昌岭
Owner INST OF MECHANICS - CHINESE ACAD OF SCI
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