A micro-pressure osmometer and testing method

A technology of permeameter and micro-pressure difference, which is applied in the field of permeameter, can solve the problems of difficult accurate measurement of flow rate and slow flow rate of low-permeability medium, and achieve the effect of avoiding errors

Inactive Publication Date: 2021-01-29
INST OF HYDROGEOLOGY & ENVIRONMENTAL GEOLOGY CHINESE ACAD OF GEOLOGICAL SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above problems, the technical problem to be solved by the present invention is to provide a micro-pressure osmometer and a testing method that can solve the problems of slow water flow in low-osmotic media and difficulties in accurately measuring the flow rate.

Method used

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  • A micro-pressure osmometer and testing method
  • A micro-pressure osmometer and testing method
  • A micro-pressure osmometer and testing method

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preparation example Construction

[0018]Step 1. Preparation of the sample. If it is the original soil, use a utility knife to trim it into a cylindrical soil sample slightly higher than the ring knife, then press the special ring knife 201 into the soil sample, flatten the top with the utility knife, and cover it. Funnel type sand core 202; then turn the soil sample together with the funnel type sand core 202 vertically over 180 degrees, continue to flatten the other side of the ring knife with a utility knife, cover with another funnel type sand core 202, and finally fix the funnel with two duckbill clips If there is remolded soil around the sand core 202, first place the special ring cutter 201 on the funnel-shaped sand core 202, fill the remolded soil to the upper mouth of the special ring cutter 201, and cover with another funnel-shaped sand core 202. Finally, fix the funnel-shaped sand core around with duckbill clips;

[0019]Step 2. The sample is saturated with water, and a certain amount of liquid is injected in...

Embodiment

[0033]Example: The testing process of undisturbed soil and remolded soil is exactly the same, but the sample preparation process is slightly different. The following uses the test data of a certain undisturbed soil to illustrate how to calculate the permeability coefficient and establish the mathematical equation. Prepare the sample according to step one; saturate the sample according to step two; adjust the water level at the inlet and outlet according to step 3. According to step four,figure 2 The flow rate set in the first experiment in 1.00E-08m3 / d Inject fluid. According to step 5, monitor the change in the value of the differential pressure meter, and after the value is stable, record the reading of the second micro differential pressure meter tofigure 2 (4.4Pa), according tofigure 2 Repeat steps 4 and 5 10 times for the flow rate set in, and record the pressure difference after each experiment stabilizes. After 10 experiments are completed, calculate the permeability coeffici...

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Abstract

The invention discloses a micro-pressure osmometer and a testing method, which relate to the technical field of osmometers; the water inlet module is composed of a micro-injection pump and a micro-injector, and is used to precisely control low-speed flow; the sample chamber is composed of a special ring knife and two The funnel-type sand core is used to place test samples. The pressure gradient monitoring module is composed of the first micro-pressure differential gauge and the second micro-pressure differential gauge for monitoring pressure changes. The outlet water level control module is mainly composed of a peristaltic pump, a filter cup and Composed of conical flasks, the test method is: Step 1, sample preparation; Step 2, sample saturation; Step 3, water level leveling; Step 4, fluid injection; Traditional thinking, to avoid errors in the process of flow measurement. The micro pressure difference meter is used to monitor the small pressure difference between the water inlet and the water outlet, and the permeability coefficient under the condition of extremely low pressure gradient can be measured. This permeameter is specially customized with a thin ring knife for placing soil samples to meet the needs of different media.

Description

Technical field:[0001]The invention relates to a micro-pressure osmometer and a testing method, belonging to the technical field of osmometers.Background technique:[0002]Permeameter is the most important method to test the permeability coefficient of porous media. Conventional permeameters mostly use water level control devices to control the water pressure at both ends of the sample. According to the flow rate monitored at the outlet end, Darcy's law is used to calculate the permeability coefficient. For cohesive soils with low permeability, because the flow rate is small under normal pressure, the permeability coefficient is often measured by increasing the pressure gradient.[0003]Due to the poor permeability of cohesive soil and other media, the pressure gradient controlled by the atmospheric osmometer is relatively small, the amount of water passing through the sample per unit time is very small, and there are external factors such as evaporation, it is generally difficult to ac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08
CPCG01N15/0826
Inventor 郝奇琛魏士禹张翼龙朱玉晨陆川
Owner INST OF HYDROGEOLOGY & ENVIRONMENTAL GEOLOGY CHINESE ACAD OF GEOLOGICAL SCI
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