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Steady-state measurement system and method for air guide rate of frozen soil

A measurement system and air conductivity technology, applied in the field of soil physics, can solve the problems of soil disturbance, difficult measuring cylinder, difficult application of devices, etc., and achieve the effect of easy operation, convenient use, management and maintenance, and low cost.

Inactive Publication Date: 2012-09-19
张振华
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention mainly solves the problem that the device for measuring the air conductivity of thawed soil is difficult to use due to the substantial increase in the strength of frozen soil, mainly because the measuring cylinder is difficult to drive in or the soil is greatly disturbed when it is driven in.

Method used

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  • Steady-state measurement system and method for air guide rate of frozen soil
  • Steady-state measurement system and method for air guide rate of frozen soil

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Embodiment 1

[0021] Example 1, see figure 1 , using hard plastic or metal measuring cylinder 1, the strength of the material should ensure that the cylinder does not deform during the test process, the measuring cylinder 1 is inserted into the soil to a certain depth, and is used to provide a certain gas storage space; the upper end of the measuring cylinder 1 uses a rubber stopper 2 Sealing, connect one end of the two connecting pipes 4 to the inside of the measuring cylinder 1 through the rubber stopper 2, and connect the other end to the air pressure gauge 5 and the gas supply source 3 respectively. A gas flowmeter 6 is installed on the tube 4, and the lower end of the measuring cylinder 1 is open but not closed; the gas supply source 3 is used to provide a stable air flow to the measuring cylinder 1, and the air pressure measuring gauge 5 is used to measure the gas pressure in the measuring cylinder 1, and the gas flowmeter 6 is used to measure the gas flow rate; form the steady-state ...

Embodiment 2

[0022] Embodiment 2, adopt the measurement system of embodiment 1 to carry out the measurement method of frozen soil air conductivity steady state, comprise the following steps: utilize soil drill to drill the borehole of certain depth L at the position to be measured, require borehole diameter and measuring cylinder The diameter D is consistent, apply a certain amount of Vaseline on the outside of the measuring cylinder to prevent air leakage between the outer wall of the measuring cylinder and the drill hole; use the air supply source to supply air to the measuring cylinder stably, when the pressure inside the measuring cylinder measured by the barometer and the flow rate measured by the gas flow meter When it is stable, stop the gas supply and record the stable pressure and flow values; under different gas supply intensities, obtain multiple sets of stable pressures and corresponding stable flow rates; take the stable flow rate as the dependent variable and the correspondi...

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Abstract

The invention discloses a steady-state measurement system and method for an air guide rate of frozen soil. The steady-state measurement system is characterized by comprising a measurement cylinder (1), an air supply source (3), an air pressure measuring meter (5) and an air flow meter (6). The air guide characteristic parameter S of the frozen soil is measured by using the steady-state measurement system provided by the invention and is substituted into a calculating formula given by the invention, so that the air guide rate of the frozen soil can be figured out. According to the invention, the measurement process of the air guide rate of the frozen soil is simplified and the measurement time and cost are saved. The steady-state measurement system can be realized technically, is greatly reduced in cost and is easy to popularize and apply.

Description

Technical field: [0001] The invention relates to the field of soil physics, in particular to a steady-state measurement system and a measurement method for air conductivity of frozen soil. Background technique: [0002] Air conductivity is one of the important characteristic parameters of soil, and it is an important characteristic index of soil. The condition of air conductivity is very important in the study of soil structure and structural stability. There is a close relationship between vegetation root growth and other factors. From the perspective of air supply, the methods for measuring soil air conductivity can be divided into two categories, one is the steady-state airflow measurement method, and the other is the transient airflow measurement method; from the perspective of measurement boundary conditions, the method of measuring soil air conductivity The method can be divided into one-dimensional measurement method and three-dimensional measurement method. One-dime...

Claims

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Application Information

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IPC IPC(8): G01N7/00
Inventor 张振华李陆生张富仓杨润亚潘英华
Owner 张振华
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