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

A technology of measurement system and measurement method, which is applied in the field of soil physics, can solve the problems of inappropriate equipment for melting soil air conductivity, soil disturbance, and difficulty in measuring cylinders, and achieve the effects of low cost, easy operation, and simple measurement process

Inactive Publication Date: 2012-09-19
张振华
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Problems solved by technology

[0005] The present invention mainly solves the problem that the existing device for measuring the air conductivity of thawed soil is not suitable for frozen soil, it is difficult to apply and the strength of frozen soil is greatly improved, mainly because the measuring cylinder is difficult to drive in or it is difficult to drive in. problems such as large disturbances caused by the soil

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

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Embodiment 1

[0022] Example 1, see figure 1 , using hard plastic or metal measuring cylinder 1, the strength of the material should ensure that the cylinder body does not deform during the test process, insert the measuring cylinder 1 into the soil to a certain depth, and use it to provide a certain gas storage space, and then use the upper end of the measuring cylinder 1 with The rubber stopper 2 is sealed, and one end of the two connecting pipes 4 is respectively connected to the inside of the measuring cylinder 1 through the rubber stopper 2, and the other end is respectively connected to the air pressure gauge 5 and the gas supply source 3, and the connection to the gas supply source 3 A valve 6 is arranged on the pipe 4, and the lower end of the measuring cylinder 1 is opened but not closed; the gas supply source 3 is used to provide gas to the measuring cylinder 1, and the air pressure measuring gauge 5 is used to measure the gas pressure in the measuring cylinder 1; Transient measur...

Embodiment 2

[0023] Embodiment 2, adopt the measurement system of embodiment 1 to carry out the measurement method of frozen soil air conductivity transient, the steps are as follows: utilize soil drill to drill the borehole of certain depth L at the position to be measured, require borehole diameter and measuring tube 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, when the pressure inside the measuring cylinder measured by the barometer reaches the predetermined value P( 0), stop the gas supply, and close the valve, the predetermined value P (0) is 20-100cmH 2 The pressure of O, that is, 1.96kPa-9.81kPa; stop the gas supply and start timing at the same time, and observe the change of the pressure of the measuring cylinder measured by the barometric gauge, and record the pressure ...

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Abstract

The invention discloses a transient state measurement system and method for an air guide rate of frozen soil. The transient state measurement system is characterized by being formed by connecting a measurement cylinder (1), an air supply source (3) and an air pressure measuring meter (5). The air guide characteristic parameter S of the frozen soil is measured by using the transient 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 transient 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 transient measurement system and method for the 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-dimensional is ma...

Claims

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Application Information

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IPC IPC(8): G01N7/10G01N15/08
Inventor 张振华杨润亚潘英华牛文全张富仓
Owner 张振华
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