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Method for testing content of unfrozen water in frozen earth

A test method, the technology of unfrozen water, applied in the direction of material moisture content, etc., can solve the problems of expensive equipment, large error of temperature measurement method, cumbersome operation and calculation of adiabatic measurement method, etc.

Active Publication Date: 2011-07-27
刘波 +1
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  • Application Information

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Problems solved by technology

The main problem of these methods is that the equipment is expensive, professional testers need to be trained, or the test time is too long, which is not equipped by ordinary laboratories.
The commonly used methods in the laboratory are thermometry and adiabatic measurement, but the error of thermometry is large, and the operation and calculation of adiabatic measurement are very cumbersome
[0004] Ordinary universities and laboratories are often difficult to spend huge sums of money to purchase expensive testing equipment and train professional testers

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  • Method for testing content of unfrozen water in frozen earth
  • Method for testing content of unfrozen water in frozen earth
  • Method for testing content of unfrozen water in frozen earth

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Embodiment Construction

[0023] The method of the present invention will be further described in detail below in conjunction with specific embodiments.

[0024] 1. Specific test steps of test data

[0025] (1) at first measure the quality of 5 soil-borrowing rings (earth-borrowers);

[0026] (2) Take 5 parts of the undisturbed soil body with the soil sampling ring, wrap it with plastic wrap, weigh it again, calculate the mass m of the soil sample, and number them 1-5 in sequence. For the convenience of experimental testing, the recommended specifications of cylindrical soil samples are diameter Φ = 31.8mm, height H = 47mm, such as figure 1 shown. The soil sample is Tianjin silt, and the specific gravity of soil particles G s =2.7, specific heat capacity C s = 0.826 kJ / (kg·K). Under normal circumstances, the volume of the test soil sample shall not be greater than 33.33cm 3 It is appropriate.

[0027] (3) Place a thermistor at the center of each test soil sample to test the center temperature of...

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Abstract

The invention provides a method for testing content of unfrozen water in frozen earth. The method is mainly applied to the testing on the content of unfrozen water in natural frozen earth and artificial frozen earth. The method comprises the steps of firstly processing the tested soil sample obtained in place according to the specified specification; subsequently freezing the tested soil sample to the low-temperature range of -30 to -15 DEG C; subsequently heating and melting the tested soil sample by natural convection under the room temperature air condition of 20 to 35 DEG C; recording thechange of the central temperature of the sample with the time; establishing a calculation model reflecting the temperature change process of the frozen earth according to a Newton cooling law; analyzing the convection heat transmission coefficient between air and soil; determining phase change time and phase change temperature so as to further calculate the content of unfrozen water under the frozen state; and finally calculating the characteristic curve of unfrozen water content during the melting process according to the test results. The method is simple and feasible and the testing resultis exact and reliable.

Description

technical field [0001] The invention relates to a method for testing the unfrozen water content of frozen soil, which is mainly used for testing the unfrozen water content of natural frozen soil and artificial frozen soil. Background technique [0002] The ground artificial freezing method is widely used in mine well construction projects and municipal engineering construction. The content of unfrozen water has an important impact on the engineering thermophysical and mechanical properties of frozen soil. The content of unfrozen water directly affects the strength of artificial frozen soil and the stability and safety of frozen engineering. Serious engineering accidents caused by artificial freezing engineering failure; the impact of unfrozen water content is a problem that must be studied and solved in frozen soil engineering. [0003] At present, the technical methods for testing the unfrozen water content of frozen soil mainly include nuclear magnetic resonance NMR metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/56
Inventor 刘波李东阳
Owner 刘波
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