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A Calculation Method for Unfrozen Water Content of Saturated Frozen Rocks

A calculation method and technology of unfrozen water, applied in measuring devices, suspension and porous material analysis, instruments, etc., to achieve the effect of low operation difficulty, simple calculation method and intuitive calculation results

Active Publication Date: 2021-05-18
CENT SOUTH UNIV
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Problems solved by technology

[0003] The published unfrozen water content calculation models are mainly for frozen soil media. Considering the essential difference between rock and soil, these mathematical calculation models have certain limitations when applied to the unfrozen water content calculation in frozen rock.

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  • A Calculation Method for Unfrozen Water Content of Saturated Frozen Rocks
  • A Calculation Method for Unfrozen Water Content of Saturated Frozen Rocks

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Embodiment Construction

[0051] The technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings. Apparently the described embodiments are only preferred examples of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0052] see figure 1 , a method for calculating the unfrozen water content of saturated frozen rocks, comprising the following steps:

[0053] (1) Sandstone is selected as the rock sample, and the rock sample is processed into a cylinder with a height-to-diameter ratio of 2:1 (100mm×Φ50mm) according to the conventional rock mechanics test standards. What needs to be explained here is that the sandstone used as the rock sample is only for illustration, and the rock sample in the present invention can also...

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Abstract

The invention discloses a method for calculating the unfrozen water content of saturated frozen rocks. The method first uses nuclear magnetic resonance technology to obtain the porosity and T of the rock sample 2 Spectrogram, according to rock T 2 The relationship between the spectrum and pore size distribution can be calculated to obtain the analytical expression of the porosity cumulative distribution curve; the analytical expression of the pore cumulative distribution curve is combined with the mathematical model of the pore size and phase transition temperature in the freezing process, so as to obtain the saturated rock. Calculation formula for unfrozen water content. In this method, the unfrozen water content of saturated rock at different temperatures can be calculated only by obtaining the porosity and porosity cumulative distribution curve of the rock sample through nuclear magnetic resonance technology. This method is suitable for the calculation of unfrozen water content of rock-like brittle materials, and has the characteristics of simple and convenient calculation process, and intuitive and reliable calculation results.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, and in particular relates to a method for calculating the unfrozen water content of saturated frozen rocks. Background technique [0002] In the process of mining and geotechnical engineering construction in cold regions, the freeze-thaw cycle has an important impact on the degradation of rock mechanical properties, rock mass stability and geological disaster prevention. In a low temperature environment, the water in the rock pores undergoes a phase change, and the volume of the water expands by about 9% after freezing, thereby generating frost heave force, which in turn causes frost heave deformation and damage to the rock. In the freezing process, unfrozen water is the main source of liquid water migration, which has an important impact on the formation of ice, frost heaving force and the degree of deformation caused by it. It can be said that the unfrozen water content in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08G01N24/08
CPCG01N15/088G01N24/081
Inventor 李杰林周科平杨承业刘汉文
Owner CENT SOUTH UNIV
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