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Calculation method of unfrozen water content in saturated frozen rock

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

Active Publication Date: 2020-02-21
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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  • Calculation method of unfrozen water content in saturated frozen rock
  • Calculation method of unfrozen water content in saturated frozen rock
  • Calculation method of unfrozen water content in saturated frozen rock

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Embodiment Construction

[0052] 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.

[0053] see figure 1 , a method for calculating the unfrozen water content of saturated frozen rocks, comprising the following steps:

[0054] (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 calculation method of unfrozen water content in saturated frozen rock. The method comprises the steps of firstly obtaining porosity and T2 spectrogram of a rock sample by utilizing a nuclear magnetic resonance technology, calculating to obtain an analytical expression of a porosity cumulative distribution curve according to the relationship between the rock T2 spectrogramand pore size distribution; simultaneously establishing a mathematical model of the pore size and the phase transition temperature in the freezing process by using the analytical expression of the porosity cumulative distribution curve, thereby obtaining a calculation formula of the unfrozen water content in the saturated rock. Through the method disclosed by the invention, the unfrozen water content of the saturated rock at different temperatures can be calculated only by obtaining the porosity and the porosity cumulative distribution curve of the rock sample through the nuclear magnetic resonance technology. The method is suitable for calculating the unfrozen water content of a rock brittle material, and has the characteristics of being simple and convenient for calculation process, andvisual and reliable in calculation result.

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. During 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...

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Application Information

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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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