Method for calculating volume deformation of rock pores under freezing and thawing effects

A pore volume, freeze-thaw technology, applied in the field of geotechnical engineering, can solve the problem that the volume of water completely frozen in the rock pores is difficult to calculate, etc.

Active Publication Date: 2018-12-11
CENT SOUTH UNIV
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Problems solved by technology

This method overcomes the difficulty in calculating the volume of completely froze...

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  • Method for calculating volume deformation of rock pores under freezing and thawing effects
  • Method for calculating volume deformation of rock pores under freezing and thawing effects
  • Method for calculating volume deformation of rock pores under freezing and thawing effects

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[0028] 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.

[0029] see figure 1 , a method for calculating the deformation of rock pore volume under freeze-thaw action, comprising the following steps:

[0030] (1) Use a micrometer to measure the external dimensions of the rock sample (such as length, width, height, diameter, etc.), as shown in Table 1.

[0031]

[0032] According to the above parameters, the volume of the rock sample is calculated as:

[0033] (2) Carry out vacuum saturation treatment on the rock sample, the specific operation process is: ...

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Abstract

The invention discloses a method for calculating volume deformation of rock pores under freezing and thawing effects. The method comprises the following steps: firstly, testing the porosity of a rockby utilizing a low-field nuclear magnetic resonance testing technology, and calculating a total volume of the pores of the rock; then testing the tensile strength of the rock and the volume modulus ofice, so as to obtain the size of a frost heave force and the volume modulus of the ice under freezing and thawing temperature; establishing a calculation model of the volume deformation of the rock pores under the freezing and thawing effects according to volume changes of a phase change process of changing water in a single saturated pore into the ice under the action of low temperature; finally, substituting obtained parameters into the established calculation model, so as to obtain the pores deformation of the rock which is frozen for one time. According to the method disclosed by the invention, the problem in a traditional calculation method that the volume of the water, which is completely frozen, in the rock pores is difficult to calculate under the freezing and thawing effects is solved; pore volume and elastic-plastic volume ratios of a rock test sample before and after freezing and thawing can be calculated by utilizing the calculation method provided by the invention.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, and in particular relates to a method for calculating the volume deformation of rock pores under the action of freeze-thaw cycles. Background technique [0002] There are a large number of irregular and cross-scale pores inside rocks, which directly affect the macroscopic physical, mechanical and chemical properties of rocks. Rocks (soil) in cold regions are affected by freezing and thawing, and the process is accompanied by many mechanical, physical and chemical phenomena. In the process of repeated freeze-thaw cycles, the micro-defects inside the rock continue to evolve, forming macroscopic cracks, causing the deterioration of the mechanical properties of the rock (soil), which in turn leads to freeze-thaw weathering, spalling and landslides of rock slopes, roadbeds and buildings. Freeze-thaw disasters such as foundation frost heave uplift and thaw subsidence. Therefore, anal...

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Application Information

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IPC IPC(8): G01N15/08G01N24/08
Inventor 李杰林刘汉文周科平
Owner CENT SOUTH UNIV
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