Method for obtaining mesoscopic degradation mechanism of Inan'an rock in freeze-thaw cycle process

Abstract

The invention provides a method for obtaining a mesoscopic degradation mechanism of Inan'an rock in a freeze-thaw cycle process, and relates to the technical field of freeze-thaw rock. Based on the microscopic change of rock damage expansion evolution, the development law of microscopic damage damage of rock in freeze-thaw cycle is obtained by a digital image numerical method, and the comprehensive damage law of freeze-thaw British-Ann rock under the action of freeze-thaw cycle load is obtained from the microscopic scale and the macroscopic scale. The method mainly comprises the following steps: establishing a finite element mesh model by using a microstructure image of an Inan'an rock slice; carrying out instantaneous cooling temperature field simulation, stress field freeze-thaw cycle simulation and displacement field freeze-thaw cycle simulation on the finite element mesh model; obtaining a plurality of temperature change distribution diagrams, a plurality of shear stress cloud diagrams, a plurality of tensile stress cloud diagrams and a plurality of displacement vector diagrams, and analyzing the plurality of temperature change distribution diagrams, the plurality of shear stress cloud diagrams, the plurality of tensile stress cloud diagrams and the plurality of displacement vector diagrams to obtain a mesoscopic degradation mechanism of the Inan'an rock slice in the freezing and thawing cycle process.

Description

technical field [0001] The present application relates to the field of freeze-thaw rock technology, in particular to a method for obtaining the mesoscopic deterioration mechanism of dacite during freeze-thaw cycles. Background technique [0002] The area of ​​various permafrost areas on the earth accounts for about 50% of the earth's land area, mainly distributed in the earth's poles and nearby areas and high-altitude areas. 75% of my country's land area is in the cold area, which belongs to permafrost and is frozen in winter. Summer thaw (freezing and thawing) periodic changes. [0003] Under the effect of freezing and thawing, the degradation of rocks in permafrost in cold regions has caused many geotechnical engineering problems: such as repeated freezing and thawing of foundations leading to uneven settlement of buildings, underground oil pipelines in alpine mountainous areas, and frost heaving and cracking of surrounding rocks in tunnels 1. Rock slopes are unstable due ...

AI Technical Summary

Problems solved by technology

Therefore, using the method of frozen soil mechanics to study freeze-thaw rocks leads to large discrepancies in the results

[0006] 2. Insufficient research on the mesoscopic frost heaving mechanism of rocks

[0007] 3. The numerical simulation of frozen soil and rock does not consider the mesoscopic structural characteristic

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