Method for constructing long-term hard rock freezing-thawing damage deformation model

Abstract

The invention discloses a method for constructing a long-term hard rock freezing-thawing damage deformation model. The method comprises the steps of: performing a freezing-thawing cycle test in different freezing-thawing cycle times on a rock sample; obtaining the instantaneous freezing-thawing damage variable of the rock sample in different freezing-thawing cycle times by adopting a uniaxial compression test; obtaining the long-term freezing-thawing damage variable of the rock sample in different freezing-thawing cycle times by adopting a uniaxial creep test; constructing a hard rock rheological damage constitutive model, in which freezing-thawing is introduced, according to the hooke body, the Calvinosome, the nonlinear viscoplastic body, the molecular coulomite, the instantaneous freezing-thawing damage variable and the long-term freezing-thawing damage variable; and obtaining a special solution on the hard rock rheological damage constitutive model by adopting Laplace and Laplace inverse transformation, so that the long-term hard rock freezing-thawing damage deformation model is obtained.

Description

technical field [0001] The invention relates to the field of rock mechanical performance research, in particular to a method for constructing a long-term deformation model of hard rock freeze-thaw damage. Background technique [0002] Freeze-thaw hard rock rheological damage refers to the situation that hard rock suffers fatigue damage and rheological deformation under the condition of freeze-thaw cycle for a long time. Hard rock is a special material with complex composition and structure, and contains a large number of microcracks inside, which are the important factors that dominate the mechanical properties of rock mass. Hard rock in alpine regions will be subjected to freeze-thaw cycles, resulting in serious internal deterioration. Under the action of freeze-thaw cycles, micro-defects inside the hard rock will continue to breed, produce and expand, and then accelerate weathering, which is manifested as damage to the mechanical properties of the rock mass. When this mic...

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Problems solved by technology

[0003] At present, the long-term deformation of freeze-thaw hard rock can be quantitatively analyzed through indoor freeze-thaw rheological tests. However, due to the randomness of hard rock selection and experimental errors, the data dispersion is large, and the constructed equation cannot accurately infer hard rock. However, establishing a rheological constitutive model of hard rock freeze-thaw damage and fitting test data can further qualitatively and quantitatively predict the long-term deformation of hard rock. description, it can also reflect its internal damage mechanism

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