Damage evolution model of sandstone under coupled chemical solution and freeze-thaw process

Li, Xinping; Qu, Dengxing; Luo, Yi; Ma, Ruiqiu; Xu, Kun; Wang, Gang

doi:10.1016/j.coldregions.2019.03.012

Cited by 46 publications

(12 citation statements)

References 32 publications

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“…A uniaxial compression test was carried out for the rock immersed in the chemical solution, the chemical damage mechanism was analyzed, and the damage constitutive model was established [4,34]. The damage evolution model of rock under the coupled chemical-freeze-thaw action is constructed [35,36]. In order to study the damage evolution law of prefabricated cracked red sandstone samples under uniaxial cyclic compression, physical tests were carried out.…”

Section: Introductionmentioning

confidence: 99%

Study on Damage Constitutive Model of Rock under Freeze-Thaw-Confining Pressure-Acid Erosion

Chen

Peng

et al. 2021

Applied Sciences

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Aiming at the acid-etched freeze-thaw rock for geotechnical engineering in cold regions, chemical damage variables, freeze-thaw damage variables, and force damage variables were introduced to define the degree of degradation of rock materials, the law of damage evolution, the total damage variable of acid-corroded rock under the coupling action of freeze-thaw and confining pressure was deduced. The continuous damage mechanics theory was adopted to derive the damage evolution equation and constitutive model of acid-eroded rock under the coupling action of freeze-thaw and confining pressure. The theoretical derivation method was used to obtain the required model parameter expressions. Finally, the model’s rationality and accuracy were verified by the triaxial compression test data of frozen-thawed rocks. Comparing the test curve’s peak point with the peak point of the model theoretical curve, the results show that the two are in suitable agreement. The damage constitutive model can better reflect the stress-strain peak characteristics of rock during triaxial compression, verifying the rationality and reliability of the model and the method for determining the model parameters. The model extends the damage model of rock under the coupling action of freeze-thaw and confining pressure in the chemical environment and further reveals the damage mechanism and failure law of acid-corroded rock under the coupling action of freeze-thaw and confining pressure.

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Section: Introductionmentioning

confidence: 99%

Study on Damage Constitutive Model of Rock under Freeze-Thaw-Confining Pressure-Acid Erosion

Chen

Peng

et al. 2021

Applied Sciences

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“…In addition to rock damage under loading (compression, tension and shear), the SDM has also been widely used in research of rock damage in the multiphysical environment [28][29][30][31][32]. The factors of porosity, temperature, or freezethaw cycles were introduced into the damage variables of SDM under the multiphysical conditions.…”

Section: Introductionmentioning

confidence: 99%

A Statistical Damage Constitutive Model of Anisotropic Rock: Development and Validation

et al. 2021

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The damage constitutive model is of great significance to research the stress-strain relationship and damage evolution of rock under loading in engineering. In order to investigate the effect of anisotropic characteristic on the stress-strain relationship and damage evolution, a statistical damage constitutive model of anisotropic rock under true triaxial condition was developed. In this study, the plane which existed perpendicular to the coordinate axis was extracted from representative volume element (RVE) of rock. The extracted plane was assumed to be composed of abundant mesoscopic elements whose failure strength satisfied the Weibull distribution. According to the number of failure elements on the plane in each direction under loading, the anisotropic damage variable was established based on the proposed concept of areal damage. A statistical damage constitutive model of anisotropic rock was developed by using strain equivalent hypothesis and generalized Hooke constitutive model. Subsequently, the parameters in the anisotropic damage constitutive model were determined by the method of total differential. Thus, the damage evolution of anisotropic rock under various stress conditions can be conveniently evaluated by the anisotropic damage model. The model was validated based on the tests of rocks under the stress conditions of conventional triaxial and true triaxial, respectively. Moreover, for the purpose of studying the influence of parameters on the model, sensitivity analyses of mechanical parameters and model parameters were carried out. The results of statistical damage constitutive clearly demonstrate the stress-strain and damage evolution of anisotropic rock under various stress conditions.

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“…Guo et al [7] further carry out a series of hydraulic fracturing experiments and find that etching wormholes induced by the rock-acid reaction would change the pore structure of carbonate rocks, and gelled acid enables to increase both the width and the roughness of main fracture surfaces. Based on freeze-thaw cycles tests on sandstone immersed in different chemical solutions, Li et al [8] define a pore evolution law of sandstone and find that the porosity alteration is the most obvious in the first ten freeze-thaw cycles. Huang et al [9] state that iron ions and magnesium ions provided by the dissolution of ankerite in the acid fluid can promote the formation of chlorite, which is likely to block the pore throats and thus decrease the rock permeability.…”

Section: Introductionmentioning

confidence: 99%

Evaluation Approach of Rock Brittleness Index for Fracturing Acidizing Based on Energy Evolution Theory and Damage Constitutive Relation

Jin

Wang

et al. 2021

Lithosphere

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Acidizing, as an essential approach for well stimulation of sandstone or carbonate reservoirs, greatly affects the brittleness of the rock mass. Therefore, it is of great significance to develop a scientific brittleness evaluation methodology for the acid-corroded rock. In this paper, firstly, a damage constitutive model considering the compression hardening process of the acid-corroded sandstone under uniaxial loading is established and verified. Then, the evolution formulae of the relevant mechanical and fitting parameters are derived, and the stress-strain curve of the sandstone subjected to acid corrosion with soaking time is predicted. Finally, a theoretical model for evaluating the brittleness index (BI) of the acid-corroded sandstone based on energy evolution theory and damage constitutive relation is proposed. Based on this model, the BI of the sandstone subjected to acid corrosion is calculated and analyzed, and the BI of the acid-corroded sandstone with the soaking time is predicted. Results show that the BI of the sandstone is negatively correlated with the soaking time, and the rate of descent of the BI decreases with the increment of the soaking time. In addition, the decline degree of the BI has a negative correlation with the pH value. On the other hand, the temperature (25°C, 50°C, and 75°C) has greater weakening effects on the BI compared with the impact of the pressure (5 MPa, 10 MPa, and 15 MPa). Besides, days 50 and 120 are two turning points where the decreasing rates of the BI change from rapid to slow and slow to almost constant, respectively. Furthermore, a coefficient (θ) is proposed to quantify the effect of the acid corrosion, and some suggestions are provided for the application of the acidizing treatment.

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Damage evolution model of sandstone under coupled chemical solution and freeze-thaw process

Cited by 46 publications

References 32 publications

Study on Damage Constitutive Model of Rock under Freeze-Thaw-Confining Pressure-Acid Erosion

Study on Damage Constitutive Model of Rock under Freeze-Thaw-Confining Pressure-Acid Erosion

A Statistical Damage Constitutive Model of Anisotropic Rock: Development and Validation

Evaluation Approach of Rock Brittleness Index for Fracturing Acidizing Based on Energy Evolution Theory and Damage Constitutive Relation

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