Coupled thermo-mechanical constitutive damage model for sandstone

Pathiranagei, Savani Vidana; Gratchev, Ivan

doi:10.1016/j.jrmge.2022.02.010

Cited by 26 publications

(9 citation statements)

References 45 publications

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“…Gao et al [15] and Cao et al [16] systematically analyzed the hard brittle rock mass and explained the failure mode of hard brittle rock over time through the aging safety model of engineering rock mass based on the theoretical time model. Pathiranagei et al [17] established a statistical coupled TM constitutive model for sandstone based on Weibull distribution and Lemaitre''s strain equivalent principle. Jia et al [18] and Wang et al [19] revealed the relationship between stress concentration coefficient and principal stress by analyzing environmental characteristics and roadway fracture patterns, and analyzed the influence of parameters such as rotation Angle on rock mechanics design models.…”

Section: Introductionmentioning

confidence: 99%

A Data Mining Method for Constitutive Model of Hard Brittle Coal

Qiang Zhang

2024

jes

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Data mining is an effective way to solve various types of complex nonlinear problems. And the anisotropy of the mechanical characteristics of coal is a typical nonlinear problem. Hard coal seam are usually characterized by brittleness, which makes them difficult to be crushed efficiently. It is important to improve the efficiency of hard coal crushing by the brittleness characterization method of hard coal is clarified. So the constitutive model and damage mechanism of hard brittle coal was studied in this paper. Damage model of hard brittle coal based on Weibull distribution was established. The damage transition point concept was proposed based on the deformation stage characteristics of hard brittle coal. And effective damage intervals for hard brittle coals can be determined based on the damage transition point. Uniaxial compression experiments of hard brittle coal were simulated using EDEM. The characterization of the effect of discrete elemental eigenstructural parameters on the brittleness of coal was analyzed. And quantitative relationships between shear modulus and brittleness, brittleness and damage transition point were fitted by Matlab. A discrete elemental constitutive model for hard brittle coals was obtained. Finally, the correctness of discrete elemental constitutive model was verified by comparing uniaxial compression experiments with other specimens. The results of this paper were expected to provide a theoretical basis for the crushing technology of hard brittle coal. And the numerical theoretical basis for data mining of the intrinsic model of hard and brittle coal was provided.

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Section: Introductionmentioning

confidence: 99%

A Data Mining Method for Constitutive Model of Hard Brittle Coal

Qiang Zhang

2024

jes

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“…The integration of a constitutive model holds utmost importance in the framework of rock mechanics’ strength theory. Significant progress and achievements have been made in the theory of rock damage by researchers both domestically and internationally [ 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 ]. Rocks typically exhibit robust coupling properties as a result of the interplay between geological processes and intricate natural surroundings over extended periods.…”

Section: Introductionmentioning

confidence: 99%

Chemical Corrosion-Water-Confining Pressure Coupling Damage Constitutive Model of Rock Based on the SMP Strength Criterion

Chen,

Tong,

Chen

et al. 2023

Materials

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Aiming at the problem of chemical-mechanics-hydro (C-M-H) action encountered by rocks in underground engineering, chemical damage variables, water damage variables, and force damage variables are introduced to define the degree of degradation of rock materials. Stone is selected as the sample for acid corrosion treatment at pH 3, 4, and 7, and a chemical damage factor is defined that coupled the pH value and duration of exposure. Then based on the spatial mobilized plane (SMP) criterion and the Lemaitre strain equivalence hypothesis, this research develops a constitutive model considering rock chemical corrosion-water-confining pressure damage. The proposed damage constitutive model employs the extremum method to ascertain the two Weibull distribution parameters (m and F0) by theoretical derivation and exhibits satisfactory conformity between the theoretical and experimental curves. The damage constitutive model can be consistent in the stress–strain characteristics of the rock triaxial compression process, which verifies the rationality and reliability of the model parameters. The model effectively represents the mechanical properties and damage characteristics of rocks when subjected to the combined influence of water chemistry and confinement. The presented model contributes to a better understanding of tangible rock-engineered structures subjected to chemical corrosion in underwater environments.

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“…The mechanical properties of soft rock are subject to the influence of numerous factors, encompassing internal factors such as mineral composition, microstructure, (Zhou et al, 2021), and type of cementation (Jiang et al, 2014), as well as complex geological environment, such as ground stress, groundwater, and temperature (Lu et al, 2016;Pathiranagei and Gratchev, 2022). In soft rocks that are rich in clay minerals, the degree of deterioration due to moisture content is particularly significant because of the intense interaction between clay mineral particles and water (Cao et al, 2012;He et al, 2000;Zhou et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Deterioration Mechanism and Statistical Damage Constitutive Model of Red-Bed Soft Rock with Different Moisture Contents

Wang

Zhang

et al. 2023

Preprint

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The mechanical properties of red-bed soft rock, widely encountered in the Central Yunnan Water Diversion Project, deteriorate significantly upon contact with water, impacting the safety of the project. The objective of this paper is to investigate the effects of moisture content on the mechanical properties of red-bed soft rock by conducting triaxial compression tests under varying confining pressure. Degradation mechanisms associated with distinct moisture content levels are determined. Deformation and deterioration mechanisms are investigated from the mineral compositions using X-ray diffraction. Modification of the Drucker-Prager criterion is studied to incorporate the Lode parameter. Utilizing the Weibull distribution, this study establishes a statistical damage constitutive model for red-bed soft rock. The triaxial compression test results of red-bed soft rock are used for the purpose of model validation. It is demonstrated that there is a strong concurrence between the theoretical model and empirical findings, indicating its suitability for analyzing the mechanical behavior of red-bed soft rock under varying moisture content. Findings in this paper can provide valuable insights into the investigation of large deformation occurring in surrounding red-bed soft rocks within the context of Central Yunnan Water Diversion Project.

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Coupled thermo-mechanical constitutive damage model for sandstone

Cited by 26 publications

References 45 publications

A Data Mining Method for Constitutive Model of Hard Brittle Coal

A Data Mining Method for Constitutive Model of Hard Brittle Coal

Chemical Corrosion-Water-Confining Pressure Coupling Damage Constitutive Model of Rock Based on the SMP Strength Criterion

Deterioration Mechanism and Statistical Damage Constitutive Model of Red-Bed Soft Rock with Different Moisture Contents

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