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Controlling behaviour of constitutive models for rocks using energy dissipations

INTERNATIONAL JOURNAL OF PLASTICITY 2025年 184卷

作者： Nguyen, Nhan T. Nguyen, Giang D. Karakus, Murat Bui, Ha H. Phan, Dat G. Univ Adelaide Sch Architecture & Civil Engn Adelaide SA 5005 Australia Univ Adelaide Sch Chem Engn Adelaide SA 5005 Australia Monash Univ Dept Civil Engn Clayton Vic 3800 Australia

The behaviour of rocks and other similar geomaterials is governed by different underling dissipative mechanisms that can be represented by damage and plastic strains in continuum constitutive modelling. The explicit links between these dissipative mechanisms and constitutive behaviour are established in this study in a generic thermodynamics-based framework. The key feature of this proposed framework and derived damage-plasticity models is the capability to control the constitutive behaviour through varying the contributions of different dissipative mechanisms to the total dissipation budget. Particularly, three fractions of the total dissipation budget related to damage, plastic volumetric and shear dissipations are introduced to control the constitutive behaviour through the evolution of damage variable and plastic strains, respectively. The examples provided show the performance and promising features of the proposed framework.

关键词： rocks Constitutive modelling Thermodynamics Dissipation Damage mechanics Plasticity theory

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A coupled hydro-mechanical field-enriched finite element method for simulating the hydraulic fracture process of rocks subjected to in situ stresses

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ACTA GEOTECHNICA 2025年第3期20卷 1315-1339页

作者： Han, Linyuan Zhou, Xiaoping Wuhan Univ Sch Civil Engn Wuhan 430072 Peoples R China Northeastern Univ Sch Resources & Civil Engn Shenyang 110819 Peoples R China

A coupled hydro-mechanical field-enriched finite element method (HM-FE-FEM) is developed for simulating the hydraulic fracture process of rocks subjected to in situ stresses. The staggered iterative scheme based on the Newton-Raphson iterative algorithm is utilized to address the coupled hydro-mechanical problems. The opening process of the hydraulic fracture and natural fracture subjected to in situ stresses can be reproduced by the proposed method. The accuracy of the proposed method is verified through stress intensity factor, fracture opening and experiment results. For coalescence patterns between hydraulic and natural fractures, the influences of horizontal stress difference and intersection angle are analyzed and discussed. Additionally, for coalescence patterns between hydraulic fracture and natural karst caves, the influences of cave location, cave radius and horizontal stress difference are investigated and discussed. The numerical results illustrate the effectiveness of HM-FE-FEM in handling the complex coalescence behaviors in the hydraulic fracture process of underground rock reservoirs with different defects. This study has a certain guiding significance for optimizing the fracturing operation parameters.

关键词： Coupled hydro-mechanical field-enriched finite element method Hydraulic fracture process Natural fracture Natural karst cave rocks

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Multimodal Data Fusion System for Accurate Identification of Impact Points on rocks in Mining Comminution Tasks

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PROCESSES 2025年第1期13卷

作者： Kern, John Bernal, Daniel Fernando Quintero Urrea, Claudio Univ Santiago Chile USACH Fac Engn Elect Engn Dept Estn Cent Ave Victor Jara 3519 Santiago 9170124 Chile

This study presents a multimodal data fusion system to identify and impact rocks in mining comminution tasks, specifically during the crushing stage. The system integrates information from various sensory modalities to enhance data accuracy, even under challenging environmental conditions such as dust and lighting variations. For the strategy selected in this study, 15 rock characteristics are extracted at neighborhood radii of 5 mm, 10 mm, 15 mm, 20 mm, and 25 mm to determine the suitable impact points. Through processes like the Ball-Pivoting Algorithm (BPA) and Poisson Surface Reconstruction techniques, the study achieves a detailed reconstruction of filtered points based on the selected characteristics. Unlike related studies focused on controlled conditions or limited analysis of specific rock shapes, this study examines all rock faces, ensuring the more accurate identification of impact points under adverse conditions. Results show that rock faces with the largest support areas are most suitable for receiving impacts, enhancing the efficiency and stability of the crushing process. This approach addresses the limitations of manual operations and provides a pathway for reducing operational costs and energy consumption. Furthermore, it establishes a robust foundation for future research to develop fully autonomous systems capable of maintaining reliable performance in extreme mining environments.

关键词： crushing data fusion mining comminution multimodal rocks

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Assessment of the mineral potential of rocks using intelligent data analysis technologies

Assessment of the mineral potential of rocks using intellige...

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International Symposium on INFOTEH-JAHORINA (INFOTEH)

作者： Yadviga Tynchenko Vadim Tynchenko Ksenia Degtyareva Ekaterina Kalmykova Svetlana Kukartseva Artificial Intelligence Technology Scientific and Education Center Bauman Moscow State Technical University Moscow Russia Department of Technological Machines and Equipment of Oil and Gas Complex School of Petroleum and Natural Gas Engineering Siberian Federal University Krasnoyarsk Russia Information-Control Systems Department Reshetnev Siberian State University of Science and Technology Krasnoyarsk Russia Department of Systems Analysis and Operations Research Reshetnev Siberian State University of Science and Technology Krasnoyarsk Russia Center for Continuing Education Bauman Moscow State Technical University Moscow Russia Department of Applied Informatics Moscow Timiryazev Agricultural Academy Moscow Russia

ISBN: (数字)9798331515799

ISBN: (纸本)9798331515805

This paper presents a study aimed at developing and evaluating a classification model for the mineral potential of geological layers using machine learning methods. The main goal was to create an algorithm capable of predicting the categories of mineral potential — low, medium and high — based on key geological characteristics such as ore content, density, depth, permeability and rock type. The results obtained demonstrated the overall accuracy of the model at 98%, with an almost ideal classification for the categories of medium and high mineral potential. The analysis of the significance of the features showed that the ore content and density have the greatest impact on the classification. The work also revealed certain difficulties in classifying low mineral potential, which is due to limited data or the intersection of characteristics between classes. These results highlight the importance of further research in feature selection and improving data balance. The findings demonstrate the effectiveness of using machine learning methods in geological research and their potential for automating mineral resource assessment processes. The developed methodology can be adapted to solve other problems in the field of geology, such as forecasting deposits and optimizing mining.

关键词： Accuracy Machine learning algorithms Ores Machine learning Predictive models rocks Minerals Permeability Decision trees Forecasting

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Stress-Dependent Reflection and Transmission of Elastic Waves in rocks With Elastic-Inelastic Deformations Under Confining, Uniaxial, and Pure Shear Prestresses

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IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING 2025年 63卷

作者： Yang, Haidi Fu, Li-Yun China Univ Petr East China Natl Key Lab Deep Oil & Gas Qingdao 266580 Peoples R China Pilot Natl Lab Marine Sci & Technol Qingdao Lab Marine Mineral Resources Qingdao 266071 Peoples R China

Insights into stress-dependent reflection and transmission (R/T) of elastic waves are crucial for geophysical applications involving stress-dependent and angle-dependent seismic data. Stress-induced deformations in rocks typically exhibit an elastic-inelastic progressive transformation due to stress accumulation, crack closure, and crack growth before mechanical failure. Based on the truncated Taylor expansion of strain-energy function for small prestress deformations, the classical theory of acoustoelasticity with second-order and third-order elastic constants (2oeCs and 3oeCs) is insufficient to handle inelastic deformations caused by the closure or opening of compliant microstructures. Referred to the statically deformed state, Fu and Fu (2017) formulate the Pade Piola-Kirchhoff stress equations of motion for wave-induced small dynamic fields superposed on severely deformed rocks under large-magnitude prestress. The resulting Pade acoustoelastic equations of motion describe wave propagation in rocks with elastic-inelastic deformations in terms of 2oeCs, 3oeCs, Pad & eacute;coefficients, and static stresses. The stress- and angle-dependent R/T of waves at the stressed interface with a large static bias remains largely unaddressed. First, we compare conventional and Pade acoustoelastic plane-wave analyses for P-wave and S-wave velocities. Theoretical predictions by Pade acoustoelasticity (PA) agree well with laboratory measurements made on Portland and Massilon sandstones under confining and uniaxial prestresses, respectively. We formulate the Pade acoustoelastic R/T coefficients at an interface between rocks with locally uniform elastic-inelastic deformations, assuming negligible boundary dislocations, which holds under moderate inelastic deformation but may not apply to large plastic flow. We examine three typical loading modes (confining, uniaxial, and pure shear), with each considering the incidence of upgoing and downgoing P-waves and S-waves. The relevant Kno

关键词： Stress Deformation rocks Strain Propagation Media Mathematical models Loading Reflection Anisotropic magnetoresistance Critical angles elastic-inelastic deformations energy partitions Pad & eacute acoustoelasticity (PA) stress-dependent reflection and transmission (R/T) coefficients

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Size effects in the uniaxial compressive properties of 3D printed models of rocks:an experimental investigation

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International Journal of Coal Science & Technology 2022年第6期9卷 1-12页

作者： Hao Wu Yang Ju Xin Han Zhangyu Ren Yue Sun Yanlong Zhang Tianyi Han School of Mechanics&Civil Engineering China University of Mining&Technology(Beijing)Beijing 100083China State Key Laboratory of Coal Resources and Safe Mining China University of Mining&Technology(Beijing)Beijing 100083China School of Emergency Management and Safety Engineering China University of Mining&Technology(Beijing)Beijing 100083China

Transparent physical models of real rocks fabricated using three-dimensional(3D)printing technology are used in photoelas-tic experiments to quantify the evolution of the internal stress and deformation fields of ***,they are rendered as an emerging powerful technique to quantitatively reveal the intrinsic mechanisms of rock *** mechanical behav-ior of natural rocks exhibits a significant size effect;however,limited research has been conducted on whether transparent physical models observe similar size *** this study,to make the transparent printed models accurately demonstrate the mechanical behavior of natural rocks and reveal the internal mechanism of the size effect in rock mechanical behavior,the size effect in 3D printed models of fractured and porous rocks under uniaxial compressive loading was *** cylindrical models with different sizes that contained different fractured and porous structures were printed using the fracture and porous characteristics extracted from natural coal and *** variation in uniaxial compres-sive strength and elastic modulus of fractured and porous models for increasing model sizes were obtained through uniaxial compression ***,the influence of internal discontinuous structural features,such as fractures and pores,on the size effect pertaining to the mechanical behavior of the model was analyzed and elaborated by comparing it with the mechanical properties of the continuous homogeneous model without fractures and *** findings provided support and reference to analyze the size effect of rock mechanical behavior and the effect of the internal discontinuous structure using 3D printed transparent models.

关键词： Size effect 3D printed model rocks Mechanical property Fractures Pores

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Hydrocarbon generation characteristics and exploration prospects of Proterozoic source rocks in China

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Science China Earth Sciences 2019年第6期62卷 909-934页

作者： Wenzhi ZHAO Xiaomei WANG Suyun HU Shuichang ZHANG Huajian WANG Shuwei GUAN Yuntao YE Rong REN Tongshan WANG Research Institute of Petroleum Exploration & Development PetroChina

A large number of primary oil and gas reservoirs have been discovered in Proterozoic strata all over the *** sequences are widely distributed in China, and the discovery of large Sinian-aged gas reservoirs in the Sichuan Basin and Mesoproterozoic liquid oil seepages in North China shows that attention should be paid to the exploration potential of Proterozoic strata. In this paper, the main controlling factors of Proterozoic source rocks are discussed. Principally, active atmospheric circulation and astronomical cycles may have driven intense upwelling and runoff to provide nutrients; oxygenated oceanic surface waters could have provided suitable environments for the organisms to thrive; volcanic activity and terrestrial weathering caused by continental break-up would have injected large amounts of nutrients into the ocean, leading to persistent blooms of marine organisms; and extensive anoxic deep waters may have created ideal conditions for the preservation of organic matter. Additionally, the appearance of eukaryotes resulted in diversified hydrocarbon parent material, which effectively improved the generation potential for oil and gas. Through the comparison of Formations across different cratons, seven sets of Proterozoic organic-rich source rocks have been recognized in China, which mainly developed during interglacial periods and are also comparable worldwide. The Hongshuizhuang and Xiamaling Formations in North China have already been identified previously as Mesoproterozoic source rocks. The early Proterozoic Changchengian System is highly promising as a potential source rock in the Ordos Basin. In the Upper Yangtze area, the Neoproterozoic Datangpo and Doushantuo Formations are extensively distributed, and represent the major source rocks for Sinian gas reservoirs in the Sichuan Basin. Moreover, the Nanhuan System may contain abundant shales with high organic matter contents in the Tarim Basin, although this possibility still needs to be veri

关键词： Proterozoic Source rocks Hydrocarbon generation characteristics Replacement field

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A universal direct tensile testing method for measuring the tensile strength of rocks

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International Journal of Mining Science and Technology 2024年第10期34卷 1443-1451页

作者： Yang Wu Jianfeng Liu Zhide Wu Junjie Liu Yonghui Zhao Huining Xu Jinbing Wei Wen Zhong State Key Laboratory of Hydraulic and Mountain River Engineering Sichuan UniversityChengdu 610065China College of Water Resource and Hydropower Sichuan UniversityChengdu 610065China CNPC Key Laboratory of Oil and Gas Underground Storage Engineering Langfang 065007China College of Resources and Environmental Engineering Jiangxi University of Science and TechnologyGanzhou 341000China

There is limited applicability to the current method for testing the direct tensile strength of rocks because it places stringent requirements on the testing *** work suggests a universal method based on the‘‘compression-to-tensiono idea in response to these *** applying pressure,this technique makes it possible to test the tensile strength of rocks directly with any conventional compression test *** was utilized as the test material in order to validate this suggested testing method,and the results showed what *** determining the true fracture area through digital reconstruction,an average calculated tensile strength of 5.97 MPa with a Cvof 0.04 was *** is a positive correlation between tensile strength and the joint roughness coefficient(JRC)of the failure *** aggregation mode of AE events with the loading process conforms to the damage characteristics of rock tensile *** direct tensile testing method proposed in this study not only has high universality but also produces test results with outstanding ***,factors influencing the results of the tensile test are pointed out,and recommendations for optimizing the suggested testing method are offered.

关键词： rocks Direct tensile strength Granite Acoustic emission JRC

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Transient-state instability analysis of dissolution-timescale reactive infiltration in fluid-saturated porous rocks: Purely mathematical approach

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Science China(Technological Sciences) 2020年第2期63卷 319-328页

作者： ZHAO ChongBin HOBBS Bruce ORD Alison Computational Geosciences Research Centre Central South UniversityChangsha 410083China Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Ministry of EducationCentral South UniversityChangsha 410083China School of Earth and Environment The University of Western AustraliaCrawleyWA 6009Australia

This paper deals with how the purely mathematical approach can be used to solve transient-state instability problems of dissolution-timescale reactive infiltration(DTRI) in fluid-saturated porous rocks. Three key steps involved in such an approach are:(1) to mathematically derive an analytical solution(known as the base solution or conventional solution) for a quasi-steady state problem of the dissolution timescale, which is viewed as a frozen state of the original transient-state instability problem;(2)to mathematically deduce a group of first-order perturbation partial-differential equations(PDEs) for the quasi-steady state problem;(3) to mathematically derive an analytical solution(known as the perturbation solution or unconventional solution) for this group of first-order perturbation PDEs. Because of difficulty in mathematically solving a transient-state instability problem of DTRI in general cases, only a special case, in which some nonlinear coupling between governing PDEs of the problem can be decoupled, is considered to illustrate these three key steps in this study. The related theoretical results demonstrated that the transient chemical dissolution front can become unstable in the DTRI system of large Zh numbers when the long wavelength perturbations are applied to the system. This new finding may lay the theoretical foundation for developing innovative technique to exploit shale gas resources in the deep Earth.

关键词： mathematical study dissolution timescale reactive infiltration instability chemical dissolution perturbation solution porous rocks

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A unified theory for sharp dissolution front propagation inchemical dissolution of fluid-saturated porous rocks

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Science China(Technological Sciences) 2019年第1期62卷 163-174页

作者： ZHAO ChongBin HOBBS Bruce ORD Alison Computational Geosciences Research Centre Central South University School of Earth and Environment The University of Western Australia

This paper presents a unified theory to deal with when, why and how a sharp acidization dissolution front(ADF), which is represented by the porosity distribution curve, can take place in an acidization dissolution system composed of fluid-saturated porous rocks. The theory contains the following main points:(1) A reaction rate of infinity alone can lead to a sharp ADF of the Stefan-type in the acidization dissolution system. This sharp front is unstable when permeability in the downstream region is smaller than that in the upstream region.(2) For a finite reaction rate, when the acid dissolution capacity number approaches zero,the ADF can have a sharp profile of the Stefan-type either on a much smaller time scale or on a much larger time scale than the dissolution time scale. In the former case, the ADF may become unstable on a much larger time scale than the transport time scale, while in the latter case, it may become unstable if the growth rate of a small perturbation is greater than zero.(3) On the dissolution time scale, even if both the reaction rate is finite and the acid dissolution capacity number approaches zero, the profile of an ADF may not be sharp because it is in a transient state. In this case, not only can an ADF change its profile with time, but also its morphology can grow if the growth rate of a small perturbation is greater than zero. Due to the involvement of both the change rate and the growth rate of the ADF profile, it is necessary to conduct a transient linear stability analysis for determining whether or not a time-dependent ADF is stable in the acidization dissolution system.

关键词： sharp dissolution front stationary/steady state transient state acid dissolution capacity acidization dissolution porous rocks

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