A thermo-hydro-mechanical-chemical coupled phase field framework for modeling fractures in porous rocks: the dual-fracture model

IF 5.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Acta Geotechnica Pub Date : 2025-08-05 DOI:10.1007/s11440-025-02713-9

Rui Liu, Shuwei Zhou, Shikang Qin, Shanpeng Cao, Xiaoying Zhuang, Timon Rabczuk

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Abstract

A THMC coupled phase field framework for modeling fractures in porous rocks is proposed in this study. The framework introduces additionally the damage variable governed synergistically by the phase field and chemical field to account for dual-fracture mechanisms. Through this damage variable, full coupling of the temperature, hydraulic, mechanical, chemical, and phase fields is achieved. Implemented on the COMSOL Multiphysics platform, this multi-field coupling framework is solved by using a staggered iteration algorithm. The proposed framework was verified through fracture propagation induced by various factors. Furthermore, two-dimensional case studies are conducted to investigate the effects of acid concentration, heterogeneity, injection rate, specific surface area, and scale parameters on fracture morphology, fluid pressure distribution, temperature distribution, pressure evolution, and fracture propagation range. Numerical results demonstrate that the predictions of the proposed THMC coupled phase field model for fracture evolution and acid breakthrough consumption align with existing studies, while effectively characterizing the influence of sensitivity parameters.

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模拟多孔岩石裂缝的热-水-力-化学耦合相场框架：双裂缝模型

本文提出了一种模拟多孔岩石裂缝的THMC耦合相场框架。该框架还引入了由相场和化学场协同控制的损伤变量，以解释双断裂机制。通过这个损伤变量，实现了温度、液压、机械、化学和相场的完全耦合。该多场耦合框架在COMSOL Multiphysics平台上实现，采用交错迭代算法求解。通过各种因素诱导的断裂扩展验证了所提出的框架。通过二维实例研究，探讨了酸浓度、非均质性、注入速率、比表面积和尺度参数对裂缝形态、流体压力分布、温度分布、压力演化和裂缝扩展范围的影响。数值结果表明，提出的THMC耦合相场模型对裂缝演化和酸突破消耗的预测与已有研究一致，同时有效表征了敏感性参数的影响。

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来源期刊

Acta Geotechnica ENGINEERING, GEOLOGICAL-

CiteScore

9.90

自引率

17.50%

发文量

297

审稿时长

4 months

期刊介绍： Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering. The journal strives to report and archive progress in the field in a timely manner, presenting research papers, review articles, short notes and letters to the editors.