Progressive failure characteristics and damage constitutive model of fissured rocks under water–rock coupling

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2024-11-20 DOI:10.1016/j.tafmec.2024.104765

Jiyuan Hu , Dongfa Sheng , Feifei Qin , Yingchao Zhu , Ziheng Li , Taicong Chen , Hongquan Yu

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Abstract

An in-depth study of the damage characteristics of rocks under water–rock coupling (WRC) and the weakening mechanism of their mechanical properties is of great guiding significance for practical engineering. This paper studies the influence of WRC on the mechanical properties, energy dissipation characteristics and damage evolution law of fractured limestone during long-term immersion damage, revealing the mechanical behavior of fractured rock mass in a water environment. To explore the influence of the nonlinear process of macroscopic and mesoscopic damage evolution on the mechanical behavior of fractured rock mass, based on the evolution law of dissipated energy of rock specimens, this paper proposes a critical point of pore compaction and constructs a strain difference function between the compaction stage and the linear elastic stage. On this basis, a segmented damage constitutive model consisting of an empirical pore compaction model and a macro-meso coupled damage constitutive model was established. The model was compared with the calculation results of the model that did not consider the pore compaction stage. It was found that the strength characteristics and damage evolution law of the fractured rock mass revealed by this model were more in line with the experimental results, thus verifying the rationality of the model. Finally, damage evolution and the physical significance of the model parameters proposed in this paper were systematically discussed.

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水岩耦合作用下裂隙岩的渐进破坏特征和损伤构成模型

深入研究岩石在水岩耦合（WRC）作用下的损伤特征及其力学性能的削弱机理，对实际工程具有重要的指导意义。本文研究了水岩耦合对断裂石灰岩长期浸泡破坏过程中力学性质、耗能特征和损伤演化规律的影响，揭示了断裂岩体在水环境中的力学行为。为探讨宏观和中观损伤演化的非线性过程对断裂岩体力学行为的影响，本文基于岩石试件耗能演化规律，提出了孔隙压实临界点，并构建了压实阶段与线弹性阶段的应变差函数。在此基础上，建立了由经验孔隙压实模型和宏观-介质耦合损伤构成模型组成的分段损伤构成模型。该模型与未考虑孔隙压实阶段的模型计算结果进行了比较。结果发现，该模型揭示的断裂岩体强度特征和损伤演化规律与实验结果更加吻合，从而验证了模型的合理性。最后，系统讨论了本文提出的模型参数的损伤演化和物理意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Theoretical and Applied Fracture Mechanics 工程技术-工程：机械

CiteScore

8.40

自引率

18.90%

发文量

435

审稿时长

37 days

期刊介绍： Theoretical and Applied Fracture Mechanics'' aims & scopes have been re-designed to cover both the theoretical, applied, and numerical aspects associated with those cracking related phenomena taking place, at a micro-, meso-, and macroscopic level, in materials/components/structures of any kind. The journal aims to cover the cracking/mechanical behaviour of materials/components/structures in those situations involving both time-independent and time-dependent system of external forces/moments (such as, for instance, quasi-static, impulsive, impact, blasting, creep, contact, and fatigue loading). Since, under the above circumstances, the mechanical behaviour of cracked materials/components/structures is also affected by the environmental conditions, the journal would consider also those theoretical/experimental research works investigating the effect of external variables such as, for instance, the effect of corrosive environments as well as of high/low-temperature.