The deterioration of rock material properties induced by seepage pressure is a serious danger to the stability of geotechnical engineering. The formation and propagation of microcracks is the primary cause of rock macro failure. This work proposes an damage-based analytical model to assess the impact of seepage pressure on the macro mechanical behaviors of rocks from the standpoint of micro fracture. A wing crack model serves as the foundation for the analytical model. This model has taken into account the impact of seepage pressure on the initiation and growth of wing cracks. The constitutive relation is constructed based on the equivalency connection of damage defined by strain and wing crack length. A comparison between the analytical results and the reported experimental data confirms the reasonableness of the analytical model. Investigations are conducted on the relationship between the macro mechanical behavior of rocks and micro fracture under various seepage pressures, confining pressures, and microscopic parameters. The findings demonstrate that the cracks growth is initially steady before becoming unstable. The growing process of wing cracks stops when they connect with one another, and friction between the crack surfaces takes over. The initiation and growth of wing cracks may be aided by the seepage pressure. As the wing crack propagates, the seepage pressure effect initially increases, then decreases, and eventually has practically no impact. The influence of seepage pressure on rock macro mechanical behavior is that with seepage pressure increasing, the initiation stress and peak stress decrease, but the residual stress is basically a constant. The rock micro fracture process is significantly influenced by confining pressures and microscopic factors, which in turn affect the macro mechanical behavior. The study’s findings offer a micro fracture foundation for comprehending how seepage pressure affects the macro mechanical behaviors of rocks.

中文翻译：

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基于损伤的微裂缝角度评价渗流压力对岩石宏力学行为影响的解析模型


渗流压力引起的岩石材料性能恶化对岩土工程的稳定性构成严重威胁。微裂纹的形成和扩展是岩石宏破坏的主要原因。本研究提出了一种基于损伤的分析模型，从微裂缝的角度评估渗流压力对岩石宏力学行为的影响。翼裂纹模型是分析模型的基础。该模型考虑了渗流压力对翼裂缝起始和增长的影响。本构关系是基于应变和翼裂纹长度定义的损伤的等效连接构建的。分析结果与报告的实验数据之间的比较证实了分析模型的合理性。研究了岩石在各种渗流压力、围压和微观参数下岩石的宏力学行为与微观断裂之间的关系。研究结果表明，裂纹增长最初是稳定的，然后变得不稳定。当机翼裂纹相互连接时，它们的增长过程就会停止，裂纹表面之间的摩擦会接管。翼裂纹的开始和增长可能受到渗流压力的帮助。随着机翼裂纹的传播，渗流压力效应最初增加，然后减小，最终几乎没有影响。渗流压力对岩石宏力学行为的影响是，随着渗流压力的增加，起爆应力和峰值应力减小，但残余应力基本为常数。 岩石微观断裂过程受围压和微观因素的显著影响，进而影响宏力学行为。该研究的结果为理解渗流压力如何影响岩石的宏力学行为提供了微观裂缝基础。