单斜辉长岩在真实三轴扰动试验下的疲劳损伤演化行为和分部疲劳力学模型

IF 7 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL International Journal of Rock Mechanics and Mining Sciences Pub Date : 2024-08-23 DOI:10.1016/j.ijrmms.2024.105881
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引用次数: 0

摘要

挖掘或爆破地下围岩时产生的扰动波会引起岩石的疲劳降解效应,并最终导致灾害。然而,岩石在真实三轴扰动下的疲劳破坏特征和疲劳模型却十分罕见。因此,我们进行了一系列真三轴扰动试验,以研究不同条件下岩石的疲劳变形、强度和损伤行为。分别研究了静态损伤和疲劳损伤的演变过程。岩石在真实三轴应力作用下的疲劳变形和损伤经历了三个阶段:衰减阶段、恒速阶段和加速阶段。裂纹起始应力可作为疲劳变形的初始条件;提出并探讨了岩石进入加速破坏阶段的疲劳临界应力σdc,随着频率的增加,σdc略有增加,随着σ2的增加,σdc明显增加。随后,提出了一种考虑岩石在真三轴扰动下的疲劳破坏和中间主应力效应的新型分数疲劳力学模型。模型的理论结果与试验结果吻合良好。最后,对应力和模型参数进行了敏感性分析,并对其他非试验条件下的模型进行了预测,以提高对地下工程疲劳破坏的认识和预测水平。
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Fatigue damage evolution behaviors and fractional fatigue mechanical model of monzogabbro under true triaxial disturbance test

The disturbance wave caused by excavation or blasting of underground surrounding rock causes fatigue degradation effect of rock and eventually leads to disasters. However, the fatigue damage characteristics and fatigue models of rock under true triaxial disturbance are scare. Therefore, a series of true triaxial disturbance tests were conducted to investigate the rock fatigue deformation, strength and damage behaviors under different conditions. The evolutions of static damage and fatigue damage are separated and investigated respectively. Fatigue deformation and damage of rock under true triaxial stress undergoes three stages: attenuation, constant velocity and acceleration stage. The crack initiation stress can be as the initial condition of the fatigue deformation; the fatigue critical stress σdc of rock entering the acceleration failure stage was proposed and explored, with increasing frequency, σdc increase slightly and with increasing σ2, σdc increase obviously. Then, a novel fractional fatigue mechanical model considering the fatigue damage and intermediate principal stress effects of rock under true triaxial disturbance was proposed. The theoretical results of the model agree well with the results of the tests. Finally, the sensitivity analysis of stresses and model parameters and the model predictions under other untesting conditions were carried out to improve the understanding and prediction level of fatigue failure in underground engineering.

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来源期刊
CiteScore
14.00
自引率
5.60%
发文量
196
审稿时长
18 weeks
期刊介绍: The International Journal of Rock Mechanics and Mining Sciences focuses on original research, new developments, site measurements, and case studies within the fields of rock mechanics and rock engineering. Serving as an international platform, it showcases high-quality papers addressing rock mechanics and the application of its principles and techniques in mining and civil engineering projects situated on or within rock masses. These projects encompass a wide range, including slopes, open-pit mines, quarries, shafts, tunnels, caverns, underground mines, metro systems, dams, hydro-electric stations, geothermal energy, petroleum engineering, and radioactive waste disposal. The journal welcomes submissions on various topics, with particular interest in theoretical advancements, analytical and numerical methods, rock testing, site investigation, and case studies.
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