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首页> 外文期刊>Journal Of The South African Institute Of Mining & Metallurgy >Progress of brittle microfracturing in crystalline rocks under cyclic loading conditions
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Progress of brittle microfracturing in crystalline rocks under cyclic loading conditions

机译：循环载荷条件下晶体岩石脆性微卷积的研究进展

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摘要

The stress at onset of yielding for the walls of deep underground excavations in hard rock is significantly less than the laboratory strength of intact rock samples. The wall stability is rather controlled by the microfracturing strength of the rock (i.e. crack propagation (CD) and initiation (CI) thresholds). Factors such as loading and unloading effect of excavation, glaciation, stress rotation in front of a tunnel face, etc. can contribute to the progressive damage of the rock, influencing the CI and CD thresholds and therefore contributing to the damage intensity around underground openings. The effect of stress rotation and stress fatigue on crack damage thresholds is systematically investigated in this paper through state-of-the-art laboratory testing and monitoring techniques in combination with advanced grain-based numerical modelling.
机译：屈服于硬岩体深层地下挖掘墙壁的屈服的应力显着小于完整岩石样品的实验室强度。 壁稳定性相当受岩石的微折衷强度（即裂纹繁殖（CD）和引发（CI）阈值）的控制。 挖掘，冰川，冰川面前的装载和卸载效果等因素可以有助于岩石的渐进损伤，影响CI和CD阈值，因此有助于地下开口周围的损坏强度。 通过最先进的实验室检测和监测技术与先进的基于谷物的数值建模，在本文中系统地研究了应力旋转和应力疲劳对裂纹损伤阈值的影响。

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