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首页> 外文期刊>Pure and Applied Geophysics >Fracture Toughness Measurements and Acoustic Emission Activity in Brittle Rocks
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Fracture Toughness Measurements and Acoustic Emission Activity in Brittle Rocks

机译：脆性岩石的断裂韧性测量和声发射活性

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摘要

Fracture toughness measurements under static loading conditions have been carried out in Barre and Lac du Bonnet granites. An advanced AE technique has been adopted to monitor real-time crack initiation and propagation around the principal crack in these tests to understand the processes of brittle failure under tension and related characteristics of the resulting fracture process zone. The anisotropy of Mode I fracture toughness has been investigated along specific directions. Microcrack density and orientation analysis from thin section studies have shown these characteristics to be the primary cause of the observed variation in fracture toughness, which is seen to vary between 1.14 MPa.(m)1/2 and 1.89 MPa.(m)1/2 in Barre granite. The latter value represents the case in which the crack is propagated at right angles to the main set of microcracks. The creation of a significant fracture process zone surrounding the propagating main crack has been confirmed. Real-time imaging of the fracture process and formation of fracture process zone by AE techniques yielded results in very good agreement with those obtained by direct optical analysis.
机译：在Barre和Lac du Bonnet花岗岩中进行了静态载荷条件下的断裂韧性测量。在这些测试中，已经采用了先进的声发射技术来实时监测裂纹的实时萌生和扩展，从而了解在拉伸作用下的脆性破坏过程以及断裂过程区域的相关特征。已沿特定方向研究了I型断裂韧度的各向异性。薄截面研究的微裂纹密度和取向分析表明，这些特征是观察到的断裂韧性变化的主要原因，据认为，断裂韧性在1.14 MPa。（m）1/2 和1.89 MPa之间变化。 m）1/2 在Barre花岗岩中。后一个值表示裂纹以直角扩展到主要微裂纹组的情况。已经确认在扩展的主裂纹周围形成了明显的断裂过程区。通过AE技术对断裂过程进行实时成像和形成断裂过程区域，其结果与直接光学分析获得的结果非常吻合。

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