Abstract:The accurate determination of fracture toughness (KIc) in rock is of great significance to the study of rock fracture characteristics, the earthquake preparation process and the inversion of earthquake occurrence mechanism, especially for earthquakes induced by hydrocarbon extraction and shale gas mining. However, the effect of contact friction in the loading process on the test results of fracture toughness is rarely considered, and the tested KIc in previous studies is generally higher than the inherent KIc … Show more
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