کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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4681868 | 1348879 | 2013 | 7 صفحه PDF | دانلود رایگان |
This paper focuses on the formation mechanism of fractures induced by excavation of a gallery in soft sedimentary rocks in the Horonobe area of Japan. Detailed fracture mapping of the gallery indicates that the fractures consist of both pre-existing shear fractures and excavation damaged zone (EDZ) fractures. EDZ fractures correspond to weak planes associated with bedding planes or transgranular cracks. The EDZ fractures terminate against pre-existing shear fractures. Therefore, even for excavations in soft sedimentary rocks, formation of the EDZ fractures are controlled by pre-existing fractures and earlier weak planes.
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► Fractures can be divided into pre-existing shear fractures and EDZ fractures.
► EDZ fractures correspond to weak planes such as bedding planes or transgranular cracks.
► Even for excavations in soft rocks, formation of the EDZ fractures is controlled by weak planes.
Journal: Geoscience Frontiers - Volume 4, Issue 1, January 2013, Pages 105–111