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An Experimental Study of Excavation Damaged Zone in Anisotropic Rock

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Abstract:

When a tunnel or an underground structure is excavated in rock mass, rock disturbed or damaged zone (EDZ) is formed around the excavation due to the stress concentration resulting from stress redistribution. Recent studies on the rock EDZ revealed it’s important to structural stability around underground opening. In this study, the fracture and damage mechanisms of rock induced by the accumulation of microcracks were investigated by AE tests. The results of the experiments showed that tensile failure was the major microscopic failure mechanism of rock in excavation damaged and disturbed zone. The expression of the damage magnitudes in each AE source leads to accurate prediction of macroscopic failure mechanisms. In addition, the orientation of the macroscopic failure plane could be estimated by the orientational distribution of microcracks.

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Periodical:

Key Engineering Materials (Volumes 353-358)

Pages:

905-908

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.353-358.905

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Online since:

September 2007

Authors:

Shu Hong Wang, Heek Wang Lee, Xing Dong Zhao, Ahmad Bashir

Keywords:

Acoustic Emission (AE), Anisotropy, Excavation Disturbed Or Damaged Zone (EDZ), Inhomogeneity, Mechanical Behavior

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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