Quantitative Damage Assessment in KURT Granite by Acoustic Emission

This paper presents the quantitative damage assessment of granite taken from KAERI Underground Research Tunnel using acoustic emission (AE). The results determined showed the crack initiation and crack damage stress occurred at 48%, 72% of uniaxial compressive strength (UCS) and until the applied stress level was reached the crack damage stress, the damage degree was 0.06. When the applied stress exceeded 80%, 90% of UCS, the damage degree were 0.34, 0.06 and which were similar to those obtained from axial deformation modulus. The simply regression analysis was used to interpret the relationship of the two damage assessment techniques and the two were highly correlated (

[1]  Masayasu Ohtsu,et al.  Simplified moment tensor analysis and unified decomposition of acoustic emission source: Application to in situ hydrofracturing test , 1991 .

[2]  C. Scholz,et al.  Dilatancy in the fracture of crystalline rocks , 1966 .

[3]  J.G.M. van Mier,et al.  Temporal and spatial development of drying shrinkage cracking in cement-based materials , 2003 .

[4]  Gye-Chun Cho,et al.  Geological storage of high level nuclear waste , 2011 .

[5]  Hiroshi Morioka,et al.  Back-analysis of rock mass strength parameters using AE monitoring data , 2007 .

[6]  M. V. M. S. Rao,et al.  Analysis of b-value and improved b-value of acoustic emissions accompanying rock fracture , 2005 .

[7]  N. A. Chandler,et al.  The progressive fracture of Lac du Bonnet granite , 1994 .

[8]  P. Meredith,et al.  Microcrack formation and material softening in rock measured by monitoring acoustic emissions , 1993 .

[9]  K. E. Løland.  Continuous damage model for load-response estimation of concrete , 1980 .

[10]  Z. T. Bieniawski,et al.  Stability concept of brittle fracture propagation in rock , 1967 .

[11]  S. Kwon,et al.  An investigation of the excavation damaged zone at the KAERI underground research tunnel , 2009 .

[12]  S. Shah,et al.  Process zone and acoustic-emission measurements in concrete , 1988 .

[13]  B. Stimpson,et al.  Identifying crack initiation and propagation thresholds in brittle rock , 1998 .

[14]  Philip G. Meredith,et al.  A COMPARISON OF SEISMIC AND STRUCTURAL MEASUREMENTS OF SCALING EXPONENTS DURING TENSILE SUBCRITICAL CRACK-GROWTH , 1993 .

[15]  Pathegama Gamage Ranjith,et al.  A study of the effect of displacement rate and moisture content on the mechanical properties of concrete : Use of acoustic emission , 2008 .