|
| Acoustic emission characteristics of mechanical properties of medium grained sandstone in deep mine |
|
Received:November 10, 2014
Revised:November 10, 2014
Accepted:November 13, 2014
Published Online:December 29, 2015
|
| View Full Text View/Add Comment Download reader |
| DOI： |
| KeyWord:medium grained sandstone; acoustic emission; counting rate; Kaiser point |
| Author | Institution |
| LIU Xing-hui |
Water Conservancy Institute Civll Colleges of Shandong Agriculture University |
| LIU Chuan-xiao |
Water Conservancy Institute Civll Colleges of Shandong Agriculture University |
| ZHUANG Shuai |
Water Conservancy Institute Civll Colleges of Shandong Agriculture University |
| ZHANG Xiao-lei |
Water Conservancy Institute Civll Colleges of Shandong Agriculture University |
|
| Hits: 2463 |
| Download times: 281 |
| Abstract: |
| By basic mechanical properties test of medium grained sandstone in deep mine, its basic mechanical properties parameters was obtained and by analysis of the AE signal, it was founded that counting rate level varies directly with stress relief(strain energy relief) level, which reaches the maximum with the happening of the main fracture of medium grained sandstone. According to the characteristic expression of medium grained sandstone AE signal, the signal before failure was divided in to three phases, namely A, B and C. Phase A, shaped as a peak, has a peak value about 300 times per second, corresponding to primary fracture pressure consolidation stage in the rock stress-strain relationship. Phase B is relative quiet, with a mean value about 100 times per second, mainly corresponding to elastic stage in the stress-strain relationship. Beginning from the appearance of high level AE signal to the happening of main fracture, the signal level in Phase C rises with time. The highest signal level before failure in Phase C can reach 600~700 times per second, mainly corresponding to plastic deformation stage in the stress-strain relationship. The position of kaiser point in the medium grained sandstone could be predicted and its corresponding stress value can be obtained through experimental data. Thus, the historical maximum pressure of rock, where the medium grained sandstone sample was taken from, can be predicted. |
| Close |
|
|
|