Discussion on determination method of characteristic stress of Jinping marble under confining pressure condition
Jinglong Li1, Bin Sui2
COMPUTER MODELLING & NEW TECHNOLOGIES 2014 18(4) 284-288
1School of Civil Engineering Shandong University, Jinan, Shandong Provence, China
2JianBang Co. LTD, China
The characteristic stress is coincident well with the internal crack propagation in brittle rock. The characteristic stress are separately called closure stress, cracking stress, damaging stress and peak stress according to the internal crack state in loading. The propagation and damage extent in brittle rock can be reflected. Limited by loading testing equipment, the characteristic stress in confining pressure condition cannot be determined in China. In order to confirm the stress, the strain curves under different confining pressure condition are used to analysis the problem. The results show that the closure stress, cracking stress and damaging stress can be accurately confirmed by this method. The characteristic stress relates to the confining pressure, and the relationship is approximately linear.