Analysis of rock mass stability in tunnel and underground engineering based on yield approach index

作者：Zhou Hui^*; Zhang Chuan Qing; Feng Xia Ting; Ru Zhong Liang

来源：Chinese Journal of Rock Mechanics and Engineering, 2005, 24(17): 3083-3087.

• Mohr-Coulomb yield criterion
• Surrounding rock stability analysis
• Underground engineering
• Yield approach index (YAI)

In many cases, it is necessary to realize the importance of the stability discrepancy among the points which are all close to the yield state in the principal stresses space. So the YAI (yield approach index) concept is presented, which denotes the yield approach degree or the difference of the stability of some points in the Haigh-Westergaard space compared with the relative safe point; and the method and rule are provided for the choice of relative safe point. The whole analysis is limited in the frame of plastic theory. This concept allows the possibility of describing the stability state and the progressing transition between stability and instability state of each element or point. So evolution of the stability state of surrounding rock mass in the process of loading can be simulated. The yield approach function is derived out based on the Mohr-Coulomb yield criterion. Finally, a case study is presented to which YAI is applied.

• 出版日期2005
• 单位东北大学