Abstract For stability analysis of ultra-deep shaft surrounding rock, based on the elastic-plastic constitutive model and Mohr-Column failure criterion, the disturbance stress reaction process of the shaft excavation was simulated by reducing the radial support stress at the excavation boundary of shaft. The reaction mechanism of the disturbance stress was described based on the evolution of disturbance stress and failure of shaft surrounding rock, and then the results of current study on the disturbance stress mechanism of shaft longitudinal section were summarized. As the shaft goes deeper, the instability type of the new main shaft surrounding rock was divided into three categories: the structure controlling instability type, the stress controlling instability type and the transformation type from structural controlling instability to stress controlling instability. At the same time, based on the reaction mechanism of disturbance stress caused by shaft excavation and utilizing various rock failure criteria, the longitudinal instability zone was divided for the new main shaft. The calculating results showed that the structural controlling instability of shaft surrounding rock was between 0 m and 387 m, the transformation zone from structural controlling instability to stress controlling instability was between 387 m and 654.7 m, and the stress controlling instability type appeared between 654.7 m to 1 527 m.
ZHAO Xingdong,LI Yangyang,ZHANG Shujing, et al. Analysis and application of disturbance stress reaction mechanism of surrounding rock during sinking ultra-deep shaft[J]. Hazard Control in Tunnelling and Underground Engineering,
2020, 2(4): 19-28.
