Study of Creep Constitutive Model for Rock Mass Anchored by Bolts

Abstract

In the study of high-stress deep-buried tunnels, the creep phenomenon of the surrounding rock significantly affects tunnel stability. To address this, this paper establishes a creep constitutive equation for rock masses anchored by bolts (RMAB). A comparison between numerical methods and theoretical solutions reveals a high degree of consistency between the two. The study shows that as the Ek value increases, the initial displacement of the surrounding rock grows significantly. However, once Ek reaches a certain level, the rate of displacement increase gradually decreases, and the system stabilizes. Additionally, as ηk increases, the displacement of the surrounding rock decreases significantly, enhancing the rock's energy dissipation capacity and effectively suppressing deformation. The findings of this research provide important theoretical support and reference for the design of bolted support systems in deep-buried tunnels, with practical engineering value.