Abstract：To elucidate the long-term shear strength of anchored jointed rock masses (AJRMs) under shear creep-impact conditions, shear creep-impact tests were performed under constant normal stiffness boundary conditions. The failure mechanisms associated with shear and normal creep disturbances in AJRMs were examined across various combinations of joint roughness coefficient (JRC) and impact energy (Q). Moreover, a method for determining long-term strength based on Weibull distribution evaluation was proposed, and a theoretical calculation formula for the long-term strength of AJRMs under impact disturbance was established. The results indicate that normal creep deformation undergoes a sequential process involving asperity climb-induced dilation, asperity damage, and asperity shearing-off, which subsequently accelerates shear creep deformation. The instantaneous shear strain induced by impact loading exhibits a “jump-recovery-accumulation” evolution pattern. Under impact disturbance, the shear steady-state creep-rate curves reveal two distinct evolutionary forms: the “gradual-increase” type and the “stable-sudden-rise” type. Utilizing the Weibull distribution evaluation method with a 50% failure probability, the quantified long-term strength values fall within the reasonable range established by the traditional isochronous stress-strain curve method, with a relative expected error of 5% to 10%. A comparison with the indirect long-term strength determination method validated the parameter selection and rationality of the theoretical calculation model. These findings provide theoretical guidance for long-term instability control and support structure design in deep anchored jointed rock masses.
周健华1，2，宋 洋1*，王贺平2，李 昂1，毛镜涵1. 恒定法向刚度边界下加锚节理岩体剪切蠕变–冲击长期强度研究[J]. 岩石力学与工程学报, 2026, 45(7): 2155-2172.
ZHOU Jianhua1, 2, SONG Yang1*, WANG Heping2, LI Ang1, MAO Jinghan1. Long-term strength of anchored jointed rock masses under shear creep-impact loading with constant normal stiffness boundary conditions. , 2026, 45(7): 2155-2172.
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