Pore Evolution Mechanism in Granite during Ultrasonic Vibration-Assisted Penetration by a Disc Cutter.

ABSTRACT: The high strength and abrasiveness of hard rock formations are major factors contributing to the slow progress and high costs in tunnel boring machine (TBM) construction. Ultrasonic vibration, by generating stress concentration and fatigue damage through ultrahigh-frequency cyclic impacts, can effectively weaken rock strength and is considered a promising auxiliary technology for TBM applications. This study used nuclear magnetic resonance (NMR) to comparatively analyze the evolution of microscopic damage in granite under composite loading (ultrasonic vibration + static load) versus single loading. The results demonstrate that high-frequency ultrasonic vibration within the composite loading mode induces the microreciprocating motion of mineral particles, which intensifies stress concentrat

SUBMITTER: Ma X 

PROVIDER: S-EPMC12631694 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature