Investigation into Energy Dissipation During Grouting Uplift

Abstract

Concrete covering damage is often caused by inadequate control of the grouting process. As such, in this work, a grouting nonlinear dynamic damage model was established to explore the concrete covering damage mechanism, which is crucial to the safety of dam grouting. Specifically, this study was designed to: (1) investigate the hysteresis energy dissipation and hysteresis damage mechanisms during the concrete covering’s dynamic response process and (2) assess the concrete covering’s nonlinear dynamic response and hysteresis energy dissipation under different grouting pressures, joint apertures, cement liquid viscosities, and grouting flows. The results show that the pulsation amplitude and cumulative hysteresis energy dissipation signifcantly affects the concrete covering damage rate, which quickly increases with damage energy dissipation rate in unstable grouting pressure.